Microchip 24C00/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The Microchip 24C00/ST is a 128-bit EEPROM memory IC with I2C interface operating at 400 kHz, housed in an 8-TSSOP surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering improved product status, extended operating temperature ranges, or broader supply voltage specifications.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	128 bit
Memory Organization	16 x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	4.6 µs
Write Cycle Time	4 ms
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24C00/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory size: 128 bit (16 x 8 organization)
Interface: I2C protocol
Package: 8-TSSOP surface mount
Access time: 4.6 µs or faster
Write cycle time: 4 ms
RoHS3 compliance

Allowed Variation Parameters:

Clock frequency: 100 kHz or 400 kHz (backward compatible)
Supply voltage range: May be broader than original specification
Operating temperature range: May be extended
Product status: Active status preferred over obsolete

All substitute parts listed maintain identical memory capacity, interface protocol, package footprint, and electrical timing characteristics. Variations in supply voltage and operating temperature represent improvements in application flexibility without compromising functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temperature	Package
24C00/ST	Microchip Technology	Obsolete	128 bit	400 kHz	4.6 µs	4.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP
24AA00-I/ST	Microchip Technology	Active	128 bit	400 kHz	3500 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP
24C00-E/ST	Microchip Technology	Active	128 bit	100 kHz	4.6 µs	4.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP
24C00-I/ST	Microchip Technology	Active	128 bit	400 kHz	4.6 µs	4.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP
24LC00-I/ST	Microchip Technology	Active	128 bit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP
24LC00/ST	Microchip Technology	Active	128 bit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP

Engineering Selection Recommendations

Primary Recommendation: 24C00-I/ST

The 24C00-I/ST is the direct functional equivalent with active product status. It maintains identical electrical specifications (400 kHz clock frequency, 4.6 µs access time, 4.5V ~ 5.5V supply voltage) while extending the operating temperature range to -40°C ~ 85°C. This part is suitable for applications requiring the original 24C00/ST performance with improved temperature coverage and guaranteed long-term availability.

Extended Temperature Range Option: 24C00-E/ST

The 24C00-E/ST operates at 100 kHz clock frequency with extended temperature range (-40°C ~ 125°C). Select this part for applications requiring operation beyond standard industrial temperature limits. The reduced clock frequency remains compatible with I2C protocol specifications.

Low Voltage Option: 24LC00-I/ST

The 24LC00-I/ST supports supply voltages as low as 2.5V while maintaining 400 kHz operation and -40°C ~ 85°C temperature range. This part is suitable for battery-powered or low-voltage applications requiring extended temperature performance.

Broadest Compatibility: 24AA00-I/ST

The 24AA00-I/ST offers the widest supply voltage range (1.8V ~ 5.5V) with active product status and extended temperature range (-40°C ~ 85°C). This part accommodates the broadest range of application requirements including ultra-low-voltage systems.

All substitute parts maintain ROHS3 compliance, identical package footprint, and functional I2C interface compatibility with the original 24C00/ST.

Frequently Asked Questions (FAQ)

Q: Can I use 24LC00-I/ST as a direct replacement for 24C00/ST?

A: Yes. The 24LC00-I/ST maintains identical memory capacity (128 bit), I2C interface, 400 kHz clock frequency, 4.6 µs access time, and 8-TSSOP package. The primary differences are extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C) and broader supply voltage specification (2.5V ~ 5.5V versus 4.5V ~ 5.5V). These represent functional improvements for most applications.

Q: What is the difference between 24C00-I/ST and 24AA00-I/ST?

A: Both parts are active and support 400 kHz I2C operation with identical memory organization. The 24AA00-I/ST supports lower supply voltages (1.8V minimum versus 4.5V minimum) and is suitable for applications requiring operation below 4.5V. The 24C00-I/ST maintains the original supply voltage specification of 4.5V ~ 5.5V.

Q: Why would I select 24C00-E/ST over other options?

A: The 24C00-E/ST is the only substitute offering extended temperature range to 125°C. Select this part for applications requiring operation in high-temperature environments. The 100 kHz clock frequency is fully compatible with I2C protocol and suitable for applications not requiring 400 kHz operation.

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

A: Yes. All substitute parts use the 8-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility with the original 24C00/ST.

Q: Do all substitute parts have the same RoHS compliance status?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original part's compliance profile.

Q: Which substitute part has the best availability?

A: The 24LC00-I/ST has the highest current inventory (33,300 pcs) among all substitute options, providing the best supply assurance for production requirements.

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