ATMEGA164PA-PU Equivalent & Substitute Parts

Part Overview

The ATMEGA164PA-PU is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 16KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device integrates 32 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and operates at up to 20MHz with a supply voltage range of 1.8V to 5.5V. The ATMEGA164PA-PU is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

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
Number of I/O	32
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x10b
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ATMEGA164PA-PU is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR 8-bit processor
Memory Configuration: 16KB FLASH, 1KB RAM, 512 bytes EEPROM
Clock Speed: 20MHz maximum operating frequency
I/O Count: 32 I/O pins
Interface Protocols: I2C, SPI, UART/USART support
Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
Analog Capability: 8-channel 10-bit A/D converter
Supply Voltage Range: 1.8V to 5.5V
Package Type: 40-pin DIP through-hole configuration
Compliance: ROHS3 compliant, MSL Level 1

The ATMEGA164A-PU meets all these criteria and is classified as a parametric equivalent to the ATMEGA164PA-PU.

Parameter Comparison

Parameter	ATMEGA164PA-PU	ATMEGA164A-PU
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
Number of I/O	32	32
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x10b	A/D 8x10b
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V
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)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Obsolete

Engineering Selection Recommendations

Both the ATMEGA164PA-PU and ATMEGA164A-PU are classified as obsolete products. Selection between these parts should be based on availability and compliance requirements. Both devices maintain ROHS3 compliance and identical electrical and mechanical specifications, ensuring functional interchangeability in applications requiring 8-bit AVR microcontrollers with 16KB FLASH memory in 40-pin DIP packaging. Packaging format differs between the main part (standard packaging) and the substitute (tube packaging), which may affect procurement and handling procedures but does not impact electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA164PA-PU and ATMEGA164A-PU pin-for-pin compatible? A: Yes. Both devices use the 40-pin DIP package with identical pinout, voltage specifications, and I/O configuration. Direct socket substitution is supported.

Q: What is the difference between ATMEGA164PA-PU and ATMEGA164A-PU? A: The devices are parametrically equivalent across all electrical and functional specifications. The primary difference is packaging format: ATMEGA164PA-PU uses standard packaging while ATMEGA164A-PU is supplied in tube packaging.

Q: Can I use ATMEGA164A-PU as a direct replacement in existing designs? A: Yes. The ATMEGA164A-PU provides identical memory configuration, clock speed, I/O count, peripheral set, and voltage specifications. No design modifications are required for functional substitution.

Q: Are both parts ROHS3 compliant? A: Yes. Both ATMEGA164PA-PU and ATMEGA164A-PU are ROHS3 compliant with MSL Level 1 rating.

Q: What should I consider when selecting between these parts? A: Primary considerations are component availability and packaging requirements. Both parts are obsolete; selection should be based on current inventory status and procurement lead times. Packaging format (standard vs. tube) may affect handling and storage procedures.

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