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25LC320AXT-E/ST EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 25LC320AXT-E/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in an 8-TSSOP surface mount package. This non-volatile memory device operates at 10 MHz clock frequency with a 5ms write cycle time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The device is ROHS3 compliant and currently in active product status with 1062 units in stock. 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.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 32Kbit |
| Memory Organization | 4K x 8 |
| Memory Interface | SPI |
| Clock Frequency | 10 MHz |
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Voltage - Supply | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Write Cycle Time | 5ms |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 25LC320AXT-E/ST is determined by the following critical parameters:
Primary Matching Criteria:
- Memory capacity: 32Kbit
- Memory organization: 4K x 8
- Interface protocol: SPI
- Package type: 8-TSSOP with 0.173" width and 4.40mm width dimensions
- Mounting type: Surface Mount
Secondary Compatibility Factors:
- Clock frequency: 10 MHz or higher (higher frequency parts are backward compatible)
- Supply voltage range: Must encompass or exceed 2.5V ~ 5.5V
- Operating temperature range: Must support -40°C minimum and 125°C maximum
- Write cycle time: 5ms or faster
- RoHS compliance: ROHS3 Compliant
Substitute parts are grouped into two categories: direct equivalents matching all primary parameters, and compatible alternatives with enhanced electrical specifications (higher clock frequency, extended temperature range, or automotive qualification) that maintain functional interchangeability.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temp | Write Cycle Time | Packaging | Automotive Grade |
|---|---|---|---|---|---|---|---|---|
| 25LC320AXT-E/ST | Microchip Technology | 32Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 5ms | Tape & Reel | No |
| AT25320B-XHL-B | Microchip Technology | 32Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | Tube | No |
| AT25320B-XHL-T | Microchip Technology | 32Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | Cut Tape & Digi-Reel | No |
| CAT25320YI-GT3 | onsemi | 32Kbit | 10 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | Tape & Reel | No |
| CAV25320YE-GT3 | onsemi | 32Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 5ms | Tape & Reel | Yes (AEC-Q100) |
| M95320-DFDW6TP | STMicroelectronics | 32Kbit | 20 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | Tape & Reel | No |
| M95320-DRDW3TP/K | STMicroelectronics | 32Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 125°C | 4ms | Cut Tape & Digi-Reel | Yes (AEC-Q100) |
| M95320-DWDW4TP/K | STMicroelectronics | 32Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 145°C | 4ms | Tape & Reel | Yes (AEC-Q100) |
Engineering Selection Recommendations
Direct Functional Equivalents: CAV25320YE-GT3 (onsemi) and M95320-DWDW4TP/K (STMicroelectronics) provide the closest functional match to the 25LC320AXT-E/ST. Both devices maintain the 10 MHz clock frequency, 2.5V ~ 5.5V supply voltage range, and -40°C ~ 125°C operating temperature specification. CAV25320YE-GT3 is available in Tape & Reel packaging with 1430 units in stock, while M95320-DWDW4TP/K offers automotive AEC-Q100 qualification with 4758 units in stock and extended temperature capability to 145°C.
Enhanced Performance Alternatives: AT25320B-XHL-T (Microchip Technology) and M95320-DRDW3TP/K (STMicroelectronics) provide doubled clock frequency (20 MHz) with faster write cycle times (4ms for M95320-DRDW3TP/K). M95320-DRDW3TP/K includes automotive AEC-Q100 qualification and supports the full -40°C ~ 125°C temperature range. AT25320B-XHL-T offers high inventory availability (15707 units) in Cut Tape & Digi-Reel packaging.
Standard Industrial Alternatives: CAT25320YI-GT3 (onsemi) and M95320-DFDW6TP (STMicroelectronics) match the 32Kbit capacity and SPI interface with 10 MHz and 20 MHz clock frequencies respectively. Both maintain ROHS3 compliance and operate across -40°C ~ 85°C temperature range.
All substitute parts maintain ROHS3 compliance, identical 8-TSSOP package dimensions, and non-volatile EEPROM memory technology. Selection should prioritize inventory availability, required clock frequency, automotive qualification status, and packaging format (Tape & Reel, Cut Tape, or Tube) based on assembly process requirements.
Frequently Asked Questions (FAQ)
Q: Can AT25320B-XHL-B or AT25320B-XHL-T replace the 25LC320AXT-E/ST directly?
A: Both AT25320B devices are functionally compatible as 32Kbit SPI EEPROM ICs in 8-TSSOP packages. However, they operate at -40°C ~ 85°C maximum temperature versus the original part's 125°C rating. AT25320B-XHL-B is packaged in Tube format while AT25320B-XHL-T uses Cut Tape & Digi-Reel packaging. Verify your assembly process compatibility with these packaging formats.
Q: What is the difference between M95320-DFDW6TP and M95320-DRDW3TP/K?
A: Both are STMicroelectronics M95320 32Kbit SPI EEPROM devices with 20 MHz clock frequency. M95320-DRDW3TP/K includes automotive AEC-Q100 qualification, supports -40°C ~ 125°C operating temperature, features 4ms write cycle time, and uses Cut Tape & Digi-Reel packaging. M95320-DFDW6TP operates at -40°C ~ 85°C, has 5ms write cycle time, and uses Tape & Reel packaging without automotive qualification.
Q: Is M95320-DWDW4TP/K suitable for automotive applications?
A: Yes. M95320-DWDW4TP/K carries AEC-Q100 automotive qualification, operates across -40°C ~ 145°C (exceeding the original part's 125°C maximum), maintains 2.5V ~ 5.5V supply voltage compatibility, and provides 4ms write cycle time. It is available in Tape & Reel packaging with 4758 units in stock.
Q: Can I use a 20 MHz clock frequency part as a substitute for a 10 MHz requirement?
A: Yes. Higher clock frequency parts are backward compatible with 10 MHz applications. Devices such as AT25320B-XHL-T, M95320-DFDW6TP, and M95320-DRDW3TP/K operate at 20 MHz but function correctly in circuits designed for 10 MHz operation. Verify your circuit design supports the lower voltage minimum (1.7V ~ 1.8V) of some 20 MHz variants if operating near the lower supply voltage boundary.
Q: What packaging formats are available for these substitute parts?
A: Substitute parts are available in three packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape (CT) & Digi-Reel for semi-automated processes, and Tube for manual or low-volume assembly. The 25LC320AXT-E/ST uses Tape & Reel. Verify your assembly equipment compatibility before selecting alternative packaging formats.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original 25LC320AXT-E/ST specification.
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