ATMEGA88-20PI Equivalent & Substitute Parts

Part Overview

The ATMEGA88-20PI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 1KB RAM, and 512 bytes EEPROM. This device operates at 20MHz with a supply voltage range of 2.7V to 5.5V and is housed in a 28-PDIP package. The ATMEGA88-20PI is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	20MHz
Program Memory Size	8KB (4K x 16)
Program Memory Type	FLASH
RAM Size	1K x 8
EEPROM Size	512 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	23
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)
Package / Case	28-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the ATMEGA88-20PI is determined by strict equivalence across the following critical parameters: core processor architecture (AVR), core size (8-Bit), program memory capacity (8KB FLASH), RAM capacity (1K x 8), EEPROM capacity (512 x 8), I/O count (23), peripheral set (Brown-out Detect/Reset, POR, PWM, WDT), connectivity options (I2C, SPI, UART/USART), data converter specification (A/D 6x10b), package type (28-DIP), and mounting method (Through Hole).

Substitute parts must maintain identical or compatible supply voltage ranges and operating temperature specifications. The following parts meet these criteria:

ATMEGA88A-PU (MFR Recommended Substitute)
ATMEGA88P-20PU (Parametric Equivalent)

Parameter Comparison

Parameter	ATMEGA88-20PI	ATMEGA88A-PU	ATMEGA88P-20PU
Manufacturer	Microchip Technology	Microchip Technology	Atmel
Core Processor	AVR	AVR	AVR
Core Size	8-Bit	8-Bit	8-Bit
Speed	20MHz	20MHz	20MHz
Program Memory Size	8KB (4K x 16)	8KB (4K x 16)	8KB (4K x 16)
RAM Size	1K x 8	1K x 8	1K x 8
EEPROM Size	512 x 8	512 x 8	512 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	1.8V ~ 5.5V	2.7V ~ 5.5V
Number of I/O	23	23	23
Data Converters	A/D 6x10b	A/D 6x10b	A/D 6x10b
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	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)	-40°C ~ 85°C (TA)
Package / Case	28-DIP (0.300", 7.62mm)	28-DIP (0.300", 7.62mm)	28-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

ATMEGA88A-PU is the manufacturer-recommended substitute for the obsolete ATMEGA88-20PI. This part maintains full functional and electrical equivalence across all critical parameters while offering the advantage of active product status and ROHS3 compliance. The ATMEGA88A-PU features an extended minimum supply voltage specification (1.8V minimum versus 2.7V), providing additional operational flexibility in low-voltage applications.

ATMEGA88P-20PU serves as a parametric equivalent, maintaining identical electrical and functional specifications including the original 2.7V minimum supply voltage. This part is also in active production status.

Both substitute parts are housed in the same 28-DIP through-hole package, ensuring direct mechanical and electrical compatibility with existing PCB designs. Selection between ATMEGA88A-PU and ATMEGA88P-20PU should be based on supply voltage requirements and compliance certification needs for the target application.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA88A-PU directly replace ATMEGA88-20PI in existing designs?

A: Yes. ATMEGA88A-PU maintains identical core architecture, memory configuration, I/O count, peripheral set, and package type. The extended minimum supply voltage (1.8V) of ATMEGA88A-PU is backward-compatible with designs specified for 2.7V minimum operation.

Q: What is the primary difference between ATMEGA88A-PU and ATMEGA88P-20PU?

A: Both parts are functionally equivalent. ATMEGA88A-PU is the manufacturer-recommended substitute with ROHS3 compliance. ATMEGA88P-20PU maintains the original 2.7V minimum supply voltage specification. Selection depends on compliance requirements and supply voltage constraints.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts use the 28-DIP (0.300", 7.62mm) through-hole package with identical pinout and mechanical dimensions.

Q: Why is the ATMEGA88-20PI classified as obsolete?

A: The ATMEGA88-20PI has been superseded by newer variants in the ATmega series. ATMEGA88A-PU and ATMEGA88P-20PU represent the current active alternatives.

Q: What compliance certifications apply to substitute parts?

A: ATMEGA88A-PU is ROHS3 compliant. Both substitute parts are REACH Unaffected and carry EAR99 export classification.

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