ATMEGA48A-PU Equivalent & Substitute Parts

Part Overview

The ATMEGA48A-PU is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 4KB of FLASH program memory, 512 bytes of RAM, and 256 bytes of EEPROM. This device operates at up to 20MHz and supports multiple communication interfaces including I2C, SPI, and UART/USART. The ATMEGA48A-PU is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	20MHz
Program Memory Size	4KB (2K x 16)
Program Memory Type	FLASH
RAM Size	512 x 8
EEPROM Size	256 x 8
Number of I/O	23
Voltage Supply (Vcc/Vdd)	1.8V ~ 5.5V
Data Converters	A/D 6x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	28-DIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitution of the ATMEGA48A-PU is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 4KB FLASH, 512 bytes RAM, 256 bytes EEPROM
Operational Frequency: 20MHz maximum
I/O Count: 23 I/O pins
Voltage Range: 1.8V to 5.5V supply compatibility
Interface Protocols: I2C, SPI, UART/USART support
Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
Package Format: 28-DIP through-hole configuration
Temperature Range: -40°C to 85°C operation

The ATMEGA48PA-PU meets all these parameters identically, establishing it as a parametric equivalent. Substitution is valid when the replacement part maintains identical electrical specifications, memory organization, pin configuration, and functional capabilities.

Parameter Comparison

Parameter	ATMEGA48A-PU	ATMEGA48PA-PU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	4KB (2K x 16)	4KB (2K x 16)
Program Memory Type	FLASH	FLASH
RAM Size	512 x 8	512 x 8
EEPROM Size	256 x 8	256 x 8
Number of I/O	23	23
Voltage Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V
Data Converters	A/D 6x10b	A/D 6x10b
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)
Mounting Type	Through Hole	Through Hole
Package / Case	28-DIP (0.300", 7.62mm)	28-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ATMEGA48PA-PU is the direct parametric equivalent for the obsolete ATMEGA48A-PU. Both devices are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements. The primary distinction is product lifecycle status: the ATMEGA48A-PU is obsolete while the ATMEGA48PA-PU maintains active production status. For new designs or component replenishment, the ATMEGA48PA-PU is the appropriate selection, offering continued manufacturer support and supply chain availability. Both parts are functionally interchangeable at the electrical and mechanical level, with identical pinout, memory organization, and operational characteristics.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA48PA-PU directly replace the ATMEGA48A-PU in existing designs?

A: Yes. The ATMEGA48PA-PU is a parametric equivalent with identical core architecture, memory configuration, I/O count, voltage specifications, and 28-DIP package format. No circuit modifications are required for substitution.

Q: What is the primary reason for seeking a substitute for the ATMEGA48A-PU?

A: The ATMEGA48A-PU is classified as obsolete. The ATMEGA48PA-PU provides equivalent functionality with active product status and ongoing manufacturer support.

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

A: No. Both devices utilize the 28-DIP package with identical pinout and electrical characteristics. Direct socket compatibility is maintained.

Q: Do both parts support the same communication protocols?

A: Yes. Both the ATMEGA48A-PU and ATMEGA48PA-PU support I2C, SPI, and UART/USART interfaces with identical peripheral functionality.

Q: What is the operating temperature range for both devices?

A: Both parts operate across the identical temperature range of -40°C to 85°C (TA).

Q: Are there compliance or certification differences between the two parts?

A: No. Both devices are ROHS3 compliant and REACH unaffected, meeting identical regulatory standards.

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