ATMEGA161L-4PI Equivalent & Substitute Parts

Part Overview

The ATMEGA161L-4PI 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-4PI is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	ATMEGA161L-4PI
Manufacturer	Microchip Technology
Core Processor	AVR
Core Size	8-Bit
Speed	4MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	1K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	35
Connectivity	SPI, UART/USART
Peripherals	POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

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

Memory Configuration: Program memory must be 16KB FLASH minimum, EEPROM 512 x 8 bytes minimum, and RAM 1K x 8 bytes minimum to maintain functional equivalence.

Package Compatibility: The substitute must use 40-PDIP package format to ensure mechanical and electrical pin compatibility with existing PCB layouts.

Core Architecture: The substitute must utilize the AVR core processor architecture to maintain instruction set compatibility.

Voltage Supply Range: The substitute must support the 2.7V to 5.5V supply voltage range or a range that encompasses this specification.

I/O Count: The substitute must provide a minimum of 35 I/O pins.

Connectivity Interfaces: The substitute must include SPI and UART/USART connectivity as minimum requirements.

Operating Temperature: The substitute must support the -40°C to 85°C operating temperature range.

The ATMEGA162V-8PU meets all substitution criteria while offering enhanced specifications including higher clock speed (8MHz), expanded voltage range (1.8V to 5.5V), and active product status.

Parameter Comparison

Parameter	ATMEGA161L-4PI	ATMEGA162V-8PU
Manufacturer	Microchip Technology	Atmel
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	4MHz	8MHz
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	512 x 8	512 x 8
RAM Size	1K x 8	1K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	1.8V ~ 5.5V
Number of I/O	35	35
Connectivity	SPI, UART/USART	EBI/EMI, SPI, UART/USART
Peripherals	POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ATMEGA162V-8PU is a direct substitute for the ATMEGA161L-4PI based on the following engineering criteria:

Product Status Alignment: The ATMEGA162V-8PU maintains active product status, ensuring long-term availability and manufacturing support compared to the obsolete ATMEGA161L-4PI.

Memory Equivalence: Both devices provide identical program memory (16KB FLASH), EEPROM (512 x 8), and RAM (1K x 8) configurations, ensuring software compatibility without modification.

Package Compatibility: Both devices utilize the 40-DIP package format with identical pin spacing (0.600", 15.24mm), enabling direct PCB layout compatibility.

Voltage Supply Compatibility: The ATMEGA162V-8PU supply range (1.8V to 5.5V) encompasses the ATMEGA161L-4PI range (2.7V to 5.5V), providing backward compatibility with existing power supply designs.

Connectivity and Peripherals: The ATMEGA162V-8PU includes all required connectivity interfaces (SPI, UART/USART) and peripherals (POR, PWM, WDT) with additional features (Brown-out Detect/Reset, EBI/EMI) that enhance system robustness.

Performance Enhancement: The doubled clock speed (8MHz versus 4MHz) provides improved processing capability without requiring design modifications.

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices use the 40-DIP package with identical pin configurations and spacing. No PCB layout changes are required for mechanical and electrical compatibility.

Q: Are there software compatibility concerns when substituting the ATMEGA162V-8PU for the ATMEGA161L-4PI?

A: No. Both devices use the AVR core architecture with identical memory configurations (16KB FLASH, 1KB RAM, 512 bytes EEPROM). Existing firmware requires no modification for functional operation.

Q: What is the impact of the higher clock speed (8MHz) on the ATMEGA162V-8PU compared to the 4MHz ATMEGA161L-4PI?

A: The higher clock speed increases instruction execution rate, reducing code execution time. Timing-critical applications must verify that existing delay routines and peripheral timing remain appropriate for the new clock frequency.

Q: Does the expanded voltage supply range of the ATMEGA162V-8PU (1.8V to 5.5V) affect compatibility with existing power supplies designed for the ATMEGA161L-4PI (2.7V to 5.5V)?

A: No. The ATMEGA162V-8PU accepts the full voltage range of the ATMEGA161L-4PI. Existing power supply designs operate without modification.

Q: What additional peripherals does the ATMEGA162V-8PU provide compared to the ATMEGA161L-4PI?

A: The ATMEGA162V-8PU includes Brown-out Detect/Reset and EBI/EMI connectivity. These features enhance system reliability and expand interface capabilities without affecting existing functionality.

Q: Is the ATMEGA162V-8PU available in the same packaging format as the ATMEGA161L-4PI?

A: Yes. Both devices are available in 40-DIP (0.600", 15.24mm) package format, ensuring identical mechanical compatibility.

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