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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  4521B | 24-STAGE BINARY COUNTER | List of Unclassifed Manufacturers | ETC | - | - | - | 70 Kb |
| 2. | AS2521B | Telephone Speech Circuit with Loudhearing and Handsfree | austriamicrosystems AG | AMSCO | - | - | - | 110 Kb |
| 3. | AS3521B | Advanced Audio Decoder | austriamicrosystems AG | AMSCO | - | - | - | 187 Kb |
| 4. | 1N5521B | 0.4W LOW VOLTAGE AVALANCHE DIODES | Jinan Gude Electronic Device | JGD | - | - | - | 245 Kb |
| 5. | 1N5521B | LOW REVERSE LEAKAGE CHARACTERISTICS | Compensated Deuices Incorporated | CDIDIODE | - | - | - | 99 Kb |
| 6. | 1N5521B | LOW REVERSE LEAKAGE CHARACTERISTICS | Microsemi Corporation | MICROSEMI | - | - | - | 107 Kb |
| 7. | 1N5521B | LEADLESS PACKAGE FOR SURFACE MOUNT ZENER DIODE, 500mW | Microsemi Corporation | MICROSEMI | - | - | - | 103 Kb |
| 8. | CD4521B | CMOS 24-STAGE FREQUENCY DIVIDER | Texas Instruments | TI | - | - | - | 280 Kb |
| 9. | CD5521B | ZENER DIODE CHIPS | Compensated Deuices Incorporated | CDIDIODE | - | - | - | 117 Kb |
| 10. | PT6521B | 8-A 5-V/3.3-V Input Adjustable ISR with Short-Circuit protection | Texas Instruments | TI | - | - | - | 222 Kb |
| 11. | PT1521B | 1206 Package Chip Phototransistor | Everlight Electronics Co., Ltd | EVERLIGHT | - | - | - | 191 Kb |
| 12. | MZ5521B | Low voltage avalanche passivated silicon oxide zener regulator diodes, 500 mW, zener voltage 4.3V | Motorola, Inc | MOTOROLA | - | - | - | 465 Kb |
| 13. | MC14521B | 24-Stage Frequency Driver | Motorola, Inc | MOTOROLA | - | - | - | 271 Kb |
| 14. | HCF4521B | 24 STAGE FREQUENCY DIVIDER | STMicroelectronics | STMICROELECTRONICS | - | - | - | 115 Kb |
| 15. | HD14521B | 24-Stage Frequency Divider | Hitachi Semiconductor | HITACHI | - | - | - | 101 Kb |
| 16. | MLL5521B | Low Voltage Surface Mount 500 mW Avalanche Diodes | Microsemi Corporation | MICROSEMI | - | - | - | 183 Kb |
| 17. | HEF4521B | 24-stage frequency divider and oscillator | NXP Semiconductors | PHILIPS | - | - | - | 170 Kb |
| 18. | NCP1521B | 1.5 MHz, 600 mA Step−Down DC−DC Converter | ON Semiconductor | ONSEMI | - | - | - | 224 Kb |
| 19. | ST72521B | 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 |
| 20. | MC14521B | 24-Stage Frequency Divider | ON Semiconductor | ONSEMI | - | - | - | 234 Kb |
