24LC1026-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC1026-E/ST is a 1Mbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The device provides non-volatile memory storage with I2C interface capability, 400 kHz clock frequency, and operates across industrial temperature ranges from -40°C to 125°C.

Key Parameters

Parameter	24LC1026-E/ST
Memory Size	1Mbit
Memory Organization	128K 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-TSSOP
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 24LC1026-E/ST is determined by the following critical parameters:

Core Functional Requirements:

Memory Size: 1Mbit (128K x 8 organization)
Memory Interface: I2C protocol
Memory Type: Non-Volatile EEPROM
Write Cycle Time: 5ms maximum

Electrical Compatibility:

Voltage Supply Range: Minimum 2.5V support required
Operating Temperature: Minimum -40°C to 125°C range required
Clock Frequency: 400 kHz minimum support

Physical Compatibility:

Package Type: 8-TSSOP or 8-SOIC surface mount packages
Pin Configuration: Compatible I2C pinout

Substitute parts are grouped into two categories based on package type compatibility:

Group 1 - 8-TSSOP Package (Direct Package Match): CAT24M01YI-GT3, CAT24M01YI-GT3JN, CAV24M01YE-GT3, M24M01-DFDW6TP, M24M01-DWDW3TP/K, M24M01-RDW6TP

Group 2 - 8-SOIC Package (Alternative Package): 24LC1026-E/SN

Parameter Comparison

Parameter	24LC1026-E/ST	24LC1026-E/SN	CAT24M01YI-GT3	CAT24M01YI-GT3JN	CAV24M01YE-GT3	M24M01-DFDW6TP	M24M01-DWDW3TP/K	M24M01-RDW6TP
Manufacturer	Microchip	Microchip	onsemi	onsemi	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8
Memory Interface	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	1 MHz	1 MHz	1 MHz	1 MHz	1 MHz	1 MHz
Access Time	900 ns	900 ns	400 ns	400 ns	400 ns	500 ns	450 ns	500 ns
Write Cycle Time	5ms	5ms	5ms	5ms	5ms	5ms	4ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 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 ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-SOIC	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Automotive Grade	No	No	No	No	Yes (AEC-Q100)	No	Yes (AEC-Q100)	No
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Package Replacement (8-TSSOP):

The 24LC1026-E/SN from Microchip Technology is the primary substitute, maintaining identical electrical specifications and the same manufacturer lineage. This part is active in production with high inventory availability (33,200 units), though it uses 8-SOIC packaging requiring PCB layout modification.

For applications requiring the original 8-TSSOP package footprint, the M24M01-DFDW6TP and M24M01-RDW6TP from STMicroelectronics provide direct pin-compatible replacements with enhanced performance (1 MHz clock frequency, faster access times). Both parts maintain the required voltage range (1.7V ~ 5.5V and 1.8V ~ 5.5V respectively) and support the full industrial temperature range when paired with appropriate system design.

For Automotive Applications:

The CAV24M01YE-GT3 (onsemi) and M24M01-DWDW3TP/K (STMicroelectronics) are qualified to AEC-Q100 automotive standards. The M24M01-DWDW3TP/K offers superior performance with 450 ns access time and 4ms write cycle time while maintaining -40°C to 125°C operating range and 2.5V ~ 5.5V supply compatibility.

For General Industrial Use:

The CAT24M01YI-GT3 and CAT24M01YI-GT3JN from onsemi provide cost-effective alternatives with enhanced clock frequency (1 MHz) and faster access times (400 ns). Note that these parts operate to -40°C to 85°C, which is acceptable for most industrial applications but does not extend to the full 125°C upper limit of the original part.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. MSL ratings are predominantly Level 1 (unlimited moisture sensitivity), with the exception of 24LC1026-E/SN (MSL 3, 168 hours), which requires controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I use the 24LC1026-E/SN as a direct replacement for the 24LC1026-E/ST?

A: The 24LC1026-E/SN is electrically identical to the 24LC1026-E/ST and maintains the same manufacturer (Microchip Technology). However, it uses 8-SOIC packaging instead of 8-TSSOP, requiring PCB layout modification. The part is active in production with substantial inventory availability.

Q: What is the primary difference between the onsemi CAT24M01 and STMicroelectronics M24M01 series?

A: Both series provide 1Mbit I2C EEPROM functionality in 8-TSSOP packaging. The M24M01 series from STMicroelectronics offers faster access times (450-500 ns vs. 400 ns) and operates to lower minimum voltages (1.7V-1.8V vs. 1.8V-2.5V). The CAT24M01 series from onsemi provides 400 ns access time. Operating temperature ranges differ: M24M01-DWDW3TP/K extends to 125°C, while most CAT24M01 variants are limited to 85°C.

Q: Are the substitute parts pin-compatible with the original 24LC1026-E/ST?

A: All 8-TSSOP packaged substitutes (CAT24M01YI-GT3, CAT24M01YI-GT3JN, CAV24M01YE-GT3, M24M01-DFDW6TP, M24M01-DWDW3TP/K, M24M01-RDW6TP) maintain identical pinout and I2C protocol compatibility. The 24LC1026-E/SN uses 8-SOIC packaging with different pin spacing and requires PCB redesign.

Q: Which substitute part should I select for automotive applications?

A: The M24M01-DWDW3TP/K (STMicroelectronics) and CAV24M01YE-GT3 (onsemi) are both qualified to AEC-Q100 automotive standards. The M24M01-DWDW3TP/K provides superior performance specifications (450 ns access time, 4ms write cycle) and extends to the full -40°C to 125°C temperature range while maintaining 2.5V ~ 5.5V supply compatibility.

Q: What is the impact of the higher clock frequency (1 MHz) in substitute parts compared to the original 400 kHz?

A: The higher clock frequency in substitute parts (CAT24M01, M24M01 series) provides enhanced data transfer rates and faster access times. This is backward compatible with systems designed for 400 kHz operation, as I2C protocol supports clock stretching and the substitute parts maintain full I2C compliance. No firmware or software modifications are required.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. The 24LC1026-E/SN has the highest inventory (33,200 units), followed by M24M01-DFDW6TP (48,200 units) and CAT24M01YI-GT3 (18,287 units). The M24M01-DWDW3TP/K has limited availability (1,111 units), and CAV24M01YE-GT3 has 1,113 units. For high-volume production, M24M01-DFDW6TP or 24LC1026-E/SN are recommended.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter?

A: Most substitute parts have MSL 1 (unlimited moisture sensitivity), matching the original part. The 24LC1026-E/SN has MSL 3 (168 hours), requiring controlled storage and handling within 168 hours of package opening. For applications with extended lead times or inventory storage, MSL 1 rated parts are preferred.

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