AT24C04B-TSU-T Equivalent & Substitute Parts

Part Overview

The AT24C04B-TSU-T is a 4Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This part operates at 1 MHz clock frequency with 550 ns access time in SOT-23-5 surface mount packaging. The product status is obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Format	EEPROM
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	SOT-23-5
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT24C04B-TSU-T is determined by the following critical parameters: 4Kbit memory capacity, EEPROM non-volatile format, I2C serial interface, SOT-23-5 package compatibility, and supply voltage range overlap. The main part operates at 1 MHz with 550 ns access time. Substitute parts fall into two functional groups:

Group 1: Direct Functional Equivalents (1 MHz Operation) Parts maintaining 1 MHz clock frequency and 550 ns or faster access time with compatible voltage ranges and SOT-23-5 packaging. These provide identical electrical performance characteristics.

Group 2: Compatible Alternatives (400 kHz Operation) Parts operating at 400 kHz clock frequency with 900 ns access time. These deliver reduced speed performance but maintain 4Kbit capacity, I2C interface, SOT-23-5 packaging, and overlapping voltage specifications. Functional compatibility is confirmed through identical memory organization and write cycle timing.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
AT24C04B-TSU-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Obsolete
AT24CS04-STUM-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
S-24C04DI-M5T1U5	ABLIC Inc.	4Kbit	1 MHz	500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
24AA04HT-I/OT	Microchip Technology	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
24AA04T-I/OT	Microchip Technology	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
24LC04BHT-E/OT	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	Active
24LC04BHT-I/OT	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
24LC04BT-E/OT	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	Active
24LC04BT-I/OT	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active
CAT24C04TDI-GT3	onsemi	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	SOT-23-5	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

AT24CS04-STUM-T and S-24C04DI-M5T1U5 are the preferred substitutes. Both maintain 1 MHz clock frequency and 550 ns or faster access time, delivering identical electrical performance to the obsolete AT24C04B-TSU-T. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. AT24CS04-STUM-T is manufactured by Microchip Technology, the original manufacturer, ensuring design continuity. S-24C04DI-M5T1U5 from ABLIC Inc. offers 500 ns access time, exceeding the original specification.

Secondary Substitutes (Compatible with Performance Trade-off)

24AA04HT-I/OT, 24AA04T-I/OT, 24LC04BHT-I/OT, 24LC04BT-I/OT, and CAT24C04TDI-GT3 operate at 400 kHz with 900 ns access time. These parts are functionally compatible for applications where reduced I2C clock speed is acceptable. All are active products with ROHS3 compliance. The 24LC04B series (24LC04BHT-E/OT, 24LC04BHT-I/OT, 24LC04BT-E/OT, 24LC04BT-I/OT) support extended operating temperature to 125°C, suitable for high-temperature environments. Voltage supply range for 24LC04B variants begins at 2.5V, which may limit use in low-voltage applications below 2.5V.

Compliance and Certification

All substitute parts carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original part's environmental certifications. All parts are classified under ECCN EAR99 and HTSUS 8542.32.0051.

Frequently Asked Questions (FAQ)

Q: Can 24LC04BT-I/OT replace AT24C04B-TSU-T in a 1.8V supply application?

A: No. The 24LC04BT-I/OT minimum supply voltage is 2.5V, while the original part operates from 1.8V. Use AT24CS04-STUM-T or S-24C04DI-M5T1U5 for low-voltage applications.

Q: What is the functional difference between 1 MHz and 400 kHz variants?

A: Clock frequency determines I2C bus speed. 1 MHz parts (AT24CS04-STUM-T, S-24C04DI-M5T1U5) support faster data transfer with 550 ns or better access time. 400 kHz parts deliver slower I2C communication with 900 ns access time. Both maintain identical 4Kbit capacity and 5ms write cycle time.

Q: Are all substitute parts available in SOT-23-5 packaging?

A: Yes. All listed substitutes use SOT-23-5 surface mount packaging, ensuring mechanical and electrical compatibility with the original footprint.

Q: Which substitute offers the best performance match?

A: AT24CS04-STUM-T provides the closest match, maintaining 1 MHz operation, 550 ns access time, and Microchip Technology manufacturing. S-24C04DI-M5T1U5 from ABLIC Inc. offers superior 500 ns access time at 1 MHz.

Q: Can I use CAT24C04TDI-GT3 from onsemi as a substitute?

A: Yes, for applications tolerating 400 kHz I2C speed and 900 ns access time. The part is active, ROHS3 compliant, and supports 1.7V to 5.5V supply range matching the original specification.

Q: What is the inventory status of substitute parts?

A: AT24CS04-STUM-T has 3,300 units in stock. 24LC04BT-E/OT has the highest availability at 28,836 units. S-24C04DI-M5T1U5 has 1,134 units available. All substitutes are active products with ongoing supply.

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