The H21A2 is a four pin single channel optical interrupt switch.
| Specifications: | |
| Package / Case | 4 Pin Dip | 
| Vceo | 30V | 
| Current If | 60mA | 
| Isolation Voltage | n/a | 
Note: Collector to Emitter voltage (Vceo), forward current (If), voltage isolation (Viso) will vary on manufacture integrated circuits.