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Groups > sci.electronics.design > #447309 > unrolled thread

NPN Device Recommendation?

Started byJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
First post2017-02-11 13:22 -0700
Last post2017-02-12 17:21 -0500
Articles 20 on this page of 23 — 8 participants

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Contents

  NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-11 13:22 -0700
    Re: NPN Device Recommendation? John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-11 12:44 -0800
    Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-11 13:44 -0700
      Re: NPN Device Recommendation? Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-02-11 23:06 +0100
        Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-11 15:08 -0700
        Re: NPN Device Recommendation? Winfield Hill <hill@rowland.harvard.edu> - 2017-02-12 06:41 -0800
          Re: NPN Device Recommendation? Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-02-12 18:33 +0100
            Re: NPN Device Recommendation? Winfield Hill <hill@rowland.harvard.edu> - 2017-02-12 10:34 -0800
              Re: NPN Device Recommendation? Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-02-12 19:55 +0100
    Re: NPN Device Recommendation? Robert Baer <robertbaer@localnet.com> - 2017-02-11 21:45 -0800
      Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 08:46 -0700
        Re: NPN Device Recommendation? Winfield Hill <hill@rowland.harvard.edu> - 2017-02-12 08:38 -0800
          Re: NPN Device Recommendation? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 22:59 -0500
            Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 09:48 -0700
              Re: NPN Device Recommendation? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 23:12 -0500
                Re: NPN Device Recommendation? John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-12 09:13 -0800
                Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 10:36 -0700
                Re: NPN Device Recommendation? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-12 11:54 -0600
                  Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 11:25 -0700
                    Re: NPN Device Recommendation? John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-12 10:54 -0800
                    Re: NPN Device Recommendation? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-12 18:01 -0600
                      Re: NPN Device Recommendation? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 17:16 -0700
      Re: NPN Device Recommendation? krw@notreal.com - 2017-02-12 17:21 -0500

Page 1 of 2  [1] 2  Next page →

#447309 — NPN Device Recommendation?

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-11 13:22 -0700
SubjectNPN Device Recommendation?
Message-ID<kdsu9c9jjhq2cbarrbqipmnkgi1dmv128u@4ax.com>
I need a discrete NPN, non-Darlington, capable of handling a few tens
of microseconds at 10A repetitive at 1ms intervals, average
dissipation will be around 150uW, surface mount.

Recommendations?

Thanks!
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

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#447311

FromJohn Larkin <jjlarkin@highlandtechnology.com>
Date2017-02-11 12:44 -0800
Message-ID<rrtu9chnk9un5ccua30bi2f2mn30vsn682@4ax.com>
In reply to#447309
On Sat, 11 Feb 2017 13:22:23 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>I need a discrete NPN, non-Darlington, capable of handling a few tens
>of microseconds at 10A repetitive at 1ms intervals, average
>dissipation will be around 150uW, surface mount.
>
>Recommendations?
>
>Thanks!
>		
>                                        ...Jim Thompson

Lotta base current. Why not use a mosfet?


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics

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#447312

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-11 13:44 -0700
Message-ID<6ttu9cdhaf14ho67ik1jdogb9lma0n4b7g@4ax.com>
In reply to#447309
On Sat, 11 Feb 2017 13:22:23 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>I need a discrete NPN, non-Darlington, capable of handling a few tens
>of microseconds at 10A repetitive at 1ms intervals, average
>dissipation will be around 150uW, surface mount.
>
>Recommendations?
>
>Thanks!
>		
>                                        ...Jim Thompson

10V Max Vce
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

[toc] | [prev] | [next] | [standalone]

#447318

FromGerhard Hoffmann <ghf@hoffmann-hochfrequenz.de>
Date2017-02-11 23:06 +0100
Message-ID<eg9g84F7mf8U1@mid.individual.net>
In reply to#447312
Am 11.02.2017 um 21:44 schrieb Jim Thompson:

>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>> of microseconds at 10A repetitive at 1ms intervals, average
>> dissipation will be around 150uW, surface mount.
>>
>> Recommendations?

> 10V Max Vce

FZT859TA  & friends by Zetex, now Diodes,Inc.

