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Groups > sci.electronics.design > #450540 > unrolled thread
| Started by | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| First post | 2017-03-06 16:51 -0800 |
| Last post | 2017-03-11 21:04 -0500 |
| Articles | 16 on this page of 96 — 20 participants |
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RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 16:51 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:01 -0800
Re: RF bipolars RIP Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-03-07 03:19 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 18:25 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-06 19:03 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 19:11 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:40 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 07:28 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:31 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:44 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 10:17 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 08:08 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 09:30 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 09:33 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:44 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:53 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 10:59 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:06 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 11:16 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:11 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:30 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:47 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:55 -0800
Re: RF bipolars RIP Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-03-08 11:50 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:36 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:40 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:24 -0800
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-07 16:55 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:40 -0800
Re: RF bipolars RIP Piotr Wyderski <no@mail.com> - 2017-03-09 07:10 +0100
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-10 21:32 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 22:57 -0600
Re: RF bipolars RIP, grab em while you can Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 04:05 -0800
Re: RF bipolars RIP, grab em while you can pcdhobbs@gmail.com - 2017-03-09 04:44 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:50 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:09 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 14:34 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 15:40 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 20:41 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 13:08 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:14 -0600
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 16:17 -0500
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 23:09 -0600
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 21:34 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-08 14:24 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-08 13:10 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-09 14:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-09 22:10 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 11:50 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 17:27 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 12:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 19:01 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 15:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 21:42 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 17:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 23:38 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 17:38 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 10:23 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 03:30 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 12:50 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 10:49 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:55 +0000
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 11:45 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:50 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 08:58 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:52 -0500
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-10 18:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:47 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:56 +0000
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:02 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-10 13:28 -0500
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:35 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:05 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:33 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:40 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:44 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 10:19 +0200
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-08 04:30 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 15:38 +0200
Re: RF bipolars RIP Robert Baer <robertbaer@localnet.com> - 2017-03-09 23:50 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 05:39 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-10 07:15 -0800
Re: RF bipolars RIP "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> - 2017-03-07 21:55 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:10 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:43 -0800
Re: RF bipolars RIP Tim Wescott <tim@seemywebsite.really> - 2017-03-10 23:54 -0600
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 04:32 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:54 -0800
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 11:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:17 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 15:11 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 14:22 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 21:11 -0500
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 21:04 -0500
Page 5 of 5 — ← Prev page 1 2 3 4 [5]
| From | Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> |
|---|---|
| Date | 2017-03-08 15:38 +0200 |
| Message-ID | <m2a88vrirb.fsf@nospam.fi> |
| In reply to | #450772 |
Winfield Hill <hill@rowland.harvard.edu> writes: > Mikko OH2HVJ wrote... >> >> Has anyone tried thermally conductive potting to keep >> Tj down? We did some impressive tests for an Atex/ >> IECEx design, like dissipating 6.5W from TSSOP8. >> Silicone based compound was also easy to pry off, >> unlike epoxy-based one. > > What kind of thermally conductive epoxy did you use? We tried a few and ended up with Acc Silicones SE3000 due to ease of potting, price and good enough conductivity. Here's a picture of a board where the silicone has been pried off by hand: https://flic.kr/p/RwE7ka If I can get the current work in progress board drawn in time, I could do a test with SOT23 package, too. In the test we actually had the TSSOP8 on top of a pertinax vero board with 0.100" holes and no copper to make its life even worse than in real world with copper GND planes and stuff. -- mikko
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| From | Robert Baer <robertbaer@localnet.com> |
|---|---|
| Date | 2017-03-09 23:50 -0800 |
| Message-ID | <3VswA.6019$mB4.5384@fx25.iad> |
| In reply to | #450554 |
Winfield Hill wrote: > John Larkin wrote... >> >> Looks like NXP is discontinuing .. > > Lifetime buys in order. > > But..does that mean only 100, 10,000, or ten million? Hell to predict sales (product need) next year to 10 years from now....
