| PartNumber | AT89LP428-20AU | AT89LP428-20JU | AT89LP428-20MH |
| Description | 8-bit Microcontrollers - MCU SingleCycle 8051 4K ISP Flash 2.4V | 8-bit Microcontrollers - MCU SingleCycle 8051 4K ISP Flash 2.4V | 8-bit Microcontrollers - MCU SingleCycle 8051 4K ISP Flash 2.4V |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | TQFP-32 | PLCC-32 | VQFN-32 |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 20 MHz | - | - |
| Program Memory Size | 4 kB | - | - |
| Data RAM Size | 512 B | - | - |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 30 I/O | - | - |
| Operating Supply Voltage | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Tray | Tube | Tray |
| Program Memory Type | Flash | - | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | - | - |
| Interface Type | SPI, UART | - | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 3 Timer | - | - |
| Processor Series | AT89x | AT89x | AT89x |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 250 | 32 | 490 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 2.4 V | - | - |
| Unit Weight | 0.002568 oz | - | - |