| PartNumber | ATMEGA161L-4AI | ATMEGA161L-4AC | ATMEGA161L-4PC |
| Description | 8-bit Microcontrollers - MCU 16k byte | 8-bit Microcontrollers - MCU 16k byte | IC MCU 8BIT 16KB FLASH 40DIP |
| Manufacturer | Microchip | Microchip | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | N | N | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | TQFP-44 | TQFP-44 | - |
| Series | ATmega161 | ATmega161 | - |
| Core | AVR | AVR | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 4 MHz | 4 MHz | - |
| Program Memory Size | 16 kB | 16 kB | - |
| Data RAM Size | 1 kB | 1 kB | - |
| ADC Resolution | No ADC | No ADC | - |
| Number of I/Os | 35 I/O | 35 I/O | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | - |
| Minimum Operating Temperature | - 40 C | 0 C | - |
| Maximum Operating Temperature | + 85 C | + 70 C | - |
| Height | 1 mm | 1.05 mm | - |
| Length | 10 mm | 10.1 mm | - |
| Product | MCU | MCU | - |
| Program Memory Type | Flash | Flash | - |
| Width | 10 mm | 10.1 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Data RAM Type | SRAM | SRAM | - |
| Data ROM Size | 512 B | 512 B | - |
| Data ROM Type | EEPROM | EEPROM | - |
| Interface Type | SPI, UART | SPI, UART | - |
| Number of Timers/Counters | 3 Timer | 2 Timer | - |
| Processor Series | megaAVR | megaAVR | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Tradename | AVR | AVR | - |