25LC256XT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC256XT-E/ST is a 256Kbit 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 2.5V to 5.5V supply voltage range and supports industrial temperature operation from -40°C to 125°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from different manufacturers that meet the same electrical and mechanical requirements.

Substiute Parts

25LC256XT-E/ST

Microchip TechnologyIn Stock: 114025LC256XT-E/ST Datasheet

Current PartRFQ

25LC256X-E/ST

Microchip TechnologyIn Stock: 136625LC256X-E/ST Datasheet

DirectRFQ

AT25256B-XHL-B

Microchip TechnologyIn Stock: 2184AT25256B-XHL-B Datasheet

MFR RecommendedRFQ

CAV25256YE-GT3

onsemiIn Stock: 3329CAV25256YE-GT3 Datasheet

MFR RecommendedRFQ

M95256-DFDW6TP

STMicroelectronicsIn Stock: 2904M95256-DFDW6TP Datasheet

MFR RecommendedRFQ

M95256-DRDW3TP/K

STMicroelectronicsIn Stock: 2174M95256-DRDW3TP/K Datasheet

MFR RecommendedRFQ

M95256-DWDW4TP/K

STMicroelectronicsIn Stock: 4260M95256-DWDW4TP/K Datasheet

MFR RecommendedRFQ

M95256-WDW6TP

STMicroelectronicsIn Stock: 31073M95256-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 25LC256XT-E/ST is determined by strict equivalence in the following parameters: 256Kbit memory capacity, 32K x 8 memory organization, SPI interface protocol, 8-TSSOP package footprint, and surface mount mounting type. All substitute parts must maintain compatibility with the 2.5V to 5.5V supply voltage range and -40°C to 125°C operating temperature range, or operate within a superset of these ranges.

Clock frequency, write cycle time, and packaging format (Tape & Reel, Tube, or Cut Tape) are secondary parameters that may vary among substitutes while maintaining functional equivalence. Parts with higher clock frequencies (20 MHz) or faster write cycle times (4ms) are forward-compatible. Parts with extended temperature ranges or automotive qualifications represent enhanced specifications suitable for more demanding applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Same Specifications): The 25LC256X-E/ST from Microchip Technology is a direct functional equivalent differing only in packaging format (Tube instead of Tape & Reel). Selection depends on manufacturing process requirements and tape reel availability.

Microchip Technology AT25256B-XHL-B: This part offers enhanced clock frequency (20 MHz) and extended voltage range (1.8V minimum). Operating temperature is reduced to -40°C to 85°C. Suitable for applications requiring higher speed operation and lower voltage operation, with DiGi-Electronics Programmable verification status.

onsemi CAV25256YE-GT3: Maintains identical electrical specifications to the main part (10 MHz, 2.5V ~ 5.5V, -40°C ~ 125°C). Includes automotive grade qualification and AEC-Q100 certification, suitable for automotive applications requiring qualified components.

STMicroelectronics M95256 Series: The M95256-DWDW4TP/K provides the widest operating temperature range (-40°C ~ 145°C) with automotive qualification and AEC-Q100 certification, maintaining 10 MHz clock frequency and 2.5V ~ 5.5V supply compatibility. The M95256-DRDW3TP/K and M95256-DFDW6TP offer 20 MHz operation with reduced temperature ranges. The M95256-WDW6TP provides 20 MHz operation with standard industrial temperature range.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical 8-TSSOP package footprint. Selection should be based on specific application requirements for clock frequency, temperature range, voltage range, and packaging format availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC256XT-E/ST with a part having 20 MHz clock frequency? A: Yes. Parts with 20 MHz clock frequency (AT25256B-XHL-B, M95256-DFDW6TP, M95256-DRDW3TP/K, M95256-WDW6TP) are functionally compatible as they operate at higher speed than the original 10 MHz specification. The application will operate correctly at the lower required frequency.

Q: What is the difference between Tape & Reel and Tube packaging? A: Tape & Reel and Tube are different packaging formats for surface mount components. Tape & Reel is used for automated pick-and-place assembly equipment, while Tube packaging is used for manual handling or lower-volume assembly. Both contain identical components; the difference is in the delivery format.

Q: Are the STMicroelectronics M95256 parts compatible with the Microchip 25LC256XT-E/ST? A: Yes, all M95256 variants listed are compatible. They maintain the same 256Kbit capacity, 32K x 8 organization, SPI interface, and 8-TSSOP package. Differences in clock frequency, temperature range, and write cycle time represent enhanced or alternative specifications suitable for different application requirements.

Q: Can I use a part with a lower minimum voltage (1.7V or 1.8V) in place of the 2.5V minimum specification? A: Yes. Parts with lower minimum voltage specifications (M95256-DFDW6TP at 1.7V, M95256-DRDW3TP/K at 1.8V) are compatible with applications designed for 2.5V ~ 5.5V operation, as they support the full required voltage range.

Q: What does AEC-Q100 qualification mean? A: AEC-Q100 is an automotive industry qualification standard. Parts with this certification (CAV25256YE-GT3, M95256-DRDW3TP/K, M95256-DWDW4TP/K) have been tested and qualified for automotive applications and are suitable for use in automotive systems.

Q: Is the 25LC256X-E/ST a true equivalent to the 25LC256XT-E/ST? A: Yes. The 25LC256X-E/ST is a direct equivalent with identical electrical specifications and 8-TSSOP package. The only difference is the packaging format (Tube vs. Tape & Reel), which affects manufacturing process compatibility but not component functionality.