25LC128T-H/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC128T-H/SN is a 128Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIC surface mount configuration. This non-volatile memory device operates at 5 MHz clock frequency with a 2.5V to 5.5V supply voltage range and supports operating temperatures from -40°C to 150°C. The part is ROHS3 compliant and currently in active production status with 822 units in stock.

Equivalent and substitute parts are necessary when the original part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for enhanced performance characteristics such as higher clock frequencies or extended temperature ranges.

Key Parameters

Parameter	Value
Memory Size	128Kbit
Memory Organization	16K x 8
Memory Interface	SPI
Clock Frequency	5 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 150°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 25LC128T-H/SN is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 128Kbit (mandatory match)
Memory Organization: 16K x 8 (mandatory match)
Memory Interface: SPI (mandatory match)
Package Type: 8-SOIC with 0.154" width (mandatory match for direct PCB compatibility)
Mounting Type: Surface Mount (mandatory match)

Performance Enhancement Parameters (substitution allowed):

Clock Frequency: Equal to or greater than 5 MHz
Write Cycle Time: Equal to or less than 6ms
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Must encompass or exceed -40°C ~ 150°C

Substitute parts are grouped into two categories: direct equivalents with identical electrical specifications and alternative manufacturers offering enhanced performance characteristics while maintaining core functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status	Inventory
25LC128T-H/SN	Microchip Technology	128Kbit	5 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 150°C	8-SOIC (0.154")	Active	822 Pcs
25LC128-H/SN	Microchip Technology	128Kbit	5 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 150°C	8-SOIC (0.154")	Active	963 Pcs
AT25128B-SSHL-B	Microchip Technology	128Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154")	Active	7080 Pcs
AT25128B-SSHL-T	Microchip Technology	128Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154")	Active	26000 Pcs
BR25G128F-3GE2	Rohm Semiconductor	128Kbit	20 MHz	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.173")	Active	3146 Pcs
BR25G128FJ-3GE2	Rohm Semiconductor	128Kbit	20 MHz	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154")	Active	1476 Pcs
BR25H128F-2CE2	Rohm Semiconductor	128Kbit	10 MHz	4ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC (0.173")	Active	773 Pcs
BR25H128F-2LBH2	Rohm Semiconductor	128Kbit	10 MHz	4ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC (0.173")	Active	917 Pcs
BR25S128F-WE2	Rohm Semiconductor	128Kbit	20 MHz	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.173")	Active	3800 Pcs
CAT25128VI-G	onsemi	128Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154")	Obsolete	10392 Pcs
CAT25128VI-GT3	onsemi	128Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154")	Active	35300 Pcs

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): The 25LC128-H/SN from Microchip Technology is a direct equivalent with matching electrical and thermal specifications. This part differs only in packaging format (Tube versus Tape & Reel) and is recommended as the primary substitute when the original part becomes unavailable. Both parts maintain ROHS3 compliance and identical performance characteristics.

Enhanced Performance Substitutes (Same Package, Improved Specifications): The AT25128B-SSHL-T and CAT25128VI-GT3 offer higher clock frequency (20 MHz versus 5 MHz) and faster write cycle time (5ms versus 6ms) while maintaining the identical 8-SOIC (0.154") package footprint. These parts are suitable for applications where the original 5 MHz specification is not a limiting factor and where improved performance is beneficial. Both are ROHS3 compliant and in active production status with substantial inventory availability.

Alternative Package Substitutes (Enhanced Specifications, Different Package Width): The Rohm Semiconductor BR25G128F-3GE2, BR25G128FJ-3GE2, BR25H128F-2CE2, BR25H128F-2LBH2, and BR25S128F-WE2 provide equivalent or enhanced performance but feature 8-SOIC packages with 0.173" width instead of 0.154". These parts require PCB layout verification for mechanical compatibility. The BR25H128F series maintains the 2.5V ~ 5.5V supply voltage range and extends the operating temperature to -40°C ~ 125°C, providing broader environmental compatibility.

Obsolete Status Consideration: The CAT25128VI-G from onsemi is marked as obsolete product status. While substantial inventory is available, this part should be considered only for legacy system maintenance or when long-term supply is not a requirement. The active-status equivalent CAT25128VI-GT3 is the recommended alternative.

Frequently Asked Questions (FAQ)

Q: Can the 25LC128T-H/SN be replaced with the AT25128B-SSHL-T? A: Yes. Both parts maintain 128Kbit capacity, 16K x 8 organization, SPI interface, and identical 8-SOIC (0.154") package dimensions. The AT25128B-SSHL-T operates at 20 MHz (versus 5 MHz) with 5ms write cycle time (versus 6ms), representing performance enhancement. The operating temperature range differs: AT25128B-SSHL-T operates -40°C to 85°C versus the original -40°C to 150°C. Verify application temperature requirements before substitution.

Q: What is the difference between 25LC128-H/SN and 25LC128T-H/SN? A: Both parts are manufactured by Microchip Technology with identical electrical specifications, memory organization, and package type. The primary difference is packaging format: 25LC128-H/SN is supplied in Tube packaging, while 25LC128T-H/SN is supplied in Tape & Reel format. Electrical and functional performance are equivalent.

Q: Are Rohm Semiconductor BR25 series parts compatible with the 25LC128T-H/SN? A: Rohm BR25 series parts provide equivalent memory capacity and SPI interface but feature 8-SOIC packages with 0.173" width instead of 0.154". The BR25G128FJ-3GE2 maintains the 0.154" width and is mechanically compatible. Other BR25 variants require PCB layout verification for mechanical fit. All BR25 parts are ROHS3 compliant and in active production status.

Q: Can I use CAT25128VI-GT3 as a substitute? A: Yes. The CAT25128VI-GT3 from onsemi is functionally equivalent with identical 8-SOIC (0.154") package dimensions, 128Kbit capacity, and SPI interface. It operates at 20 MHz with 5ms write cycle time, providing performance enhancement over the original 5 MHz specification. The part is ROHS3 compliant and in active production status with high inventory availability.

Q: What should I consider when selecting between Microchip and onsemi substitutes? A: Both manufacturers provide ROHS3-compliant parts with identical package footprints. Selection should be based on supply chain availability, inventory levels, and application-specific performance requirements. The AT25128B-SSHL-T offers the highest inventory availability (26000 units) among active-status direct package equivalents. CAT25128VI-GT3 provides comparable performance with substantial inventory (35300 units).

Q: Are there temperature-rated variants available? A: The Rohm BR25H128F series extends the operating temperature range to -40°C ~ 125°C, providing broader environmental compatibility compared to the original -40°C ~ 150°C specification. The BR25H128F-2CE2 includes AEC-Q100 automotive qualification. These parts maintain 2.5V ~ 5.5V supply voltage compatibility with the original specification.

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