24LC128-E/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC128-E/SM is a 128Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIJ surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports a supply voltage range of 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The device is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level rating.

Equivalent and substitute parts are necessary when the original 24LC128-E/SM becomes unavailable, when alternative packaging formats are required for manufacturing optimization, or when enhanced performance specifications (higher clock frequency, faster access time, or extended temperature ranges) are needed for specific application requirements.

Key Parameters

Parameter	Value
Memory Size	128Kbit
Memory Organization	16K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-SOIJ
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC128-E/SM is determined by the following mandatory parameters:

Memory capacity of 128Kbit with 16K x 8 organization
I2C serial interface protocol
Non-volatile EEPROM technology
Surface mount packaging in 8-pin configuration (SOIJ, SOIC, or SOP variants)
Supply voltage compatibility within or exceeding 2.5V to 5.5V range
Write cycle time of 5ms or faster
Operating temperature range supporting at least -40°C to 125°C

Substitute parts are grouped into two categories: direct functional equivalents with identical or superior electrical performance, and compatible alternatives with acceptable parameter variations. Clock frequency may be equal to or greater than 400 kHz. Access time may be equal to or faster than 900 ns. Supply voltage range may be equal to or broader than the original specification. Operating temperature range must support the full -40°C to 125°C span or be explicitly verified for application compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC128-E/SM	Microchip Technology	128Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIJ	Active
CAV24C128WE-GT3	onsemi	128Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
BR24G128F-3AGTE2	Rohm Semiconductor	128Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
BR24S128F-WE2	Rohm Semiconductor	128Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
M24128-BRMN6TP	STMicroelectronics	128Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
M24128-BWMN6TP	STMicroelectronics	128Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Not For New Designs
M24128-DRMN3TP/K	STMicroelectronics	128Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
M24128-DRMN8TP/K	STMicroelectronics	128Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active

Engineering Selection Recommendations

For direct replacement in existing designs without modification, CAV24C128WE-GT3 from onsemi provides full parameter compatibility with enhanced performance characteristics including 1 MHz clock frequency and 400 ns access time, while maintaining the identical 2.5V to 5.5V supply range and -40°C to 125°C operating temperature specification.

M24128-DRMN3TP/K from STMicroelectronics is recommended for new designs requiring automotive-grade qualification (AEC-Q100) with extended temperature support to 125°C. This part maintains active product status and offers 1.8V to 5.5V supply voltage range with 1 MHz I2C operation.

BR24S128F-WE2 from Rohm Semiconductor is suitable for applications where 400 kHz I2C operation is specified and DiGi-Electronics programmable verification is required. This part is active and ROHS3 compliant, though operating temperature is limited to -40°C to 85°C.

M24128-BWMN6TP from STMicroelectronics is not recommended for new designs due to its "Not For New Designs" product status, despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CAV24C128WE-GT3 directly replace 24LC128-E/SM without PCB modifications?

A: CAV24C128WE-GT3 is functionally compatible and can operate in the same I2C circuit. However, package geometry differs (8-SOIC versus 8-SOIJ), requiring PCB footprint adjustment. Electrical parameters are fully compatible with identical supply voltage range and extended temperature support.

Q: What is the difference between 400 kHz and 1 MHz clock frequency operation?

A: Clock frequency determines I2C bus speed. The 24LC128-E/SM operates at 400 kHz standard I2C speed. Substitute parts rated for 1 MHz (fast I2C mode) are backward compatible and operate correctly at 400 kHz when the host controller uses standard speed. Higher frequency capability does not affect compatibility.

Q: Why do some substitutes have narrower operating temperature ranges?

A: BR24G128F-3AGTE2, BR24S128F-WE2, M24128-BRMN6TP, and M24128-BWMN6TP are specified for -40°C to 85°C operation, which is narrower than the original 24LC128-E/SM specification of -40°C to 125°C. These parts are suitable only for applications not requiring operation above 85°C. For full temperature range compatibility, select CAV24C128WE-GT3 or M24128-DRMN3TP/K.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive electronics qualification standard. M24128-DRMN3TP/K and M24128-DRMN8TP/K carry this certification, indicating suitability for automotive applications with enhanced reliability and quality assurance requirements.

Q: Is the 24LC128-E/SM still available for new designs?

A: Yes, 24LC128-E/SM maintains active product status with 2100 pieces in stock. However, CAV24C128WE-GT3 and M24128-DRMN3TP/K are recommended for new designs due to superior performance specifications and broader availability.

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