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| PartNumber | AT87C51RD2-3CSUL | AT87C51RD2-3CSUM | AT87C51RD2-MC |
| Description | 8-bit Microcontrollers - MCU C52 0.5 m X 2 OTP 0.5 NV 3.3V | IC MCU 8BIT 64KB OTP 40PDIL | |
| Manufacturer | Microchip | - | - |
| Product Category | 8-bit Microcontrollers - MCU | - | - |
| RoHS | Y | - | - |
| Mounting Style | Through Hole | - | - |
| Package / Case | PDIL-40 | - | - |
| Series | 87C | - | - |
| Core | 80C51 | - | - |
| Data Bus Width | 8 bit | - | - |
| Maximum Clock Frequency | 40 MHz | - | - |
| Program Memory Size | 64 kB | - | - |
| Data RAM Size | 1 kB | - | - |
| ADC Resolution | No ADC | - | - |
| Number of I/Os | 32 I/O | - | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | - | - |
| Minimum Operating Temperature | 0 C | - | - |
| Maximum Operating Temperature | + 70 C | - | - |
| Height | 4.95 mm | - | - |
| Length | 53.21 mm | - | - |
| Product | MCU | - | - |
| Program Memory Type | OTP | - | - |
| Width | 14.73 mm | - | - |
| Brand | Microchip Technology / Atmel | - | - |
| Interface Type | UART | - | - |
| Number of Timers/Counters | 3 Timer | - | - |
| Product Type | 8-bit Microcontrollers - MCU | - | - |
| Factory Pack Quantity | 216 | - | - |
| Subcategory | Microcontrollers - MCU | - | - |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 2.7 V | - | - |