More component substitutions (UK)

[dannybeckett]

Hi everyone.

I'm trying to get a parts list together on RS electronics for a complete megasquirt v3 board. Unfortunately some parts are not available. The parts in question are:

Q16 - VB921 Coil Driver
U4 - IXDI404PI FET Driver
L1,L2 - 70F106AI-RC Choke
Q22,Q23 - ZTX553 Transistor

I have read the forums and found that the FET driver U4 can be replaced with an MC34151P, so long as D21 is changed from a 36V zener to an 18V type, this is the route I am going to take.
I have found a replacement inductor, http://uk.rs-online.com/web/search/sear ... 0&x=40&y=8 . I think this will work fine, but a confirmation would be great.
Could Q22 and Q23 be replaced with this part, http://uk.rs-online.com/web/search/sear ... &x=13&y=20 ?
Aas for the coil driver, I know the BIP373 is a better replacement but I cannot find that either. Would this work... http://uk.rs-online.com/web/search/sear ... 64&x=9&y=4

Thanks in advance for your help,

Dan

[trakkies]

Have you tried Digi-Key? The MS site lists part numbers from them. They have a UK website and deliver to the UK just about as quickly as RS, even although most things seem to come from the US. ;-)

http://www.digikey.co.uk/

[trakkies]

Just to add that RS are a fine company - but pretty expensive for the small trader. CPC or Rapid are my first choice for the common stuff.

[dannybeckett]

Thanks for the reply, I have tried digikey but the cost of parts actually worked out to be more expensive than RS's did! Also, the BIP373 wasnt available from there. Ill have a look for the other parts on the other website you've mentioned though!

edit
Just had a check, no joy. Hopefully the parts i've chosen will be ok?

[DonTZ125]

The only people on the planet that I know of who sell BIP373 at the retail level are DIYAutoTune. The ISL9V5036P3 will work; just bear in mind it has no amp-clamp or thermal shutdown protection. Make sure your dwell isn't too badly off...

[dannybeckett]

do you have any reccomendations which do include all the features of th bip component?

[Matt Cramer]

do you have any reccomendations which do include all the features of th bip component?

Unfortunately, it's the only known component on the market in a TO-220 package with all those features - an ignition driver with both overcurrent protection and thermal shutdown. If there had been a more common component out there with these features, we would have used it - you won't believe how difficult it was to talk Bosch into selling those things to us.

[DonTZ125]

The only other driver I've seen that has these features is the VB325SP. The problem here is a) it's an 8-pin SMT, not a 3-pin TO-220, and b) it needs a 5v feed to operate. Available through Future Electronics, it's a few bucks cheaper than the BIP373 through Matt and the gang, but the fact that it isn't drop-in compatible means that any mods or adaptations would quickly eat any savings and more.

Just get the BIP from DIY - even with shipping, it'll be a worthwhile investment if you never ever have to replace a burned ignition driver!

[dannybeckett]

I see, what a pain! How much would you sell the BIP373s for on their own, to a reseller Matt? Do you think the other substitutions I have made will be OK?

Thanks for everyones time

[Matt Cramer]

BIPs on their own are $6.80 retail.

http://www.DIYAutoTune.com/catalog/repl ... p-242.html