AT24CS32-XHM-T Equivalent & Substitute Parts

Part Overview

The AT24CS32-XHM-T is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. This device is housed in an 8-TSSOP surface mount package and operates across a supply voltage range of 1.7V to 5.5V with an operating temperature range of -40°C to 85°C. The part is currently active in production status with ROHS3 compliance and is suitable for applications requiring non-volatile serial memory storage. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in target applications.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K 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
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT24CS32-XHM-T are classified based on the following substitution criteria:

Primary Substitution Criteria (Mandatory Match):

Memory Size: 32Kbit
Memory Organization: 4K x 8
Memory Interface: I2C
Package Type: 8-TSSOP
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters (Allowable Variation):

Clock Frequency: 400 kHz to 1 MHz (lower frequencies are backward compatible)
Access Time: 400 ns to 900 ns (slower access times do not affect functionality)
Voltage Supply Range: Minimum 1.6V to 1.8V; Maximum 5.5V (overlapping ranges acceptable)
Operating Temperature: -40°C to 85°C or extended ranges (standard range acceptable)
Write Cycle Time: 4ms to 5ms (minor variations acceptable)
Moisture Sensitivity Level: 1 to 3 (affects handling but not electrical function)

Parts meeting all primary criteria and falling within secondary parameter tolerances are considered functionally equivalent for direct substitution in the AT24CS32-XHM-T application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time (ns)	Voltage Supply	Operating Temp	Package	MSL	Product Status
AT24CS32-XHM-T	Microchip Technology	32Kbit	1 MHz	550	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	3	Active
AT24C32D-XHM-T	Microchip Technology	32Kbit	1 MHz	550	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	3	Active
24AA32AT-I/ST	Microchip Technology	32Kbit	400 kHz	900	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	N/A	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1	Active
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	N/A	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1	Active
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
M24C32-DFDW6TP	STMicroelectronics	32Kbit	1 MHz	450	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
M24C32-DRDW3TP/K	STMicroelectronics	32Kbit	1 MHz	450	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1	Active
M24C32-FDW6TP	STMicroelectronics	32Kbit	1 MHz	450	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
M24C32-RDW6TP	STMicroelectronics	32Kbit	1 MHz	450	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
M24C32-XDW5TP	STMicroelectronics	32Kbit	1 MHz	450	1.6V ~ 5.5V	-20°C ~ 85°C	8-TSSOP	1	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and ROHS3 compliance, meeting regulatory requirements equivalent to the AT24CS32-XHM-T. Selection among substitutes should be based on the following engineering considerations:

Direct Parametric Equivalents: AT24C32D-XHM-T provides identical electrical and thermal specifications with matching 1 MHz clock frequency and 550 ns access time, differing only in packaging designation.

Microchip Technology Alternatives: The 24AA32AT-I/ST operates at reduced clock frequency (400 kHz) with slower access time (900 ns) but maintains full I2C compatibility and offers improved moisture sensitivity rating (MSL 1). This part is suitable for applications where maximum clock speed is not required.

Rohm Semiconductor Options: BR24G32FVT-3AGE2 matches 1 MHz operation with superior moisture sensitivity (MSL 1) and uses 8-TSSOP-B package variant. BR24G32FVT-3GE2 operates at 400 kHz with extended voltage range (1.6V minimum) and MSL 1 rating.

STMicroelectronics Series: M24C32 variants (DFDW6TP, DRDW3TP/K, FDW6TP, RDW6TP, XDW5TP) all operate at 1 MHz with 450 ns access time and MSL 1 rating. M24C32-DRDW3TP/K includes automotive qualification (AEC-Q100) and extended operating temperature to 125°C, suitable for automotive applications. M24C32-XDW5TP supports extended voltage range (1.6V minimum) and reduced operating temperature floor (-20°C).

onsemi Alternative: CAT24C32YI-GT3 matches 1 MHz operation with superior access time (400 ns) and MSL 1 rating, offering performance enhancement over the primary part.

Frequently Asked Questions (FAQ)

Q: Can I substitute the AT24CS32-XHM-T with a 400 kHz I2C EEPROM?

A: Yes, provided all other parameters match. Parts such as 24AA32AT-I/ST and BR24G32FVT-3GE2 operate at 400 kHz and are functionally compatible. Lower clock frequency does not prevent operation in 1 MHz-capable systems; the device will simply operate at its rated maximum speed. Verify application timing requirements do not mandate 1 MHz operation.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both packages are 8-pin thin shrink small outline packages with identical pin pitch (0.65mm) and body width (4.40mm). The -B designation indicates a variant from Rohm Semiconductor. Pin configuration and electrical function remain identical; physical compatibility is maintained for PCB layout purposes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental and regulatory status of the AT24CS32-XHM-T.

Q: Which substitute offers the fastest access time?

A: The CAT24C32YI-GT3 from onsemi provides 400 ns access time, the fastest among listed substitutes. The AT24CS32-XHM-T and AT24C32D-XHM-T specify 550 ns access time.

Q: Can I use M24C32-DRDW3TP/K in non-automotive applications?

A: Yes. Automotive-qualified parts (AEC-Q100) exceed standard reliability requirements and are suitable for general industrial and commercial applications. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin.

Q: What does Moisture Sensitivity Level (MSL) indicate?

A: MSL rating specifies the maximum time a component can be exposed to moisture at specified temperature and humidity before soldering. MSL 1 (unlimited) indicates no time restriction. MSL 3 (168 hours) requires component storage in dry conditions and limits floor life after moisture exposure. Parts with MSL 1 offer superior handling flexibility.

Q: Are there voltage supply differences I should consider?

A: Most substitutes operate within 1.7V to 5.5V, matching the primary part. M24C32-XDW5TP and BR24G32FVT-3GE2 extend the minimum voltage to 1.6V, providing compatibility with lower-voltage systems. M24C32-DRDW3TP/K and M24C32-RDW6TP specify 1.8V minimum, which is acceptable for 1.7V-rated applications with adequate supply margin.

Q: Which substitute is recommended for cost optimization?

A: Inventory availability and pricing are not specified in this engineering reference. Consult component distributors for current pricing and stock levels. From a technical standpoint, 24AA32AT-I/ST and BR24G32FVT-3GE2 offer reduced clock frequency operation at lower typical cost, suitable for applications not requiring 1 MHz performance.

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