| PartNumber | AT89C51-24JI | AT89C51-24AC | AT89C51-24PC |
| Description | 8-bit Microcontrollers - MCU UNSAWN WAFER 21 MIL BACKGRIND 89C51 - 24MHZ, PLCC, IND TEMP | 8-bit Microcontrollers - MCU Microcontroller | 8-bit Microcontrollers - MCU 80C31 w/4k |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | N | N | N |
| Mounting Style | SMD/SMT | SMD/SMT | Through Hole |
| Package / Case | PLCC-44 | TQFP-44 | PDIP-40 |
| Series | 89C | 89C | 89C |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 24 MHz | 24 MHz | 24 MHz |
| Program Memory Size | 4 kB | 4 kB | 4 kB |
| Data RAM Size | 128 B | 128 B | 128 B |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 32 I/O | 32 I/O | 32 I/O |
| Operating Supply Voltage | 5 V | - | 5 V |
| Minimum Operating Temperature | - 40 C | 0 C | 0 C |
| Maximum Operating Temperature | + 85 C | + 70 C | + 70 C |
| Height | 3.48 mm | 1.05 mm | 4.83 mm |
| Length | 16.7 mm | 10.1 mm | 52.58 mm |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Width | 16.7 mm | 10.1 mm | 13.97 mm |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data ROM Type | Flash | - | Flash |
| Number of Timers/Counters | 2 Timer | 2 Timer | 2 Timer |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 27 | 160 | 9 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 6 V | 6 V | 6 V |
| Supply Voltage Min | 4 V | 4 V | 4 V |
| Unit Weight | 0.084185 oz | - | 0.210004 oz |