FT25C32A-USR-T EEPROM 32Kbit SPI Memory IC Equivalent & Substitute Parts

Part Overview

The FT25C32A-USR-T is a 32Kbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, featuring SPI interface operation at 20 MHz with supply voltage range of 1.8V to 5.5V. This device is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same memory capacity, interface protocol, and package form factor.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	20 MHz
Voltage Supply Range	1.8V ~ 5.5V
Write Cycle Time	5ms
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FT25C32A-USR-T is determined by the following criteria:

Primary Compatibility Requirements:

Memory Size: 32Kbit (4K x 8 organization)
Memory Interface: SPI protocol
Package / Case: 8-SOIC form factor with 0.154" width (3.90mm)
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -40°C to 85°C coverage
Voltage Supply: Minimum 1.8V to 5.5V compatibility

Secondary Compatibility Factors:

Clock Frequency: 20 MHz operation capability
Write Cycle Time: 5ms or faster
RoHS3 Compliance status
Product Status: Active classification

Substitute parts are grouped based on clock frequency performance tiers while maintaining all primary compatibility requirements. Parts operating at lower clock frequencies (1 MHz, 3 MHz, 10 MHz) remain functionally compatible in applications not requiring maximum speed performance.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Write Cycle Time	Operating Temp	Package	RoHS Status	Product Status
FT25C32A-USR-T	Fremont Micro Devices Ltd	32Kbit	20 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
25AA320-I/SN	Microchip Technology	32Kbit	1 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
25AA320A-I/SN	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
25AA320AT-I/SN	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
25AA320T-I/SN	Microchip Technology	32Kbit	1 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
25C320T-I/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
AT25320B-SSHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
BR25S320FJ-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
CAT25320VI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
M95320-DFMN6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	5ms	-40°C ~ 85°C	8-SOIC	ROHS3	Active
M95320-DRMN3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	4ms	-40°C ~ 125°C	8-SOIC	ROHS3	Active

Engineering Selection Recommendations

Direct Equivalents (20 MHz Operation): AT25320B-SSHL-T, BR25S320FJ-WE2, and M95320-DFMN6TP are direct functional equivalents to FT25C32A-USR-T, all operating at 20 MHz with identical memory organization and SPI interface. All three maintain RoHS3 compliance and Active product status. AT25320B-SSHL-T offers the highest inventory availability at 43,780 units. M95320-DRMN3TP/K provides extended operating temperature range to 125°C with automotive AEC-Q100 qualification, suitable for temperature-critical applications.

Reduced Clock Frequency Alternatives: 25AA320A-I/SN and 25AA320AT-I/SN operate at 10 MHz, suitable for applications where maximum clock speed is not required. CAT25320VI-GT3 also operates at 10 MHz with 25,634 units in stock. 25AA320-I/SN and 25AA320T-I/SN operate at 1 MHz. 25C320T-I/SN operates at 3 MHz but has restricted voltage supply range (4.5V ~ 5.5V), limiting compatibility with lower voltage applications.

Compliance and Availability: All listed substitute parts maintain ROHS3 compliance and Active product status. Inventory levels vary significantly, with AT25320B-SSHL-T providing maximum availability. Selection should prioritize clock frequency requirements and voltage supply compatibility for the target application.

Frequently Asked Questions (FAQ)

Q: Can I use a 10 MHz part as a substitute for the 20 MHz FT25C32A-USR-T? A: Yes, if your application does not require 20 MHz operation. Parts such as 25AA320A-I/SN, 25AA320AT-I/SN, and CAT25320VI-GT3 are electrically and mechanically compatible. Clock frequency is a performance specification; lower-speed parts operate correctly in circuits designed for higher speeds.

Q: What is the difference between the 25AA320 and 25C320 series? A: The primary difference is voltage supply range. 25AA320 series supports 1.8V ~ 5.5V operation, while 25C320T-I/SN is limited to 4.5V ~ 5.5V. Select based on your circuit's minimum supply voltage requirement.

Q: Are all substitute parts in the same 8-SOIC package? A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package form factor, ensuring mechanical compatibility with the original FT25C32A-USR-T footprint.

Q: What does RoHS3 compliance mean for substitution? A: All listed parts are RoHS3 compliant, meeting the same environmental and material restriction standards. This ensures regulatory compatibility across all substitute options.

Q: Can I use M95320-DRMN3TP/K in a standard -40°C to 85°C application? A: Yes. M95320-DRMN3TP/K operates across -40°C to 125°C, which includes the standard -40°C to 85°C range. The extended temperature capability does not restrict use in standard temperature applications.

Q: What is the difference between packaging types (Tape & Reel vs. Cut Tape)? A: Packaging type affects supply format and handling but does not impact electrical or mechanical compatibility. Tape & Reel (TR) is suitable for high-volume automated assembly, while Cut Tape (CT) & Digi-Reel® is appropriate for lower-volume or mixed-component orders.

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