Microchip 24C00T/ST EEPROM 128-Bit I2C Memory - Equivalent & Substitute Parts

Part Overview

The Microchip 24C00T/ST is a 128-bit EEPROM memory IC with I2C interface operating at 400 kHz. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The 24C00T/ST provides non-volatile storage in an 8-TSSOP surface mount package with 16 x 8 memory organization and 4ms write cycle time.

Key Parameters

Parameter	Value
Manufacturer Part Number	24C00T/ST
Manufacturer	Microchip Technology
Memory Size	128 bit
Memory Format	EEPROM
Memory Interface	I2C
Clock Frequency	400 kHz
Memory Organization	16 x 8
Write Cycle Time	4 ms
Access Time	4.6 µs
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24C00T/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 128 bit (fixed)
Memory Format: EEPROM (fixed)
Memory Interface: I2C (fixed)
Memory Organization: 16 x 8 (fixed)
Package Type: 8-TSSOP (fixed)
Write Cycle Time: 4 ms (fixed)

Allowable Variation Parameters:

Clock Frequency: 400 kHz or lower (100 kHz acceptable)
Access Time: 4.6 µs or faster
Voltage Supply Range: Must encompass or exceed 4.5V ~ 5.5V minimum requirement
Operating Temperature: May extend beyond 0°C ~ 70°C range
Product Status: Active preferred over obsolete

Substitute parts are grouped based on voltage supply compatibility and operating temperature range, as these parameters determine system-level integration feasibility.

Parameter Comparison

Parameter	24C00T/ST (Main)	24AA00T-I/ST	24C00T-E/ST	24C00T-I/ST	24LC00T-I/ST	24LC00T/ST
Memory Size	128 bit	128 bit	128 bit	128 bit	128 bit	128 bit
Memory Format	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM
Memory Interface	I2C	I2C	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	100 kHz	400 kHz	400 kHz	400 kHz
Memory Organization	16 x 8	16 x 8	16 x 8	16 x 8	16 x 8	16 x 8
Write Cycle Time	4 ms	4 ms	4 ms	4 ms	4 ms	4 ms
Access Time	4.6 µs	3500 ns	4.6 µs	4.6 µs	4.6 µs	4.6 µs
Voltage Supply Range	4.5V ~ 5.5V	1.8V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Thermal Specifications):

24C00T-I/ST and 24LC00T/ST are direct substitutes for the 24C00T/ST. Both maintain the same voltage supply range (4.5V ~ 5.5V minimum), identical clock frequency (400 kHz), and compatible operating temperature ranges. All three parts are ROHS3 compliant. The 24C00T-I/ST and 24LC00T/ST are active products, eliminating obsolescence concerns.

Extended Temperature Range Substitutes:

24AA00T-I/ST, 24C00T-E/ST, and 24LC00T-I/ST offer extended operating temperature ranges (-40°C to 85°C or -40°C to 125°C) compared to the original 0°C to 70°C specification. These parts are suitable for applications requiring broader thermal performance. All maintain ROHS3 compliance and active product status.

Reduced Clock Frequency Substitute:

24C00T-E/ST operates at 100 kHz instead of 400 kHz. This part is appropriate only for systems where reduced I2C bus speed is acceptable. It provides the widest operating temperature range (-40°C to 125°C) among all substitutes.

Lower Voltage Supply Substitutes:

24AA00T-I/ST supports 1.8V minimum supply voltage, and 24LC00T-I/ST and 24LC00T/ST support 2.5V minimum supply voltage. These parts are suitable for low-power applications but require verification that system voltage levels remain within their specified ranges.

Frequently Asked Questions (FAQ)

Q: Can I use 24AA00T-I/ST as a direct replacement for 24C00T/ST?

A: Yes, with voltage verification. The 24AA00T-I/ST maintains identical memory specifications, I2C interface, and package type. However, it supports a lower minimum voltage (1.8V vs. 4.5V). Confirm your system operates within the 1.8V ~ 5.5V range of the 24AA00T-I/ST.

Q: What is the difference between 24C00T-I/ST and 24LC00T-I/ST?

A: Both parts are electrically equivalent with 400 kHz I2C operation and identical memory organization. The primary difference is voltage supply range: 24C00T-I/ST requires 4.5V ~ 5.5V, while 24LC00T-I/ST operates at 2.5V ~ 5.5V. Select based on your system's power supply specifications.

Q: Why would I choose 24C00T-E/ST over other substitutes?

A: The 24C00T-E/ST is the only substitute with extended temperature operation to 125°C. However, it operates at 100 kHz instead of 400 kHz. Select this part only if your application requires the extended upper temperature limit and can tolerate reduced I2C bus speed.

Q: Are all substitute parts in the same 8-TSSOP package?

A: Yes. All substitute parts listed use the 8-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring PCB layout compatibility with the original 24C00T/ST design.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All substitute parts are ROHS3 compliant, matching the environmental compliance status of the original 24C00T/ST.

Q: Can I use 24LC00T/ST in a system designed for 24C00T/ST?

A: Yes. The 24LC00T/ST is a direct functional equivalent with identical electrical specifications and operating temperature range (0°C ~ 70°C). The only difference is lower minimum voltage support (2.5V vs. 4.5V), which is not a limitation if your system operates above 4.5V.

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