I currently use them as a cascode behind an array of IF3601/2.
Like.

regards, Gerhard

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#447319

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-11 15:08 -0700
Message-ID<8p2v9chlo5bu4e9jp298hckkac73p2p31l@4ax.com>
In reply to#447318
On Sat, 11 Feb 2017 23:06:52 +0100, Gerhard Hoffmann
<ghf@hoffmann-hochfrequenz.de> wrote:

>Am 11.02.2017 um 21:44 schrieb Jim Thompson:
>
>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>> of microseconds at 10A repetitive at 1ms intervals, average
>>> dissipation will be around 150uW, surface mount.
>>>
>>> Recommendations?
>
>> 10V Max Vce
>
>FZT859TA  & friends by Zetex, now Diodes,Inc.
>
>I currently use them as a cascode behind an array of IF3601/2.
>Like.
>
>regards, Gerhard

Thanks, Gerhard!
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

[toc] | [prev] | [next] | [standalone]

#447404

FromWinfield Hill <hill@rowland.harvard.edu>
Date2017-02-12 06:41 -0800
Message-ID<o7ps7801gk4@drn.newsguy.com>
In reply to#447318
Gerhard Hoffmann wrote...
>
> FZT859TA  & friends by Zetex, now Diodes,Inc.

 Was that FZT869 ?  I'm a big fan of the Zetex
 low R_CE(sat) transistors.  I also like the
 SOT-223 package, although I'm disappointed in
 their commonly-poor thermal resistance specs.

 The FZT851 is a good pulsing NPN, rated at 20A.
>
>I currently use them as a cascode behind an array of IF3601/2.
>Like.
>
>regards, Gerhard
>


-- 
 Thanks,
    - Win

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#447427

FromGerhard Hoffmann <ghf@hoffmann-hochfrequenz.de>
Date2017-02-12 18:33 +0100
Message-ID<egbkijFkj9jU1@mid.individual.net>
In reply to#447404
Am 12.02.2017 um 15:41 schrieb Winfield Hill:
> Gerhard Hoffmann wrote...
>>
>> FZT859TA  & friends by Zetex, now Diodes,Inc.
>
>  Was that FZT869 ?  I'm a big fan of the Zetex

Oh, yes! And I even opened the Altium Designer in a Windows
virtual machine to be sure... Probably serious depletion of coffee.


>  low R_CE(sat) transistors.  I also like the
>  SOT-223 package, although I'm disappointed in
>  their commonly-poor thermal resistance specs.

I prefer SOT-89, for size, power and RF reasons.

The lead frame of the sot-223 is really thin because
they have to bend it 4 times and the contact area to
the board is not under the chip, but as far outside as possible.

>> regards, Gerhard

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#447437

FromWinfield Hill <hill@rowland.harvard.edu>
Date2017-02-12 10:34 -0800
Message-ID<o7q9s402i79@drn.newsguy.com>
In reply to#447427
Gerhard Hoffmann wrote...
>
> I prefer SOT-89, for size, power and RF reasons.

 Yes, right, much better.  But not many dies
 one wants to use come in that package.


-- 
 Thanks,
    - Win

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#447441

FromGerhard Hoffmann <ghf@hoffmann-hochfrequenz.de>
Date2017-02-12 19:55 +0100
Message-ID<egbpcgFljgmU1@mid.individual.net>
In reply to#447437
Am 12.02.2017 um 19:34 schrieb Winfield Hill:
> Gerhard Hoffmann wrote...
>>
>> I prefer SOT-89, for size, power and RF reasons.
>
>  Yes, right, much better.  But not many dies
>  one wants to use come in that package.
>
>
It looks like Infineon are phasing out Sot-223.
My BFG196 transistors are gone.

But there are some new ones in sot-89 for
GHz medium power, including at least one that
has the emitter on the middle tab, not the collector.
Ideal for CE RF stages, no parasitics from cooling.

