Equivalent & Substitute Parts for 25C320-E/SN

Part Overview

The 25C320-E/SN is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-SOIC surface mount packaging. This device is classified as Active product status and is RoHS3 compliant. Substitute parts are necessary when addressing supply constraints, performance requirements exceeding 3 MHz operation, extended temperature ranges, or automotive-grade qualification needs.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	3 MHz
Write Cycle Time	5ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°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 25C320-E/SN is determined by the following criteria:

Critical Parameters (Must Match):

Memory Size: 32Kbit
Memory Organization: 4K x 8
Memory Interface: SPI
Package / Case: 8-SOIC form factor (0.154" width or compatible 8-SOP variants)
Mounting Type: Surface Mount

Flexible Parameters (May Exceed Original Specification):

Clock Frequency: Substitute parts may operate at 10 MHz or 20 MHz (higher performance acceptable)
Voltage Supply Range: Substitute parts may support lower minimum voltages (1.7V, 1.8V, 2.5V) while maintaining 5.5V maximum
Operating Temperature: Substitute parts may support extended ranges (-40°C ~ 125°C) or automotive grades with AEC-Q100 qualification
Write Cycle Time: Substitute parts may have equal or faster write cycles (4ms or 5ms)

Substitute parts from Microchip Technology, STMicroelectronics, Rohm Semiconductor, and onsemi meet these criteria with enhanced performance characteristics or automotive qualification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Write Cycle	Package	Automotive Grade
25C320-E/SN	Microchip	32Kbit	3 MHz	4.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-SOIC	No
25LC320A-E/SN	Microchip	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-SOIC	No
AT25320B-SSHL-B	Microchip	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	No
AT25320B-SSHL-T	Microchip	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	No
BR25S320F-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOP	No
CAT25320VI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	No
CAV25320VE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-SOIC	Yes (AEC-Q100)
M95320-DFMN6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	No
M95320-DRMN3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-SOIC	Yes (AEC-Q100)
M95320-DRMN8TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 105°C	4ms	8-SO	Yes (AEC-Q100)
M95320-RMN6TP	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	No

Engineering Selection Recommendations

For Standard Industrial Applications: Select 25LC320A-E/SN or CAT25320VI-GT3 when higher clock frequency (10 MHz) is required without automotive qualification. Both maintain the extended temperature range of the original part and offer improved performance headroom.

For High-Speed SPI Requirements: Select AT25320B-SSHL-T or M95320-DRMN8TP/K when 20 MHz operation is necessary. AT25320B-SSHL-T provides high inventory availability in cut tape format. M95320-DRMN8TP/K offers automotive AEC-Q100 qualification with extended temperature operation to 105°C.

For Automotive and Extended Temperature Applications: Select CAV25320VE-GT3 or M95320-DRMN3TP/K. Both carry AEC-Q100 automotive qualification and support the full -40°C ~ 125°C temperature range. M95320-DRMN3TP/K provides 20 MHz operation with 4ms write cycle time.

For Low-Voltage Supply Designs: Select BR25S320F-WE2 (1.7V minimum) or M95320-DFMN6TP (1.7V minimum) when supply voltage drops below 2.5V. Both support 20 MHz operation.

For Package Compatibility: All substitute parts maintain 8-SOIC or compatible 8-SOP form factor with 0.154" to 0.173" width. BR25S320F-WE2 uses 8-SOP (0.173" width) and may require PCB layout verification for pin-to-pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz substitute part in place of the 3 MHz 25C320-E/SN?

A: Yes. Higher clock frequency operation is backward compatible. The 25C320-E/SN will function correctly with substitute parts rated for 10 MHz or 20 MHz, as the system clock can be configured to operate at or below the original 3 MHz specification.

Q: What is the difference between AT25320B-SSHL-B and AT25320B-SSHL-T?

A: Both parts are identical in electrical specifications (32Kbit, 20 MHz, 8-SOIC). The difference is packaging format: -B indicates Tube packaging, while -T indicates Cut Tape (CT) & Digi-Reel format. AT25320B-SSHL-T has significantly higher inventory availability (43,780 pcs vs. 4,300 pcs).

Q: Are automotive-grade parts (AEC-Q100) required for my application?

A: Automotive qualification is required only for automotive, industrial, or mission-critical applications subject to AEC-Q100 standards. For standard consumer or industrial electronics, non-automotive parts are acceptable. CAV25320VE-GT3 and M95320-DRMN3TP/K provide automotive qualification if needed.

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

A: The original 25C320-E/SN requires 4.5V minimum. Substitute parts support lower minimums: 25LC320A-E/SN and CAV25320VE-GT3 require 2.5V; AT25320B-SSHL series, CAT25320VI-GT3, M95320 series require 1.8V; BR25S320F-WE2 requires 1.7V. Verify your power supply design supports the selected part's minimum voltage.

Q: Is the 8-SOP package (BR25S320F-WE2) pin-compatible with 8-SOIC?

A: Both are 8-pin surface mount packages with similar pinouts, but physical dimensions differ slightly (8-SOP is 0.173" width vs. 8-SOIC at 0.154" width). PCB footprint verification is required before substitution to ensure proper solder joint formation and thermal performance.

Q: What is the write cycle time difference between 5ms and 4ms?

A: Write cycle time is the duration required to complete a single page write operation. M95320-DRMN3TP/K and M95320-DRMN8TP/K offer 4ms cycles versus 5ms for other parts. This provides 20% faster write performance and is fully compatible with systems designed for 5ms operation.

Q: Can I substitute parts with different operating temperature ranges?

A: Yes, if your application operates within the substitute part's temperature range. The original 25C320-E/SN supports -40°C ~ 125°C. Substitute parts with narrower ranges (-40°C ~ 85°C) are acceptable for applications not requiring the full temperature span. Parts with extended ranges (-40°C ~ 125°C) provide additional margin.

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