ATMEGA168PA-MMH Equivalent & Substitute Parts

Part Overview

The ATMEGA168PA-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 widely used in consumer electronics, industrial control, and IoT applications. Identifying equivalent and substitute parts is essential for supply chain continuity, cost optimization, and design flexibility when the primary part becomes unavailable or when alternative sourcing is required.

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	28-VQFN (4x4)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ATMEGA168PA-MMH is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part ATMEGA168A-MMH qualifies as a direct equivalent based on the following criteria:

Core Substitution Parameters:

Identical core processor architecture (AVR)
Matching core size (8-Bit)
Identical clock speed (20MHz)
Identical program memory capacity and type (16KB FLASH)
Identical RAM and EEPROM sizes (1K x 8 and 512 x 8 respectively)
Matching voltage supply range (1.8V ~ 5.5V)
Identical I/O count (23 pins)
Identical data converter specification (A/D 8x10b)
Matching connectivity interfaces (I2C, SPI, UART/USART)
Identical peripheral set (Brown-out Detect/Reset, POR, PWM, WDT)
Identical oscillator type (Internal)
Matching operating temperature range (-40°C ~ 85°C)
Identical package form factor (28-VQFN 4x4)
Identical mounting type (Surface Mount)

The ATMEGA168A-MMH maintains full functional and pin compatibility with the ATMEGA168PA-MMH, enabling direct substitution in existing designs without circuit modification.

Parameter Comparison

Parameter	ATMEGA168PA-MMH	ATMEGA168A-MMH	Match
Manufacturer	Microchip Technology	Atmel	Different Manufacturer
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	28-VQFN (4x4)	28-VQFN (4x4)	✓
Product Status	Active	Active	✓
ECCN	EAR99	EAR99	✓
HTSUS	8542.31.0001	8542.31.0001	✓

Engineering Selection Recommendations

Both the ATMEGA168PA-MMH and ATMEGA168A-MMH are active production devices with identical electrical specifications and package configurations. The ATMEGA168A-MMH is a direct functional equivalent suitable for substitution in applications currently using the ATMEGA168PA-MMH.

Selection between these parts should be based on:

Supply Chain Availability: Choose the part with better inventory status and lead time for your procurement timeline.

Compliance Requirements: Both parts carry EAR99 ECCN classification and HTSUS code 8542.31.0001, ensuring equivalent regulatory treatment. Verify RoHS compliance status with your specific supplier if environmental regulations apply to your application.

Manufacturer Preference: The ATMEGA168PA-MMH is manufactured by Microchip Technology, while the ATMEGA168A-MMH is manufactured by Atmel. Both are established semiconductor manufacturers with established quality and support infrastructure.

Cost Optimization: Evaluate unit pricing and volume discounts from available suppliers to determine the most cost-effective option for your production requirements.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA168A-MMH be used as a direct replacement for the ATMEGA168PA-MMH?

A: Yes. The ATMEGA168A-MMH is a direct functional equivalent with identical electrical specifications, memory configuration, I/O count, peripheral set, and package form factor. No circuit modifications are required for substitution.

Q: Are there any differences in pin configuration between these parts?

A: No. Both parts use the 28-VQFN (4x4) package with identical pin assignments, voltage requirements, and signal definitions.

Q: Do both parts support the same operating voltage range?

A: Yes. Both the ATMEGA168PA-MMH and ATMEGA168A-MMH operate across the identical supply voltage range of 1.8V to 5.5V.

Q: Are the memory specifications identical?

A: Yes. Both parts feature 16KB of Flash program memory, 1KB of RAM, and 512 bytes of EEPROM with identical access characteristics.

Q: What is the maximum operating frequency for both parts?

A: Both parts operate at a maximum clock speed of 20MHz with internal oscillator support.

Q: Are both parts RoHS compliant?

A: The ATMEGA168PA-MMH is specified as ROHS3 compliant. Verify the RoHS status of the ATMEGA168A-MMH with your supplier, as this information was not provided in the available specifications.

Q: Can I use these parts interchangeably in production?

A: Yes, provided that both parts meet your specific compliance and quality requirements. Confirm supplier certifications and quality documentation before implementing substitution in production designs.

Q: What connectivity interfaces are supported?

A: Both parts support I2C, SPI, and UART/USART interfaces, enabling equivalent integration with external peripherals and communication systems.

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