Newsgroups: comp.robotics
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From: strohm@mksol.dseg.ti.com (john r strohm)
Subject: Re: Help! Part ID for battery charger. (TRIAC?)
Message-ID: <1993Nov15.233011.16241@mksol.dseg.ti.com>
Organization: Texas Instruments, Inc
References: <1993Nov14.174328.11727@aio.jsc.nasa.gov> <CGJHCu.183u@ns1.nodak.edu> <1993Nov15.155334.18127@jupiter.sun.csd.unb.ca>
Distribution: usa
Date: Mon, 15 Nov 1993 23:30:11 GMT
Lines: 29

In article <1993Nov15.155334.18127@jupiter.sun.csd.unb.ca> caiafgal@atlas.cs.upei.ca (Iain A. F. Galloway) writes:
>I need help finding a part from a 6 Amp car battery recharger.
>I think the part is a TRIAC,(board is marked "TR1") but I'm
>not sure. It is a 3 lead package like a 7805 voltage regulator,
>mounted to a flat piece of aluminum for a heatsink. The left lead
>is connected to the 12V from the power supply, the center lead
>goes to some other discrete circuitry, the right lead goes to
>the connection for the battery. 
>
>It is marked as follows:
>Top: S1207BH
>bottom: TAG8816
>
>I can't seem to find it anywhere in my books.
>Anyone have any suggestions? What about just picking another
>generic TRIAC that can handle at least 6 Amps?

From your description of the circuit, that is probably an old-fashioned
bipolar power transistor, not a TRIAC.  A TRIAC is an AC device; this
is apparently in a DC circuit.  It SOUNDS like the main pass transistor.

From the marking, the first thing I would try is looking up a Japanese
transistor type 2SS1207BH, then variants on 2SS1207.  That kind of marking
is quite common for RF finals (e.g. 2SC1909 is usually marked "C1909").

This might be a power FET, but I kind of doubt it, in a battery charger.

Odds are you won't be able to find the exact transistor, but there should be
an ECG replacement available.
