Equivalent & Substitute Parts for 25LC256XT-I/ST

Part Overview

The 25LC256XT-I/ST is a 256Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface with 10 MHz clock frequency in 8-TSSOP surface mount packaging. This non-volatile memory device operates across a 2.5V to 5.5V supply range and supports industrial temperature specifications from -40°C to 85°C. The part is ROHS3 compliant and currently in active production status with 787 units in stock.

Equivalent and substitute parts are identified based on matching core electrical and mechanical parameters: 256Kbit memory capacity, 32K x 8 organization, SPI interface, 8-TSSOP package, and compatible voltage/temperature operating ranges. Substitutes may vary in clock frequency, write cycle time, supply voltage range, and temperature grade while maintaining functional compatibility.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Write Cycle Time	5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the 25LC256XT-I/ST is determined by the following mandatory parameters:

Core Compatibility Requirements:

Memory capacity: 256Kbit
Memory organization: 32K x 8
Interface protocol: SPI
Package: 8-TSSOP surface mount
Voltage supply overlap with 2.5V ~ 5.5V range
Temperature range compatibility with -40°C minimum and 85°C maximum

Variable Parameters Allowing Substitution:

Clock frequency: 10 MHz or higher (20 MHz acceptable)
Write cycle time: 5ms or faster (4ms acceptable)
Supply voltage range: May extend beyond 2.5V ~ 5.5V (1.7V, 1.8V minimum acceptable)
Operating temperature: May extend beyond 85°C upper limit (105°C, 125°C, 145°C acceptable for automotive grades)
Packaging format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or Tube acceptable
Automotive qualification: AEC-Q100 certified parts acceptable for industrial applications

Substitute parts are grouped by manufacturer and base product number while maintaining electrical and mechanical compatibility within the 8-TSSOP package footprint.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Write Cycle Time	Package	Inventory
25LC256XT-I/ST	Microchip Technology	256Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	787 Pcs
25LC256T-I/ST	Microchip Technology	256Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	6124 Pcs
AT25256B-XHL-B	Microchip Technology	256Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	2159 Pcs
CAT25256YI-GT3	onsemi	256Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	1884 Pcs
CAV25256YE-GT3	onsemi	256Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	3301 Pcs
M95256-DFDW6TP	STMicroelectronics	256Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	2863 Pcs
M95256-DRDW3TP/K	STMicroelectronics	256Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	2100 Pcs
M95256-DRDW8TP/K	STMicroelectronics	256Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 105°C	4ms	8-TSSOP	17725 Pcs
M95256-DWDW4TP/K	STMicroelectronics	256Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	4180 Pcs
M95256-RDW6TP	STMicroelectronics	256Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	20598 Pcs
M95256-WDW6TP	STMicroelectronics	256Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	31000 Pcs

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): The 25LC256T-I/ST from Microchip Technology is a direct equivalent with matching electrical and mechanical specifications. This part differs only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and carries higher inventory availability at 6124 units.

Microchip Technology Alternatives: The AT25256B-XHL-B operates at 20 MHz clock frequency with extended supply voltage range (1.8V minimum) while maintaining identical temperature and write cycle specifications. This part provides performance headroom for timing-critical applications.

onsemi Alternatives: CAT25256YI-GT3 matches the AT25256B-XHL-B electrical specifications with 20 MHz operation and 1.8V minimum supply voltage. CAV25256YE-GT3 maintains 10 MHz operation with 2.5V ~ 5.5V supply range but extends temperature rating to 125°C and includes AEC-Q100 automotive qualification.

STMicroelectronics Alternatives: M95256 series parts provide multiple configurations. M95256-WDW6TP and M95256-RDW6TP offer 20 MHz operation with 2.5V ~ 5.5V and 1.8V ~ 5.5V supply ranges respectively, both with 5ms write cycle time. M95256-DRDW3TP/K and M95256-DRDW8TP/K feature faster 4ms write cycle time with 20 MHz operation and AEC-Q100 qualification. M95256-DWDW4TP/K maintains 10 MHz operation with extended temperature range to 145°C and AEC-Q100 qualification.

All substitute parts maintain ROHS3 compliance and are in active production status. Selection should prioritize inventory availability and specific application requirements for clock frequency, supply voltage range, and temperature operating limits.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC256XT-I/ST with a 20 MHz variant? A: Yes. Parts operating at 20 MHz clock frequency are functionally compatible as they exceed the 10 MHz requirement. The 25LC256XT-I/ST specifies 10 MHz operation; higher frequency parts maintain backward compatibility in SPI interface timing.

Q: What is the difference between Tape & Reel and Cut Tape packaging? A: Both packaging formats contain identical die and electrical specifications. Tape & Reel (TR) provides continuous reel format for automated assembly lines. Cut Tape (CT) & Digi-Reel® provides pre-cut tape segments. Selection depends on assembly equipment and volume requirements.

Q: Are automotive-grade parts (AEC-Q100) suitable for industrial applications? A: Yes. Automotive-qualified parts meet or exceed industrial specifications. Parts such as M95256-DRDW3TP/K, M95256-DRDW8TP/K, M95256-DWDW4TP/K, and CAV25256YE-GT3 carry AEC-Q100 qualification and are compatible with industrial designs.

Q: Which substitute offers the fastest write cycle time? A: M95256-DRDW3TP/K and M95256-DRDW8TP/K both specify 4ms write cycle time, compared to 5ms for the 25LC256XT-I/ST. This represents a 20% improvement in write performance.

Q: What is the minimum supply voltage for each substitute? A: The 25LC256XT-I/ST requires 2.5V minimum. Alternatives with lower minimums include AT25256B-XHL-B, CAT25256YI-GT3, M95256-DFDW6TP, M95256-DRDW3TP/K, M95256-DRDW8TP/K, and M95256-RDW6TP, all supporting 1.7V or 1.8V minimum operation.

Q: Can I use a part with extended temperature range in place of the original? A: Yes. Parts rated for higher maximum temperatures (105°C, 125°C, 145°C) are compatible with applications requiring -40°C to 85°C operation. Extended temperature capability does not affect performance within the original specification range.

Q: Which substitute has the highest inventory availability? A: M95256-WDW6TP from STMicroelectronics carries 31000 units in stock, providing maximum availability for high-volume production requirements.

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