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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  F521 | U.L. Approved Dual Function Fuse Resistors | IRC - a TT electronics Company. | IRCTT | - | - | - | 175 Kb |
| 2. | F521 | U.L. Approved Dual Function Fuse Resistors | IRC - a TT electronics Company. | IRCTT | - | - | - | 175 Kb |
| 3. | KF521 | MOSFIELD EFFECT TRANSISTORS MOS FELDEFFECT - TRANSISTOREN | List of Unclassifed Manufacturers | ETC | - | - | - | 110 Kb |
| 4. | ARF521 | N-CHANNEL ENHANCEMENT MODE POWER MOSFETs | Advanced Power Technology | ADPOW | - | - | - | 182 Kb |
| 5. | ARF521 | RF POWER MOSFET N-CHANNEL ENHANCEMENT MODE | Microsemi Corporation | MICROSEMI | - | - | - | 128 Kb |
| 6. | 74F521 | 8-bit identity comparator | NXP Semiconductors | PHILIPS | - | - | - | 90 Kb |
| 7. | 74F521 | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 87 Kb |
| 8. | 54F521 | 8-Bit Identity Comparator | National Semiconductor | NSC | - | - | - | 173 Kb |
| 9. | BLF521 | UHF power MOS transistor | NXP Semiconductors | PHILIPS | - | - | - | 105 Kb |
| 10. | IRF521 | N - CHANNEL ENHANCEMENT MODE VERTICAL DMOS POWER FETs | Supertex, Inc | SUTEX | - | - | - | 78 Kb |
| 11. | IRF521 | N-Channel Power MOSFETs, 11 A, 60-100 V | Fairchild Semiconductor | FAIRCHILD | - | - | - | 172 Kb |
| 12. | OPF521 | 5 MBd Fiber optic receiver | OPTEK Technologies | OPTEK | - | - | - | 150 Kb |
| 13. | CSNF521 | Solid State Sensors Closed Loop Current Sensors | Honeywell Solid State Electronics Center | HONEYWELL | - | - | - | 711 Kb |
| 14. | SN54F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 68 Kb |
| 15. | SN54F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 457 Kb |
| 16. | SN54F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 602 Kb |
| 17. | SN74F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 68 Kb |
| 18. | SN74F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 457 Kb |
| 19. | SN74F521 | 8-BIT IDENTITY COMPARATORS | Texas Instruments | TI | - | - | - | 602 Kb |
| 20. | ST72F521 | 80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE | STMicroelectronics | STMICROELECTRONICS | - | - | - | 1.65 Mb |
| 21. | XC6101F521 | CMOS Voltage Detector | Torex Semiconductor | TOREX | - | - | - | 541 Kb |
