25LC128T-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC128T-E/ST is a 128Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in an 8-TSSOP surface mount package. 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 production status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters 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
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC128T-E/ST are classified into two categories based on electrical parameter compatibility:

Category 1: Direct Electrical Equivalents (Identical Operating Parameters) Parts that match all key electrical specifications including 10 MHz clock frequency, 2.5V–5.5V supply voltage range, and -40°C to 125°C operating temperature. These parts provide full functional interchangeability without circuit modification.

Category 2: Enhanced Performance Substitutes (Higher Clock Frequency, Reduced Temperature Range) Parts that operate at 20 MHz clock frequency with reduced supply voltage floor (1.6V–1.8V minimum) and narrower operating temperature range (-40°C to 85°C). These parts are electrically compatible in applications where the 25LC128T-E/ST operates, as they exceed the original specifications. Write cycle time remains at 4–5ms.

All substitute parts maintain 128Kbit capacity, 16K x 8 organization, SPI interface, 8-TSSOP package footprint, and ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Supply Voltage	Operating Temperature	Write Cycle Time	Package	Product Status
25LC128T-E/ST	Microchip Technology	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Active
25LC128-E/ST	Microchip Technology	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Active
AT25128B-XHL-B	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
AT25128B-XHL-T	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
BR25G128FVT-3GE2	Rohm Semiconductor	128Kbit	20 MHz	1.6V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
BR25S128FV-WE2	ROHM Semiconductor	128Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-LSSOP	Not For New Designs
CAT25128YI-GT3	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
CAV25128YE-GT3	onsemi	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Active
M95128-DRDW3TP/K	STMicroelectronics	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Active
M95128-DWDW4TP/K	STMicroelectronics	128Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required): The 25LC128-E/ST and CAV25128YE-GT3 provide identical electrical specifications to the 25LC128T-E/ST. The 25LC128-E/ST differs only in packaging format (Tube vs. Tape & Reel). The CAV25128YE-GT3 is qualified to AEC-Q100 automotive standards and suitable for automotive applications requiring the same operating parameters.

For Enhanced Performance Applications: The AT25128B-XHL-B, AT25128B-XHL-T, BR25G128FVT-3GE2, CAT25128YI-GT3, and M95128-DRDW3TP/K operate at 20 MHz clock frequency, exceeding the 10 MHz specification of the 25LC128T-E/ST. These parts are suitable for applications where higher data transfer rates are beneficial. The M95128-DRDW3TP/K additionally supports the full -40°C to 125°C temperature range and includes AEC-Q100 automotive qualification.

For Extended Temperature Range Applications: The M95128-DWDW4TP/K extends the operating temperature to -40°C to 145°C, suitable for high-temperature industrial and automotive applications. This part maintains 2.5V–5.5V supply voltage compatibility with the original specification.

Parts Not Recommended for New Designs: The BR25S128FV-WE2 carries a "Not For New Designs" status and should be avoided in new circuit development. The CAT25128YI-G is obsolete and should not be selected for production applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz substitute part in a circuit designed for the 25LC128T-E/ST 10 MHz device? A: Yes. Higher clock frequency parts (AT25128B-XHL-B, AT25128B-XHL-T, BR25G128FVT-3GE2, CAT25128YI-GT3, M95128-DRDW3TP/K, M95128-DWDW4TP/K) are backward compatible. The circuit will operate correctly at the original 10 MHz clock speed. No firmware or circuit modification is required.

Q: What is the difference between 25LC128T-E/ST and 25LC128-E/ST? A: Both parts are electrically identical with matching specifications. The difference is packaging format: 25LC128T-E/ST is supplied in Tape & Reel format, while 25LC128-E/ST is supplied in Tube format. Select based on your procurement and assembly requirements.

Q: Are the STMicroelectronics M95128 parts suitable replacements? A: Yes. The M95128-DRDW3TP/K and M95128-DWDW4TP/K are fully compatible substitutes. Both maintain SPI interface, 128Kbit capacity, and 8-TSSOP package. The M95128-DRDW3TP/K matches the full temperature range (-40°C to 125°C), while M95128-DWDW4TP/K extends to 145°C. Write cycle time is 4ms, which is faster than the original 5ms specification.

Q: Can I use BR25S128FV-WE2 as a substitute? A: While electrically compatible, BR25S128FV-WE2 is marked "Not For New Designs" and carries limited inventory (796 pcs). It is not recommended for new circuit development. Use BR25G128FVT-3GE2 instead, which is actively produced and has higher inventory availability.

Q: What supply voltage range should I verify when selecting a substitute? A: The 25LC128T-E/ST operates from 2.5V to 5.5V. Most 20 MHz substitutes have a lower minimum voltage (1.6V–1.8V), which is acceptable. Verify your circuit's actual supply voltage falls within the substitute part's specified range. The M95128-DWDW4TP/K maintains the 2.5V minimum, matching the original specification exactly.

Q: Are automotive-qualified parts available? A: Yes. The CAV25128YE-GT3 (onsemi) and M95128-DRDW3TP/K (STMicroelectronics) both carry AEC-Q100 qualification. The M95128-DWDW4TP/K also qualifies for automotive use with extended temperature range to 145°C.

Q: What is the package difference between 8-TSSOP and 8-LSSOP? A: Both are 8-pin surface mount packages with 0.173" width and 4.40mm body width. The BR25S128FV-WE2 uses 8-LSSOP (Leadless Small Outline Package), while most other substitutes use standard 8-TSSOP. Verify PCB footprint compatibility before selection, as these packages have different pin configurations.

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