25LC128XT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC128XT-E/ST is a 128Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 10 MHz clock frequency with a 5ms write cycle time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is ROHS3 compliant and currently in active product status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical specifications to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value
Memory Size	128Kbit
Memory Organization	16K x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Voltage - Supply	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Write Cycle Time - Word, Page	5ms
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC128XT-E/ST are grouped based on the following substitution criteria:

Core Matching Parameters:

Memory Size: 128Kbit
Memory Organization: 16K x 8
Memory Interface: SPI
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variations:

Clock Frequency: 10 MHz or higher (20 MHz acceptable)
Voltage - Supply: Range must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Range must encompass or exceed -40°C ~ 125°C
Write Cycle Time: 4ms or 5ms (faster or equal acceptable)
Product Status: Active or Obsolete (with inventory availability noted)
Packaging Format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or Tube

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage - Supply	Operating Temperature	Write Cycle Time	Package / Case	Product Status	Inventory (Pcs)
25LC128XT-E/ST	Microchip Technology	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Active	815
AT25128B-XHL-B	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active	5700
AT25128B-XHL-T	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active	7108
CAT25128YI-G	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Obsolete	939
CAT25128YI-GT3	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active	6804
CAV25128YE-GT3	onsemi	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Active	3762
M95128-DRDW3TP/K	STMicroelectronics	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Active	7448
M95128-DWDW4TP/K	STMicroelectronics	128Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	Active	7574
M95128-RDW6TP	STMicroelectronics	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active	16114

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

AT25128B-XHL-B and AT25128B-XHL-T are direct functional equivalents from Microchip Technology with verified programmability status and active product status. Both support higher clock frequency (20 MHz) and lower minimum supply voltage (1.8V), providing enhanced performance margins. Operating temperature range is reduced to -40°C ~ 85°C, which is acceptable for most commercial and industrial applications.

CAV25128YE-GT3 from onsemi matches the original part's clock frequency (10 MHz), supply voltage range (2.5V ~ 5.5V), and operating temperature range (-40°C ~ 125°C) with AEC-Q100 automotive qualification. This part is suitable for applications requiring extended temperature operation and automotive-grade reliability.

Secondary Substitutes (Conditional Compatibility):

M95128-DRDW3TP/K and M95128-DWDW4TP/K from STMicroelectronics offer faster write cycle times (4ms versus 5ms) and AEC-Q100 automotive qualification. M95128-DRDW3TP/K supports the full operating temperature range (-40°C ~ 125°C) with 1.8V minimum supply voltage. M95128-DWDW4TP/K extends the upper operating temperature to 145°C with 2.5V minimum supply voltage, suitable for high-temperature automotive and industrial applications.

M95128-RDW6TP from STMicroelectronics is compatible for applications not requiring extended temperature operation, with operating range -40°C ~ 85°C and 1.8V minimum supply voltage.

CAT25128YI-GT3 from onsemi is an active product with matching electrical specifications but reduced operating temperature range (-40°C ~ 85°C). CAT25128YI-G is obsolete and should be avoided for new designs despite inventory availability.

Packaging Considerations:

Substitutes are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube packaging formats. Selection should align with assembly process requirements and volume specifications.

Frequently Asked Questions (FAQ)

Q: Can AT25128B-XHL-B replace 25LC128XT-E/ST in all applications?

A: AT25128B-XHL-B is functionally compatible for applications operating within -40°C ~ 85°C temperature range. The original part supports -40°C ~ 125°C. If your application requires operation above 85°C, use CAV25128YE-GT3 or M95128-DRDW3TP/K instead.

Q: What is the difference between CAT25128YI-GT3 and CAT25128YI-G?

A: Both parts have identical electrical specifications. CAT25128YI-G is obsolete and no longer recommended for new designs. CAT25128YI-GT3 is active and should be selected for new applications.

Q: Are M95128 parts suitable for automotive applications?

A: M95128-DRDW3TP/K and M95128-DWDW4TP/K carry AEC-Q100 automotive qualification. M95128-RDW6TP does not have automotive qualification. Verify specific automotive requirements before selection.

Q: What is the minimum supply voltage requirement for substitutes?

A: The original 25LC128XT-E/ST requires 2.5V minimum. Substitutes AT25128B-XHL-B, AT25128B-XHL-T, M95128-DRDW3TP/K, and M95128-RDW6TP support 1.8V minimum, providing greater flexibility in low-voltage applications. CAV25128YE-GT3 and M95128-DWDW4TP/K maintain 2.5V minimum.

Q: How do clock frequency differences affect substitution?

A: The original part operates at 10 MHz. All substitute parts operate at 10 MHz or higher (20 MHz). Higher clock frequency is backward compatible and does not affect functionality in applications designed for 10 MHz operation.

Q: What packaging formats are available for the substitute parts?

A: Substitutes are supplied in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or Tube formats. Verify packaging compatibility with your assembly equipment and procurement requirements.

Q: Can I use M95128-DWDW4TP/K in applications requiring extended temperature operation?

A: Yes. M95128-DWDW4TP/K supports -40°C ~ 145°C operating temperature, exceeding the original part's -40°C ~ 125°C range. This part is suitable for high-temperature industrial and automotive applications.

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