I'm using it on the output of an 18F4550. With the tiny coil on a reed relay, do you still need a diode in parallel with the coil? I want to use this in an automotive application and I have very little experience with reed relays. Do I need to be concerned about vibration? The PCB will be mounted in the passenger compartment but housed in a plastic case. The contact current will be less than 15mA.