AT24C256C-SSPD-T Equivalent & Substitute Parts

Part Overview

The AT24C256C-SSPD-T is a 256Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 900 ns access time. This component operates across a wide voltage range of 2.5V to 5.5V and maintains automotive-grade qualification under AEC-Q100 standards. The device is actively produced and available in high inventory volumes, making it suitable for applications requiring non-volatile memory storage with I2C serial communication.

Substitute parts become necessary when addressing supply chain constraints, inventory availability, or specific application requirements such as enhanced performance characteristics or alternative packaging configurations.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
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 ~ 125°C
Package Type	8-SOIC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT24C256C-SSPD-T is determined by strict alignment with the following core parameters: 256Kbit memory capacity, 32K x 8 organization, I2C interface protocol, 8-SOIC package form factor, and compliance with ROHS3 standards. All identified substitute parts maintain these critical specifications.

The substitute parts are categorized as follows:

Parametric Equivalent (24LC256T-E/SN): Identical electrical specifications including 400 kHz clock frequency, 900 ns access time, and 2.5V to 5.5V supply voltage. Differs in packaging configuration (Cut Tape & Digi-Reel) and moisture sensitivity level.

Direct Manufacturer Alternative (CAV24C256WE-GT3): Meets core memory and interface requirements with enhanced clock frequency of 1 MHz and faster access time of 400 ns. Maintains automotive-grade AEC-Q100 qualification and identical supply voltage range.

MFR Recommended Alternative (BR24S256FJ-WE2): Meets core memory and interface specifications with extended lower voltage support (1.7V minimum) and reduced operating temperature maximum of 85°C. Supplied in 8-SOP-J package variant.

Parameter Comparison

Parameter	AT24C256C-SSPD-T	24LC256T-E/SN	CAV24C256WE-GT3	BR24S256FJ-WE2
Manufacturer	Microchip Technology	Microchip Technology	onsemi	Rohm Semiconductor
Memory Size	256Kbit	256Kbit	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8	32K x 8	32K x 8
Memory Interface	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	1 MHz	400 kHz
Access Time	900 ns	900 ns	400 ns	Not specified
Write Cycle Time	5ms	5ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC
AEC-Q100 Qualification	Yes	No	Yes	No
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Automotive Applications: The AT24C256C-SSPD-T and CAV24C256WE-GT3 are both qualified to AEC-Q100 standards and support the full operating temperature range of -40°C to 125°C. These parts are suitable for automotive-grade implementations. The CAV24C256WE-GT3 offers enhanced performance with 1 MHz clock frequency and 400 ns access time.

For Standard Industrial Applications: The 24LC256T-E/SN provides parametric equivalence with identical electrical specifications and is actively produced with verified programmability status. The BR24S256FJ-WE2 extends voltage support to 1.7V minimum, beneficial for low-power applications, though it operates to a maximum temperature of 85°C.

For Supply Chain Flexibility: All four parts maintain 256Kbit capacity, I2C interface, 8-SOIC packaging, and ROHS3 compliance. Selection should prioritize inventory availability, delivery timeline, and specific application temperature and voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can the 24LC256T-E/SN directly replace the AT24C256C-SSPD-T in automotive applications?

A: The 24LC256T-E/SN is not qualified to AEC-Q100 standards. For automotive-grade applications requiring AEC-Q100 qualification, use the AT24C256C-SSPD-T or CAV24C256WE-GT3.

Q: What is the primary difference between CAV24C256WE-GT3 and the main part?

A: The CAV24C256WE-GT3 operates at 1 MHz clock frequency with 400 ns access time, compared to 400 kHz and 900 ns for the AT24C256C-SSPD-T. Both maintain AEC-Q100 qualification and identical supply voltage range.

Q: Is the BR24S256FJ-WE2 suitable for high-temperature applications?

A: The BR24S256FJ-WE2 operates to a maximum temperature of 85°C, which is lower than the AT24C256C-SSPD-T maximum of 125°C. For applications requiring operation above 85°C, use the main part or CAV24C256WE-GT3.

Q: Are all substitute parts available in 8-SOIC packaging?

A: All substitute parts use 8-SOIC package form factor, ensuring mechanical and electrical compatibility with the AT24C256C-SSPD-T footprint.

Q: What is the moisture sensitivity level difference between the main part and substitutes?

A: The AT24C256C-SSPD-T has MSL 3 (168 hours), while 24LC256T-E/SN, CAV24C256WE-GT3, and BR24S256FJ-WE2 have MSL 1 (Unlimited). Lower MSL values indicate greater tolerance to moisture exposure during storage and handling.

Q: Can I use BR24S256FJ-WE2 in applications requiring 2.5V minimum supply voltage?

A: Yes. The BR24S256FJ-WE2 supports 1.7V to 5.5V supply voltage range, which encompasses the 2.5V minimum requirement and provides additional flexibility for lower-voltage applications.

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