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25LC128
AT87C51RB2-SLSU (2)AT87C51RB2-SL (3)AT87C51RB2 (7)AT87C51R (21)AT87C5 (42)AT87 (63)AT8 (261)
Atmel

AT87C51RB2-SLSUL

80C51 87C Microcontroller IC 8-Bit 30/20MHz 16KB (16K x 8) OTP 44-PLCC (16.59x16.59)
Atmel

AT87C51RB2-SLSUM

80C51 87C Microcontroller IC 8-Bit 40/20MHz 16KB (16K x 8) OTP 44-PLCC (16.59x16.59)
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