THORLABS SH05 Operating Manual page 9

Ø1/2" Beam Shutters Chapter 4: Specifications
A schematic snippet to show the pin assignments: Typically pins 4 and 5 (cathode
and emitter) are tied to circuit ground. The anode is the anode connection of an IR
LED. This is tied to a voltage source (Vsupply) thru a current set resistor. Current
could be set to 10 mA (0.01 A), then the forward voltage for the LED is around
1.2 V. So to set the LED current the resistor value would be (Vsupply-
1.2 V)/0.01 A. The LED should be on always when the shutter is in operation.
The Collector pin is the output signal and needs a pullup resistor to an
appropriate logic supply, typically 3.3 V or 5 V. Do not use more than 5 V.
Rev D, March 16, 2020 Page 7