I have VN parts which are FETs.
  *
  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
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----- Original Message ----- 
From: "Roger Weichert" <rweicher@bigpond.net.au>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Sunday, January 04, 2009 5:34 AM
Subject: [EE] Help to ID digital 'transistor'


> Hi all,
>
> I have a fairly sophisticated board to repair which all works except for 
> the
> serial communications section.
>
> The tx pin from the micro, drives a Quad 2 I/P +ve OR gate (SN74HC32N) ...
> and the output of that drives a small transistor shaped device  ...  same
> shape and size as a BC547 eg.
>
> This device has the letters VN, then next line C300L, then last line 
> C952AE.
>
> I've spent ages looking for data to find a replacement, but so far no 
> luck.
>
> I have a known good board to compare but the device doesn't measure as a
> normal transistor  ...  so I suspect it's a digital transistor or 
> darlington
> or ???, but I need to be certain what it is.
>
> The 'emitter' connects to ground, the 'base' is driven by the OR gate and
> the 'collector' pulls the transmit line down to ground from it's 3.5v, 
> when
> triggered.
>
> Hoping someone will be able to identify this device for me please as there
> are further boards with the same symptons to be repaired  ...  and new
> boards are super expensive.
>
> Thanks for your time.
>
> Regards,   RDW
>
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