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-10 05:39 -0800 |
| Message-ID | <fa2e7779-244f-4e30-bc11-d7ea116b8856@googlegroups.com> |
| In reply to | #451135 |
>> Lifetime buys in order. >> >> > But..does that mean only 100, 10,000, or ten million? > Hell to predict sales (product need) next year to 10 years from now.... Depends. If (as in much of my stuff) just a few magic parts deliver a big competitive advantage, a reel or two is an excellent investment. Cheers Phil Hobbs
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-10 07:15 -0800 |
| Message-ID | <vlg5cclfsqmbmppqh4m3vca8206qv8k9ub@4ax.com> |
| In reply to | #451135 |
On Thu, 09 Mar 2017 23:50:25 -0800, Robert Baer <robertbaer@localnet.com> wrote: >Winfield Hill wrote: >> John Larkin wrote... >>> >>> Looks like NXP is discontinuing .. >> >> Lifetime buys in order. >> >> > But..does that mean only 100, 10,000, or ten million? > Hell to predict sales (product need) next year to 10 years from now.... > We just bought 11,000 PNPs, enough for 1100 boxes. That will give me a few years to find another way to make this circuit. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> |
|---|---|
| Date | 2017-03-07 21:55 +0000 |
| Message-ID | <2Oqdnf0thOqisSLFnZ2dnUU7-WHNnZ2d@giganews.com> |
| In reply to | #450540 |
>"John Larkin" wrote in message >news:hf0sbcdr6q698nj4kf0o4afbch9i842oth@4ax.com... >Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >and BFG31 and such. Bummer. I just designed them in. >They have equivalent SOT23s that they rate for 600 milliwatts. >SIX HUNDRED MILLIWATTS! >Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. I am so glad I gave up discrete design for asic design over 20 years ago... -- Kevin Aylward http://www.anasoft.co.uk - SuperSpice http://www.kevinaylward.co.uk/ee/index.html
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-03-07 14:10 -0800 |
| Message-ID | <ei8pf6FthobU1@mid.individual.net> |
| In reply to | #450692 |
On 2017-03-07 13:55, Kevin Aylward wrote: >> "John Larkin" wrote in message >> news:hf0sbcdr6q698nj4kf0o4afbch9i842oth@4ax.com... > >> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >> and BFG31 and such. Bummer. I just designed them in. > >> They have equivalent SOT23s that they rate for 600 milliwatts. > >> SIX HUNDRED MILLIWATTS! > >> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. > > I am so glad I gave up discrete design for asic design over 20 years > ago... > Re-designs triggered by component obsolescence are part of the revenue stream for circuit design engineers. As long as it was not the caused by them or at least it's been a few decades. -- Regards, Joerg http://www.analogconsultants.com/
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 14:43 -0800 |
| Message-ID | <ladubctrqtsl72ob661rlh0blvpkscr9nd@4ax.com> |
| In reply to | #450692 |
On Tue, 7 Mar 2017 21:55:10 -0000, "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> wrote: >>"John Larkin" wrote in message >>news:hf0sbcdr6q698nj4kf0o4afbch9i842oth@4ax.com... > >>Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >>and BFG31 and such. Bummer. I just designed them in. > >>They have equivalent SOT23s that they rate for 600 milliwatts. > >>SIX HUNDRED MILLIWATTS! > >>Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. > >I am so glad I gave up discrete design for asic design over 20 years ago... I enjoy discrete design. I can hack a breadboard myself in an afternoon, or get a board in a week. And an iteration doesn't cost megabucks. The thing that I'm designing could maybe be done in an IC, but nobody does. Well, I think ADI does but it's not public. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | Tim Wescott <tim@seemywebsite.really> |
|---|---|
| Date | 2017-03-10 23:54 -0600 |
| Message-ID | <UKadnaGuxNWODF7FnZ2dnUU7-dGdnZ2d@giganews.com> |
| In reply to | #450540 |
On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: > Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 and > BFG31 and such. Bummer. I just designed them in. > > They have equivalent SOT23s that they rate for 600 milliwatts. > > SIX HUNDRED MILLIWATTS! > > Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. 600mW dissipation, or 600mW signal output in class C? At what temperature? Not that I'm, like, cynical about semiconductor companies and data sheet numbers... -- www.wescottdesign.com
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-11 04:32 -0800 |
| Message-ID | <e0bf4901-913b-431a-ad92-5bf9defd5a1f@googlegroups.com> |
| In reply to | #451276 |
>> They have equivalent SOT23s that they rate for 600 milliwatts. >> >> SIX HUNDRED MILLIWATTS! >> >> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >600mW dissipation, or 600mW signal output in class C? At what >temperature? >Not that I'm, like, cynical about semiconductor companies and data sheet >numbers.. Nah, it's just the normal thing...the macimum lead temperature is 125 degrees. (kelvin) Cheers Phil Hobbs
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-11 07:54 -0800 |
| Message-ID | <r878cctkgf60htm4mkfimd1qpuhpeli43m@4ax.com> |
| In reply to | #451276 |
