AT24CS04-SSHM-B Equivalent & Substitute Parts

Part Overview

The AT24CS04-SSHM-B is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C serial interface operation at 1 MHz with 550 ns access time. This device is packaged in 8-SOIC surface mount configuration and operates across a wide supply voltage range of 1.7V to 5.5V, making it suitable for embedded systems, IoT applications, and industrial control circuits requiring non-volatile data storage.

The part is currently in Active product status with 992 units in stock. Equivalent and substitute parts are identified based on matching core electrical parameters: 4Kbit memory capacity, 512 x 8 memory organization, I2C interface protocol, 8-SOIC package, and compatible operating temperature ranges. Substitutes may vary in clock frequency, access time, and supply voltage specifications while maintaining functional compatibility for most applications.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT24CS04-SSHM-B is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes must provide 4Kbit capacity in 512 x 8 organization to ensure data storage compatibility
Interface Protocol: I2C serial interface is mandatory for bus-level compatibility
Package Type: 8-SOIC surface mount package ensures mechanical and thermal compatibility with existing PCB layouts
Supply Voltage Compatibility: Substitute parts must operate within overlapping voltage ranges with the main part (minimum 1.7V to 5.5V envelope)
Operating Temperature Range: Substitutes must support at least the -40°C to 85°C range or equivalent industrial specifications

Substitutes are grouped into two categories: parametric equivalents (matching all electrical specifications) and manufacturer-recommended alternatives (meeting core functional requirements with variations in clock frequency or access time).

Parameter Comparison

Parameter	AT24CS04-SSHM-B	AT24C04C-SSHM-B	CAT24C04WI-GT3	CAV24C04WE-GT3	M24C04-WMN6TP
Manufacturer	Microchip Technology	Microchip Technology	Catalyst Semiconductor Inc.	onsemi	STMicroelectronics
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit	4Kbit
Memory Organization	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8
Memory Interface	I2C	I2C	I2C	I2C	I2C
Clock Frequency	1 MHz	1 MHz	Not Specified	400 kHz	400 kHz
Access Time	550 ns	550 ns	Not Specified	900 ns	900 ns
Write Cycle Time	5 ms	5 ms	Not Specified	5 ms	5 ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	Not Specified	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Not Specified	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	Not Specified	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Not Specified	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant	ROHS3 Compliant
Inventory Availability	992 Pcs	21000 Pcs	224300 Pcs	1206 Pcs	65134 Pcs

Engineering Selection Recommendations

AT24C04C-SSHM-B (Microchip Technology): This is the primary parametric equivalent, matching all electrical specifications of the AT24CS04-SSHM-B including 1 MHz clock frequency, 550 ns access time, and 1.7V to 5.5V supply range. Both devices are Active status products with ROHS3 compliance. The AT24C04C-SSHM-B offers significantly higher inventory availability (21000 units) and verified DiGi-Electronics programmability, making it the preferred direct replacement for new designs and production restocking.

CAT24C04WI-GT3 (Catalyst Semiconductor Inc.): This substitute provides 4Kbit I2C EEPROM functionality in compatible packaging with the lowest moisture sensitivity level (MSL 1, Unlimited). Extensive inventory availability (224300 units) supports high-volume applications. Specific electrical parameters are not detailed in available documentation; compatibility verification is recommended for timing-critical applications.

CAV24C04WE-GT3 (onsemi): This automotive-grade substitute operates at 400 kHz clock frequency with 900 ns access time, representing a performance reduction compared to the main part. However, it extends the operating temperature range to -40°C to 125°C and includes AEC-Q100 automotive qualification. This part is suitable for applications requiring extended temperature operation or automotive compliance. Supply voltage range is 2.5V to 5.5V, which is compatible with most 3.3V and 5V systems but excludes ultra-low voltage applications below 2.5V.

M24C04-WMN6TP (STMicroelectronics): This substitute matches the onsemi CAV24C04WE-GT3 in electrical specifications (400 kHz, 900 ns access time, 2.5V to 5.5V supply). The part is marked "Not For New Designs" status, indicating end-of-life trajectory. Substantial inventory (65134 units) remains available for legacy system support and maintenance applications. This part is suitable only for replacement in existing designs, not for new product development.

Frequently Asked Questions (FAQ)

Q: Can AT24C04C-SSHM-B directly replace AT24CS04-SSHM-B without circuit modifications?

A: Yes. Both parts share identical electrical specifications (1 MHz I2C, 550 ns access time, 1.7V to 5.5V supply), 8-SOIC package dimensions, and operating temperature range (-40°C to 85°C). No circuit modifications are required for direct substitution.

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

A: Clock frequency determines the maximum I2C bus speed. The 1 MHz variants (AT24CS04-SSHM-B, AT24C04C-SSHM-B) support faster data transfer rates, while 400 kHz variants (CAV24C04WE-GT3, M24C04-WMN6TP) operate at standard I2C speed. Both are compatible with I2C bus protocols; selection depends on system timing requirements. Lower frequency parts typically exhibit longer access times (900 ns vs. 550 ns).

Q: Are 2.5V to 5.5V supply range parts compatible with 1.7V to 5.5V designs?

A: Partial compatibility exists. Parts specified for 2.5V to 5.5V cannot operate below 2.5V supply voltage. If your application requires operation at 1.7V to 2.4V, only AT24CS04-SSHM-B or AT24C04C-SSHM-B are suitable. For systems operating at 2.5V and above, all substitutes are compatible.

Q: What does "Not For New Designs" status mean for M24C04-WMN6TP?

A: This designation indicates the manufacturer has discontinued active development and recommends against using this part in new product designs. The part remains available for legacy system maintenance and repair. For new designs, select AT24C04C-SSHM-B, CAT24C04WI-GT3, or CAV24C04WE-GT3 instead.

Q: Is the 8-SOIC package identical across all substitute parts?

A: Yes. All specified substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and reflow soldering processes. No footprint modifications are required.

Q: Which substitute offers the best long-term availability?

A: CAT24C04WI-GT3 (Catalyst Semiconductor Inc.) provides the highest inventory level (224300 units) and lowest moisture sensitivity (MSL 1, Unlimited), supporting sustained production and long-term supply chain stability. AT24C04C-SSHM-B (21000 units) is the second choice for Microchip-based designs.

Q: Can CAV24C04WE-GT3 be used in industrial temperature applications?

A: Yes. CAV24C04WE-GT3 extends the operating temperature range to -40°C to 125°C and includes AEC-Q100 automotive qualification, making it suitable for industrial and automotive environments requiring extended temperature operation beyond the standard -40°C to 85°C range.

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