| Manufacturer | Part Number | Description |
|---|---|---|
NTE Electronics |
2N4991 | Silicon Bilateral Switch |
| ETC Unknown Manufacturer | 2N4992 | Silicon bilateral switch Transistor |
| ETC Unknown Manufacturer | 2N4991 | Silicon bilateral switch Transistor |
| ETC Unknown Manufacturer | 2N4990 | Silicon unilateral switch Transistor |
Motorola Semiconductor |
2N499 | PNP Transistor |
| ETC Unknown Manufacturer | 2N4993 | Silicon bilateral switch Transistor |
|
Motorola Semiconductor |
2N499A | PNP Transistor |
|
Motorola Semiconductor |
2N4993 | SILICON BIDIRECTIONAL SWITCH TRANSISTOR |