ATMEGA161L-4PC Equivalent & Substitute Parts

Part Overview

The ATMEGA161L-4PC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB FLASH program memory, 1KB RAM, and 512 bytes EEPROM. This device operates at 4MHz with a supply voltage range of 2.7V to 5.5V and is housed in a 40-PDIP package. The ATMEGA161L-4PC is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements.

Substiute Parts

ATMEGA161L-4PC

Microchip TechnologyIn Stock: 1058ATMEGA161L-4PC Datasheet

Current PartRFQ

ATMEGA162V-8PU

AtmelIn Stock: 2144ATMEGA162V-8PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATMEGA161L-4PC is determined by the following critical parameters:

Memory Configuration: Program memory must be 16KB FLASH (8K x 16), EEPROM 512 x 8, and RAM 1K x 8. These specifications are non-negotiable for functional compatibility.

Package Compatibility: The 40-PDIP package is mandatory. Pin count and physical dimensions must match exactly to ensure direct board-level replacement without layout modifications.

Core Architecture: AVR core processor architecture is required to maintain instruction set compatibility and software portability.

I/O Count: 35 I/O pins must be preserved to support existing circuit designs.

Connectivity Interfaces: SPI and UART/USART interfaces must be present to maintain communication protocol support.

Voltage Supply Range: The substitute must operate within the 2.7V to 5.5V range or provide a compatible subset that covers the application's operating voltage.

The ATMEGA162V-8PU meets these substitution criteria while offering enhanced specifications including higher operating speed (8MHz), extended temperature range (-40°C to 85°C), improved voltage tolerance (1.8V to 5.5V), and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ATMEGA162V-8PU is the qualified substitute for the ATMEGA161L-4PC based on the following engineering criteria:

Product Status Alignment: The ATMEGA162V-8PU maintains active product status with Atmel, ensuring long-term availability and supply chain continuity. The ATMEGA161L-4PC obsolete status necessitates migration to an active alternative.

Compliance and Certifications: Both devices share identical ECCN (EAR99) and HTSUS (8542.31.0001) classifications, maintaining regulatory consistency for export and trade purposes.

Functional Equivalence: Identical memory architecture (16KB FLASH, 512 bytes EEPROM, 1KB RAM), I/O count (35 pins), and core processor (AVR) ensure software and hardware compatibility at the functional level.

Enhanced Specifications: The ATMEGA162V-8PU provides superior performance characteristics including doubled clock speed (8MHz versus 4MHz), extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), lower minimum supply voltage (1.8V versus 2.7V), and additional brown-out detection functionality. These enhancements do not compromise backward compatibility.

Package Compatibility: Both devices utilize identical 40-PDIP packaging, enabling direct board-level substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA162V-8PU be used as a direct replacement for the ATMEGA161L-4PC without PCB modifications?

A: Yes. Both devices share identical 40-PDIP packaging, pin count (35 I/O), and memory configuration (16KB FLASH, 1KB RAM, 512 bytes EEPROM). Direct socket substitution is possible without layout changes.

Q: What are the key differences between these two microcontrollers?

A: The ATMEGA162V-8PU operates at 8MHz compared to the ATMEGA161L-4PC at 4MHz, supports a lower minimum supply voltage (1.8V versus 2.7V), features an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), includes brown-out detection, and maintains active product status versus obsolete status.

Q: Will existing firmware compiled for the ATMEGA161L-4PC execute on the ATMEGA162V-8PU?

A: Yes. Both devices use identical AVR core architecture and instruction set. Firmware compatibility is maintained. The higher clock speed of the ATMEGA162V-8PU may require timing adjustments in applications with strict temporal requirements.

Q: Are there supply voltage considerations when substituting these devices?

A: The ATMEGA162V-8PU supports 1.8V to 5.5V operation, providing broader voltage compatibility than the ATMEGA161L-4PC (2.7V to 5.5V). Applications operating at 2.7V to 5.5V are fully compatible with both devices. Applications requiring operation below 2.7V can only use the ATMEGA162V-8PU.

Q: What connectivity interfaces are available on both devices?

A: Both devices include SPI and UART/USART interfaces. The ATMEGA162V-8PU additionally provides EBI/EMI (External Bus Interface/External Memory Interface) connectivity, offering expanded system integration capabilities.

Q: How do the peripheral sets compare?

A: Both devices include POR (Power-On Reset), PWM (Pulse Width Modulation), and WDT (Watchdog Timer). The ATMEGA162V-8PU adds brown-out detection and reset functionality for enhanced power supply monitoring.