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25LC640AT-M/SN Equivalent & Substitute Parts
Part Overview
The 25LC640AT-M/SN is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 10 MHz with 8K x 8 memory organization. This non-volatile memory device operates across a supply voltage range of 2.5V to 5.5V and supports operating temperatures from -55°C to 125°C. The component is packaged in 8-SOIC surface mount configuration and is ROHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified when equivalent memory capacity, interface protocol, and package compatibility are maintained while accommodating variations in clock frequency, voltage supply ranges, and operating temperature specifications.
Substiute Parts
Key Parameters
| Parameter | 25LC640AT-M/SN |
|---|---|
| Memory Size | 64Kbit |
| Memory Organization | 8K x 8 |
| Memory Interface | SPI |
| Clock Frequency | 10 MHz |
| Voltage Supply Range | 2.5V ~ 5.5V |
| Operating Temperature | -55°C ~ 125°C |
| Write Cycle Time | 5ms |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 25LC640AT-M/SN is determined by the following critical parameters:
Core Compatibility Requirements:
- Memory capacity: 64Kbit
- Memory organization: 8K x 8
- Interface protocol: SPI
- Package type: 8-SOIC surface mount with 0.154" (3.90mm) width
- RoHS compliance: ROHS3 Compliant
Variable Parameters Allowing Substitution:
- Clock frequency: 5 MHz to 20 MHz (original operates at 10 MHz)
- Voltage supply range: 1.7V to 5.5V (original operates at 2.5V to 5.5V)
- Operating temperature range: -40°C to 125°C (original operates at -55°C to 125°C)
- Write cycle time: 4ms to 5ms
- Manufacturer: Microchip Technology, Rohm Semiconductor, onsemi, STMicroelectronics
Substitute parts maintain the same memory capacity, organization, SPI interface, and 8-SOIC package footprint while accommodating different performance specifications and environmental ratings.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temperature | Write Cycle Time | Package | MSL Rating |
|---|---|---|---|---|---|---|---|---|
| 25LC640AT-M/SN | Microchip Technology | 64Kbit | 10 MHz | 2.5V ~ 5.5V | -55°C ~ 125°C | 5ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| AT25640B-SSHL-B | Microchip Technology | 64Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (0.154", 3.90mm) | 3 (168 Hours) |
| BR25H640F-2CE2 | Rohm Semiconductor | 64Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 4ms | 8-SOIC (0.173", 4.40mm) | 1 (Unlimited) |
| BR25H640F-2LBH2 | Rohm Semiconductor | 64Kbit | 5 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 4ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| BR25L640FJ-WE2 | Rohm Semiconductor | 64Kbit | 5 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| BR25S640F-WE2 | Rohm Semiconductor | 64Kbit | 20 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (0.173", 4.40mm) | 1 (Unlimited) |
| BR25S640FJ-WE2 | Rohm Semiconductor | 64Kbit | 20 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| CAT25640VI-GT3 | onsemi | 64Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| CAV25640VE-GT3 | onsemi | 64Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 5ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| M95640-DRMN3TP/K | STMicroelectronics | 64Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 125°C | 4ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
| M95640-DRMN8TP/K | STMicroelectronics | 64Kbit | 16 MHz | 1.8V ~ 5.5V | -40°C ~ 105°C | 4ms | 8-SOIC (0.154", 3.90mm) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Footprint Compatible Substitutes (8-SOIC 0.154" / 3.90mm):
AT25640B-SSHL-B operates at higher clock frequency (20 MHz) with extended voltage range down to 1.8V but operates at reduced temperature range (-40°C to 85°C). This part is suitable for applications not requiring the full -55°C lower temperature limit.
BR25H640F-2LBH2 provides identical voltage and temperature range to the original part with reduced clock frequency (5 MHz) and faster write cycle time (4ms). Suitable for applications with lower speed requirements.
BR25L640FJ-WE2 operates at 5 MHz with extended lower voltage support (1.8V) but reduced temperature range (-40°C to 85°C).
BR25S640FJ-WE2 provides 20 MHz operation with identical 8-SOIC footprint, extended lower voltage support (1.7V), but reduced temperature range (-40°C to 85°C).
CAT25640VI-GT3 operates at 20 MHz with extended lower voltage support (1.8V) and reduced temperature range (-40°C to 85°C).
CAV25640VE-GT3 matches the original 10 MHz clock frequency with identical voltage and temperature ranges, providing direct functional equivalence.
M95640-DRMN3TP/K operates at 20 MHz with extended lower voltage support (1.8V), maintains full temperature range (-40°C to 125°C), and features faster write cycle time (4ms).
M95640-DRMN8TP/K operates at 16 MHz with extended lower voltage support (1.8V) and faster write cycle time (4ms) but with reduced upper temperature limit (105°C).
Package Consideration:
BR25H640F-2CE2 and BR25S640F-WE2 feature 8-SOIC package with 0.173" (4.40mm) width, which differs from the original 0.154" (3.90mm) width and may require PCB layout verification.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a higher clock frequency than the original 25LC640AT-M/SN?
A: Yes. Parts operating at 20 MHz (AT25640B-SSHL-B, BR25S640F-WE2, BR25S640FJ-WE2, CAT25640VI-GT3, M95640-DRMN3TP/K) or 16 MHz (M95640-DRMN8TP/K) are backward compatible with applications designed for 10 MHz operation. The SPI interface remains identical, and higher clock frequency capability does not prevent operation at lower speeds.
Q: What is the impact of using a substitute with a lower operating temperature minimum?
A: Substitute parts with -40°C minimum operating temperature (instead of -55°C) are suitable for applications not requiring operation below -40°C. If your application requires operation at -55°C, select CAV25640VE-GT3, BR25H640F-2LBH2, or M95640-DRMN3TP/K.
Q: Are all substitute parts pin-compatible with the original 25LC640AT-M/SN?
A: All listed substitutes maintain 8-SOIC package configuration with identical pin count and SPI interface protocol. However, BR25H640F-2CE2 and BR25S640F-WE2 feature different package width (0.173" vs 0.154"), which may affect PCB footprint compatibility. Verify PCB layout before substitution.
Q: Which substitute provides the closest functional match to the original part?
A: CAV25640VE-GT3 provides direct functional equivalence with identical 10 MHz clock frequency, 2.5V to 5.5V voltage range, -40°C to 125°C operating temperature, and 8-SOIC (0.154", 3.90mm) package footprint.
Q: Can I substitute a part with lower voltage supply range?
A: Substitutes with lower minimum voltage (1.8V or 1.7V instead of 2.5V) are suitable only if your application operates within the substitute's voltage range. If your circuit requires 2.5V minimum operation, select parts maintaining 2.5V minimum: BR25H640F-2LBH2, CAV25640VE-GT3, or the original 25LC640AT-M/SN.
Q: What is the significance of MSL rating differences?
A: The original part features MSL 1 (Unlimited) moisture sensitivity, indicating no moisture absorption restrictions. AT25640B-SSHL-B features MSL 3 (168 Hours), requiring moisture control during storage and handling. Select MSL 1 rated parts for applications without moisture control infrastructure.
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