| Manufacturer | Part Number | Description |
|---|---|---|
| General Instrument Optoelectronics General Instrument Optoelectronics | MCL2501 | High Speed Transistor Optocouplers |
| ETC Unknown Manufacturer | MCL25 | Edison Fuses - General Purpose Midget Class MCL |
| General Instrument Optoelectronics General Instrument Optoelectronics | MCL2502 | High Speed Transistor Optocouplers |
| General Instrument Optoelectronics General Instrument Optoelectronics | MCL2503 | High Speed Transistor Optocouplers |