Microchip 24LC04B/ST EEPROM 4Kbit I2C Memory - Equivalent & Substitute Parts

Part Overview

The Microchip 24LC04B/ST is a 4Kbit non-volatile EEPROM memory IC with I2C interface, packaged in 8-TSSOP surface mount configuration. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
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	0°C ~ 70°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Core Electrical Compatibility Requirements:

Memory Size: 4Kbit (fixed requirement)
Memory Organization: 256 x 8 x 2 (fixed requirement)
Memory Interface: I2C (fixed requirement)
Package Type: 8-TSSOP (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Variable Parameters Allowing Substitution:

Clock Frequency: 400 kHz or higher
Access Time: 900 ns or faster
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Extended ranges acceptable
DiGi-Electronics Programmable verification status

The following parts meet substitution criteria:

Group 1 - Direct Electrical Equivalents (400 kHz, 900 ns):

24LC04B-E/ST
24LC04B-I/ST

Group 2 - Enhanced Performance Substitutes (1 MHz, 400 ns):

24AA044-I/ST

Group 3 - Extended Supply Range Substitutes (1.7V ~ 5.5V):

24AA04-I/ST

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Programmable Verified	Inventory
24LC04B/ST	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Yes	950 Pcs
24LC04B-E/ST	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Yes	5984 Pcs
24LC04B-I/ST	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes	2100 Pcs
24AA04-I/ST	Microchip Technology	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	No	20340 Pcs
24AA044-I/ST	Microchip Technology	4Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	No	832 Pcs

Engineering Selection Recommendations

Primary Substitutes (Verified Programmable Status):

24LC04B-E/ST and 24LC04B-I/ST are direct electrical equivalents with identical clock frequency and access time specifications. Both parts carry DiGi-Electronics Programmable verification status matching the main part. Selection between these two depends on operating temperature requirements: 24LC04B-E/ST supports -40°C ~ 125°C, while 24LC04B-I/ST supports -40°C ~ 85°C.

Secondary Substitutes (Extended Capabilities):

24AA04-I/ST provides extended supply voltage range (1.7V ~ 5.5V) with identical electrical performance at 400 kHz and 900 ns. This part lacks programmable verification but offers higher inventory availability (20340 Pcs).

24AA044-I/ST delivers enhanced performance with 1 MHz clock frequency and 400 ns access time, suitable for applications requiring faster I2C communication. Extended supply range (1.7V ~ 5.5V) and temperature range (-40°C ~ 85°C) are provided. Programmable verification status is not confirmed.

Compliance Status:

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and identical ECCN/HTSUS classifications as the main part.

Frequently Asked Questions (FAQ)

Q: Can 24LC04B-E/ST replace 24LC04B/ST in all applications?

A: Yes. 24LC04B-E/ST is electrically identical with matching 400 kHz clock frequency and 900 ns access time. Both parts are DiGi-Electronics Programmable verified. The primary difference is extended operating temperature range (-40°C ~ 125°C vs. 0°C ~ 70°C), which provides broader environmental compatibility.

Q: What is the difference between 24LC04B-I/ST and 24AA04-I/ST?

A: Both parts operate at 400 kHz with 900 ns access time in 8-TSSOP packaging. 24AA04-I/ST extends the supply voltage range to 1.7V ~ 5.5V compared to 24LC04B-I/ST at 2.5V ~ 5.5V. 24LC04B-I/ST carries programmable verification; 24AA04-I/ST does not.

Q: When should 24AA044-I/ST be selected?

A: 24AA044-I/ST is appropriate when I2C communication speed exceeds 400 kHz requirements. This part supports 1 MHz clock frequency with 400 ns access time. Extended supply range (1.7V ~ 5.5V) and temperature range (-40°C ~ 85°C) are available. Programmable verification is not confirmed for this variant.

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

A: Yes. All listed substitute parts use identical 8-TSSOP (0.173", 4.40mm Width) surface mount packaging, ensuring mechanical compatibility without PCB layout modifications.

Q: Do substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed are RoHS3 compliant with REACH unaffected status, matching the main part's regulatory classification.

Q: What inventory considerations apply to substitute selection?

A: 24AA04-I/ST offers the highest inventory availability at 20340 Pcs. 24LC04B-E/ST provides 5984 Pcs. 24LC04B-I/ST and 24AA044-I/ST have lower stock levels at 2100 Pcs and 832 Pcs respectively.

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