A 15A transistor will be easily able to provide 3A need for the application.
Another
reason for a higher rating is that for brief moments the transistor may be
asked to provide
higher than 3A currents due to things called transients. Also an amp rating
is like a jar
of candies, you only take what you need. So a higher amp rating is actually
good and an
indication of the robustness of the transistor. Personally I would go for a
30A device because
the price difference is not that great. The circuits for these applications
are not that critical
so if you cannot get the said npn device, get any other in a TO3 CAN package
at 15A or above
rating.
Best Wishes
Zahid
ps: just came back from London, the weather there was absolutely fantastic.
Had the absolute
best rasberries I have ever had from roadside vendors.
Hi Alfred and Rex,
I am, I believe going to be the guinea pig on this and just want to ask
beforehand how the 3 amp. max. note on the voltage regulator case name
plate
compares with the Imax of 15 amps. I am assuming the Imax is the max
capacity of
the transistor and not the expected output? I am a tad out of practice and
don’t
wish to blow my alternator(again). That not withstanding I can’t tell you,
Rex,
how happy I am to be able (shortly) to put this VR/Alt
thing back where it belongs, in my Jag. and I thank you sincerely. Also in
keeping with my desire to be frank(being Fred just isn’t enough) and
aboveboard
I have also requested for the sake of my Jag and of course my right cheek,
some>information from another list member, can’t be too careful!
Thank-you,
- -Fred
| Zahid Ahsanullah, Intel Austin Design Center |
| StrongARM, SA1100, SA1500 design |
| Email: @Ahsanullah_Zahid |
| phone: 512-306-7421 |
| fax: 512-306-7441 |
|
|
|" One night in the mirror I saw a movie star, |
| so I flew to hollywood in a neighbors car." |
–Dada–