Just a moment,

< 
http://www.infineon.com/dgdl/Infineon-BFQ790-DS-v02_00-EN.pdf?fileId=5546d4624cb7f111014d237c2a8f54fc 
 >

Cheers, Gerhard

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#447377

FromRobert Baer <robertbaer@localnet.com>
Date2017-02-11 21:45 -0800
Message-ID<nESnA.2111$X9.1828@fx28.iad>
In reply to#447309
Jim Thompson wrote:
> I need a discrete NPN, non-Darlington, capable of handling a few tens
> of microseconds at 10A repetitive at 1ms intervals, average
> dissipation will be around 150uW, surface mount.
>
> Recommendations?
>
> Thanks!
> 		
>                                          ...Jim Thompson
    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.

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#447409

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-12 08:46 -0700
Message-ID<qq01acdf3mjd279ipnjorr59abri120fgf@4ax.com>
In reply to#447377
On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
<robertbaer@localnet.com> wrote:

>Jim Thompson wrote:
>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>> of microseconds at 10A repetitive at 1ms intervals, average
>> dissipation will be around 150uW, surface mount.
>>
>> Recommendations?
>>
>> Thanks!
>> 		
>>                                          ...Jim Thompson
>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.

10A PEAK ??
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

[toc] | [prev] | [next] | [standalone]

#447418

FromWinfield Hill <hill@rowland.harvard.edu>
Date2017-02-12 08:38 -0800
Message-ID<o7q31l0239g@drn.newsguy.com>
In reply to#447409
Jim Thompson wrote...
>
>On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
><robertbaer@localnet.com> wrote:
>
>>Jim Thompson wrote:
>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>> of microseconds at 10A repetitive at 1ms intervals, average
>>> dissipation will be around 150uW, surface mount.
>>>
>>> Recommendations?
>>>
>>> Thanks!
>>> 		
>>>                                          ...Jim Thompson
>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>
>10A PEAK ??

 Nahh.


-- 
 Thanks,
    - Win

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#447419

FromPhil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Date2017-02-10 22:59 -0500
Message-ID<iNCdnbzJ8vzqDD3FnZ2dnUU7-KednZ2d@supernews.com>
In reply to#447418
On 02/12/2017 11:38 AM, Winfield Hill wrote:
> Jim Thompson wrote...
>>
>> On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
>> <robertbaer@localnet.com> wrote:
>>
>>> Jim Thompson wrote:
>>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>>> of microseconds at 10A repetitive at 1ms intervals, average
>>>> dissipation will be around 150uW, surface mount.
>>>>
>>>> Recommendations?
>>>>
>>>> Thanks!
>>>> 		
>>>>                                          ...Jim Thompson
>>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>>
>> 10A PEAK ??
>
>  Nahh.
>
>

The specs don't make sense.  A few tens of microseconds at 1 ms 
intervals is a duty cycle of a few percent.  At 10 A you're going to be 
dissipating a few watts, so your average power is going to be a lot 
bigger than 150 uW.

Cheers

Phil Hobbs

-- 
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

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#447420

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-12 09:48 -0700
Message-ID<gd41acd1da2q25nrngr1gedrjo9ippa9he@4ax.com>
In reply to#447419
On Fri, 10 Feb 2017 22:59:48 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 02/12/2017 11:38 AM, Winfield Hill wrote:
>> Jim Thompson wrote...
>>>
>>> On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
>>> <robertbaer@localnet.com> wrote:
>>>
>>>> Jim Thompson wrote:
>>>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>>>> of microseconds at 10A repetitive at 1ms intervals, average
>>>>> dissipation will be around 150uW, surface mount.
>>>>>
>>>>> Recommendations?
>>>>>
>>>>> Thanks!
>>>>> 		
>>>>>                                          ...Jim Thompson
>>>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>>>
>>> 10A PEAK ??
>>
>>  Nahh.
>>
>>
>
>The specs don't make sense.  A few tens of microseconds at 1 ms 
>intervals is a duty cycle of a few percent.  At 10 A you're going to be 
>dissipating a few watts, so your average power is going to be a lot 
>bigger than 150 uW.
>
>Cheers
>
>Phil Hobbs

Naaah!  Dumping a small capacitor, starting from 4.2V
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

[toc] | [prev] | [next] | [standalone]

