ATMEGA169A-MCHR Equivalent & Substitute Parts

Part Overview

The ATMEGA169A-MCHR is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 16KB FLASH memory, 1KB RAM, and 512 bytes EEPROM. This device is designed for embedded applications requiring moderate processing capability with integrated peripherals including SPI, UART/USART, and USI connectivity. The part is currently in active production status with 826 units in stock. Substitute parts are identified when electrical specifications and mechanical compatibility remain within acceptable parameters for the application.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	1K x 8
Number of I/O	54
Connectivity	SPI, UART/USART, USI
Peripherals	Brown-out Detect/Reset, LCD, POR, PWM, WDT
Data Converters	A/D 8x10b
Oscillator Type	Internal
Mounting Type	Surface Mount
Package / Case	64-VQFN Dual Rows, Exposed Pad
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the ATMEGA169A-MCHR is determined by strict equivalence across the following critical parameters:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (16MHz)
Memory configuration (16KB FLASH, 1KB RAM, 512 bytes EEPROM)
I/O count (54 pins)
Peripheral set (SPI, UART/USART, USI, Brown-out Detect/Reset, LCD, POR, PWM, WDT)
Package type (64-VQFN Dual Rows, Exposed Pad)
Operating temperature range (-40°C ~ 85°C)
Compliance certifications (ROHS3, REACH Unaffected)

The ATMEGA169P-16MCHR qualifies as a direct substitute based on identical core specifications, memory configuration, I/O architecture, and package format. Voltage supply range differences do not preclude substitution when application requirements fall within the overlapping specification window.

Parameter Comparison

Parameter	ATMEGA169A-MCHR	ATMEGA169P-16MCHR	Compatibility
Manufacturer	Microchip Technology	Microchip Technology	Identical
Core Processor	AVR	AVR	Identical
Core Size	8-Bit	8-Bit	Identical
Speed	16MHz	16MHz	Identical
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)	Identical
EEPROM Size	512 x 8	512 x 8	Identical
RAM Size	1K x 8	1K x 8	Identical
Number of I/O	54	54	Identical
Connectivity	SPI, UART/USART, USI	SPI, UART/USART, USI	Identical
Peripherals	Brown-out Detect/Reset, LCD, POR, PWM, WDT	Brown-out Detect/Reset, LCD, POR, PWM, WDT	Identical
Data Converters	A/D 8x10b	A/D 8x10b	Identical
Oscillator Type	Internal	Internal	Identical
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	2.7V ~ 5.5V	Overlapping range
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	64-VQFN Dual Rows, Exposed Pad	64-VQFN Dual Rows, Exposed Pad	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	3 (168 Hours)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both the ATMEGA169A-MCHR and ATMEGA169P-16MCHR maintain active production status with full ROHS3 compliance and REACH unaffected certification. Selection between these parts is based on supply availability and voltage supply requirements. The ATMEGA169A-MCHR supports operation from 1.8V, extending functionality to ultra-low-power applications. The ATMEGA169P-16MCHR operates from 2.7V minimum, suitable for standard battery-powered and regulated supply applications. Both devices are qualified for the full industrial temperature range of -40°C to 85°C and are packaged identically in 64-VQFN format with exposed pad. Moisture sensitivity level 3 applies to both variants, requiring controlled storage conditions during 168-hour windows.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA169P-16MCHR replace ATMEGA169A-MCHR in existing designs?

A: Yes, when the application supply voltage remains at or above 2.7V. The ATMEGA169P-16MCHR is electrically and mechanically compatible with identical core architecture, memory configuration, I/O count, peripheral set, and package format. Applications requiring operation below 2.7V must retain the ATMEGA169A-MCHR.

Q: What is the difference between these part numbers?

A: The primary difference is the minimum supply voltage specification. ATMEGA169A-MCHR operates from 1.8V minimum, while ATMEGA169P-16MCHR requires 2.7V minimum. All other electrical and mechanical parameters are identical.

Q: Are the packages physically identical?

A: Yes. Both parts use the 64-VQFN Dual Rows package with exposed pad. PCB footprints, solder reflow profiles, and handling procedures are identical.

Q: What compliance certifications apply to both parts?

A: Both ATMEGA169A-MCHR and ATMEGA169P-16MCHR are ROHS3 compliant and REACH unaffected. Moisture sensitivity level 3 applies to both, with a 168-hour dry storage window.

Q: Can these parts be used interchangeably in production?

A: Interchangeability is permitted only when the application circuit design operates within the 2.7V to 5.5V supply range. Designs requiring sub-2.7V operation must use ATMEGA169A-MCHR exclusively.

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