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'[EE] 2n3904 reverse bias current gain'
2006\06\02@135854 by Mike Hord

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Does anyone have an idea of what a typical reverse
bias current gain is in the 2N3904?  Google has thus
far been less than forthcoming.

Base current is in the 40 uA range, at this point.

Mike H.

2006\06\02@144511 by Spehro Pefhany

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At 12:58 PM 6/2/2006 -0500, you wrote:
>Does anyone have an idea of what a typical reverse
>bias current gain is in the 2N3904?  Google has thus
>far been less than forthcoming.
>
>Base current is in the 40 uA range, at this point.
>
>Mike H.

An EDN article says typical 0.25 at 40uA, so you'd get 10uA of emitter
current.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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2006\06\02@152748 by Mike Hord

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Whew.  Worse than I'd thought.  I had hoped it would at least be
greater than or equal to one!

Seems to be working out though; my fix was to replace a couple
of resistors with markedly larger values.

Mike H.

PS- This whole thing came about because a Maxim part went
poof and- wait for it- we couldn't find an adequate replacement.

On 6/2/06, Spehro Pefhany <.....speffKILLspamspam@spam@interlog.com> wrote:
{Quote hidden}

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