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Equivalent & Substitute Parts for 25AA040T/SN
Part Overview
The 25AA040T/SN is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 1 MHz with 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The device operates across a supply voltage range of 1.8V to 5.5V with a standard operating temperature range of 0°C to 70°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 4Kbit |
| Memory Organization | 512 x 8 |
| Memory Interface | SPI |
| Clock Frequency | 1 MHz |
| Write Cycle Time | 5ms |
| Voltage Supply Range | 1.8V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the 25AA040T/SN is determined by the following critical parameters: memory capacity (4Kbit), memory organization (512 x 8), SPI interface protocol, package type (8-SOIC with 0.154" width), and voltage supply compatibility (1.8V ~ 5.5V minimum). Parts are grouped into three categories based on operational characteristics:
Category 1: Direct Microchip Technology Equivalents — Parts maintaining identical base product number (25AA040) with enhanced specifications. These include 25AA040AT-I/SN and 25AA040T-I/SN, which offer extended operating temperature ranges (-40°C to 85°C) and active product status while maintaining full electrical compatibility.
Category 2: Microchip AT25040 Series — Parts with higher clock frequency ratings (5 MHz to 20 MHz) and extended temperature ranges. These include AT25040B-SSHL-B, AT25040B-SSHL-T, and AT25040B-SSPD-T, which provide backward compatibility with enhanced performance margins.
Category 3: Cross-Manufacturer Alternatives — Parts from Rohm Semiconductor and onsemi that meet the same 4Kbit capacity, SPI interface, and 8-SOIC packaging requirements. These include BR25L040FJ-WE2, CAT25040VI-GT3, CAV25040VE-GT3, and BR25H040F-2CE2.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temperature | Package | Product Status |
|---|---|---|---|---|---|---|---|
| 25AA040T/SN | Microchip Technology | 4Kbit | 1 MHz | 1.8V ~ 5.5V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| 25AA040AT-I/SN | Microchip Technology | 4Kbit | 10 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active |
| 25AA040T-I/SN | Microchip Technology | 4Kbit | 1 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active |
| AT25040B-SSHL-B | Microchip Technology | 4Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active |
| AT25040B-SSHL-T | Microchip Technology | 4Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active |
| AT25040B-SSPD-T | Microchip Technology | 4Kbit | 5 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC | Active |
| BR25H040F-2CE2 | Rohm Semiconductor | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOP | Active |
| BR25L040FJ-WE2 | Rohm Semiconductor | 4Kbit | 5 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J | Not For New Designs |
| CAT25040VI-G | onsemi | 4Kbit | Not Specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Obsolete |
| CAT25040VI-GT3 | onsemi | 4Kbit | Not Specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active |
| CAV25040VE-GT3 | onsemi | 4Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC | Active |
Engineering Selection Recommendations
For applications requiring direct replacement with minimal design changes, 25AA040T-I/SN is the primary equivalent, offering identical 1 MHz clock frequency and 8-SOIC packaging while providing extended operating temperature range and active product status.
For new designs or applications tolerating higher clock frequencies, 25AA040AT-I/SN provides 10 MHz operation with full voltage compatibility and active status. The AT25040B series (SSHL-B, SSHL-T, SSPD-T) offers enhanced performance with 5 MHz to 20 MHz clock frequencies and extended temperature ranges, suitable for demanding environments.
Cross-manufacturer alternatives CAT25040VI-GT3 and CAV25040VE-GT3 from onsemi provide active product status with equivalent 4Kbit capacity and SPI interface. CAV25040VE-GT3 includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components.
BR25L040FJ-WE2 from Rohm Semiconductor is classified as "Not For New Designs" and should be avoided for new development. BR25H040F-2CE2 provides automotive qualification with 10 MHz operation but features 8-SOP packaging (0.173" width) requiring PCB layout verification.
All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can 25AA040AT-I/SN replace 25AA040T/SN in existing designs?
A: Yes. Both parts share identical 4Kbit capacity, 512 x 8 organization, SPI interface, 8-SOIC packaging, and 1.8V to 5.5V supply voltage range. The 25AA040AT-I/SN operates at 10 MHz (versus 1 MHz) and supports extended temperature range (-40°C to 85°C versus 0°C to 70°C), making it a direct functional replacement with enhanced specifications.
Q: What is the difference between AT25040B-SSHL-B and AT25040B-SSHL-T?
A: Both parts are identical in electrical specifications (4Kbit, 20 MHz, 8-SOIC) and operating temperature range (-40°C to 85°C). The difference is packaging format: SSHL-B is supplied in Tube packaging, while SSHL-T is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.
Q: Are onsemi CAT25040VI-GT3 and Rohm BR25L040FJ-WE2 interchangeable?
A: Both parts meet 4Kbit capacity, SPI interface, and 1.8V to 5.5V supply requirements. However, BR25L040FJ-WE2 is classified as "Not For New Designs," limiting its use to legacy system maintenance. CAT25040VI-GT3 is active and preferred for new applications. Electrical compatibility is confirmed, but product lifecycle status differs.
Q: Does package width difference between 8-SOIC (0.154") and 8-SOP (0.173") affect substitution?
A: Package width differences require PCB layout verification. BR25H040F-2CE2 features 8-SOP packaging at 0.173" width versus standard 8-SOIC at 0.154". Physical footprint compatibility must be confirmed before substitution. Pin pitch and lead configuration should also be verified against PCB design specifications.
Q: Which substitute part supports the widest operating temperature range?
A: AT25040B-SSPD-T and CAV25040VE-GT3 both support -40°C to 125°C operating temperature range, providing the widest thermal envelope. Both are active products with automotive qualification (AEC-Q100). AT25040B-SSPD-T operates at 5 MHz with 2.5V to 5.5V supply, while CAV25040VE-GT3 operates at 10 MHz with identical voltage range.
Q: Is automotive qualification required for 25AA040T/SN replacement?
A: Automotive qualification is not inherent to the original 25AA040T/SN. However, if the application requires AEC-Q100 certification, AT25040B-SSPD-T and CAV25040VE-GT3 provide this qualification. Standard industrial-grade alternatives (25AA040AT-I/SN, CAT25040VI-GT3) are suitable for non-automotive applications.
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