This isn't going to be what you want to hear, but here is the story.
Bad news number 1. It is often the case that transistor manufacturers (Texas Instruments in your case) use proprietary codes to designate their products. They do this to be able to hide the actual part number when they produce a component for a single specific customer. The "ATOM" written on the transistor is the Texas Instruments code for a particular transistor used in this application. It is virtually impossible to be able to cross reference such parts to a commonly available replacement component without knowing an engineer from TI, or someone that has blazed the way and done this before.
Bad news number 2. Looking back in history on this board, there have been instances of people replacing the transistors in their igniters. I can't find a specific instance of someone replacing a transistor from YOUR specific igniter and date range application.
Now some good news. There is a thread discussing replacing components on the igniter board. Know that the thread is discussing a 98 Sprint Executive...the three cylinder close cousin to your much older three cylinder 93 900 Daytona (you sure you have a 93 and not a 92?)
http://www.triumphrat.net/t3-sport-t...g-igniter.html In the thread there is a picture of the newer igniter with somewhat low resolution picture of the transistors used. On those pictures is the code TIP152, which (good news) is a standard transistor code. A TIP152 is an NPN power darlington transistor. The datasheet for the device can be found numerous places, here is one.
http://www.datasheetarchive.com/pdf-...DSA-719805.pdf
Now here is the iffy part. I dont know with absolute certainty that your transistors cross over to TIP152's. I suspect they would as the application is the same. Do notice that the newer Sprint igniter has much smaller surface mount components, meaning there may have been some engineering improvements between the two igniters, which means the transistors may not have been TIP 152's back then when your igniter was made. The way I see it, your igniter is useless the way it is, so you have nothing to lose and everything to gain by trying a TIP 152 as a replacement. If you do decide to replace it, I might be inclined to try the one component replacement first as a test, and if it works, replace the other two so that all three are of the same type. This will will help balance the circuit current loads out properly.
The fact that you mentioned Maplins implies you are in the UK somewhere, so I cant tell you how available a TIP152 would be, but it is a common and old product, so that means the price should be reasonable. If you were here in the USA, it wouldn't cost more than a few dollars or so for one. A quick look at a large electronics supplier (
www.mouser.com) shows them to have 60 in stock at the price of 3.23 USD each.
Do give Maplins a chance to cross reference a TIP152 and they may have an equivalent device in stock there.
Best of luck on this one and do let everyone know how you make out. There is a large gap in information available about this kind of project on the forum.
Experiment Safe!
Igniter Fault (93) Daytona 900
. Does anyone know what it is and where I can buy a replacment from.
Surgery on Igniter
Mick
Sounds promising, Mick. Don't forget to seal the igniter box up with some liquid tape or similar if this sorts it.
Linear Mode
