Ignition Transistor Replacement

[Leather]

Haven't had time to update Ignition FAQ lately.  But this email came to me recently might help those working on ignitor box.  



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I own a 90' Suzuki gs-1100R. Nice bike, except that recently the TCI
module went bad.

One of the transistors that drive the coil was shorted. So I couldn't
find a replacement anywhere, its code is D1071. This doesn't appear in
any replacement book I've searched(national, ECG (now NTE), Archer
(RCA)), nor on the web pages of these manufacturers.

I found that in your page you make a comment that this transistor
(D1071) was replaced succesfully with the BU806 and/or SK9431. I know
this is not the same ign. module than in a virago, but I decided to give
it a try.  Tried the NTE2315. To make a long story short, I'll just say
that it worked for less than 10 seconds. After this short time, the new
transistor blew again.

I was lucky enough to find a guy here that says he has new D1071's. In
any case, I was able to learn that there is another replacement, the
NTE2317, specifically designed for ignition modules, that according to
this guy does work in my bike's TCI.

See: http://www.nteinc.com/specs/2300to2399/NTE2317.html

This is a bigger chip, that will require some mods to the heat sink to
make it work. I don't know if it will handle the 10k+ rpms of the bike,
but I wish I had tried it.

At 12.000 rpms, my bike wasted spark coil setup are making 200 sparks
per second per coil. That is a spark every 5ms, not important when
compared to the longer fall time from the 2317: 15us.

I looked for your heavier-duty recomendation, the TIP142 (nte270). This
doesn't seem appropiate for ignition circuits. The nte2317 can handle
way more current (15amps continuous!), and can handle spikes of up to
500volts(almost a must in coil circuits).

It was nice to find your help page anyway!!!

Francisco

[mac_p300]

Just a general note for anybody that doesn't know about the numbering system for Japanese transistors. The correct code for a "D1071" would be "2SD1071". If he'd looked that up he would probably have found it.

Malcolm

[Dave T.]

Interesting e-mail, so I thought I'd jump in too. I found a match for the 2SD1071 in the Newark electronics catalog (www.newark.com). The Newark catalog part number is 37C8902  they say it's an IC for $3.63. Specifics are: Fuji Transitor TO-220AB 450V 6A 40W BCE.

I looked at my spare Ignitor box and the transistors in there are 1D2 ETD41 - 035 transistors. I can't make out the manufacturer, it is an "S" with a circle around it and a line through the "S" from top to bottom. I searched these numbers in Newark with no avail. Are they still manufactured? Or do you have to replace with a "similair" replacement?  ???