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25LC040AT-H/SN EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 25LC040AT-H/SN is a 4Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIC surface mount configuration. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and temperature range of -40°C to 150°C. The part is currently active in production and ROHS3 compliant.
Equivalent and substitute parts are necessary when the original part becomes unavailable, when alternative packaging or performance specifications better suit application requirements, or when design flexibility demands component options from multiple manufacturers while maintaining functional compatibility.
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 | 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 25LC040AT-H/SN is determined by the following critical parameters:
Core Functional Requirements:
- Memory Size: 4Kbit (512 x 8 organization)
- Memory Interface: SPI
- Memory Type: Non-Volatile EEPROM
Electrical Compatibility:
- Supply Voltage: Must support 2.5V minimum and 5.5V maximum
- Clock Frequency: 10 MHz or higher (backward compatible)
- Write Cycle Time: 5ms or faster
Physical Compatibility:
- Package Type: 8-SOIC or equivalent footprint (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
Compliance Requirements:
- RoHS3 Compliant
- REACH Unaffected
Substitute parts are grouped into two categories: direct equivalents with identical electrical and physical specifications, and functional substitutes with enhanced or alternative specifications that maintain full compatibility within the defined parameter ranges.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Memory Size | Clock Frequency (MHz) | Supply Voltage (V) | Operating Temperature (°C) | Package Type | Write Cycle Time (ms) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| 25LC040AT-H/SN | Microchip Technology | 4Kbit | 10 | 2.5 ~ 5.5 | -40 ~ 150 | 8-SOIC (0.154", 3.90mm) | 5 | Active | ROHS3 |
| AT25040B-SSHL-B | Microchip Technology | 4Kbit | 20 | 1.8 ~ 5.5 | -40 ~ 85 | 8-SOIC (0.154", 3.90mm) | 5 | Active | ROHS3 |
| BR25H040F-2CE2 | Rohm Semiconductor | 4Kbit | 10 | 2.5 ~ 5.5 | -40 ~ 125 | 8-SOIC (0.173", 4.40mm) | 4 | Active | ROHS3 |
| BR25H040F-2LBH2 | Rohm Semiconductor | 4Kbit | 10 | 2.5 ~ 5.5 | -40 ~ 125 | 8-SOIC (0.173", 4.40mm) | 4 | Active | ROHS3 |
| BR25H040FJ-2CE2 | Rohm Semiconductor | 4Kbit | 10 | 2.5 ~ 5.5 | -40 ~ 125 | 8-SOIC (0.154", 3.90mm) | 4 | Active | ROHS3 |
| BR25L040F-WE2 | Rohm Semiconductor | 4Kbit | 5 | 1.8 ~ 5.5 | -40 ~ 85 | 8-SOIC (0.173", 4.40mm) | 5 | Not For New Designs | ROHS3 |
| BR25L040FJ-WE2 | Rohm Semiconductor | 4Kbit | 5 | 1.8 ~ 5.5 | -40 ~ 85 | 8-SOIC (0.154", 3.90mm) | 5 | Not For New Designs | ROHS3 |
| CAT25040VI-G | onsemi | 4Kbit | Not Specified | 1.8 ~ 5.5 | -40 ~ 85 | 8-SOIC (0.154", 3.90mm) | 5 | Obsolete | ROHS3 |
| CAT25040VI-GT3 | onsemi | 4Kbit | Not Specified | 1.8 ~ 5.5 | -40 ~ 85 | 8-SOIC (0.154", 3.90mm) | 5 | Active | ROHS3 |
| CAT25040VP2I-GT3 | onsemi | 4Kbit | Not Specified | 1.8 ~ 5.5 | -40 ~ 85 | 8-TDFN (2x3) | 5 | Active | ROHS3 |
| CAV25040VE-GT3 | onsemi | 4Kbit | 10 | 2.5 ~ 5.5 | -40 ~ 125 | 8-SOIC (0.154", 3.90mm) | 5 | Active | ROHS3 |
Engineering Selection Recommendations
Direct Equivalents (Identical Footprint and Electrical Specifications):
BR25H040FJ-2CE2 and CAV25040VE-GT3 are direct functional equivalents to the 25LC040AT-H/SN. Both maintain the 8-SOIC (0.154", 3.90mm) package footprint, 4Kbit capacity, 10 MHz clock frequency, and 2.5V to 5.5V supply voltage range. BR25H040FJ-2CE2 offers automotive-grade qualification (AEC-Q100) with extended temperature range to -40°C to 125°C. CAV25040VE-GT3 provides identical electrical specifications with automotive qualification. Both parts are active in production and ROHS3 compliant.
Enhanced Performance Substitutes:
AT25040B-SSHL-B provides doubled clock frequency (20 MHz) while maintaining 4Kbit capacity and 8-SOIC footprint. This part operates at 1.8V to 5.5V supply voltage with reduced operating temperature range (-40°C to 85°C). The enhanced frequency specification is backward compatible with 10 MHz applications.
Alternative Package Options:
CAT25040VI-GT3 offers identical electrical performance in the standard 8-SOIC (0.154", 3.90mm) package with active product status. CAT25040VP2I-GT3 provides the same 4Kbit capacity and SPI interface in a compact 8-TDFN (2x3) package for space-constrained applications, with active product status and full ROHS3 compliance.
Legacy Parts (Not Recommended for New Designs):
BR25L040F-WE2 and BR25L040FJ-WE2 are marked "Not For New Designs" and operate at reduced 5 MHz clock frequency. These parts are suitable only for replacement or maintenance applications where the original specification is required.
Frequently Asked Questions (FAQ)
Q: Can AT25040B-SSHL-B replace 25LC040AT-H/SN in existing designs?
A: Yes. AT25040B-SSHL-B maintains the same 4Kbit capacity, SPI interface, 8-SOIC footprint, and 5ms write cycle time. The 20 MHz clock frequency is backward compatible with 10 MHz applications. The reduced operating temperature range (-40°C to 85°C versus -40°C to 150°C) must be evaluated against application requirements.
Q: What is the difference between BR25H040FJ-2CE2 and BR25H040F-2CE2?
A: Both parts are identical in electrical specifications (4Kbit, 10 MHz, 2.5V to 5.5V, -40°C to 125°C). BR25H040FJ-2CE2 uses the 8-SOIC (0.154", 3.90mm) package matching the original 25LC040AT-H/SN footprint. BR25H040F-2CE2 uses the larger 8-SOIC (0.173", 4.40mm) package and requires PCB layout modification.
Q: Is CAT25040VP2I-GT3 compatible with the original 25LC040AT-H/SN?
A: CAT25040VP2I-GT3 is electrically compatible (4Kbit, SPI, 1.8V to 5.5V, 5ms write cycle) but uses a different package footprint (8-TDFN 2x3 versus 8-SOIC). PCB redesign is required for this substitution.
Q: Why are BR25L040F-WE2 and BR25L040FJ-WE2 marked "Not For New Designs"?
A: These parts operate at 5 MHz clock frequency, half the speed of the original 25LC040AT-H/SN. They are retained for legacy system maintenance only. New designs should use active-status alternatives.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the original 25LC040AT-H/SN.
Q: Which substitute offers the widest operating temperature range?
A: The original 25LC040AT-H/SN operates from -40°C to 150°C. No substitute part in the list extends beyond this range. BR25H040F-2CE2, BR25H040F-2LBH2, BR25H040FJ-2CE2, and CAV25040VE-GT3 operate to -40°C to 125°C, suitable for most industrial applications.
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