#447421

FromPhil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Date2017-02-10 23:12 -0500
Message-ID<o7q46i$oig$1@dont-email.me>
In reply to#447420
On 02/12/2017 11:48 AM, Jim Thompson wrote:
> On Fri, 10 Feb 2017 22:59:48 -0500, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> On 02/12/2017 11:38 AM, Winfield Hill wrote:
>>> Jim Thompson wrote...
>>>>
>>>> On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
>>>> <robertbaer@localnet.com> wrote:
>>>>
>>>>> Jim Thompson wrote:
>>>>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>>>>> of microseconds at 10A repetitive at 1ms intervals, average
>>>>>> dissipation will be around 150uW, surface mount.
>>>>>>
>>>>>> Recommendations?
>>>>>>
>>>>>> Thanks!
>>>>>> 		
>>>>>>                                          ...Jim Thompson
>>>>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>>>>
>>>> 10A PEAK ??
>>>
>>>  Nahh.
>>>
>>>
>>
>> The specs don't make sense.  A few tens of microseconds at 1 ms
>> intervals is a duty cycle of a few percent.  At 10 A you're going to be
>> dissipating a few watts, so your average power is going to be a lot
>> bigger than 150 uW.
>>
>> Cheers
>>
>> Phil Hobbs
>
> Naaah!  Dumping a small capacitor, starting from 4.2V
> 		
>                                         ...Jim Thompson
>


Okay, so you're vastly overestimating the pulse width.  Since you don't 
seem to care very much about that, why do you need such a high peak 
current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge 
in 1 us with only 7 mA.

Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.

Cheers


Phil Hobbs

-- 
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

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#447423

FromJohn Larkin <jjlarkin@highlandtechnology.com>
Date2017-02-12 09:13 -0800
Message-ID<6m51ac1d5fvdnhdrgokm4ful3asbvbmspl@4ax.com>
In reply to#447421
On Fri, 10 Feb 2017 23:12:43 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 02/12/2017 11:48 AM, Jim Thompson wrote:
>> On Fri, 10 Feb 2017 22:59:48 -0500, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> On 02/12/2017 11:38 AM, Winfield Hill wrote:
>>>> Jim Thompson wrote...
>>>>>
>>>>> On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
>>>>> <robertbaer@localnet.com> wrote:
>>>>>
>>>>>> Jim Thompson wrote:
>>>>>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>>>>>> of microseconds at 10A repetitive at 1ms intervals, average
>>>>>>> dissipation will be around 150uW, surface mount.
>>>>>>>
>>>>>>> Recommendations?
>>>>>>>
>>>>>>> Thanks!
>>>>>>> 		
>>>>>>>                                          ...Jim Thompson
>>>>>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>>>>>
>>>>> 10A PEAK ??
>>>>
>>>>  Nahh.
>>>>
>>>>
>>>
>>> The specs don't make sense.  A few tens of microseconds at 1 ms
>>> intervals is a duty cycle of a few percent.  At 10 A you're going to be
>>> dissipating a few watts, so your average power is going to be a lot
>>> bigger than 150 uW.
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> Naaah!  Dumping a small capacitor, starting from 4.2V
>> 		
>>                                         ...Jim Thompson
>>
>
>
>Okay, so you're vastly overestimating the pulse width.  Since you don't 
>seem to care very much about that, why do you need such a high peak 
>current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge 
>in 1 us with only 7 mA.
>
>Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.
>
>Cheers
>
>
>Phil Hobbs

A little bitty 3-cent mosfet would discharge that cap just fine. If
recharge linearity matters, a phemt would have much lower drain
capacitance change vs voltage.

There are tricks for making and resetting fast linear ramps, but
helping Jim doesn't seem to be a sensible activity.


