ATMEGA164PA-MCH Equivalent & Substitute Parts

Part Overview

The ATMEGA164PA-MCH 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 across a wide voltage range of 1.8V to 5.5V. The part is currently in active production status with 849 units available in inventory. Identifying equivalent and substitute parts is essential for supply chain continuity, design flexibility, and procurement optimization 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 Range	1.8V ~ 5.5V
Number of I/O	32
Connectivity	I2C, SPI, UART/USART
Data Converters	A/D 8x10b
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C
Package	44-VQFN Dual Rows, Exposed Pad
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

The ATMEGA164PA-MCH belongs to the AVR ATmega family and shares identical electrical and mechanical specifications with the ATMEGA164A-MCH. Substitution between these parts is valid based on the following criteria:

Identical core processor architecture (AVR)
Matching core size (8-Bit) and clock speed (20MHz)
Identical program memory configuration (16KB FLASH)
Matching RAM (1K x 8) and EEPROM (512 x 8) capacity
Identical voltage supply range (1.8V ~ 5.5V)
Matching I/O count (32 pins)
Identical connectivity interfaces (I2C, SPI, UART/USART)
Matching peripheral feature set (Brown-out Detect/Reset, POR, PWM, WDT)
Identical data converter specifications (A/D 8x10b)
Identical operating temperature range (-40°C ~ 85°C)
Identical package specification (44-VQFN Dual Rows, Exposed Pad)
Identical mounting type (Surface Mount)

Both parts are manufactured by Microchip Technology and maintain active product status, ensuring long-term availability and support.

Parameter Comparison

Parameter	ATMEGA164PA-MCH	ATMEGA164A-MCH	Match
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 Range	1.8V ~ 5.5V	1.8V ~ 5.5V	✓
Number of I/O	32	32	✓
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART	✓
Data Converters	A/D 8x10b	A/D 8x10b	✓
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	✓
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	✓
Package	44-VQFN Dual Rows, Exposed Pad	44-VQFN Dual Rows, Exposed Pad	✓
Mounting Type	Surface Mount	Surface Mount	✓
Product Status	Active	Active	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
MSL Rating	3 (168 Hours)	3 (168 Hours)	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓

Engineering Selection Recommendations

Both the ATMEGA164PA-MCH and ATMEGA164A-MCH are functionally equivalent devices suitable for direct substitution in embedded applications. Selection between these parts should be based on the following factors:

Inventory availability: ATMEGA164A-MCH currently has 1739 units in stock compared to 849 units for ATMEGA164PA-MCH, providing greater supply assurance
Both parts maintain active product status, ensuring continued manufacturer support and availability
Both parts comply with ROHS3 standards and are REACH unaffected, meeting environmental and regulatory requirements
Both parts carry identical MSL ratings (3, 168 Hours), requiring equivalent moisture control during storage and handling
Both parts are classified under identical ECCN (EAR99) and HTSUS (8542.31.0001) codes for export and tariff purposes

No technical differentiation exists between these parts based on the provided specifications. Selection can proceed based on procurement, logistics, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA164A-MCH be used as a direct replacement for ATMEGA164PA-MCH?

A: Yes. Both parts are parametrically identical across all electrical and mechanical specifications, including processor architecture, memory configuration, I/O count, connectivity interfaces, and package format. Direct substitution is supported without design modifications.

Q: Are there any differences in the 44-VQFN package between these parts?

A: No. Both parts use the identical 44-VQFN Dual Rows package with exposed pad. Pin assignments, pad layout, and mechanical dimensions are identical, ensuring compatibility with the same PCB footprint and assembly process.

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

A: Yes. Both ATMEGA164PA-MCH and ATMEGA164A-MCH operate across the identical voltage supply range of 1.8V to 5.5V, allowing use in the same circuit designs without modification.

Q: Are there compliance or certification differences between these parts?

A: No. Both parts carry identical RoHS3 compliance status, REACH unaffected designation, and MSL ratings. They meet the same environmental and regulatory requirements for industrial and commercial applications.

Q: What is the significance of the "PA" and "A" designations in the part numbers?

A: The designations reflect internal Microchip Technology product line classifications. From an engineering perspective, these parts are functionally equivalent with no performance or specification differences relevant to circuit design or application implementation.

Q: Can I mix ATMEGA164PA-MCH and ATMEGA164A-MCH in the same production batch?

A: Yes. Since both parts are parametrically identical and use the same package, they can be used interchangeably in production without affecting assembly, testing, or functional performance.

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