| PartNumber | AT89C51RB2-3CSUM | AT89C51RB2-RLRUL | AT89C51RB2-3CSUL |
| Description | 8-bit Microcontrollers - MCU C51RB2 FLASH 5V 16k ind | 8-bit Microcontrollers - MCU C51RB2 FLASH 3V 16k ind | 8-bit Microcontrollers - MCU 8-bit 16K Flash C51RB2 |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | - |
| Mounting Style | Through Hole | SMD/SMT | Through Hole |
| Package / Case | PDIL-40 | LQFP-44 | PDIP-40 |
| Series | 89C | - | - |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 60 MHz | 60 MHz | 60 MHz |
| Program Memory Size | 16 kB | 16 kB | 16 kB |
| Data RAM Size | 1.25 kB | 1.25 kB | 1.25 kB |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 32 I/O | 32 I/O | 32 I/O |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Tube | Reel | Tube |
| Height | 4.83 mm | - | - |
| Length | 52.58 mm | - | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Width | 13.97 mm | - | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Interface Type | SPI, UART | SPI, UART | SPI, UART |
| Number of Timers/Counters | 3 Timer | 3 Timer | 3 Timer |
| Processor Series | AT89x | AT89x | AT89x |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 9 | 1500 | 10 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 2.7 V | - | - |
| Unit Weight | 0.451930 oz | 0.012561 oz | 0.210004 oz |
| Moisture Sensitive | - | Yes | - |