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| PartNumber | AT87251G2D-3CSUM | AT87251G2D-RLTUM | AT87251G2D-24CB |
| Description | 8-bit Microcontrollers - MCU OTP 8/16bit St 5V 24MHz | 8-bit Microcontrollers - MCU 251G2D 8/16bitC OTP 5V | |
| Manufacturer | Microchip | Microchip | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | - | - |
| Mounting Style | Through Hole | SMD/SMT | - |
| Package / Case | PDIL-40 | VQFP-44 | - |
| Series | 8x251 | 8x251 | - |
| Core | 80C51 | 80C51 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 24 MHz | 24 MHz | - |
| Program Memory Size | 32 kB | 32 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 | 4.5 V to 5.5 V | 4.5 V to 5.5 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Height | 4.95 mm | 1.45 mm | - |
| Length | 53.21 mm | 10.1 mm | - |
| Program Memory Type | EPROM | EPROM | - |
| Width | 14.73 mm | 10.1 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Interface Type | SPI, TWI, UART | SPI, TWI, UART | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 216 | 800 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |