# Replacing a transistor in a CCFL inverter circuit

I have a DC-to-AC inverter circuit that isn't working. It takes 12V DC input and is being used to power a CCFL. The circuit looks remarkably similar to the one labelled "Conventional CCFL inverter" on https://en.wikipedia.org/wiki/CCFL_inverter .

As far as I can tell with my limited electronics skills, the problem was in one of the transistors. I have unsoldered it OK, and measuring it with a multimeter, I'm seeing a short between two of the pins, which I assume isn't supposed to be the case. Before I removed the transistor, I was seeing a short across the two DC input pins, which I assume is due to the dodgy transistor.

So I need to source a replacement transistor, but I don't know enough about transistors to know what to look for. The dead transistor has written on it:

H.   A
3669
89(something)Z


Web searching for HA3669 I find http://www.hsmc.com.tw/pdf/HA3669.pdf which sounds like what I have.

Does anyone know an equivalent transistor that I can obtain easily in the UK, e.g. from a Maplin store, or online.