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Datasheet Replacement Marking Code
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25LC128
AT89C51AC2 (2)AT89C51AC (9)AT89C51 (181)AT89C5 (195)AT89C (220)AT89 (400)AT8 (261)
Atmel

AT89C51AC2-RLTUM

80C51 89C Microcontroller IC 8-Bit 40MHz 32KB (32K x 8) FLASH 44-VQFP (10x10)
Atmel

AT89C51AC2-SLSUM

80C51 89C Microcontroller IC 8-Bit 40MHz 32KB (32K x 8) FLASH 44-PLCC (16.59x16.59)
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