On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott <tim@seemywebsite.really> wrote: >On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: > >> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 and >> BFG31 and such. Bummer. I just designed them in. >> >> They have equivalent SOT23s that they rate for 600 milliwatts. >> >> SIX HUNDRED MILLIWATTS! >> >> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. > >600mW dissipation, or 600mW signal output in class C? At what >temperature? > >Not that I'm, like, cynical about semiconductor companies and data sheet >numbers... The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts dissipation. I'm a little skeptical. IR started the trend to high power ratings with (often without) footnotes about insane lab cooling techniques, like immersion in boiling fluids. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | krw@notreal.com |
|---|---|
| Date | 2017-03-11 11:15 -0500 |
| Message-ID | <5j88cchnu5fama0h0co4o8macjhkq9ilu9@4ax.com> |
| In reply to | #451314 |
On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote: >On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott ><tim@seemywebsite.really> wrote: > >>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >> >>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 and >>> BFG31 and such. Bummer. I just designed them in. >>> >>> They have equivalent SOT23s that they rate for 600 milliwatts. >>> >>> SIX HUNDRED MILLIWATTS! >>> >>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >> >>600mW dissipation, or 600mW signal output in class C? At what >>temperature? >> >>Not that I'm, like, cynical about semiconductor companies and data sheet >>numbers... > >The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >dissipation. I'm a little skeptical. > >IR started the trend to high power ratings with (often without) >footnotes about insane lab cooling techniques, like immersion in >boiling fluids. No, they just state 25C. How you get there is "just engineering".
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-11 09:17 -0800 |
| Message-ID | <pgb8cc52jh8lj3r0oqtlj7jc2qcqf1tnuq@4ax.com> |
| In reply to | #451319 |
On Sat, 11 Mar 2017 11:15:17 -0500, krw@notreal.com wrote: >On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin ><jjlarkin@highlandtechnology.com> wrote: > >>On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott >><tim@seemywebsite.really> wrote: >> >>>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >>> >>>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 and >>>> BFG31 and such. Bummer. I just designed them in. >>>> >>>> They have equivalent SOT23s that they rate for 600 milliwatts. >>>> >>>> SIX HUNDRED MILLIWATTS! >>>> >>>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >>> >>>600mW dissipation, or 600mW signal output in class C? At what >>>temperature? >>> >>>Not that I'm, like, cynical about semiconductor companies and data sheet >>>numbers... >> >>The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >>dissipation. I'm a little skeptical. >> >>IR started the trend to high power ratings with (often without) >>footnotes about insane lab cooling techniques, like immersion in >>boiling fluids. > >No, they just state 25C. How you get there is "just engineering". The On part specifies "on a ceramic substrate" so they probably epoxied it to a block of cold BeO. I don't usually do that; I generally use PC boards. IR did specify some parts in boiling freon or something. That's how you can get the legs of a TO220 to stand 100 amps. http://www.mouser.com/ProductDetail/IXYS/IXTT500N04T2/?qs=sGAEpiMZZMshyDBzk1%2fWi6yMqRcPieXHI0zvYoRJ1lQ%3d 500 amps continuous DPAK. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | "tom" <tmiller11147@verizon.net> |
|---|---|
| Date | 2017-03-11 15:11 -0500 |
| Message-ID | <oa1lh5$k5c$1@dont-email.me> |
| In reply to | #451330 |
"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message news:pgb8cc52jh8lj3r0oqtlj7jc2qcqf1tnuq@4ax.com... > On Sat, 11 Mar 2017 11:15:17 -0500, krw@notreal.com wrote: > >>On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin >><jjlarkin@highlandtechnology.com> wrote: >> >>>On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott >>><tim@seemywebsite.really> wrote: >>> >>>>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >>>> >>>>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >>>>> and >>>>> BFG31 and such. Bummer. I just designed them in. >>>>> >>>>> They have equivalent SOT23s that they rate for 600 milliwatts. >>>>> >>>>> SIX HUNDRED MILLIWATTS! >>>>> >>>>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >>>> >>>>600mW dissipation, or 600mW signal output in class C? At what >>>>temperature? >>>> >>>>Not that I'm, like, cynical about semiconductor companies and data sheet >>>>numbers... >>> >>>The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >>>dissipation. I'm a little skeptical. >>> >>>IR started the trend to high power ratings with (often without) >>>footnotes about insane lab cooling techniques, like immersion in >>>boiling fluids. >> >>No, they just state 25C. How you get there is "just engineering". > > The On part specifies "on a ceramic substrate" so they probably > epoxied it to a block of cold BeO. I don't usually do that; I > generally use PC boards. > > IR did specify some parts in boiling freon or something. That's how > you can get the legs of a TO220 to stand 100 amps. > > > > http://www.mouser.com/ProductDetail/IXYS/IXTT500N04T2/?qs=sGAEpiMZZMshyDBzk1%2fWi6yMqRcPieXHI0zvYoRJ1lQ%3d > > > 500 amps continuous DPAK. > > > > -- > > John Larkin Highland Technology, Inc > > lunatic fringe electronics > And 1 kW package dissipation.
