AT25128A-10PU-2.7 Equivalent & Substitute Parts

Part Overview

The AT25128A-10PU-2.7 is a 128Kbit EEPROM memory IC with SPI interface operating at 20 MHz, manufactured by Microchip Technology in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides non-volatile memory storage suitable for embedded systems requiring serial peripheral interface communication.

Key Parameters

Parameter	Value
Memory Size	128Kbit
Memory Organization	16K x 8
Memory Interface	SPI
Clock Frequency	20 MHz
Voltage Supply Range	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Write Cycle Time	5ms
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the AT25128A-10PU-2.7 is determined by the following critical parameters:

Memory Capacity: 128Kbit with 16K x 8 organization (non-negotiable)
Interface Protocol: SPI serial communication (required for circuit compatibility)
Package Format: 8-DIP through-hole (mechanical and electrical compatibility)
Supply Voltage Compatibility: Minimum 2.7V support required
Write Cycle Time: 5ms specification must be met or exceeded
Operating Temperature Range: Must support -40°C ~ 85°C minimum

The substitute parts listed below meet these core requirements while offering active product status and improved availability compared to the obsolete AT25128A-10PU-2.7.

Parameter Comparison

Parameter	AT25128A-10PU-2.7	25AA128-I/P	25LC128-E/P	25LC128-I/P
Memory Size	128Kbit	128Kbit	128Kbit	128Kbit
Memory Organization	16K x 8	16K x 8	16K x 8	16K x 8
Memory Interface	SPI	SPI	SPI	SPI
Clock Frequency	20 MHz	10 MHz	10 MHz	10 MHz
Voltage Supply Range	2.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Write Cycle Time	5ms	5ms	5ms	5ms
Package Type	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are manufactured by Microchip Technology and maintain ROHS3 compliance and REACH unaffected status consistent with the original AT25128A-10PU-2.7.

25AA128-I/P: This part offers the widest supply voltage range (1.8V ~ 5.5V) and maintains identical operating temperature specifications. Clock frequency is reduced to 10 MHz, which is acceptable for applications not requiring the 20 MHz performance of the original part. Active product status ensures long-term availability.

25LC128-E/P: This manufacturer-recommended substitute extends the operating temperature range to -40°C ~ 125°C, providing enhanced thermal performance. Supply voltage minimum is 2.5V, which remains compatible with the original 2.7V minimum specification. Clock frequency is 10 MHz. Active product status and higher inventory levels support production continuity.

25LC128-I/P: This manufacturer-recommended substitute maintains the original operating temperature range (-40°C ~ 85°C) and offers supply voltage compatibility at 2.5V ~ 5.5V. Clock frequency is 10 MHz. Active product status ensures availability for ongoing applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 10 MHz clock frequency in place of the 20 MHz AT25128A-10PU-2.7?

A: Yes, if your circuit design does not require 20 MHz SPI communication speed. The 10 MHz substitute parts are fully compatible with the same SPI protocol and memory organization. Verify that your application's timing requirements are met at the lower clock frequency.

Q: What is the minimum supply voltage I need to support for all substitute options?

A: The 25LC128-E/P and 25LC128-I/P require minimum 2.5V supply voltage. The 25AA128-I/P supports 1.8V minimum. If your design operates at 2.7V or higher, all three substitutes are compatible with the original AT25128A-10PU-2.7 supply specification.

Q: Are all substitute parts available in the same 8-DIP package?

A: Yes. All substitute parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct mechanical and electrical compatibility with existing PCB layouts designed for the AT25128A-10PU-2.7.

Q: Which substitute part should I select for new designs?

A: Selection depends on specific application requirements. The 25LC128-E/P offers the widest operating temperature range (-40°C ~ 125°C) and is manufacturer-recommended. The 25AA128-I/P provides the lowest minimum supply voltage (1.8V). The 25LC128-I/P maintains the original temperature range with active product status.

Q: Do all substitute parts maintain the same write cycle time?

A: Yes. All substitute parts maintain the 5ms write cycle time specification, ensuring equivalent performance for memory write operations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message