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Equivalent & Substitute Parts for 25LC040A-H/SN
Part Overview
The 25LC040A-H/SN is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 10 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 732 units in stock inventory.
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand alternative electrical specifications (such as higher clock frequency or extended temperature ranges), or when different packaging formats are required for manufacturing optimization.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Type | Non-Volatile EEPROM |
| Memory Size | 4Kbit |
| Memory Organization | 512 x 8 |
| Interface | SPI |
| Clock Frequency | 10 MHz |
| Write Cycle Time | 5ms |
| Supply Voltage 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 25LC040A-H/SN is determined by the following critical parameters:
Primary Substitution Criteria:
- Memory capacity: 4Kbit (512 x 8 organization)
- Interface protocol: SPI
- Package compatibility: 8-SOIC form factor with 0.154" width (3.90mm)
- Supply voltage overlap: Minimum 2.5V support required
- Operating temperature range: Must support -40°C minimum
Secondary Compatibility Factors:
- Clock frequency: 10 MHz or higher acceptable
- Write cycle time: 5ms or faster acceptable
- RoHS3 compliance required
Substitute parts are grouped into three categories based on packaging and electrical specifications:
Category 1 - Direct Package Match (8-SOIC 0.154" width): AT25040B-SSHL-B, BR25H040FJ-2CE2, CAT25040VI-GT3, CAV25040VE-GT3
Category 2 - Alternative SOP Package (8-SOP 0.173" width): BR25H040F-2CE2, BR25H040F-2LBH2
Category 3 - Compact Package Variants (8-TDFN, 8-SOP-J): CAT25040VP2I-GT3, BR25L040FJ-WE2
Category 4 - Legacy/Discontinued Status: BR25L040F-WE2, CAT25040VI-G
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Supply Voltage | Operating Temp | Package | Status | Inventory |
|---|---|---|---|---|---|---|---|---|
| 25LC040A-H/SN | Microchip | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 150°C | 8-SOIC (0.154") | Active | 732 |
| AT25040B-SSHL-B | Microchip | 4Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154") | Active | 9000 |
| BR25H040F-2CE2 | Rohm | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOP (0.173") | Active | 1731 |
| BR25H040F-2LBH2 | Rohm | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOP (0.173") | Active | 1296 |
| BR25H040FJ-2CE2 | Rohm | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOP-J (0.154") | Active | 3173 |
| BR25L040F-WE2 | Rohm | 4Kbit | 5 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP (0.173") | Not For New Designs | 1234 |
| BR25L040FJ-WE2 | Rohm | 4Kbit | 5 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (0.154") | Not For New Designs | 807 |
| CAT25040VI-G | onsemi | 4Kbit | Not Specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154") | Obsolete | 696 |
| CAT25040VI-GT3 | onsemi | 4Kbit | Not Specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154") | Active | 49300 |
| CAT25040VP2I-GT3 | onsemi | 4Kbit | Not Specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TDFN (2x3) | Active | 8432 |
| CAV25040VE-GT3 | onsemi | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (0.154") | Active | 1370 |
Engineering Selection Recommendations
For Direct Pin-Compatible Replacement (8-SOIC 0.154" package):
AT25040B-SSHL-B is the primary recommendation when higher clock frequency (20 MHz) is acceptable. This part maintains the same package footprint and offers superior performance headroom. However, the operating temperature range is limited to -40°C to 85°C, which is narrower than the original part's -40°C to 150°C specification.
CAT25040VI-GT3 provides the largest inventory availability (49,300 units) with active product status. This onsemi part maintains 8-SOIC packaging and operates across -40°C to 85°C. The lower supply voltage floor (1.8V vs 2.5V) provides additional design flexibility.
CAV25040VE-GT3 is suitable for automotive applications requiring AEC-Q100 qualification. This part matches the original 10 MHz clock frequency and 2.5V to 5.5V supply range, with extended temperature operation to 125°C.
For Alternative Package Formats:
BR25H040FJ-2CE2 offers the same 8-SOIC footprint width (0.154") as the original part while using Rohm's SOP-J package variant. This part includes AEC-Q100 automotive qualification and maintains 10 MHz operation with 2.5V to 5.5V supply range.
CAT25040VP2I-GT3 provides a compact 8-TDFN (2x3) package option for space-constrained designs. This onsemi part is actively produced with high inventory (8,432 units).
Parts to Avoid for New Designs:
BR25L040F-WE2 and BR25L040FJ-WE2 carry "Not For New Designs" status and should not be selected for new development projects. CAT25040VI-G is obsolete and unsuitable for production use.
Frequently Asked Questions (FAQ)
Q: Can AT25040B-SSHL-B replace 25LC040A-H/SN in all applications?
A: AT25040B-SSHL-B is electrically compatible for SPI interface and memory capacity. However, the operating temperature range differs: AT25040B-SSHL-B operates -40°C to 85°C while 25LC040A-H/SN operates -40°C to 150°C. Verify your application does not require operation above 85°C. The higher 20 MHz clock frequency is backward compatible with 10 MHz designs.
Q: What is the difference between 8-SOIC and 8-SOP packages?
A: Both are 8-pin surface mount packages with similar pinouts for this memory family. The primary difference is physical dimensions: 8-SOIC (0.154" width) is narrower than 8-SOP (0.173" width). Parts using 8-SOP require PCB layout adjustment and cannot use identical footprints designed for 8-SOIC.
Q: Why does CAT25040VI-GT3 have higher inventory than the original part?
A: CAT25040VI-GT3 is actively produced by onsemi with 49,300 units in stock, compared to 732 units of 25LC040A-H/SN. Higher inventory reflects current market demand and production allocation. This part is suitable for new designs requiring 4Kbit SPI EEPROM in 8-SOIC packaging.
Q: Is CAV25040VE-GT3 suitable for automotive applications?
A: Yes. CAV25040VE-GT3 carries AEC-Q100 automotive qualification and is graded for automotive use. This part matches the original 10 MHz clock frequency and 2.5V to 5.5V supply specification, with operating temperature range of -40°C to 125°C.
Q: Can I use CAT25040VP2I-GT3 as a direct replacement?
A: CAT25040VP2I-GT3 uses 8-TDFN (2x3) packaging instead of 8-SOIC, requiring different PCB footprint and layout. The pinout is compatible for SPI interface and memory capacity. This part is suitable only if your PCB design can accommodate the compact TDFN package.
Q: What does "Not For New Designs" status mean?
A: Parts marked "Not For New Designs" (BR25L040F-WE2, BR25L040FJ-WE2) are in production but not recommended for new product development. These parts may have limited long-term availability or are being phased out. Use only for legacy product support or maintenance.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance status, matching the original 25LC040A-H/SN specification.
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