24LC128T-E/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC128T-E/SM is a 128Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-SOIJ packaging via Tape & Reel. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is currently Active in product status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, electrical specifications, and package compatibility to ensure functional interchangeability in circuit designs.

Key Parameters

Parameter	24LC128T-E/SM
Manufacturer	Microchip Technology
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
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC128T-E/SM are qualified based on the following core parameters:

Memory Capacity: 128Kbit (16K x 8 organization) — all substitutes must match this capacity
Interface Protocol: I2C serial interface — all substitutes must support I2C communication
Supply Voltage Range: Minimum 2.5V support required for direct substitution; parts with lower minimum voltage (1.7V or 1.8V) are compatible but offer extended operating range
Operating Temperature: Minimum -40°C to 85°C required; the main part extends to 125°C, so substitutes with 125°C upper limit provide full compatibility
Package Compatibility: 8-pin SOIC/SOIJ packages are mechanically and electrically compatible; minor width variations (3.90mm to 5.30mm) do not affect PCB layout for standard footprints
Write Cycle Time: 4ms to 5ms range acceptable
Access Time: 400ns to 900ns range acceptable; faster access times provide performance margin

Substitutes are grouped into two categories: direct equivalents (matching all primary parameters) and compatible alternatives (meeting minimum functional requirements with potential performance or temperature advantages).

Parameter Comparison

Parameter	24LC128T-E/SM	CAV24C128WE-GT3	BR24G128F-3AGTE2	BR24S128F-WE2	M24128-BRMN6TP	M24128-BWMN6TP	M24128-DRMN3TP/K	M24128-DRMN8TP/K
Manufacturer	Microchip	onsemi	Rohm	Rohm	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	128Kbit	128Kbit	128Kbit	128Kbit	128Kbit	128Kbit	128Kbit	128Kbit
Memory Organization	16K x 8	16K x 8	16K x 8	16K x 8	16K x 8	16K x 8	16K x 8	16K x 8
I2C Clock Frequency	400 kHz	1 MHz	1 MHz	400 kHz	1 MHz	1 MHz	1 MHz	1 MHz
Access Time	900 ns	400 ns	—	—	450 ns	450 ns	450 ns	450 ns
Write Cycle Time	5ms	5ms	5ms	5ms	5ms	5ms	4ms	4ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C
Package Type	8-SOIJ	8-SOIC	8-SOP	8-SOP	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Active	Active	Active	Active	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
AEC-Q100 Qualified	—	Yes	—	—	—	—	Yes	Yes

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

CAV24C128WE-GT3 (onsemi) and BR24S128F-WE2 (Rohm) provide direct functional equivalence to the 24LC128T-E/SM. Both maintain the 2.5V to 5.5V supply voltage range and -40°C to 125°C operating temperature window. CAV24C128WE-GT3 offers enhanced I2C clock frequency (1 MHz vs. 400 kHz) with faster access time (400 ns), providing performance margin. BR24S128F-WE2 matches the 400 kHz clock frequency of the main part, ensuring identical timing behavior. Both are Active products with ROHS3 compliance.

Secondary Substitutes (Extended Operating Range)

M24128-DRMN3TP/K (STMicroelectronics) is qualified for automotive applications (AEC-Q100) and extends the operating temperature to -40°C to 125°C, matching the main part. This part operates at 1 MHz I2C frequency with 450 ns access time and 1.8V minimum supply voltage. M24128-DRMN8TP/K provides similar specifications with -40°C to 105°C temperature range and is also AEC-Q100 qualified.

Conditional Substitutes (Limited Temperature Range)

BR24G128F-3AGTE2 (Rohm) and M24128-BRMN6TP (STMicroelectronics) operate at reduced temperature range (-40°C to 85°C) compared to the main part. These are suitable for applications not requiring the full 125°C upper limit. M24128-BWMN6TP is marked "Not For New Designs" and should be avoided for new circuit implementations.

Packaging Consideration

The main part uses 8-SOIJ packaging. All substitute parts use 8-SOIC or 8-SOP variants. These packages are mechanically and electrically compatible with standard 8-pin SOIC footprints on PCBs, though physical dimensions vary slightly (3.90mm to 5.30mm width). Verify PCB footprint compatibility before final selection.

Frequently Asked Questions (FAQ)

Q: Can I substitute CAV24C128WE-GT3 for 24LC128T-E/SM in a 400 kHz I2C system?

A: Yes. CAV24C128WE-GT3 operates at 1 MHz I2C frequency, which is backward compatible with 400 kHz bus speeds. The device will function correctly at the lower clock rate. No firmware or circuit modifications are required.

Q: What is the difference between M24128-DRMN3TP/K and M24128-BRMN6TP?

A: M24128-DRMN3TP/K supports -40°C to 125°C operating temperature and is AEC-Q100 automotive qualified. M24128-BRMN6TP operates at -40°C to 85°C and is not automotive qualified. Select M24128-DRMN3TP/K for applications requiring the full temperature range or automotive compliance.

Q: Are 8-SOIC and 8-SOIJ packages interchangeable on the same PCB footprint?

A: 8-SOIC and 8-SOIJ packages are mechanically compatible with standard 8-pin SOIC PCB footprints. Minor width variations (3.90mm to 5.30mm) do not affect placement or soldering. Verify your PCB design accommodates the specific package width before assembly.

Q: Which substitute offers the fastest I2C performance?

A: CAV24C128WE-GT3 operates at 1 MHz I2C frequency with 400 ns access time, providing the fastest performance among substitutes. All other 1 MHz options (BR24G128F-3AGTE2, M24128 series) have 450 ns access time.

Q: Can I use M24128-BWMN6TP in a new design?

A: No. M24128-BWMN6TP is marked "Not For New Designs" by STMicroelectronics. Use M24128-DRMN3TP/K or M24128-DRMN8TP/K for new circuit implementations.

Q: What is the minimum supply voltage for each substitute?

A: 24LC128T-E/SM, CAV24C128WE-GT3, and M24128-BWMN6TP require 2.5V minimum. BR24G128F-3AGTE2, BR24S128F-WE2, M24128-DRMN3TP/K, and M24128-DRMN8TP/K support 1.7V to 1.8V minimum, offering extended low-voltage operation.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes are ROHS3 compliant. The main part 24LC128T-E/SM is also ROHS3 compliant.

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