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Mail Archives: geda-user/2012/07/14/04:44:05

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Message-ID: <5001314B.3010403@estechnical.co.uk>
Date: Sat, 14 Jul 2012 09:43:55 +0100
From: Ed Simmons <ed AT estechnical DOT co DOT uk>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Help Identify MON Transistor??
References: <1342237267 DOT 98959 DOT YahooMailNeo AT web65902 DOT mail DOT ac4 DOT yahoo DOT com>
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On 14/07/12 04:41, Edward Comer wrote:
> This is a bit off-topic - but - I am reverse engineering a circuit 
> board so that I can make a new PCB with some changes. There are two 
> surface mounted transistors in SOT23 configuration. One that is marked 
> "t04" and using a multimeter, it tests out as an NPN transistor and I 
> found some documentation that states that a "t04" is a PMBS3904 which 
> is equivalent to a 2N3904. However, the markings of the second 
> transistor are a mystery to me (It is marked "MON") and it does not 
> test out as an NPN or PNP transistor. I suspect that it may be a 
> MOSFET. Does anyone have any info on this transistor???
Here's a link to a DIY curve tester....

http://www.techlib.com/electronics/curvetrace.html

This should give you very helpful info in your quest to reverse engineer!

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    <div class="moz-cite-prefix">On 14/07/12 04:41, Edward Comer wrote:<br>
    </div>
    <blockquote
      cite="mid:1342237267 DOT 98959 DOT YahooMailNeo AT web65902 DOT mail DOT ac4 DOT yahoo DOT com"
      type="cite">
      <div style="color:#000; background-color:#fff; font-family:arial,
        helvetica, sans-serif;font-size:12pt">
        <div><font face="arial, helvetica, sans-serif" size="3">This is
            a bit off-topic - but - I am reverse engineering a circuit
            board so that I can make a new PCB with some changes. There
            are two surface mounted transistors in&nbsp;</font><font
            face="arial, helvetica, sans-serif">SOT23 configuration</font><span
            style="font-size: 12pt; ">. One that is marked "t04" and
            using a multimeter, it tests out as an&nbsp;<span
              class="yiv1570670070yshortcuts yiv1570670070cs4-visible"
              id="yiv1570670070lw_1342234476_0" style="cursor: pointer;
              color: rgb(54, 99, 136); border-bottom-width: 2px;
              border-bottom-style: dotted; border-bottom-color: rgb(54,
              99, 136); "><span class="yshortcuts cs4-visible"
                id="lw_1342237169_0" style="cursor: pointer;
                border-bottom-width: 2px; border-bottom-style: dotted;
                border-bottom-color: rgb(54, 99, 136); ">NPN transistor</span></span>&nbsp;and
            I found some documentation that states that a "t04" is a&nbsp;</span><font
            face="arial, helvetica, sans-serif">PMBS3904 which is
            equivalent to a&nbsp;</font><font face="arial, helvetica,
            sans-serif">2N3904. However, the markings of the second
            transistor are a mystery to me (It is marked "MON") and it
            does not test out as an NPN or PNP transistor. I suspect
            that it may be a MOSFET. Does anyone have any info on this
            transistor???</font></div>
      </div>
    </blockquote>
    Here's a link to a DIY curve tester....<br>
    <br>
    <a class="moz-txt-link-freetext" href="http://www.techlib.com/electronics/curvetrace.html">http://www.techlib.com/electronics/curvetrace.html</a><br>
    <br>
    This should give you very helpful info in your quest to reverse
    engineer!<br>
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