Microchip 25C320/SN EEPROM 32Kbit SPI Memory IC Equivalent & Substitute Parts

Part Overview

The Microchip 25C320/SN is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC in 8-SOIC surface mount packaging. This non-volatile memory device operates at 3 MHz clock frequency with a 5ms write cycle time and is designed for applications requiring persistent data storage in embedded systems. The part is Active status and ROHS3 compliant. Substitute parts are necessary when the original part is unavailable, when extended temperature range operation is required, or when higher clock frequency performance is needed for system optimization.

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	0°C ~ 70°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/SN is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 32Kbit (mandatory match)
Memory Organization: 4K x 8 (mandatory match)
Memory Interface: SPI (mandatory match)
Package / Case: 8-SOIC form factor (mandatory match)
Write Cycle Time: 5ms (mandatory match)

Performance Parameters (Substitution Allowed):

Clock Frequency: Equal to or greater than 3 MHz
Voltage Supply Range: Must encompass or exceed 4.5V ~ 5.5V
Operating Temperature: May extend beyond 0°C ~ 70°C range

Manufacturer Flexibility:

Microchip Technology parts within the same memory family (25AA, 25LC, 25C series) are substitutable when core parameters match
Alternative manufacturers (Rohm Semiconductor) are substitutable when all core parameters and electrical specifications align

Substitute parts identified in this reference meet all mandatory core compatibility requirements and maintain functional equivalence with the 25C320/SN.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Inventory Status
25C320/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	2098 Pcs
25C320-I/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1721 Pcs
25LC320/SN	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	3257 Pcs
25LC320-I/SN	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	18386 Pcs
25LC320A-I/SN	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	22482 Pcs
25LC320A-E/SN	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	5705 Pcs
25AA320-I/SN	Microchip Technology	32Kbit	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1773 Pcs
25AA320A-I/SN	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	5000 Pcs
AT25320B-SSHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	4300 Pcs
AT25320B-SSHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	43780 Pcs
BR25S320FJ-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	962 Pcs

Engineering Selection Recommendations

Direct Substitutes (Same Operating Temperature Range):

25LC320/SN: Operates at 2 MHz with extended voltage range (2.5V ~ 5.5V). Suitable for systems where lower clock frequency is acceptable and lower supply voltage operation is beneficial. Active status, ROHS3 compliant, DiGi-Electronics Programmable verified.

Extended Temperature Range Substitutes:

25C320-I/SN: Identical 3 MHz performance with extended operating range (-40°C ~ 85°C). Recommended for industrial and automotive applications requiring wider temperature operation. Active status, ROHS3 compliant, DiGi-Electronics Programmable verified.
25LC320-I/SN: 2 MHz operation with extended temperature range (-40°C ~ 85°C) and lower supply voltage support (2.5V ~ 5.5V). Active status, ROHS3 compliant, DiGi-Electronics Programmable verified.
25LC320A-E/SN: 10 MHz performance with extended temperature range (-40°C ~ 125°C). Suitable for high-temperature applications requiring enhanced clock frequency. Active status, ROHS3 compliant, DiGi-Electronics Programmable verified.

Higher Performance Substitutes:

25LC320A-I/SN: 10 MHz clock frequency with extended temperature range (-40°C ~ 85°C) and lower supply voltage (2.5V ~ 5.5V). Provides performance headroom for timing-critical applications. Active status, ROHS3 compliant, DiGi-Electronics Programmable verified. High inventory availability (22482 Pcs).
25AA320A-I/SN: 10 MHz performance with lowest supply voltage requirement (1.8V ~ 5.5V) and extended temperature range (-40°C ~ 85°C). Suitable for low-power and battery-operated systems. Active status, ROHS3 compliant. Note: DiGi-Electronics Programmable status not verified.
AT25320B-SSHL-B and AT25320B-SSHL-T: 20 MHz clock frequency with wide voltage range (1.8V ~ 5.5V) and extended temperature range (-40°C ~ 85°C). Highest performance option for demanding applications. Active status, ROHS3 compliant, DiGi-Electronics Programmable verified. AT25320B-SSHL-T offers significantly higher inventory (43780 Pcs).

Alternative Manufacturer:

BR25S320FJ-WE2 (Rohm Semiconductor): 20 MHz performance with voltage range 1.7V ~ 5.5V and extended temperature range (-40°C ~ 85°C). Functionally equivalent to AT25320B series. Active status, ROHS3 compliant. Note: DiGi-Electronics Programmable status not verified. Lower inventory availability (962 Pcs).

Selection Criteria:

For cost-optimized designs with standard temperature requirements: 25LC320/SN
For industrial temperature range with same performance: 25C320-I/SN
For performance-enhanced designs: 25LC320A-I/SN or 25AA320A-I/SN
For maximum performance and extended temperature: AT25320B-SSHL-T
For low-voltage applications: 25AA320A-I/SN or AT25320B series

Frequently Asked Questions (FAQ)

Q: Can I use 25LC320A-I/SN as a direct replacement for 25C320/SN? A: Yes. Both devices share identical 32Kbit memory size, 4K x 8 organization, SPI interface, 8-SOIC package, and 5ms write cycle time. The 25LC320A-I/SN operates at 10 MHz (higher than the 3 MHz of 25C320/SN) and supports extended temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). The lower supply voltage requirement (2.5V ~ 5.5V) is compatible with systems designed for 4.5V ~ 5.5V operation.

Q: What is the difference between 25LC320-I/SN and 25LC320/SN? A: Both operate at 2 MHz with identical memory specifications and 8-SOIC packaging. The primary difference is operating temperature: 25LC320-I/SN supports -40°C ~ 85°C (industrial range), while 25LC320/SN supports 0°C ~ 70°C (commercial range). The -I/SN variant is suitable for extended temperature applications.

Q: Why would I choose AT25320B-SSHL-T over 25LC320A-I/SN? A: AT25320B-SSHL-T operates at 20 MHz versus 10 MHz for 25LC320A-I/SN, providing double the clock frequency for timing-critical applications. Both support identical memory size, organization, interface, and package. AT25320B-SSHL-T also offers significantly higher inventory availability (43780 Pcs versus 22482 Pcs). The trade-off is that AT25320B-SSHL-T uses a different base product number (AT25320 versus 25LC320), though both are Microchip Technology products.

Q: Is BR25S320FJ-WE2 from Rohm Semiconductor compatible with Microchip parts? A: Yes. BR25S320FJ-WE2 meets all core compatibility requirements: 32Kbit memory, 4K x 8 organization, SPI interface, 8-SOIC package, and 5ms write cycle time. It operates at 20 MHz with voltage range 1.7V ~ 5.5V and temperature range -40°C ~ 85°C. The primary consideration is that DiGi-Electronics Programmable verification status is not confirmed for this part.

Q: Can I use 25AA320-I/SN in a 5V system? A: Yes. The 25AA320-I/SN supports voltage range 1.8V ~ 5.5V, which encompasses standard 5V operation. However, it operates at only 1 MHz clock frequency, which is lower than the 3 MHz of 25C320/SN. This part is suitable for applications where lower clock speed is acceptable and extended temperature range (-40°C ~ 85°C) is required.

Q: What packaging options are available for these substitute parts? A: All substitute parts listed use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, matching the 25C320/SN package specification. Packaging format variations (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical or mechanical compatibility; they reflect distribution and handling preferences.

Q: Are all these parts ROHS3 compliant? A: Yes. All substitute parts listed in this reference are ROHS3 compliant, matching the compliance status of the 25C320/SN.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message