AT24C04B-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C04B-TH-B is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time in an 8-TSSOP surface mount package. The device is classified as obsolete product status, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts are selected based on matching electrical specifications, mechanical compatibility, and functional equivalence within the 4Kbit I2C EEPROM category.

Key Parameters

Parameter	AT24C04B-TH-B
Memory Size	4Kbit
Memory Format	EEPROM
Memory Organization	512 x 8
Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Supply Voltage	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical parameter alignment with the AT24C04B-TH-B:

Direct Manufacturer Substitutes maintain identical or superior electrical specifications across all critical parameters: 4Kbit memory size, 512 x 8 organization, I2C interface, 1 MHz clock frequency, 550 ns access time, 5 ms write cycle time, and 8-TSSOP package compatibility. These parts are functionally interchangeable without design modification.

Manufacturer Recommended Substitutes provide functional equivalence with minor parameter variations. Parts operating at 400 kHz clock frequency (versus 1 MHz) or 900 ns access time (versus 550 ns) remain compatible within I2C protocol specifications and maintain identical memory capacity, organization, voltage range, temperature range, and package form factor.

Parametric Equivalents from alternative manufacturers (Rohm Semiconductor, Catalyst Semiconductor, onsemi) deliver matching electrical performance and package compatibility while offering active product status and verified programmability certifications.

Critical parameters determining substitution eligibility: 4Kbit memory capacity, 512 x 8 organization, I2C interface, 8-TSSOP package, -40°C to 85°C operating temperature, and 1.6V to 5.5V supply voltage range.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Clock Frequency	Access Time	Supply Voltage	Product Status	Package	Inventory
AT24C04B-TH-B	Microchip Technology	4Kbit	512 x 8	1 MHz	550 ns	1.8V ~ 5.5V	Obsolete	8-TSSOP	1036 Pcs
AT24C04C-XHM-B	Microchip Technology	4Kbit	512 x 8	1 MHz	550 ns	1.7V ~ 5.5V	Active	8-TSSOP	18651 Pcs
24AA04-I/ST	Microchip Technology	4Kbit	256 x 8 x 2	400 kHz	900 ns	1.7V ~ 5.5V	Active	8-TSSOP	20340 Pcs
AT24CS04-XHM-T	Microchip Technology	4Kbit	512 x 8	1 MHz	550 ns	1.7V ~ 5.5V	Active	8-TSSOP	25680 Pcs
AT24HC04B-TH-B	Microchip Technology	4Kbit	512 x 8	1 MHz	550 ns	1.8V ~ 5.5V	Active	8-TSSOP	5080 Pcs
BR24G04FVT-3AGE2	Rohm Semiconductor	4Kbit	512 x 8	1 MHz	Not specified	1.6V ~ 5.5V	Active	8-TSSOP-B	845 Pcs
BR24G04FVT-3GE2	Rohm Semiconductor	4Kbit	512 x 8	400 kHz	Not specified	1.6V ~ 5.5V	Active	8-TSSOP-B	1900 Pcs
BR24L04FVT-WE2	Rohm Semiconductor	4Kbit	512 x 8	400 kHz	Not specified	1.8V ~ 5.5V	Active	8-TSSOP-B	3840 Pcs
BR24T04FVT-WE2	Rohm Semiconductor	4Kbit	512 x 8	400 kHz	Not specified	1.6V ~ 5.5V	Active	8-TSSOP-B	1104 Pcs
CAT24C04YI-G	Catalyst Semiconductor Inc.	4Kbit	512 x 8	400 kHz	900 ns	1.7V ~ 5.5V	Active	8-TSSOP	1474 Pcs
CAT24C04YI-GT3	onsemi	4Kbit	512 x 8	400 kHz	900 ns	1.7V ~ 5.5V	Active	8-TSSOP	74400 Pcs

Engineering Selection Recommendations

Primary Recommendation: AT24C04C-XHM-B

AT24C04C-XHM-B from Microchip Technology is the direct successor to the obsolete AT24C04B-TH-B. This part maintains identical electrical specifications (1 MHz operation, 550 ns access time, 512 x 8 organization) with expanded supply voltage range (1.7V minimum versus 1.8V) and active product status. Inventory availability of 18,651 units supports production continuity. RoHS3 compliance and REACH unaffected status match the original part.

Secondary Recommendation: AT24CS04-XHM-T

AT24CS04-XHM-T provides equivalent electrical performance with 1 MHz clock frequency and 550 ns access time. Highest inventory availability (25,680 units) ensures supply security. Tape & Reel packaging accommodates automated assembly processes. Active product status with verified compliance certifications.

Alternative Recommendation: AT24HC04B-TH-B

AT24HC04B-TH-B offers parametric equivalence with verified DiGi-Electronics programmability certification. Maintains 1 MHz operation and 550 ns access time with identical voltage and temperature specifications. Lower inventory (5,080 units) but suitable for applications requiring verified programmability.

Cross-Manufacturer Options: Rohm Semiconductor BR24 Series

BR24G04FVT-3AGE2 and BR24L04FVT-WE2 provide active alternatives with 4Kbit capacity and 512 x 8 organization. BR24L04FVT-WE2 includes verified programmability certification. Extended supply voltage range (1.6V minimum) offers broader compatibility. 400 kHz operation remains within I2C protocol specifications.

onsemi CAT24C04YI-GT3

CAT24C04YI-GT3 delivers highest inventory availability (74,400 units) with verified programmability certification and unlimited moisture sensitivity level. 400 kHz operation and 900 ns access time remain functionally compatible within I2C specifications.

Frequently Asked Questions (FAQ)

Q: Can AT24C04C-XHM-B directly replace AT24C04B-TH-B without design changes?

A: Yes. AT24C04C-XHM-B maintains identical electrical specifications (1 MHz, 550 ns access time, 512 x 8 organization, 8-TSSOP package) and is the direct active successor. The expanded minimum supply voltage (1.7V versus 1.8V) provides additional design margin.

Q: What is the functional difference between 1 MHz and 400 kHz clock frequency options?

A: Clock frequency determines I2C bus speed capability. 1 MHz parts support fast-mode I2C operation; 400 kHz parts operate at standard-mode. Both are I2C protocol compliant. Selection depends on system bus speed requirements. Lower frequency parts introduce longer access times but remain functionally equivalent for 4Kbit EEPROM applications.

Q: Are 8-TSSOP and 8-TSSOP-B packages mechanically interchangeable?

A: Both packages maintain identical 0.173" width and 4.40mm dimensions specified for 8-TSSOP. Mechanical compatibility is confirmed. Verify PCB footprint design accommodates the specific package variant during layout.

Q: Which substitute part offers the best supply availability?

A: CAT24C04YI-GT3 (onsemi) provides highest inventory at 74,400 units with verified programmability certification and unlimited moisture sensitivity level, supporting high-volume production requirements.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the original AT24C04B-TH-B compliance status.

Q: What is the significance of DiGi-Electronics Programmable verification?

A: Verified programmability indicates the part has been tested and confirmed compatible with standard EEPROM programming equipment and procedures. Non-verified parts may require additional validation before production deployment.

Q: Can parts with different memory organization (256 x 8 x 2 versus 512 x 8) be substituted?

A: 24AA04-I/ST features 256 x 8 x 2 organization versus standard 512 x 8. While total capacity remains 4Kbit, internal addressing differs. Substitution requires verification that application firmware accommodates the alternative organization scheme.

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