24LC04B-I/STG EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC04B-I/STG is a 4Kbit I2C EEPROM memory IC manufactured by Microchip Technology in an 8-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 2.5V to 5.5V supply range with an industrial temperature rating of -40°C to 85°C, serving applications requiring non-volatile serial memory with I2C interface compatibility.

Key Parameters

Parameter	24LC04B-I/STG
Memory Size	4Kbit
Memory Organization	256 x 8 x 2
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC04B-I/STG is determined by the following critical parameters: memory size (4Kbit), memory interface (I2C), package type (8-TSSOP), and supply voltage compatibility (2.5V ~ 5.5V minimum). Clock frequency, access time, and operating temperature range are secondary parameters that define performance tier compatibility.

Substitute parts are grouped into three categories:

Direct Parametric Equivalents maintain identical electrical and mechanical specifications, including 400 kHz clock frequency, 900 ns access time, and -40°C to 85°C operating range.

Enhanced Performance Substitutes offer higher clock frequency (1 MHz) and faster access time (400 ns) while maintaining 4Kbit capacity and I2C interface, suitable for applications requiring improved performance margins.

Extended Temperature Substitutes provide -40°C to 125°C operating range with identical or enhanced performance characteristics, applicable to industrial and automotive environments.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Organization	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC04B-I/STG	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24LC04B-I/ST	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC04B-E/ST	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC04BH-E/ST	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC044-I/ST	Microchip	4Kbit	256 x 8 x 2	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC044-E/ST	Microchip	4Kbit	256 x 8 x 2	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA04-I/ST	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA044-I/ST	Microchip	4Kbit	256 x 8 x 2	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA044-E/ST	Microchip	4Kbit	256 x 8 x 2	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA04H-I/ST	Microchip	4Kbit	256 x 8 x 2	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC04B-I/ST16KVAO	Microchip	4Kbit	512 x 8	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation: 24LC04B-I/ST

The 24LC04B-I/ST is the direct active equivalent to the obsolete 24LC04B-I/STG. It maintains identical electrical specifications (400 kHz I2C, 900 ns access time, 2.5V to 5.5V supply) and mechanical packaging (8-TSSOP). This part is actively produced and verified for programmability, making it the preferred replacement for direct substitution without design modification.

Extended Temperature Alternative: 24LC04B-E/ST

For applications requiring extended operating temperature range (-40°C to 125°C), the 24LC04B-E/ST provides identical electrical performance with enhanced thermal capability. This part is actively produced and verified for programmability.

Enhanced Performance Option: 24LC044-I/ST or 24LC044-E/ST

When improved I2C clock frequency (1 MHz) and faster access time (400 ns) are beneficial, the 24LC044 series offers performance enhancement while maintaining 4Kbit capacity and 8-TSSOP packaging. The 24LC044-I/ST covers -40°C to 85°C, while 24LC044-E/ST extends to -40°C to 125°C.

Low-Voltage Compatible Option: 24AA04-I/ST or 24AA04H-I/ST

For applications requiring lower minimum supply voltage (1.7V), the 24AA series provides equivalent 400 kHz performance. The 24AA04H-I/ST variant is actively produced and maintains identical electrical specifications with expanded voltage range.

Automotive Grade Option: 24LC04B-I/ST16KVAO

For automotive applications requiring AEC-Q100 qualification, the 24LC04B-I/ST16KVAO provides identical electrical performance with automotive-grade certification. Note: memory organization differs (512 x 8 vs. 256 x 8 x 2), requiring design verification.

All recommended substitutes are ROHS3 compliant and carry identical REACH and ECCN classifications as the original part.

Frequently Asked Questions (FAQ)

Q: Can 24LC04B-I/ST directly replace 24LC04B-I/STG without design changes?

A: Yes. The 24LC04B-I/ST is a direct parametric equivalent with identical I2C clock frequency (400 kHz), access time (900 ns), supply voltage range (2.5V to 5.5V), operating temperature (-40°C to 85°C), and 8-TSSOP package. No design modifications are required.

Q: What is the difference between 24LC04B and 24LC044 variants?

A: The 24LC044 operates at 1 MHz I2C clock frequency with 400 ns access time, compared to 24LC04B at 400 kHz and 900 ns. Both maintain 4Kbit capacity and 8-TSSOP packaging. The 24LC044 is suitable for applications requiring faster I2C communication.

Q: Can I use 24AA04 series parts as substitutes?

A: Yes, with voltage consideration. The 24AA04 series supports lower minimum supply voltage (1.7V vs. 2.5V) while maintaining identical I2C performance and packaging. This provides additional design flexibility for low-voltage applications.

Q: What is the significance of the -E and -I temperature grade designations?

A: The -I designation indicates industrial temperature range (-40°C to 85°C). The -E designation indicates extended temperature range (-40°C to 125°C). Select based on application thermal requirements.

Q: Is the 24LC04B-I/ST16KVAO suitable as a direct replacement?

A: The 24LC04B-I/ST16KVAO provides identical electrical performance and AEC-Q100 automotive qualification. However, memory organization differs (512 x 8 vs. 256 x 8 x 2). Design verification is required before substitution in automotive applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification identical to the original 24LC04B-I/STG.

Q: What packaging format is used for these parts?

A: All substitute parts use 8-TSSOP (Thin Shrink Small Outline Package) with 0.173" width and 4.40mm body width, maintaining identical PCB footprint compatibility.

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