AT24CS16-XHM-B Equivalent & Substitute Parts

Part Overview

The AT24CS16-XHM-B is a 16Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device is actively produced and widely used in embedded systems requiring non-volatile serial memory storage. The part is available in 8-TSSOP surface mount packaging with a supply voltage range of 1.7V to 5.5V and operating temperature range of -40°C to 85°C. Finding equivalent or substitute parts may be necessary due to inventory constraints, lead time requirements, or specific application needs while maintaining functional compatibility.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 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

Substitute Part Grouping Explanation

Substitute parts for the AT24CS16-XHM-B are classified based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Memory Size: 16Kbit (mandatory)
Memory Organization: 2K x 8 (mandatory)
Memory Interface: I2C (mandatory)
Package Type: 8-TSSOP (mandatory)
Voltage Supply Range: Must encompass or match 1.7V ~ 5.5V
Write Cycle Time: 5ms (mandatory)
RoHS Compliance: ROHS3 Compliant (mandatory)

Parametric Equivalent Category: Parts meeting all primary criteria with identical or superior electrical performance characteristics.

Manufacturer Recommended Category: Parts meeting all primary criteria with acceptable performance variations in clock frequency or access time, suitable for applications where timing margins permit.

Parameter Comparison

Parameter	AT24CS16-XHM-B (Main)	AT24C16C-XHM-B (Parametric Equivalent)	CAT24C16YI-GT3 (MFR Recommended)	CAV24C16YE-GT3 (MFR Recommended)
Manufacturer	Microchip Technology	Microchip Technology	onsemi	onsemi
Memory Size	16Kbit	16Kbit	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8	2K x 8	2K x 8
Memory Interface	I2C	I2C	I2C	I2C
Clock Frequency	1 MHz	1 MHz	400 kHz	400 kHz
Access Time	550 ns	550 ns	900 ns	900 ns
Write Cycle Time	5ms	5ms	5ms	5ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Packaging Format	Tube	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	No	No	No	Yes (AEC-Q100)

Engineering Selection Recommendations

AT24C16C-XHM-B (Parametric Equivalent): This part is a direct parametric equivalent to the AT24CS16-XHM-B, manufactured by the same supplier (Microchip Technology). It maintains identical electrical specifications including clock frequency, access time, and voltage supply range. Both parts are Active status products with ROHS3 compliance. This substitute is suitable for direct replacement in all applications where the AT24CS16-XHM-B is specified.

CAT24C16YI-GT3 (onsemi): This part meets all mandatory substitution criteria with identical memory capacity, organization, interface, and package type. The clock frequency is reduced to 400 kHz and access time is 900 ns compared to the main part's 1 MHz and 550 ns respectively. This part is suitable for applications where I2C bus timing permits lower clock frequencies. Moisture sensitivity is improved (MSL 1 vs. MSL 3). Packaging is Tape & Reel format rather than Tube.

CAV24C16YE-GT3 (onsemi, Automotive Grade): This part meets all mandatory substitution criteria and is qualified to AEC-Q100 automotive standards with extended operating temperature range (-40°C to 125°C). The minimum supply voltage is 2.5V, which excludes applications requiring operation below 2.5V. Clock frequency and access time are identical to CAT24C16YI-GT3. This part is appropriate for automotive applications or systems requiring extended temperature operation and automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can AT24C16C-XHM-B replace AT24CS16-XHM-B without design changes?

A: Yes. AT24C16C-XHM-B is a parametric equivalent with identical electrical specifications, package type, and voltage supply range. No design modifications are required.

Q: What is the primary difference between CAT24C16YI-GT3 and the main part?

A: CAT24C16YI-GT3 operates at 400 kHz I2C clock frequency versus 1 MHz for AT24CS16-XHM-B, and has 900 ns access time versus 550 ns. Both parts are functionally compatible with I2C protocol. Verify that your application's I2C bus timing accommodates the lower clock frequency.

Q: Is CAV24C16YE-GT3 suitable for all applications using AT24CS16-XHM-B?

A: CAV24C16YE-GT3 is suitable only for applications with supply voltage of 2.5V or higher. The minimum supply voltage specification is 2.5V ~ 5.5V, compared to 1.7V ~ 5.5V for the main part. Verify your system's minimum supply voltage before selection.

Q: What does AEC-Q100 qualification mean for CAV24C16YE-GT3?

A: AEC-Q100 is an automotive industry standard qualification. CAV24C16YE-GT3 meets automotive reliability and quality requirements. This part is appropriate for automotive applications or systems requiring automotive-grade component reliability.

Q: Are there packaging format differences between these parts?

A: AT24CS16-XHM-B and AT24C16C-XHM-B are supplied in Tube packaging. CAT24C16YI-GT3 and CAV24C16YE-GT3 are supplied in Tape & Reel (TR) format. Both formats are standard for surface mount components; verify your assembly process compatibility.

Q: Do all substitute parts have the same moisture sensitivity level?

A: No. AT24CS16-XHM-B and AT24C16C-XHM-B have MSL 3 (168 Hours). CAT24C16YI-GT3 and CAV24C16YE-GT3 have MSL 1 (Unlimited), indicating superior moisture resistance and less stringent storage requirements.

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