| PartNumber | AT87C51RD2-RDTUL | AT87C51RD2-RLTUM |
| Description | 8-bit Microcontrollers - MCU C52 0.5 mX 2 OTP 3.3V | 8-bit Microcontrollers - MCU C52 0.5 m X 2 OTP 5V |
| Manufacturer | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT |
| Package / Case | LQFP-64 | VQFP-44 |
| Core | 80C51 | 80C51 |
| Data Bus Width | 8 bit | 8 bit |
| Maximum Clock Frequency | 40 MHz | 40 MHz |
| Program Memory Size | 64 kB | 64 kB |
| Data RAM Size | 1 kB | 1 kB |
| ADC Resolution | No ADC | No ADC |
| Number of I/Os | 32 I/O | 32 I/O |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Product | MCU | MCU |
| Program Memory Type | OTP | OTP |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Interface Type | UART | UART |
| Number of Timers/Counters | 3 Timer | 3 Timer |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 800 | 800 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU |
| Unit Weight | 0.012088 oz | - |
| Series | - | 87C |
| Minimum Operating Temperature | - | - 40 C |
| Maximum Operating Temperature | - | + 85 C |
| Height | - | 1.45 mm |
| Length | - | 10.1 mm |
| Width | - | 10.1 mm |
| Supply Voltage Max | - | 5.5 V |
| Supply Voltage Min | - | 4.5 V |