24LC32AF-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC32AF-E/ST is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. 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 product status with 1000 units in stock. Equivalent and substitute parts are identified based on matching core electrical parameters: 32Kbit memory capacity, I2C interface protocol, 4K x 8 memory organization, 8-TSSOP package, and compatible voltage/temperature specifications.

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 24LC32AF-E/ST are classified based on electrical and mechanical compatibility within the following criteria:

Core Matching Parameters (Required for Direct Substitution):

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

Allowed Parameter Variations:

Clock Frequency: 400 kHz or higher (1 MHz acceptable)
Access Time: 900 ns or faster (400 ns, 450 ns acceptable)
Write Cycle Time: 5ms or faster (4ms acceptable)
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V minimum requirement
Operating Temperature: Must support -40°C minimum; upper limit may vary (85°C or 125°C)

Substitution Categories:

Parametric Equivalent: 24LC32A-E/ST (Microchip Technology) — Identical electrical specifications and temperature range; differs only in packaging format (Tube vs. original specification).

MFR Recommended Substitutes: CAT24C32YI-GT3, CAV24C32YE-GT3, M24C32-DRDW3TP/K, R1EX24032ATAS0I#S0 — All meet core memory and package requirements with enhanced performance characteristics (higher clock frequency, faster access time) or automotive-grade qualifications.

Parameter Comparison

Parameter	24LC32AF-E/ST	24LC32A-E/ST	CAT24C32YI-GT3	CAV24C32YE-GT3	M24C32-DRDW3TP/K	R1EX24032ATAS0I#S0
Manufacturer	Microchip	Microchip	onsemi	onsemi	STMicroelectronics	Renesas
Memory Size	32Kbit	32Kbit	32Kbit	32Kbit	32Kbit	32Kbit
Memory Organization	4K x 8	4K x 8	4K x 8	4K x 8	4K x 8	4K x 8
I2C Clock Frequency	400 kHz	400 kHz	1 MHz	400 kHz	1 MHz	400 kHz
Access Time	900 ns	900 ns	400 ns	900 ns	450 ns	900 ns
Write Cycle Time	5ms	5ms	5ms	5ms	4ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Packaging Format	Tube	Tube	Tape & Reel	Tape & Reel	Cut Tape & Digi-Reel	Tape & Reel
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	No	AEC-Q100	AEC-Q100	No

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): 24LC32A-E/ST is a parametric equivalent with identical electrical performance and temperature range. Selection between 24LC32AF-E/ST and 24LC32A-E/ST depends on packaging format requirements (Tube vs. alternative formats) and inventory availability.

Enhanced Performance Substitutes (Higher Clock Frequency): CAT24C32YI-GT3 and M24C32-DRDW3TP/K offer 1 MHz I2C clock frequency with faster access times (400 ns and 450 ns respectively). These are suitable for applications requiring higher data throughput. CAT24C32YI-GT3 operates to 85°C maximum; M24C32-DRDW3TP/K extends to 125°C and includes AEC-Q100 automotive qualification.

Automotive-Grade Alternatives: CAV24C32YE-GT3 and M24C32-DRDW3TP/K both carry AEC-Q100 qualification for automotive applications. CAV24C32YE-GT3 maintains 400 kHz operation with 125°C temperature rating. M24C32-DRDW3TP/K provides 1 MHz operation with 125°C rating and 4ms write cycle time.

Temperature-Constrained Applications: CAT24C32YI-GT3 and R1EX24032ATAS0I#S0 are limited to -40°C ~ 85°C operating range. These are suitable only for applications not requiring 125°C upper temperature operation.

Voltage Supply Flexibility: CAT24C32YI-GT3, M24C32-DRDW3TP/K, and R1EX24032ATAS0I#S0 support lower minimum supply voltages (1.7V, 1.8V, 1.8V respectively) compared to the 2.5V minimum of 24LC32AF-E/ST, enabling operation in low-power applications.

All substitute parts maintain ROHS3 compliance, identical memory capacity and organization, I2C interface protocol, and 8-TSSOP package footprint.

Frequently Asked Questions (FAQ)

Q: Can CAT24C32YI-GT3 replace 24LC32AF-E/ST in all applications? A: CAT24C32YI-GT3 is electrically compatible for core memory functions but operates only to 85°C maximum temperature. Applications requiring sustained operation above 85°C require 24LC32AF-E/ST, 24LC32A-E/ST, CAV24C32YE-GT3, or M24C32-DRDW3TP/K.

Q: What is the advantage of 1 MHz clock frequency in CAT24C32YI-GT3 and M24C32-DRDW3TP/K? A: 1 MHz I2C clock frequency enables faster data transfer rates compared to the 400 kHz standard. This reduces read/write cycle times for applications requiring high-speed memory access. Both devices maintain backward compatibility with 400 kHz I2C bus operation.

Q: Are automotive-grade parts (CAV24C32YE-GT3, M24C32-DRDW3TP/K) required for non-automotive applications? A: Automotive-grade qualification (AEC-Q100) is not required for non-automotive applications. Standard industrial-grade parts (24LC32AF-E/ST, 24LC32A-E/ST, CAT24C32YI-GT3, R1EX24032ATAS0I#S0) are suitable for consumer and industrial use. Automotive-grade parts may be selected for enhanced reliability specifications if application requirements justify the cost.

Q: Does packaging format (Tube, Tape & Reel, Cut Tape) affect electrical performance? A: Packaging format does not affect electrical performance or functionality. Format selection depends on manufacturing process requirements: Tube packaging for manual assembly or small-volume production; Tape & Reel or Cut Tape for automated pick-and-place assembly. All formats contain identical die and electrical specifications.

Q: Can R1EX24032ATAS0I#S0 operate at 125°C? A: R1EX24032ATAS0I#S0 is rated for -40°C ~ 85°C maximum operating temperature. Applications requiring 125°C operation require 24LC32AF-E/ST, 24LC32A-E/ST, CAV24C32YE-GT3, or M24C32-DRDW3TP/K.

Q: What is the minimum supply voltage requirement for each part? A: 24LC32AF-E/ST and 24LC32A-E/ST require 2.5V minimum. CAT24C32YI-GT3 operates from 1.7V minimum. M24C32-DRDW3TP/K and R1EX24032ATAS0I#S0 operate from 1.8V minimum. All support 5.5V maximum supply voltage.

Q: Are all substitute parts pin-compatible with 24LC32AF-E/ST? A: All substitute parts use identical 8-TSSOP package with matching pinout. Direct PCB footprint compatibility is confirmed across all listed alternatives.

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