ATMEGA168A-MMH Equivalent & Substitute Parts

Part Overview

The ATMEGA168A-MMH is an 8-bit AVR microcontroller manufactured by Microchip Technology, designed for embedded applications requiring moderate processing capability and integrated peripherals. This device features 16KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM, operating at up to 20MHz with a supply voltage range of 1.8V to 5.5V. The part is currently in active production status and is ROHS3 compliant. Identifying equivalent substitute parts is essential for supply chain continuity, design flexibility, and procurement optimization when the primary part experiences availability constraints.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	20MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	FLASH
RAM Size	1K x 8
EEPROM Size	512 x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V
Number of I/O	23
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	28-VFQFN Exposed Pad
Supplier Device Package	28-VQFN (4x4)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

The ATMEGA168A-MMH has one parametric equivalent substitute: the ATMEGA168PA-MMH. This substitution is valid based on the following criteria:

Both parts share identical electrical specifications across all critical parameters: 8-bit AVR core processor, 20MHz maximum speed, 16KB FLASH program memory, 1KB RAM, 512 bytes EEPROM, 23 I/O pins, identical connectivity interfaces (I2C, SPI, UART/USART), and matching peripheral sets (Brown-out Detect/Reset, POR, PWM, WDT). Both devices operate within the same voltage supply range (1.8V ~ 5.5V) and support the same 8x10-bit analog-to-digital converter configuration. The mechanical specifications are identical: both use 28-VQFN (4x4) surface mount packaging with exposed pad, identical operating temperature range (-40°C ~ 85°C), and matching RoHS3 compliance and MSL ratings. The substitution is based strictly on parametric equivalence with no functional or performance differentiation between the two part numbers.

Parameter Comparison

Parameter	ATMEGA168A-MMH	ATMEGA168PA-MMH
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)
Program Memory Type	FLASH	FLASH
RAM Size	1K x 8	1K x 8
EEPROM Size	512 x 8	512 x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V
Number of I/O	23	23
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Oscillator Type	Internal	Internal
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	28-VFQFN Exposed Pad	28-VFQFN Exposed Pad
Supplier Device Package	28-VQFN (4x4)	28-VQFN (4x4)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active

Engineering Selection Recommendations

Both the ATMEGA168A-MMH and ATMEGA168PA-MMH are active production devices from Microchip Technology with identical ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on availability and procurement lead times, as they are parametrically equivalent across all electrical, mechanical, and environmental specifications. Both parts meet the same regulatory and environmental compliance requirements (ROHS3, MSL 3, ECCN EAR99, HTSUS 8542.31.0001). Design implementations using either part number will function identically within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA168A-MMH and ATMEGA168PA-MMH pin-compatible? A: Yes. Both devices use the 28-VQFN (4x4) surface mount package with identical pinout, mechanical dimensions, and exposed pad configuration. PCB layouts designed for one part number are directly compatible with the other.

Q: Can I substitute ATMEGA168PA-MMH for ATMEGA168A-MMH in production? A: Yes. The parts are parametrically equivalent across all specified electrical and mechanical parameters. No design modifications are required for substitution.

Q: Do these parts have different performance characteristics? A: No. Both parts operate at identical maximum speed (20MHz), support the same memory configuration (16KB FLASH, 1KB RAM, 512 bytes EEPROM), and provide identical peripheral functionality and I/O count.

Q: Are there any compliance differences between these part numbers? A: No. Both parts carry identical ROHS3 compliance, REACH unaffected status, MSL rating (3), and regulatory classifications (ECCN EAR99, HTSUS 8542.31.0001).

Q: What is the difference between ATMEGA168A and ATMEGA168PA? A: The provided specifications indicate these are parametrically equivalent variants. The suffix designations reflect Microchip's product line differentiation, but no functional or electrical differences are specified in the available parameters.

Q: Can I use either part for new designs? A: Yes. Both parts are in active production status and are suitable for new design implementations. Selection should be based on current availability and supply chain considerations.

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