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

Part Overview

The 24LC1026-I/ST is a 1Mbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This part is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 1Mbit I2C EEPROM functionality with compatible electrical and mechanical specifications.

Key Parameters

Parameter	24LC1026-I/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 ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 24LC1026-I/ST are selected based on the following critical parameters that determine functional compatibility:

Core Compatibility Parameters:

Memory Size: 1Mbit (128K x 8 organization)
Memory Interface: I2C protocol
Package / Case: 8-TSSOP surface mount form factor
Voltage Supply Range: Must encompass or be compatible with 2.5V ~ 5.5V
Operating Temperature Range: Must support -40°C ~ 85°C minimum
RoHS Compliance: ROHS3 Compliant

Performance Parameters (Secondary):

Clock Frequency: 400 kHz minimum (higher frequencies are backward compatible)
Access Time: 900 ns maximum (faster access times are acceptable)
Write Cycle Time: 5ms maximum

Substitute parts are grouped into two categories: direct replacements maintaining identical electrical specifications, and enhanced alternatives offering improved performance characteristics while maintaining full functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
24LC1026-I/ST	Microchip Technology	1Mbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24LC1026-I/SN	Microchip Technology	1Mbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
AT24CM01-XHD-B	Microchip Technology	1Mbit	1 MHz	550 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CM01-XHM-B	Microchip Technology	1Mbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24M01YI-GT3	onsemi	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24M01YI-GT3JN	onsemi	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAV24M01YE-GT3	onsemi	1Mbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24M01-DFDW6TP	STMicroelectronics	1Mbit	1 MHz	500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24M01-DWDW3TP/K	STMicroelectronics	1Mbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24M01-RDW6TP	STMicroelectronics	1Mbit	1 MHz	500 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: AT24CM01-XHD-B or AT24CM01-XHM-B (Microchip Technology) are the preferred substitutes. Both maintain the same manufacturer ecosystem, identical memory capacity and organization, I2C interface compatibility, and 8-TSSOP packaging. Both parts are active product status with full availability. AT24CM01-XHD-B maintains the exact voltage supply range (2.5V ~ 5.5V) of the original part. AT24CM01-XHM-B extends the lower voltage limit to 1.7V, providing additional design flexibility.

Alternative Substitutes with Enhanced Performance: CAT24M01YI-GT3, CAT24M01YI-GT3JN (onsemi), M24M01-DFDW6TP, M24M01-RDW6TP (STMicroelectronics), and M24M01-DWDW3TP/K (STMicroelectronics) offer improved clock frequency (1 MHz vs. 400 kHz) and faster access times. These parts maintain full I2C protocol compatibility and 8-TSSOP packaging. All are active product status with established supply chains.

Automotive-Grade Option: CAV24M01YE-GT3 (onsemi) and M24M01-DWDW3TP/K (STMicroelectronics) are AEC-Q100 qualified automotive-grade components with extended operating temperature range (-40°C ~ 125°C). These are suitable for applications requiring automotive qualification or enhanced temperature performance.

Package Consideration: 24LC1026-I/SN (Microchip Technology) provides identical electrical specifications to the original part but uses 8-SOIC packaging instead of 8-TSSOP. This substitute is appropriate only if PCB layout accommodates the larger SOIC form factor.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 1 MHz clock frequency in place of the 400 kHz 24LC1026-I/ST? A: Yes. Higher clock frequency parts are backward compatible. The I2C bus will operate at the lower frequency determined by the system master controller. The substitute part will function correctly in 400 kHz systems.

Q: What is the difference between AT24CM01-XHD-B and AT24CM01-XHM-B? A: Both parts are functionally identical with identical performance specifications. The primary difference is voltage supply range: AT24CM01-XHD-B operates 2.5V ~ 5.5V (matching the original part), while AT24CM01-XHM-B operates 1.7V ~ 5.5V (extended lower voltage capability). Select based on your system's minimum supply voltage requirement.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original part's environmental compliance status.

Q: Can I use CAV24M01YE-GT3 or M24M01-DWDW3TP/K in non-automotive applications? A: Yes. Automotive-qualified parts exceed standard industrial specifications and are fully compatible with non-automotive applications. These parts offer extended temperature range (-40°C ~ 125°C) and AEC-Q100 qualification, providing additional design margin and reliability assurance.

Q: What is the impact of different access times (900 ns vs. 550 ns vs. 400 ns)? A: Access time defines the maximum delay from I2C address/command transmission to data availability. Faster access times (lower nanosecond values) provide improved system performance. All substitute parts with faster access times are fully compatible and will not cause timing issues in systems designed for the original 900 ns specification.

Q: Does packaging affect electrical compatibility? A: No. Packaging (8-TSSOP vs. 8-SOIC) affects only PCB layout and assembly considerations. Electrical specifications and I2C protocol compatibility remain identical. Select packaging based on your PCB design requirements and available board space.

Q: Are there supply chain advantages to selecting one substitute over another? A: Yes. Inventory levels vary by part number. Consult current stock availability: CAT24M01YI-GT3 (18,287 pcs), M24M01-DFDW6TP (48,200 pcs), and M24M01-RDW6TP (8,200 pcs) show strong availability. AT24CM01-XHD-B (1,000,300 pcs) offers exceptional stock depth for high-volume requirements.

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