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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  BF421 | PNP Silicon Transistors (High breakdown voltage Low collector-emitter saturation voltage) | Siemens Semiconductor Group | SIEMENS | - | - | - | 129 Kb |
| 2. | BF421 | High Voltage Transistors(PNP) | Motorola, Inc | MOTOROLA | - | - | - | 124 Kb |
| 3. | BF421 | Small Signal Transistors (PNP) | General Semiconductor | GE | - | - | - | 40 Kb |
| 4. | BF421 | High Voltage Transistors(PNP Silicon) | ON Semiconductor | ONSEMI | - | - | - | 87 Kb |
| 5. | BF421 | SILICON PNP TRIPLE DIFFUSED TYPE (HIGH VOLTAGE SWITCHING AND AMPLIFIER,COLOR TV CHROMA OUTPUT) | KEC(Korea Electronics) | KEC | - | - | - | 385 Kb |
| 6. | BF421 | PNP high-voltage transistors | NXP Semiconductors | PHILIPS | - | - | - | 48 Kb |
| 7. | BF421 | PNP high voltage transistors | NXP Semiconductors | PHILIPS | - | - | - | 48 Kb |
| 8. | BF421 | TO-92 PACKAGE | KEC(Korea Electronics) | KEC | - | - | - | 15 Kb |
| 9. | BF421 | PNP SILICON PLANAR EPITAXIAL HIGH VOLTAGE VIDEO TRANSISTORS | TRANSYS Electronics Limited | TEL | - | - | - | 84 Kb |
| 10. | BF421 | SMALL SIGNAL PNP TRANSISTOR | STMicroelectronics | STMICROELECTRONICS | - | - | - | 44 Kb |
| 11. | BF421 | SILICON PNP TRIPLE DIFFUSED TYPE | KEC(Korea Electronics) | KEC | - | - | - | 44 Kb |
| 12. | BF421 | High Voltage Transistors | ON Semiconductor | ONSEMI | - | - | - | 100 Kb |
| 13. | BF421 | PNP Silicon Plastic-Encapsulate Transistor | Micro Commercial Components | MCC | - | - | - | 216 Kb |
| 14. | HBF421 | PNP EPITAXIAL PLANAR TRANSISTOR | Hi-Sincerity Mocroelectronics | HSMC | - | - | - | 50 Kb |
| 15. | IRF421 | 2.2A and 2.5A, 450V and 500V, 3.0 and 4.0 Ohm, N-Channel Power MOSFETs | Intersil Corporation | INTERSIL | - | - | - | 77 Kb |
| 16. | MRF421 | RF POWER TRANSISTORS NPN SILICON | Motorola, Inc | MOTOROLA | - | - | - | 108 Kb |
| 17. | MRF421 | The RF Line NPN Silicon RF Power Transistor | Tyco Electronics | TYCO | - | - | - | 136 Kb |
| 18. | OPF421 | FIBER OPTIC PIN PHOTODIODE IN SMA RECEPTACLE | OPTEK Technologies | OPTEK | - | - | - | 264 Kb |
| 19. | IRF421 | N-CHANNEL POWER MOSFETS | Samsung semiconductor | SAMSUNG | - | - | - | 217 Kb |
| 20. | IRF421 | N-Channel Power MOSFETs, 3.0 A, 450 V/500 V | Fairchild Semiconductor | FAIRCHILD | - | - | - | 163 Kb |
