I have a need to control 8 automotive relays from a Mega 2560 board and I'm looking for suggestions on the proper component to use. I'm assuming I'll need a Darlington Transistor or a MosFet as I suspect the task to be beyond a standard transistor.
The relays I'll be controlling are these: http://www.mouser.com/Search/ProductDetail.aspx?R=301-1C-S-D1-12VDC
Basic specs are:
Coil Voltage: 12 VDC
Contact Form: SPDT (1 Form C)
Coil Resistance: 123 Ohms
Coil Current: 97.5 mA
Contact Rating: 35 A
The relays will be switching the high side in an automotive environment (nominal 12V DC, Neg Ground)
I'm also considering using opto-isolators between the Arduino and the transistors/mosfets if that makes a difference.
Any advice would be appreciated.