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

Part Overview

The 25LC128T-E/SM is a 128Kbit SPI EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIJ surface mount configuration. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and supports industrial temperature range from -40°C to 125°C. The part is currently active in production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary when the original 25LC128T-E/SM becomes unavailable, when alternative packaging formats are required for manufacturing optimization, or when enhanced performance specifications (such as higher clock frequency or extended voltage range) are beneficial for system design.

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
Mounting Type	Surface Mount
Package Type	8-SOIJ (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 25LC128T-E/SM is determined by the following critical parameters:

Core Functional Requirements:

Memory Size: 128Kbit (mandatory match)
Memory Organization: 16K x 8 (mandatory match)
Memory Interface: SPI (mandatory match)
Write Cycle Time: 5ms (mandatory match)

Electrical Compatibility Criteria:

Voltage Supply Range: Must encompass or be compatible with 2.5V ~ 5.5V
Clock Frequency: 10 MHz minimum (higher frequencies are acceptable for backward compatibility)
Operating Temperature: Must support -40°C ~ 125°C range or be suitable for the intended application temperature window

Physical & Manufacturing Criteria:

Mounting Type: Surface Mount (mandatory)
Package Type: 8-pin SOIC/SOIJ variants acceptable with pin-compatible layouts
MSL Rating: 1 (Unlimited) preferred for standard applications; MSL 3 acceptable with proper handling

Compliance & Quality:

RoHS Status: ROHS3 Compliant (mandatory)
Product Status: Active preferred; Obsolete parts listed for reference only
Programmable Verification: Verified status indicates tested compatibility

Substitute parts are grouped into two categories: Direct Functional Equivalents (identical electrical specifications and pin compatibility) and Enhanced Specification Alternatives (higher clock frequency, extended voltage range, or improved temperature performance while maintaining core functionality).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package Type	Product Status	MSL Rating
25LC128T-E/SM	Microchip Technology	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIJ (5.30mm)	Active	1 (Unlimited)
AT25128B-SSHL-B	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	1 (Unlimited)
AT25128B-SSHL-T	Microchip Technology	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	3 (168 Hours)
BR25S128F-WE2	Rohm Semiconductor	128Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP (4.40mm)	Active	1 (Unlimited)
CAT25128VI-G	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Obsolete	1 (Unlimited)
CAT25128VI-GT3	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	1 (Unlimited)
CAT25128VP2I-GT3	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active	1 (Unlimited)
CAT25128XI-T2	onsemi	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (5.30mm)	Active	3 (168 Hours)
CAV25128VE-GT3	onsemi	128Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC (3.90mm)	Active	1 (Unlimited)
M95128-DFMN6TP	STMicroelectronics	128Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	1 (Unlimited)
M95128-RMN6TP	STMicroelectronics	128Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	1 (Unlimited)

Engineering Selection Recommendations

Primary Equivalent (Identical Specifications): CAV25128VE-GT3 (onsemi) provides the closest functional match to 25LC128T-E/SM with identical clock frequency (10 MHz), voltage supply range (2.5V ~ 5.5V), and operating temperature range (-40°C ~ 125°C). This part maintains full backward compatibility and is qualified to AEC-Q100 automotive standards. Product status is Active with unlimited MSL rating.

Secondary Equivalents (Enhanced Performance): AT25128B-SSHL-T, CAT25128VI-GT3, and M95128-RMN6TP offer higher clock frequency (20 MHz) while maintaining 128Kbit capacity and SPI interface. These parts are suitable for applications where increased data throughput is beneficial. All three are Active status with ROHS3 compliance. Note that operating temperature range is reduced to -40°C ~ 85°C compared to the original part.

Alternative Packaging Options: CAT25128VP2I-GT3 provides 8-TDFN (2x3) package format for space-constrained applications while maintaining electrical specifications of 20 MHz operation and 1.8V ~ 5.5V supply range. CAT25128XI-T2 offers 8-SOIC package with 5.30mm width matching the original 25LC128T-E/SM footprint but with 20 MHz clock frequency.

Obsolete Part Status: CAT25128VI-G is listed as Obsolete and should not be selected for new designs despite technical compatibility.

Compliance Verification: All recommended substitute parts maintain ROHS3 compliance and EAR99 export classification matching the original part. MSL ratings of 1 (Unlimited) are preferred for standard manufacturing environments; MSL 3 rated parts (AT25128B-SSHL-T, CAT25128XI-T2) require controlled moisture handling during assembly.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 20 MHz clock frequency in place of the 10 MHz 25LC128T-E/SM? A: Yes. Higher clock frequency parts operate at backward compatibility with lower frequency system designs. The 20 MHz parts (AT25128B-SSHL-T, CAT25128VI-GT3, M95128-RMN6TP, M95128-DFMN6TP) will function correctly in 10 MHz SPI bus environments.

Q: What is the impact of reduced operating temperature range on substitute parts? A: Most substitute parts support -40°C ~ 85°C versus the original -40°C ~ 125°C. If your application requires operation above 85°C, only CAV25128VE-GT3 maintains the full -40°C ~ 125°C range. Verify your system's maximum operating temperature requirement before selection.

Q: Are the different package types (SOIC, SOIJ, TDFN, SOP) pin-compatible? A: 8-pin SOIC and SOIJ packages share identical pin configurations and are mechanically interchangeable on standard PCB layouts. TDFN (2x3) and SOP packages have different footprints and require PCB redesign. Verify package dimensions: SOIJ/SOIC at 3.90mm or 5.30mm width, TDFN at 2x3mm, SOP at 4.40mm width.

Q: What does MSL rating mean for component selection? A: MSL (Moisture Sensitivity Level) 1 (Unlimited) parts have no moisture absorption restrictions and can be stored indefinitely. MSL 3 (168 Hours) parts must be used within 168 hours of package opening or require baking before reflow soldering. For standard manufacturing, MSL 1 parts are preferred.

Q: Is CAV25128VE-GT3 suitable for automotive applications? A: Yes. CAV25128VE-GT3 carries AEC-Q100 automotive qualification and is graded for automotive use. Other substitute parts do not list automotive qualification.

Q: Can I substitute the 25LC128T-E/SM with a part having lower voltage supply range? A: No. The original part supports 2.5V ~ 5.5V. Substitute parts with 1.7V ~ 1.8V minimum voltage are acceptable only if your system operates within their specified range. Verify your power supply voltage before selection.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel packaging? A: Both are surface mount packaging formats suitable for automated assembly. Tape & Reel is standard for high-volume production. Cut Tape & Digi-Reel offers flexibility for lower volumes or mixed component orders. Electrical specifications are identical; packaging choice depends on procurement and assembly requirements.

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