24LC32AFT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC32AFT-E/ST is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The device is ROHS3 compliant and currently in active production status with 880 units in stock. Equivalent and substitute parts are identified for applications requiring alternative sourcing, extended availability, or specific performance characteristics within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K 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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC32AFT-E/ST are grouped based on strict electrical and mechanical compatibility within the following criteria:

Core Compatibility Requirements:

Memory capacity: 32Kbit
Memory organization: 4K x 8
Interface protocol: I2C
Package type: 8-TSSOP with 0.173" width and 4.40mm dimensions
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1 (Unlimited)

Performance Parameter Ranges:

I2C clock frequency: 400 kHz minimum (higher frequencies acceptable)
Access time: 900 ns maximum (lower values acceptable)
Write cycle time: 5ms maximum (lower values acceptable)
Supply voltage: Minimum 2.5V required; maximum 5.5V acceptable
Operating temperature: Minimum -40°C required; maximum 125°C acceptable

Substitute parts are classified as MFR Recommended or Parametric Equivalent based on adherence to these specifications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Automotive Grade
24LC32AFT-E/ST	Microchip Technology	32Kbit	400 kHz	900 ns	5ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	No
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	No
M24C32-DRDW3TP/K	STMicroelectronics	32Kbit	1 MHz	450 ns	4ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Yes (AEC-Q100)
M24C32-DRDW8TP/K	STMicroelectronics	32Kbit	1 MHz	450 ns	4ms	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Yes (AEC-Q100)
R1EX24032ATAS0I#S0	Renesas Electronics Corporation	32Kbit	400 kHz	900 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	No
CAV24C32YE-GT3	onsemi	32Kbit	400 kHz	900 ns	5ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Yes (AEC-Q100)

Engineering Selection Recommendations

CAT24C32YI-GT3 (onsemi): MFR Recommended substitute offering enhanced I2C clock frequency at 1 MHz with improved 400 ns access time. Operates across 1.7V to 5.5V supply range. Operating temperature range extends to -40°C but maximum is limited to 85°C. Suitable for applications not requiring the full 125°C upper temperature limit of the original part.

M24C32-DRDW3TP/K (STMicroelectronics): MFR Recommended substitute with automotive-grade qualification (AEC-Q100) and 1 MHz I2C clock frequency. Maintains full -40°C to 125°C operating temperature range. Write cycle time reduced to 4ms. Supply voltage minimum of 1.8V. Appropriate for automotive and industrial applications requiring AEC-Q100 certification.

M24C32-DRDW8TP/K (STMicroelectronics): MFR Recommended substitute with automotive-grade qualification (AEC-Q100) and 1 MHz I2C clock frequency. Operating temperature range limited to -40°C to 105°C. Write cycle time reduced to 4ms. Supply voltage minimum of 1.8V. Suitable for automotive applications with temperature requirements up to 105°C.

R1EX24032ATAS0I#S0 (Renesas Electronics Corporation): MFR Recommended substitute maintaining identical 400 kHz I2C clock frequency and 900 ns access time specifications. Supply voltage range 1.8V to 5.5V. Operating temperature range -40°C to 85°C. Electrical performance matches original part with extended lower supply voltage support.

CAV24C32YE-GT3 (onsemi): Parametric Equivalent with automotive-grade qualification (AEC-Q100). Maintains 400 kHz I2C clock frequency, 900 ns access time, and 5ms write cycle time. Supply voltage 2.5V to 5.5V and operating temperature -40°C to 125°C match original specifications exactly. Recommended for automotive applications requiring identical electrical performance with AEC-Q100 certification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher I2C clock frequency than the original 24LC32AFT-E/ST?

A: Yes. Substitute parts operating at 1 MHz I2C clock frequency (CAT24C32YI-GT3, M24C32-DRDW3TP/K, M24C32-DRDW8TP/K) are backward compatible with 400 kHz I2C bus systems. The I2C protocol allows devices to operate at lower clock frequencies than their maximum rated speed.

Q: What is the difference between MFR Recommended and Parametric Equivalent classifications?

A: MFR Recommended substitutes are approved by manufacturers as direct replacements. Parametric Equivalent parts meet all electrical and mechanical specifications but may have additional certifications or qualifications. CAV24C32YE-GT3 is classified as Parametric Equivalent due to its automotive-grade AEC-Q100 qualification while maintaining identical core electrical parameters.

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

A: Yes. All listed substitute parts use the 8-TSSOP package with 0.173" width and 4.40mm dimensions, ensuring mechanical compatibility and identical PCB footprints.

Q: Which substitute part should I select for automotive applications?

A: Three parts carry automotive-grade qualification (AEC-Q100): M24C32-DRDW3TP/K, M24C32-DRDW8TP/K, and CAV24C32YE-GT3. Select based on required operating temperature range: M24C32-DRDW3TP/K for -40°C to 125°C, M24C32-DRDW8TP/K for -40°C to 105°C, or CAV24C32YE-GT3 for -40°C to 125°C with identical electrical specifications to the original part.

Q: What is the minimum supply voltage requirement for each substitute?

A: Original 24LC32AFT-E/ST requires 2.5V minimum. Substitutes offer lower minimums: CAT24C32YI-GT3 at 1.7V, M24C32-DRDW3TP/K and M24C32-DRDW8TP/K at 1.8V, R1EX24032ATAS0I#S0 at 1.8V, and CAV24C32YE-GT3 at 2.5V. All support 5.5V maximum.

Q: Can I use a substitute with a lower maximum operating temperature?

A: Substitutes with maximum operating temperature of 85°C (CAT24C32YI-GT3, R1EX24032ATAS0I#S0) are suitable only for applications not requiring operation above 85°C. For applications requiring the full -40°C to 125°C range, select M24C32-DRDW3TP/K, CAV24C32YE-GT3, or the original 24LC32AFT-E/ST.

Q: What are the inventory levels for each substitute part?

A: Current stock levels are: CAT24C32YI-GT3 (16,931 units), M24C32-DRDW3TP/K (1,455 units), M24C32-DRDW8TP/K (3,200 units), R1EX24032ATAS0I#S0 (4,139 units), and CAV24C32YE-GT3 (6,807 units).

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