| 4N37SD | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37SM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37SR2M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37SR2VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37SVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37TM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37TVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N37W | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N38 | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N38 | Toshiba | Photocouplers - Transistor Output |
| 4N38 | Vishay | Optocouplers |
| 4N38300 | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N38300W | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N383S | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N383SD | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N38S | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N38SD | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N38W | Fairchild Semiconductor | 6-pin DIP High Voltage Phototransistor Output Optocoupler |
| 4N39 | Fairchild Semiconductor | 6-Pin DIP Photo SCR Output Optocoupler |