From: Sean Breheny <shb7@cornell.edu>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sat, 29 Aug 2020 04:32:55 -0700
Subject: Re: [EE] Looking for higher-voltage version of 2N4401
Thread-Topic: [EE] Looking for higher-voltage version of 2N4401
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Hi Dwayne,

Are you planning on using these as saturated switches or linear devices?
Typically the current gain in linear operation (with Vce at least several
volts) only gets better with lower current. I think the effect you are
referring to (lower current gain at small currents) is only due to
base-collector junction leakage at low Vce (BC junction becoming forward
biased or close to it).

Sean


On Fri, Aug 28, 2020 at 7:14 PM Dwayne Reid <dwayner@planet.eon.net> wrote:

> Good day to all.
>
> I'm looking for an inexpensive jelly-bean transistor similar to
> 2n4401 but with minimum 60V rating.  Of particular importance is that
> the DC current gain exceed 200 with collector current of about 1 mA.
>
> I've been going through the many choices at Digikey but I'm finding
> that although many suitable transistors have decent gain at fairly
> high currents (100 mA and up), they have sucky gain at low currents
> (1mA or so).
>
> I'd prefer to stay with a North American part number (2Nxxxx) but
> would absolutely consider others.
>
> Prefer something fairly robust, similar to the 2N4401.  Decent
> current rating, in other words.
>
> Suggestions gratefully accepted!
>
> Many thanks!
>
> dwayne
>
> --
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> 780-489-3199 voice   780-487-6397 fax   888-489-3199 Toll Free
> www.trinity-electronics.com
> Custom Electronics Design and Manufacturing
>
> --
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