| 4N27300 | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27300W | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N273S | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N273SD | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27FM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27FR2M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27FR2VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27FVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27S | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27SD | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27SM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27SR2M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27SR2VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27SVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27TM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27TVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N27W | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28 | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |