ATMEGA164P-15AT Equivalent & Substitute Parts

Part Overview

The ATMEGA164P-15AT is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device integrates I2C, SPI, and UART/USART connectivity with integrated analog-to-digital conversion capabilities. The part is classified as Obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity.

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
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	32
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the ATMEGA164P-15AT is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 16KB FLASH, 1KB RAM, 512 bytes EEPROM
Clock Speed: 16MHz operation
I/O Count: 32 I/O pins
Connectivity Interfaces: I2C, SPI, UART/USART support
Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
Analog Capability: 8-channel 10-bit ADC
Package Format: 44-TQFP (10x10) surface mount
Supply Voltage Range: 2.7V ~ 5.5V
Environmental Compliance: ROHS3, MSL 3 rating

The ATMEGA16A-AUR meets all these parameters identically and serves as a direct parametric equivalent. The primary distinction is product status: ATMEGA164P-15AT is Obsolete, while ATMEGA16A-AUR is Active with verified programmability and significantly higher inventory availability.

Parameter Comparison

Parameter	ATMEGA164P-15AT	ATMEGA16A-AUR	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Core Processor	AVR	AVR	✓
Core Size	8-Bit	8-Bit	✓
Speed	16MHz	16MHz	✓
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)	✓
Program Memory Type	FLASH	FLASH	✓
EEPROM Size	512 x 8	512 x 8	✓
RAM Size	1K x 8	1K x 8	✓
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V	✓
Number of I/O	32	32	✓
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	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)	✓
Mounting Type	Surface Mount	Surface Mount	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
MSL Rating	3 (168 Hours)	3 (168 Hours)	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The ATMEGA16A-AUR is the direct substitute for ATMEGA164P-15AT applications. Selection is based on the following engineering criteria:

Compliance & Certification: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and environmental standards.

Product Lifecycle: ATMEGA164P-15AT is classified as Obsolete, creating supply chain risk for ongoing production. ATMEGA16A-AUR is Active with verified programmability and substantial inventory availability (1,000,099 units), ensuring production continuity.

Electrical & Functional Equivalence: All electrical parameters, memory configurations, clock speeds, I/O counts, connectivity interfaces, and peripheral sets are identical. Pin-for-pin compatibility is maintained in the 44-TQFP package.

Packaging & Handling: Both devices use identical 44-TQFP (10x10) surface mount packaging with MSL 3 moisture sensitivity ratings, requiring no changes to assembly or storage procedures.

For new designs or production transitions, ATMEGA16A-AUR is the appropriate selection. Existing designs using ATMEGA164P-15AT can transition to ATMEGA16A-AUR without firmware modification or PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA16A-AUR be used as a direct replacement for ATMEGA164P-15AT?

A: Yes. ATMEGA16A-AUR is a parametric equivalent with identical core architecture, memory configuration, clock speed, I/O count, connectivity interfaces, peripheral set, and package format. No design changes are required.

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

A: No. Both devices use the 44-TQFP (10x10) package with identical pin assignments. PCB layouts and schematics require no modification.

Q: Why is ATMEGA164P-15AT listed as Obsolete?

A: Product status reflects Microchip Technology's lifecycle classification. Obsolete status indicates the part is no longer in active production. ATMEGA16A-AUR remains in active production with full availability.

Q: What is the difference between ATMEGA164P-15AT and ATMEGA16A-AUR in terms of programmability?

A: ATMEGA164P-15AT programmability status is not verified. ATMEGA16A-AUR is verified as programmable through DiGi-Electronics. Both devices support standard AVR programming interfaces.

Q: Are moisture sensitivity levels identical?

A: Yes. Both parts carry MSL 3 rating (168 hours), requiring identical handling, storage, and reflow procedures.

Q: Can I use ATMEGA16A-AUR in automotive applications?

A: ATMEGA164P-15AT carries Automotive grade classification with AEC-Q100 qualification. ATMEGA16A-AUR specifications do not indicate automotive qualification. Application suitability depends on specific automotive requirements and qualification standards applicable to your design.

Q: What is the supply voltage range for both parts?

A: Both ATMEGA164P-15AT and ATMEGA16A-AUR operate across 2.7V to 5.5V supply voltage range, supporting both 3.3V and 5V system designs.

Q: Are there inventory considerations for component selection?

A: ATMEGA164P-15AT has 1,073 units in stock (Obsolete status). ATMEGA16A-AUR has 1,000,099 units available (Active status). For production continuity, ATMEGA16A-AUR is the recommended selection.

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