Equivalent & Substitute Parts for 25C320T/SN

Part Overview

The 25C320T/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 component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level rating. Substitute parts are identified to address packaging format variations, extended operating temperature ranges, and alternative clock frequency specifications while maintaining core memory capacity and interface compatibility.

Key Parameters

Parameter	25C320T/SN
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 25C320T/SN is determined by the following mandatory parameters: 32Kbit memory capacity, 4K x 8 memory organization, SPI interface protocol, and 8-SOIC package format. Substitute parts are grouped into three categories based on operational specifications:

Category 1: Identical Specifications with Packaging Variation Parts maintaining 3 MHz clock frequency, 4.5V ~ 5.5V supply voltage, and 0°C ~ 70°C operating temperature but offered in alternative packaging formats (Tube or Cut Tape).

Category 2: Extended Operating Temperature Range Parts with identical memory specifications and SPI interface but supporting wider temperature ranges (-40°C to 85°C or higher) and lower supply voltage minimums (1.8V or 2.5V), enabling use in industrial or automotive applications.

Category 3: Increased Clock Frequency Parts with 32Kbit capacity and SPI interface operating at higher clock frequencies (5 MHz, 10 MHz, or 20 MHz) while maintaining 8-SOIC packaging and surface mount compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Packaging Format	Product Status
25C320T/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Tape & Reel	Active
25C320/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Tube	Active
25C320T-I/SN	Microchip Technology	32Kbit	3 MHz	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tape & Reel	Active
25AA320AT-I/SN	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
25AA320T-I/SN	Microchip Technology	32Kbit	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
25LC320AT-E/SN	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Cut Tape & Digi-Reel	Active
25LC320AT-H/SN	Microchip Technology	32Kbit	5 MHz	2.5V ~ 5.5V	-40°C ~ 150°C	8-SOIC	Tape & Reel	Active
25LC320AT-I/SN	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tape & Reel	Active
25LC320T-E/SN	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Tape & Reel	Active
25LC320T-I/SN	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
AT25320B-SSHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status with ROHS3 compliance and unlimited moisture sensitivity level classification, ensuring regulatory and environmental compatibility with the 25C320T/SN baseline specification.

For applications requiring identical operational parameters with alternative packaging, 25C320/SN (Tube format) provides direct functional equivalence.

For applications requiring extended operating temperature capability, 25C320T-I/SN extends the upper temperature limit to 85°C while maintaining 3 MHz operation and 4.5V ~ 5.5V supply voltage specification.

For applications requiring lower supply voltage operation or extended temperature ranges to 125°C or 150°C, the 25LC320 series (25LC320AT-E/SN, 25LC320AT-H/SN, 25LC320AT-I/SN, 25LC320T-E/SN, 25LC320T-I/SN) provides 2.5V minimum supply voltage with clock frequencies ranging from 2 MHz to 10 MHz.

For applications requiring maximum clock frequency performance, AT25320B-SSHL-B operates at 20 MHz with 1.8V minimum supply voltage and -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can 25C320/SN replace 25C320T/SN in production assembly? A: Yes. Both parts maintain identical electrical specifications (32Kbit, 3 MHz SPI, 4.5V ~ 5.5V, 0°C ~ 70°C). The difference is packaging format: 25C320/SN uses Tube packaging while 25C320T/SN uses Tape & Reel. Verify your assembly equipment compatibility with the packaging format before substitution.

Q: What is the primary difference between 25C320T/SN and 25LC320 series parts? A: The 25C320T/SN operates at 4.5V ~ 5.5V supply voltage with 0°C ~ 70°C temperature range. The 25LC320 series supports lower supply voltages (2.5V minimum) and extended temperature ranges (-40°C to 125°C or 150°C), making them suitable for industrial and automotive applications. Clock frequencies vary across the 25LC320 lineup from 2 MHz to 10 MHz.

Q: Is AT25320B-SSHL-B compatible with 25C320T/SN applications? A: AT25320B-SSHL-B maintains 32Kbit capacity and 8-SOIC packaging but operates at 20 MHz clock frequency with 1.8V ~ 5.5V supply voltage and -40°C ~ 85°C temperature range. Substitution is valid only if your application can tolerate the higher clock frequency and lower supply voltage minimum. Verify timing requirements and power supply specifications before implementation.

Q: What packaging formats are available for 32Kbit SPI EEPROM equivalents? A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Tube formats. Select based on your assembly process requirements. Tape & Reel and Cut Tape formats are optimized for automated pick-and-place assembly, while Tube format is suitable for manual or alternative assembly methods.

Q: Can I use a higher clock frequency part as a substitute? A: Yes. Parts with higher clock frequencies (5 MHz, 10 MHz, 20 MHz) are backward compatible with applications designed for lower frequencies (1 MHz, 2 MHz, 3 MHz). The SPI interface operates at the speed commanded by the host controller, so higher-rated parts will function correctly at lower clock speeds. Verify that other electrical parameters (supply voltage, temperature range) meet your application requirements.

Q: What is the significance of the temperature range extension in 25LC320AT-H/SN? A: The 25LC320AT-H/SN supports -40°C ~ 150°C operating temperature, compared to 25C320T/SN at 0°C ~ 70°C. This extended range enables use in high-temperature industrial environments, automotive under-hood applications, and specialized equipment. Verify that your application requires this extended capability before selecting this part, as it may have different availability or lead times.

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