V G wrote:
> Coil Power: 1200 mW
> Nominal Voltage: 12Vdc
> Pick-Up Voltage: 8.4Vdc
> Drop-Out Voltage: 1.2Vdc
> Maximum Voltage: 14.4Vdc
> Coil Resistance: 120ohm
>
> Olin suggested the IRLML2502, which is a nice MOSFET, but Mouser
> doesn't stock it, and I'm going to be using Mouser as my supplier.

I also said this doesn't need a FET at all.  A simple NPN with base resisto=
r
will do fine.  As I also said, I use MMBT4401 for such jellybean
applications.

You need it to sink 100mA.  Let's say the transistor has a gain of 50 for
now, so that means you need a minimum of 2mA base current.  I don't remembe=
r
your supply voltage, so let's say 3.3V, which leaves about 2.6V accross the
resistor.  2.6V / 2mA =3D 1.3kOhms.  That's the absolute maximum, so 1kOhm
sounds like a good answer.

I'm quite sure Mouser has MMBT4401 and 1kOhm resistors in stock.


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