| Manufacturer | Part Number | Description |
|---|---|---|
Toshiba
| 2SD1221 | Silicon NPN Transistor |
Kexin Semiconductor
| 2SD1221 | NPN Transistors |
Fairchild (now onsemi)
| KSD1221 | Low Frequency Power Amplifier |
Toshiba
| D1221 | 2SD1221 |
Seme LAB
| D1221UK | METAL GATE RF SILICON FET |
Traco Electronic AG
| TED1221 | DC/DC Converter |
