24C02CT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24C02CT-E/ST is a 2Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This non-volatile memory device operates at 100 kHz I2C clock frequency with 4.6 µs access time and supports supply voltages from 4.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is ROHS3 compliant and currently active in production. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	24C02CT-E/ST
Manufacturer	Microchip Technology
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	100 kHz
Access Time	4.6 µs
Write Cycle Time	1.5 ms
Supply Voltage Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
Product Status	Active
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the 24C02CT-E/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory capacity: 2Kbit (256 x 8 organization)
Interface protocol: I2C
Package type: 8-TSSOP surface mount
Supply voltage range: Must encompass or be compatible with 4.5V ~ 5.5V
Operating temperature range: Must support -40°C ~ 125°C minimum
Non-volatile EEPROM technology

Performance Considerations:

Clock frequency: 100 kHz baseline; higher frequencies (400 kHz, 1 MHz) are backward compatible
Access time: Faster access times are acceptable
Write cycle time: Variations acceptable if within device specifications

Compliance Requirements:

ROHS3 compliance required
Active or equivalent product status preferred

Substitute parts are grouped into three categories based on these parameters: Microchip Technology alternatives with enhanced specifications, Rohm Semiconductor equivalents, onsemi automotive-grade options, and STMicroelectronics variants with extended performance capabilities.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Supply Voltage	Operating Temp	Package	Product Status
24C02CT-E/ST	Microchip Technology	2Kbit	100 kHz	4.6 µs	1.5 ms	4.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR34E02FVT-3E2	Rohm Semiconductor	2Kbit	400 kHz	Not specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAV24C02YE-GT3	onsemi	2Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C02-DRDW3TP/K	STMicroelectronics	2Kbit	1 MHz	450 ns	4 ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C02-WDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Not For New Designs
M34E02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The 34AA02T-E/ST from Microchip Technology provides direct functional substitution with enhanced performance characteristics. It maintains the same 2Kbit capacity, 8-TSSOP package, and -40°C to 125°C operating range as the 24C02CT-E/ST while offering 400 kHz I2C operation and improved access time of 900 ns. The extended supply voltage range of 1.7V to 5.5V provides greater design flexibility. This part is active in production and ROHS3 compliant.

The M24C02-DRDW3TP/K from STMicroelectronics offers the highest performance option with 1 MHz I2C clock frequency and 450 ns access time. It maintains full temperature range support (-40°C to 125°C) and includes AEC-Q100 automotive qualification. Supply voltage range extends to 1.8V minimum, supporting broader application requirements.

Secondary Substitutes (Active Production):

The CAV24C02YE-GT3 from onsemi is an automotive-grade device with AEC-Q100 qualification, 400 kHz I2C operation, and full -40°C to 125°C temperature support. It is suitable for applications requiring automotive-level reliability and traceability.

The M24C02-FDW6TP and M34E02-FDW6TP from STMicroelectronics are active production alternatives with 400 kHz I2C operation and 900 ns access time. Both support 1.7V minimum supply voltage and are ROHS3 compliant.

Alternative Substitutes (Limited Scope):

The Rohm Semiconductor parts BR24G02FVT-3GE2 and BR34E02FVT-3E2 provide functional equivalence with 400 kHz I2C operation but operate only to 85°C maximum temperature, limiting their use in applications requiring the full -40°C to 125°C range.

The M24C02-WDW6TP is marked "Not For New Designs" and should be avoided in new circuit development despite its functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM as a direct replacement for the 100 kHz 24C02CT-E/ST?

A: Yes. Higher I2C clock frequency devices are backward compatible with lower frequency applications. The 34AA02T-E/ST, M24C02-FDW6TP, M34E02-FDW6TP, and CAV24C02YE-GT3 all operate at 400 kHz and function correctly in circuits designed for 100 kHz operation.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both are 8-pin thin shrink small outline packages with 0.173" width and 4.40mm body width. The -B designation indicates a variant from Rohm Semiconductor. Pin compatibility and footprint are equivalent for PCB layout purposes.

Q: Does the supply voltage range affect substitution compatibility?

A: Yes, if your circuit operates at 4.5V to 5.5V, any substitute with a supply range encompassing this window is compatible. The 24C02CT-E/ST requires 4.5V minimum; substitutes with lower minimums (1.6V, 1.7V, 1.8V, 2.5V) are all acceptable. Verify your actual circuit voltage before selection.

Q: Are the Rohm Semiconductor parts suitable for -40°C to 125°C applications?

A: No. BR24G02FVT-3GE2 and BR34E02FVT-3E2 operate only to 85°C maximum. They are not suitable for applications requiring the full -40°C to 125°C temperature range of the original 24C02CT-E/ST.

Q: What does "Not For New Designs" mean for the M24C02-WDW6TP?

A: This designation indicates the part is in legacy status. While functionally compatible and available in inventory, it should not be selected for new circuit designs. Use active production alternatives such as M24C02-FDW6TP or M34E02-FDW6TP instead.

Q: Can I substitute an automotive-grade part (AEC-Q100) in a non-automotive application?

A: Yes. Automotive-grade parts meet higher reliability and qualification standards and are fully compatible in standard industrial and consumer applications. The CAV24C02YE-GT3 and M24C02-DRDW3TP/K are suitable for any application requiring 2Kbit I2C EEPROM functionality.

Q: What is the significance of access time differences (4.6 µs vs. 900 ns vs. 450 ns)?

A: Access time is the delay from address input to data output availability. Faster access times (900 ns, 450 ns) are superior and fully compatible with circuits designed for slower devices (4.6 µs). No circuit modification is required when upgrading to faster access time parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the 24C02CT-E/ST.

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