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25AA040AT-I/ST EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 25AA040AT-I/ST is a 4Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 1.8V to 5.5V and is rated for industrial temperature range (-40°C to 85°C). The part is ROHS3 compliant and currently in active production status with 3700 units in stock.
Equivalent and substitute parts are necessary when the original 25AA040AT-I/ST becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications (such as higher clock frequency or automotive qualification) are needed for system upgrades.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 4Kbit |
| Memory Organization | 512 x 8 |
| Memory Interface | SPI |
| Clock Frequency | 10 MHz |
| Write Cycle Time | 5ms |
| Supply Voltage Range | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | 8-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 25AA040AT-I/ST is determined by the following critical parameters:
Core Compatibility Requirements:
- Memory Size: 4Kbit (fixed requirement)
- Memory Organization: 512 x 8 (fixed requirement)
- Memory Interface: SPI (fixed requirement)
- Package Type: 8-TSSOP (fixed requirement)
- Supply Voltage Range: Must encompass or be compatible with 1.8V ~ 5.5V
- Operating Temperature: Must support minimum -40°C ~ 85°C range
Performance Parameters (Flexible):
- Clock Frequency: 10 MHz or higher (backward compatible)
- Write Cycle Time: 5ms or faster (backward compatible)
- Moisture Sensitivity Level: 1 or 3 acceptable (both meet reliability requirements)
Compliance Parameters:
- RoHS Status: ROHS3 Compliant (required)
- REACH Status: REACH Unaffected (required)
All substitute parts listed meet the core compatibility requirements and maintain electrical and mechanical interchangeability with the 25AA040AT-I/ST.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency (MHz) | Supply Voltage | Operating Temperature | Write Cycle Time (ms) | Packaging | MSL | Inventory |
|---|---|---|---|---|---|---|---|---|---|
| 25AA040AT-I/ST | Microchip Technology | 4Kbit | 10 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 3700 |
| AT25040B-XHL-B | Microchip Technology | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 3 | 2800 |
| AT25040B-XHL-T | Microchip Technology | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 3 | 18647 |
| CAT25040YI-GT3 | onsemi | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 60300 |
| M95040-DFDW6TP | STMicroelectronics | 4Kbit | 20 | 1.7V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 4760 |
| M95040-DRDW3TP/K | STMicroelectronics | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 125°C | 4 | 8-TSSOP | 1 | 18871 |
| M95040-DRDW8TP/K | STMicroelectronics | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 105°C | 4 | 8-TSSOP | 1 | 4532 |
| M95040-RDW6TP | STMicroelectronics | 4Kbit | 20 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 15964 |
| M95040-WDW6TP | STMicroelectronics | 4Kbit | 20 | 2.5V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 1437 |
| R1EX25004ATA00I#S0 | Renesas Electronics Corporation | 4Kbit | 5 | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 | 8-TSSOP | 1 | 3811 |
Engineering Selection Recommendations
Direct Substitutes (Identical Specifications): No substitute parts maintain identical specifications to the 25AA040AT-I/ST across all parameters. The original part operates at 10 MHz, while most alternatives operate at 20 MHz or 5 MHz.
Recommended Substitutes by Application:
For Standard Industrial Applications (-40°C to 85°C):
- CAT25040YI-GT3 (onsemi): Offers 20 MHz operation with highest inventory availability (60300 units). Maintains 1.8V ~ 5.5V supply range and MSL 1 rating. Electrically and mechanically compatible.
- M95040-RDW6TP (STMicroelectronics): Provides 20 MHz operation with 15964 units in stock. Identical supply voltage and temperature range to original part.
- AT25040B-XHL-T (Microchip Technology): Same manufacturer as original with 20 MHz operation and 18647 units available in Tape & Reel packaging.
For Automotive Applications (Extended Temperature or AEC-Q100 Qualification):
- M95040-DRDW3TP/K (STMicroelectronics): Automotive-grade with AEC-Q100 qualification, extended temperature range (-40°C to 125°C), and 4ms write cycle time.
- M95040-DRDW8TP/K (STMicroelectronics): Automotive-grade with AEC-Q100 qualification and -40°C to 105°C operating range.
For Lower Clock Frequency Applications:
- R1EX25004ATA00I#S0 (Renesas Electronics Corporation): Operates at 5 MHz with MSL 1 rating. Suitable where lower clock frequency is acceptable or preferred.
Voltage-Constrained Applications:
- M95040-WDW6TP (STMicroelectronics): Minimum supply voltage of 2.5V (versus 1.8V for original). Use only when 2.5V minimum supply is acceptable.
All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status.
Frequently Asked Questions (FAQ)
Q: Can I use a 20 MHz substitute part in place of the 10 MHz 25AA040AT-I/ST?
A: Yes. Higher clock frequency is backward compatible. A 20 MHz SPI EEPROM can operate at 10 MHz or lower speeds. The system interface will function correctly at the original 10 MHz specification.
Q: What is the difference between MSL 1 and MSL 3 ratings?
A: MSL 1 (Unlimited) indicates the component has unlimited shelf life under controlled storage conditions. MSL 3 (168 Hours) indicates the component must be used within 168 hours of moisture exposure after packaging is opened. Both ratings meet reliability requirements; MSL 1 provides longer shelf life flexibility.
Q: Are the automotive-qualified parts (M95040-DRDW3TP/K and M95040-DRDW8TP/K) suitable for non-automotive applications?
A: Yes. Automotive-qualified parts exceed industrial specifications and are fully compatible with standard industrial applications. They provide enhanced reliability margins and extended temperature operation.
Q: What is the significance of the different packaging codes (Tube, Tape & Reel, Cut Tape)?
A: Packaging format affects manufacturing process compatibility. Tape & Reel (TR) is standard for automated assembly. Cut Tape (CT) & Digi-Reel is suitable for lower-volume or mixed-component pick-and-place operations. Tube packaging is used for manual assembly or lower-volume applications. All formats contain electrically identical components.
Q: Can I substitute the 25AA040AT-I/ST with the R1EX25004ATA00I#S0 operating at 5 MHz?
A: Yes, electrically and mechanically. However, the 5 MHz clock frequency is lower than the original 10 MHz specification. Use this substitute only if your system can operate at 5 MHz or if lower clock speed is acceptable for your application.
Q: Is the M95040-WDW6TP suitable as a direct replacement?
A: The M95040-WDW6TP is mechanically and electrically compatible but has a minimum supply voltage of 2.5V versus 1.8V for the original part. Use this substitute only if your system supply voltage is 2.5V or higher.
Q: What is the advantage of using CAT25040YI-GT3 over other substitutes?
A: CAT25040YI-GT3 offers the highest inventory availability (60300 units), operates at 20 MHz with MSL 1 rating, and maintains full compatibility with the original 1.8V ~ 5.5V supply range and -40°C to 85°C temperature specification.
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