Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > sci.electronics.design > #447421
| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: NPN Device Recommendation? |
| Date | 2017-02-10 23:12 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <o7q46i$oig$1@dont-email.me> (permalink) |
| References | (1 earlier) <nESnA.2111$X9.1828@fx28.iad> <qq01acdf3mjd279ipnjorr59abri120fgf@4ax.com> <o7q31l0239g@drn.newsguy.com> <iNCdnbzJ8vzqDD3FnZ2dnUU7-KednZ2d@supernews.com> <gd41acd1da2q25nrngr1gedrjo9ippa9he@4ax.com> |
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
Back to sci.electronics.design | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
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
csiph-web