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics

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#447428

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-12 10:36 -0700
Message-ID<q771ac9afinbimpknv55vcrj5gep5gca4r@4ax.com>
In reply to#447421
On Fri, 10 Feb 2017 23:12:43 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 02/12/2017 11:48 AM, Jim Thompson wrote:
>> On Fri, 10 Feb 2017 22:59:48 -0500, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> On 02/12/2017 11:38 AM, Winfield Hill wrote:
>>>> Jim Thompson wrote...
>>>>>
>>>>> On Sat, 11 Feb 2017 21:45:55 -0800, Robert Baer
>>>>> <robertbaer@localnet.com> wrote:
>>>>>
>>>>>> Jim Thompson wrote:
>>>>>>> I need a discrete NPN, non-Darlington, capable of handling a few tens
>>>>>>> of microseconds at 10A repetitive at 1ms intervals, average
>>>>>>> dissipation will be around 150uW, surface mount.
>>>>>>>
>>>>>>> Recommendations?
>>>>>>>
>>>>>>> Thanks!
>>>>>>> 		
>>>>>>>                                          ...Jim Thompson
>>>>>>    EVERYBODY loves the 2N2222 foe everything, so...find a SMT version.
>>>>>
>>>>> 10A PEAK ??
>>>>
>>>>  Nahh.
>>>>
>>>>
>>>
>>> The specs don't make sense.  A few tens of microseconds at 1 ms
>>> intervals is a duty cycle of a few percent.  At 10 A you're going to be
>>> dissipating a few watts, so your average power is going to be a lot
>>> bigger than 150 uW.
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> Naaah!  Dumping a small capacitor, starting from 4.2V
>> 		
>>                                         ...Jim Thompson
>>
>
>
>Okay, so you're vastly overestimating the pulse width.  Since you don't 
>seem to care very much about that, why do you need such a high peak 
>current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge 
>in 1 us with only 7 mA.
>
>Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.
>
>Cheers
>
>
>Phil Hobbs

Not unlikely.  Can't say much.  Customer.
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

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#447431

From"Tim Williams" <tiwill@seventransistorlabs.com>
Date2017-02-12 11:54 -0600
Message-ID<o7q7bp$4r0$1@dont-email.me>
In reply to#447421
"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message 
news:o7q46i$oig$1@dont-email.me...
> Okay, so you're vastly overestimating the pulse width.  Since you don't 
> seem to care very much about that, why do you need such a high peak 
> current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge
> in 1 us with only 7 mA.
>
> Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.

Not to mention the < 0.42 ohm impedance, demanding a loop inductance under 
0.3nH.

This isn't monolithic, Jim ;-)

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com

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#447436

FromJim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date2017-02-12 11:25 -0700
Message-ID<84a1ac5kjju2si6em84lmr0qjc4eq4ech3@4ax.com>
In reply to#447431
On Sun, 12 Feb 2017 11:54:02 -0600, "Tim Williams"
<tiwill@seventransistorlabs.com> wrote:

>"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message 
>news:o7q46i$oig$1@dont-email.me...
>> Okay, so you're vastly overestimating the pulse width.  Since you don't 
>> seem to care very much about that, why do you need such a high peak 
>> current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge
>> in 1 us with only 7 mA.
>>
>> Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.
>
>Not to mention the < 0.42 ohm impedance, demanding a loop inductance under 
>0.3nH.
>
>This isn't monolithic, Jim ;-)
>
>Tim

Isn't the whole world monolithic ?>:-}
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

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#447440

FromJohn Larkin <jjlarkin@highlandtechnology.com>
Date2017-02-12 10:54 -0800
Message-ID<5qb1ac14e7tp0ceufa7d30cqp9jacgh2ej@4ax.com>
In reply to#447436
On Sun, 12 Feb 2017 11:25:33 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>On Sun, 12 Feb 2017 11:54:02 -0600, "Tim Williams"
><tiwill@seventransistorlabs.com> wrote:
>
>>"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message 
>>news:o7q46i$oig$1@dont-email.me...
>>> Okay, so you're vastly overestimating the pulse width.  Since you don't 
>>> seem to care very much about that, why do you need such a high peak 
>>> current?  Your 150 nJ at 4.2V comes out to 1.7 nF, which would discharge
>>> in 1 us with only 7 mA.
>>>
>>> Getting up to 10 A would a pulse width of 700 ps.  Kind of unlikely.
>>
>>Not to mention the < 0.42 ohm impedance, demanding a loop inductance under 
>>0.3nH.
>>
>>This isn't monolithic, Jim ;-)
>>
>>Tim
>
>Isn't the whole world monolithic ?>:-}
>		
>                                        ...Jim Thompson

And encrypted.


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics

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