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Equivalent & Substitute Parts for 25LC640AT-H/SN
Part Overview
The 25LC640AT-H/SN is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 5 MHz with 8-SOIC surface mount packaging. This non-volatile memory device operates across a supply voltage range of 2.5V to 5.5V and supports operating temperatures from -40°C to 150°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to support design flexibility, supply chain alternatives, and application-specific performance requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 64Kbit |
| Memory Organization | 8K x 8 |
| Memory Interface | SPI |
| Clock Frequency | 5 MHz |
| Write Cycle Time | 6ms |
| Voltage Supply Range | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 150°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 25LC640AT-H/SN is determined by the following critical parameters: 64Kbit memory capacity, 8K x 8 organization, SPI interface protocol, and 8-SOIC package footprint. Clock frequency, supply voltage range, operating temperature range, and write cycle time define performance tier compatibility. Parts are grouped into three categories:
Category 1 - Direct Equivalents: Identical electrical specifications and package dimensions. These parts are pin-compatible and functionally interchangeable without circuit modification.
Category 2 - Enhanced Performance Substitutes: Higher clock frequency (10 MHz or 20 MHz) or extended temperature range. These parts maintain backward compatibility while offering improved performance margins.
Category 3 - Automotive-Grade Alternatives: AEC-Q100 qualified parts with automotive temperature range (-40°C to 125°C) and enhanced reliability specifications.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Write Cycle Time | Voltage Supply | Operating Temperature | Package | Automotive Grade |
|---|---|---|---|---|---|---|---|---|
| 25LC640AT-H/SN | Microchip Technology | 64Kbit | 5 MHz | 6ms | 2.5V ~ 5.5V | -40°C ~ 150°C | 8-SOIC (3.90mm) | No |
| 25LC640A-H/SN | Microchip Technology | 64Kbit | 5 MHz | 6ms | 2.5V ~ 5.5V | -40°C ~ 150°C | 8-SOIC (3.90mm) | No |
| AT25640B-SSHL-B | Microchip Technology | 64Kbit | 20 MHz | 5ms | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | No |
| BR25G640FJ-3GE2 | Rohm Semiconductor | 64Kbit | 20 MHz | 5ms | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | No |
| BR25H640F-2CE2 | Rohm Semiconductor | 64Kbit | 10 MHz | 4ms | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (4.40mm) | Yes (AEC-Q100) |
| BR25H640F-2LBH2 | Rohm Semiconductor | 64Kbit | 5 MHz | 4ms | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | No |
| BR25L640FJ-WE2 | Rohm Semiconductor | 64Kbit | 5 MHz | 5ms | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | No |
| BR25S640F-WE2 | Rohm Semiconductor | 64Kbit | 20 MHz | 5ms | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (4.40mm) | No |
| BR25S640FJ-WE2 | Rohm Semiconductor | 64Kbit | 20 MHz | 5ms | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | No |
| CAT25640VI-GT3 | onsemi | 64Kbit | 20 MHz | 5ms | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | No |
| CAV25640VE-GT3 | onsemi | 64Kbit | 10 MHz | 5ms | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | Yes (AEC-Q100) |
Engineering Selection Recommendations
Direct Equivalent Selection: The 25LC640A-H/SN provides identical electrical and thermal specifications to the 25LC640AT-H/SN with verified programmability status and higher inventory availability (2116 units). This part is suitable for direct replacement in existing designs without circuit modification.
Performance-Enhanced Selection: The AT25640B-SSHL-B, BR25G640FJ-3GE2, BR25S640FJ-WE2, and CAT25640VI-GT3 offer 20 MHz clock frequency operation with reduced write cycle time (5ms). These parts are compatible with the 8-SOIC footprint and support lower minimum supply voltages (1.6V to 1.8V). Selection of these parts requires verification that the application circuit can tolerate the reduced operating temperature range (-40°C to 85°C).
Automotive-Grade Selection: The BR25H640F-2CE2 and CAV25640VE-GT3 are AEC-Q100 qualified with extended operating temperature range (-40°C to 125°C). The CAV25640VE-GT3 maintains the original 3.90mm package width and supports 10 MHz operation. The BR25H640F-2CE2 operates at 10 MHz with 4.40mm package width, requiring PCB layout verification for footprint compatibility.
Extended Temperature Range: The BR25H640F-2LBH2 provides 5 MHz operation matching the original part frequency with extended temperature range (-40°C to 125°C) and maintains the 3.90mm package width, offering a direct thermal upgrade path.
Frequently Asked Questions (FAQ)
Q: Can I use a 20 MHz part as a substitute for the 5 MHz 25LC640AT-H/SN?
A: Yes. The 20 MHz parts (AT25640B-SSHL-B, BR25G640FJ-3GE2, BR25S640FJ-WE2, CAT25640VI-GT3) are backward compatible. The SPI interface operates at the clock frequency set by the host controller, so a 20 MHz capable device functions correctly in a 5 MHz application. Verify that the operating temperature range of the substitute part meets your application requirements.
Q: What is the difference between 8-SOIC (3.90mm) and 8-SOIC (4.40mm) packages?
A: The package width differs. The 3.90mm width is the standard 8-SOIC footprint used by the original 25LC640AT-H/SN. The 4.40mm width (used by BR25H640F-2CE2 and BR25S640F-WE2) requires PCB layout verification to confirm footprint compatibility. Pin pitch and height remain identical.
Q: Are Rohm Semiconductor parts pin-compatible with Microchip Technology parts?
A: Yes. All listed Rohm parts (BR25 series) maintain identical SPI pinout and 8-SOIC package compatibility with Microchip 25LC640 and AT25640 series devices. Verify supply voltage and temperature range compatibility for your specific application.
Q: What does AEC-Q100 qualification mean?
A: AEC-Q100 is an automotive electronics reliability qualification standard. Parts bearing this qualification (BR25H640F-2CE2, CAV25640VE-GT3) have undergone enhanced testing for automotive applications and are rated for extended temperature ranges. These parts are suitable for automotive and industrial applications requiring higher reliability standards.
Q: Can I substitute a part with lower minimum supply voltage?
A: Yes, if your circuit design operates within the substitute part's voltage range. For example, AT25640B-SSHL-B operates at 1.8V minimum versus 2.5V for the original part. Ensure your power supply and circuit design support the lower voltage threshold if selecting such a part.
Q: What is the significance of write cycle time differences?
A: Write cycle time (4ms to 6ms) represents the duration required to complete a single page write operation. Shorter write times (4ms) enable faster data storage operations. If your application performs frequent write operations, selecting a part with shorter write cycle time improves overall system throughput.
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