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-11 14:22 -0800 |
| Message-ID | <htt8ccdidrkqsqgdnvhcjj1m6kj09v5n3b@4ax.com> |
| In reply to | #451356 |
On Sat, 11 Mar 2017 15:11:50 -0500, "tom" <tmiller11147@verizon.net> wrote: > >"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message >news:pgb8cc52jh8lj3r0oqtlj7jc2qcqf1tnuq@4ax.com... >> On Sat, 11 Mar 2017 11:15:17 -0500, krw@notreal.com wrote: >> >>>On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin >>><jjlarkin@highlandtechnology.com> wrote: >>> >>>>On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott >>>><tim@seemywebsite.really> wrote: >>>> >>>>>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >>>>> >>>>>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >>>>>> and >>>>>> BFG31 and such. Bummer. I just designed them in. >>>>>> >>>>>> They have equivalent SOT23s that they rate for 600 milliwatts. >>>>>> >>>>>> SIX HUNDRED MILLIWATTS! >>>>>> >>>>>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >>>>> >>>>>600mW dissipation, or 600mW signal output in class C? At what >>>>>temperature? >>>>> >>>>>Not that I'm, like, cynical about semiconductor companies and data sheet >>>>>numbers... >>>> >>>>The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >>>>dissipation. I'm a little skeptical. >>>> >>>>IR started the trend to high power ratings with (often without) >>>>footnotes about insane lab cooling techniques, like immersion in >>>>boiling fluids. >>> >>>No, they just state 25C. How you get there is "just engineering". >> >> The On part specifies "on a ceramic substrate" so they probably >> epoxied it to a block of cold BeO. I don't usually do that; I >> generally use PC boards. >> >> IR did specify some parts in boiling freon or something. That's how >> you can get the legs of a TO220 to stand 100 amps. >> >> >> >> http://www.mouser.com/ProductDetail/IXYS/IXTT500N04T2/?qs=sGAEpiMZZMshyDBzk1%2fWi6yMqRcPieXHI0zvYoRJ1lQ%3d >> >> >> 500 amps continuous DPAK. >> >> >> >> -- >> >> John Larkin Highland Technology, Inc >> >> lunatic fringe electronics >> > >And 1 kW package dissipation. > > What a pack of lies. Specs like that are fairly useless. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | "tom" <tmiller11147@verizon.net> |
|---|---|
| Date | 2017-03-11 21:11 -0500 |
| Message-ID | <oa2ahl$ito$1@dont-email.me> |
| In reply to | #451377 |
"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message news:htt8ccdidrkqsqgdnvhcjj1m6kj09v5n3b@4ax.com... > On Sat, 11 Mar 2017 15:11:50 -0500, "tom" <tmiller11147@verizon.net> > wrote: > >> >>"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message >>news:pgb8cc52jh8lj3r0oqtlj7jc2qcqf1tnuq@4ax.com... >>> On Sat, 11 Mar 2017 11:15:17 -0500, krw@notreal.com wrote: >>> >>>>On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin >>>><jjlarkin@highlandtechnology.com> wrote: >>>> >>>>>On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott >>>>><tim@seemywebsite.really> wrote: >>>>> >>>>>>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >>>>>> >>>>>>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 >>>>>>> and >>>>>>> BFG31 and such. Bummer. I just designed them in. >>>>>>> >>>>>>> They have equivalent SOT23s that they rate for 600 milliwatts. >>>>>>> >>>>>>> SIX HUNDRED MILLIWATTS! >>>>>>> >>>>>>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >>>>>> >>>>>>600mW