25LC320XT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC320XT-I/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology. This non-volatile memory device operates at 2 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and is housed in an 8-TSSOP surface mount package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level rating. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	2 MHz
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC320XT-I/ST are classified based on the following critical parameters that determine functional interchangeability:

Primary Substitution Criteria:

Memory capacity: 32Kbit (4K x 8 organization)
Interface protocol: SPI
Package type: 8-TSSOP or 8-SOIC (pin-compatible alternatives)
Supply voltage compatibility: Minimum 2.5V support required
Operating temperature range: Minimum -40°C to 85°C support
Write cycle time: 5ms or faster

Substitution Logic: Parts are grouped into two categories based on clock frequency capability. The main part operates at 2 MHz, which is the minimum specification. Substitute parts operating at 10 MHz or 20 MHz are functionally compatible as they exceed the minimum frequency requirement and maintain backward compatibility. Package variants (Tape & Reel vs. Cut Tape) do not affect electrical functionality but impact procurement and handling methods. Voltage supply ranges that encompass or exceed 2.5V to 5.5V are acceptable. Operating temperature ranges that meet or exceed -40°C to 85°C are acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package Type	Write Cycle Time	Product Status
25LC320XT-I/ST	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
25AA320AT-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
25LC320AT-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
AT25320B-XHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
CAT25320VI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	5ms	Active
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
CAV25320YE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	5ms	Active
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	4ms	Active
M95320-DWDW4TP/K	STMicroelectronics	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	8-TSSOP	4ms	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory adherence. Selection among substitute parts should be based on the following criteria derived from provided specifications:

Voltage Supply Compatibility: The 25LC320XT-I/ST requires minimum 2.5V supply. Parts with lower minimum voltage thresholds (1.7V or 1.8V) are compatible and provide additional design flexibility. Parts with matching 2.5V minimum voltage (25AA320AT-I/ST, 25LC320AT-I/ST, CAV25320YE-GT3, M95320-DWDW4TP/K) are direct voltage-compatible alternatives.

Clock Frequency: The main part operates at 2 MHz. All substitute parts operate at 10 MHz or 20 MHz, exceeding the minimum frequency requirement and maintaining backward compatibility with 2 MHz operation.

Operating Temperature Range: The main part supports -40°C to 85°C. Substitute parts offering extended temperature ranges (-40°C to 125°C or -40°C to 145°C) provide enhanced thermal performance for demanding applications. Parts matching the standard -40°C to 85°C range are direct thermal equivalents.

Package Type: The main part uses 8-TSSOP packaging. All substitute parts except CAT25320VI-GT3 use 8-TSSOP. The CAT25320VI-GT3 uses 8-SOIC packaging, which has different physical dimensions and pin layout, requiring PCB redesign for substitution.

Automotive Grade Qualification: CAV25320YE-GT3, M95320-DRDW3TP/K, and M95320-DWDW4TP/K carry AEC-Q100 automotive qualification. These parts are suitable for automotive applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC320XT-I/ST with a part operating at 10 MHz or 20 MHz?

A: Yes. The main part operates at 2 MHz. Substitute parts with higher clock frequencies (10 MHz or 20 MHz) are functionally compatible and maintain backward compatibility with 2 MHz operation. The higher frequency capability does not affect circuit operation at lower speeds.

Q: What is the difference between 8-TSSOP and 8-SOIC packages?

A: Both are 8-pin surface mount packages but have different physical dimensions and pin spacing. 8-TSSOP measures 0.173" width (4.40mm), while 8-SOIC measures 0.154" width (3.90mm). Direct substitution between these packages requires PCB layout modification. The CAT25320VI-GT3 uses 8-SOIC packaging and cannot be directly substituted without redesign.

Q: Are parts with lower minimum voltage ratings (1.7V or 1.8V) compatible with my 2.5V supply?

A: Yes. Parts with minimum voltage ratings of 1.7V or 1.8V are fully compatible with a 2.5V supply, as 2.5V exceeds their minimum threshold. These parts provide additional design flexibility for lower-voltage applications.

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. Parts with this qualification (CAV25320YE-GT3, M95320-DRDW3TP/K, M95320-DWDW4TP/K) are suitable for automotive applications. Non-qualified parts are suitable for industrial and consumer applications.

Q: Can I use a substitute part with a faster write cycle time (4ms vs. 5ms)?

A: Yes. Parts with faster write cycle times (4ms) are compatible with applications designed for 5ms write cycles. The faster performance provides improved data write speed without affecting circuit functionality.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel and Cut Tape are packaging and delivery formats that do not affect electrical functionality. Tape & Reel is supplied on continuous tape for automated assembly. Cut Tape is supplied in individual tape segments. Selection depends on procurement volume and assembly equipment compatibility.

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