Equivalent & Substitute Parts for 25LC256T-H/SN

Part Overview

The 25LC256T-H/SN is a 256Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 5 MHz with 8-SOIC surface mount packaging. This device is classified as Active product status and is ROHS3 compliant. Substitute parts are necessary when the original part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications are needed for system upgrades.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K 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 25LC256T-H/SN is determined by the following critical parameters: memory capacity (256Kbit), memory organization (32K x 8), SPI interface protocol, package form factor (8-SOIC with 0.154" width), surface mount mounting type, and voltage supply compatibility within the 2.5V to 5.5V range. Parts meeting these core electrical and mechanical specifications are functionally interchangeable. Secondary considerations include clock frequency (minimum 5 MHz required), write cycle time, operating temperature range, and packaging format (Tape & Reel, Tube, or Cut Tape). Parts with enhanced specifications such as higher clock frequency or wider voltage ranges remain compatible as they maintain backward compatibility with the original design requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Packaging Format	Product Status
25LC256T-H/SN	Microchip Technology	256Kbit	5 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 150°C	8-SOIC	Tape & Reel	Active
25LC256-H/SN	Microchip Technology	256Kbit	5 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 150°C	8-SOIC	Tube	Active
AT25256B-SSHL-B	Microchip Technology	256Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
AT25256B-SSHL-T	Microchip Technology	256Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
M95256-WMN6TP	STMicroelectronics	256Kbit	20 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
BR25G256F-3GE2	Rohm Semiconductor	256Kbit	20 MHz	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP	Tape & Reel	Active
BR25G256FJ-3GE2	Rohm Semiconductor	256Kbit	20 MHz	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Tape & Reel	Active
BR25S256F-WE2	Rohm Semiconductor	256Kbit	20 MHz	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP	Tape & Reel	Active
BR25S256FJ-WE2	Rohm Semiconductor	256Kbit	20 MHz	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Tape & Reel	Active
CAT25256VI-G	onsemi	256Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Not Specified	Obsolete
CAT25256VI-GT3	onsemi	256Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active

Engineering Selection Recommendations

For direct replacement with identical specifications and packaging, select 25LC256-H/SN, which differs only in packaging format (Tube instead of Tape & Reel). Both parts are manufactured by Microchip Technology and maintain Active product status with ROHS3 compliance.

For applications requiring enhanced performance, AT25256B-SSHL-T and AT25256B-SSHL-B offer doubled clock frequency (20 MHz versus 5 MHz) and reduced write cycle time (5ms versus 6ms), while maintaining 8-SOIC package compatibility. These parts are Microchip Technology products with Active status and ROHS3 compliance. The AT25256B series extends voltage supply range to 1.8V minimum, enabling operation in lower-power applications.

M95256-WMN6TP from STMicroelectronics provides equivalent performance to the AT25256B series with 20 MHz clock frequency and 5ms write cycle time. This part maintains the 2.5V to 5.5V voltage supply range of the original 25LC256T-H/SN and is available in Cut Tape & Digi-Reel packaging with Active product status and ROHS3 compliance.

Rohm Semiconductor alternatives (BR25G256F-3GE2, BR25G256FJ-3GE2, BR25S256F-WE2, BR25S256FJ-WE2) offer 20 MHz clock frequency and 5ms write cycle time with extended voltage supply ranges (1.6V to 1.7V minimum). These parts use 8-SOP or 8-SOP-J package variants with 0.173" or 0.154" width specifications. All Rohm parts maintain Active product status and ROHS3 compliance.

CAT25256VI-GT3 from onsemi provides equivalent electrical specifications to the Rohm alternatives with 20 MHz clock frequency, 5ms write cycle time, and 1.8V to 5.5V voltage supply range in standard 8-SOIC packaging. This part is available in Cut Tape & Digi-Reel format with Active product status and ROHS3 compliance. CAT25256VI-G is functionally equivalent but carries Obsolete product status and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can 25LC256-H/SN replace 25LC256T-H/SN directly?

A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications (256Kbit, 5 MHz SPI, 2.5V to 5.5V supply, 8-SOIC package). The difference is packaging format: 25LC256-H/SN uses Tube packaging while 25LC256T-H/SN uses Tape & Reel. Electrical and mechanical compatibility is complete.

Q: What is the primary difference between the original 25LC256T-H/SN and AT25256B-SSHL-T?

A: The AT25256B-SSHL-T operates at 20 MHz clock frequency with 5ms write cycle time, compared to the original 5 MHz and 6ms specifications. The AT25256B also supports lower minimum voltage (1.8V versus 2.5V). Both use 8-SOIC packaging and are fully compatible at the SPI interface level. The AT25256B is suitable for applications requiring faster memory access.

Q: Are Rohm Semiconductor BR25 series parts compatible with the 25LC256T-H/SN?

A: Rohm BR25 series parts (BR25G256F-3GE2, BR25S256F-WE2, and their -FJ variants) are electrically compatible as 256Kbit SPI EEPROM devices with 20 MHz clock frequency and 5ms write cycle time. Package compatibility depends on the specific variant: BR25G256F-3GE2 and BR25S256F-WE2 use 8-SOP packaging (0.173" width), while BR25G256FJ-3GE2 and BR25S256FJ-WE2 use 8-SOP-J packaging (0.154" width). The 0.154" width variants are mechanically compatible with standard 8-SOIC footprints. Verify PCB layout compatibility before substitution.

Q: Why is CAT25256VI-G listed as Obsolete?

A: CAT25256VI-G carries Obsolete product status, indicating it is no longer in active production. For new designs and ongoing production, CAT25256VI-GT3 should be selected instead. Both parts share identical electrical specifications but CAT25256VI-GT3 maintains Active status with confirmed availability.

Q: What voltage supply range considerations apply when selecting a substitute?

A: The original 25LC256T-H/SN operates from 2.5V to 5.5V. Substitute parts with lower minimum voltage specifications (1.6V to 1.8V) are backward compatible and can operate across the original voltage range. Parts with identical or higher minimum voltage specifications are direct replacements. Verify system power supply specifications match the selected part's voltage range.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel, Tube, and Cut Tape & Digi-Reel formats contain identical die and electrical characteristics. Packaging format selection is determined by manufacturing process requirements and inventory management practices. Electrical performance and SPI interface operation remain unchanged regardless of packaging format.

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