Are there any brands of small signal coil based relays (reed or magnetic) that can be directly hooked up to a PIC I/O pin without a driving transistor?
Some miniature PCB mount DIP relays are <30ma. But is it prudent enough to load the Pic port with an inductive load??
Correct clamping of the transients is essential to guarantee the Pic' s life-cycle!
What about those solid state relays? I've never actually used one, or felt the need to actually investigate them. I assume they are just some sort of transistor mod.
I've used the Fairchild versions in the DIP-8 package, but usually for driving relays (grin)...
The LED input side requires about 1.6v at 3.0-ma and the output side is good for 250-vdc at around 300-ma (parallel drains) or 250-vac (peak) at around 190-ma... The 400v versions provide about 200-ma (dc parallel) or 120-ma (ac)...
If switching AC loads, you might look at the Teccor series of Sensitive Gate Triacs with current capability up to about 8-amps... Most of these can be driven directly by a PIC output pin though I'm not sure I'd recommend it...
Some miniature PCB mount DIP relays are <30ma. But is it prudent enough to load the Pic port with an inductive load??
Correct clamping of the transients is essential to guarantee the Pic' s life-cycle!
Some miniature PCB mount DIP relays are <30ma. But is it prudent enough to load the Pic port with an inductive load??
Correct clamping of the transients is essential to guarantee the Pic' s life-cycle!
This will take you to a data sheet for a SIP (Single Inline Package) relay. This can be activated with less than 5V. Since the coil is 500 Ohms, this means your activation current is well within the PIC's capabilities.
These are available with an optional protective diode. DigiKey has them. Their P/N is 306-1066-ND, $4.00 each.
This will take you to a data sheet for a SIP (Single Inline Package) relay. This can be activated with less than 5V. Since the coil is 500 Ohms, this means your activation current is well within the PIC's capabilities.
These are available with an optional protective diode. DigiKey has them. Their P/N is 306-1066-ND, $4.00 each.