| 4N28 | Vishay | Optocouplers |
| 4N28-M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28-X009 | Vishay | Optocouplers |
| 4N28300 | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28300W | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N283S | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N283SD | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28FM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28FR2M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28FR2VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28FVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28S | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28SD | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28SM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28SR2M | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28SR2VM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28SVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28TM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |
| 4N28TVM | Fairchild Semiconductor | 6-Pin DIP Package Phototransistor Output Optocoupler |