dissipation, or 600mW signal output in class C? At what >>>>>>temperature? >>>>>> >>>>>>Not that I'm, like, cynical about semiconductor companies and data >>>>>>sheet >>>>>>numbers... >>>>> >>>>>The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >>>>>dissipation. I'm a little skeptical. >>>>> >>>>>IR started the trend to high power ratings with (often without) >>>>>footnotes about insane lab cooling techniques, like immersion in >>>>>boiling fluids. >>>> >>>>No, they just state 25C. How you get there is "just engineering". >>> >>> The On part specifies "on a ceramic substrate" so they probably >>> epoxied it to a block of cold BeO. I don't usually do that; I >>> generally use PC boards. >>> >>> IR did specify some parts in boiling freon or something. That's how >>> you can get the legs of a TO220 to stand 100 amps. >>> >>> >>> >>> http://www.mouser.com/ProductDetail/IXYS/IXTT500N04T2/?qs=sGAEpiMZZMshyDBzk1%2fWi6yMqRcPieXHI0zvYoRJ1lQ%3d >>> >>> >>> 500 amps continuous DPAK. >>> >>> >>> >>> -- >>> >>> John Larkin Highland Technology, Inc >>> >>> lunatic fringe electronics >>> >> >>And 1 kW package dissipation. >> >> > > What a pack of lies. Specs like that are fairly useless. > > > > > -- > > John Larkin Highland Technology, Inc > > lunatic fringe electronics > I was almost looking for the April 1st date.
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| From | krw@notreal.com |
|---|---|
| Date | 2017-03-11 21:04 -0500 |
| Message-ID | <v3b9cc5hihpj1vrmd6jjsjucdqn8roobtl@4ax.com> |
| In reply to | #451330 |
On Sat, 11 Mar 2017 09:17:44 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote: >On Sat, 11 Mar 2017 11:15:17 -0500, krw@notreal.com wrote: > >>On Sat, 11 Mar 2017 07:54:50 -0800, John Larkin >><jjlarkin@highlandtechnology.com> wrote: >> >>>On Fri, 10 Mar 2017 23:54:27 -0600, Tim Wescott >>><tim@seemywebsite.really> wrote: >>> >>>>On Mon, 06 Mar 2017 16:51:43 -0800, John Larkin wrote: >>>> >>>>> Looks like NXP is discontinuing their SOT89 RF bipolars, like BFQ149 and >>>>> BFG31 and such. Bummer. I just designed them in. >>>>> >>>>> They have equivalent SOT23s that they rate for 600 milliwatts. >>>>> >>>>> SIX HUNDRED MILLIWATTS! >>>>> >>>>> Maybe I can get by with some OnSemi 600 MHz SOT89 parts. Kinda slow. >>>> >>>>600mW dissipation, or 600mW signal output in class C? At what >>>>temperature? >>>> >>>>Not that I'm, like, cynical about semiconductor companies and data sheet >>>>numbers... >>> >>>The Onsemi 50A02MH is an SC70/SOT323 that is rated for 600 milliwatts >>>dissipation. I'm a little skeptical. >>> >>>IR started the trend to high power ratings with (often without) >>>footnotes about insane lab cooling techniques, like immersion in >>>boiling fluids. >> >>No, they just state 25C. How you get there is "just engineering". > >The On part specifies "on a ceramic substrate" so they probably >epoxied it to a block of cold BeO. I don't usually do that; I >generally use PC boards. > >IR did specify some parts in boiling freon or something. That's how >you can get the legs of a TO220 to stand 100 amps. So you do know how to do it. What's the problem? ;-) > >http://www.mouser.com/ProductDetail/IXYS/IXTT500N04T2/?qs=sGAEpiMZZMshyDBzk1%2fWi6yMqRcPieXHI0zvYoRJ1lQ%3d > > >500 amps continuous DPAK.
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