AT25040B-SSPD-T Equivalent & Substitute Parts

Part Overview

The AT25040B-SSPD-T is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, designed for SPI serial interface applications operating at 5 MHz. This non-volatile memory device is qualified to AEC-Q100 automotive standards and operates across the temperature range of -40°C to 125°C. The part is currently in active production status with 4050 units available in inventory. Substitute parts are identified when equivalent electrical and mechanical specifications are met, enabling design flexibility and supply chain continuity for applications requiring 4Kbit SPI EEPROM functionality in 8-SOIC packaging.

Substiute Parts

AT25040B-SSPD-T

Microchip TechnologyIn Stock: 4091AT25040B-SSPD-T Datasheet

Current PartRFQ

CAV25040VE-GT3

onsemiIn Stock: 1423CAV25040VE-GT3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25040B-SSPD-T is determined by strict equivalence in the following critical parameters:

• Memory Size: 4Kbit (non-negotiable)
• Memory Format: EEPROM (non-negotiable)
• Memory Interface: SPI (non-negotiable)
• Memory Organization: 512 x 8 (non-negotiable)
• Package / Case: 8-SOIC (non-negotiable)
• Voltage Supply Range: 2.5V ~ 5.5V (must be compatible)
• Operating Temperature: -40°C ~ 125°C (must be compatible)
• Mounting Type: Surface Mount (non-negotiable)
• Grade: Automotive (non-negotiable)
• Qualification: AEC-Q100 (non-negotiable)

The Clock Frequency parameter may exceed the minimum requirement of 5 MHz, as higher frequency operation is backward compatible with applications designed for lower frequencies. All substitute parts must maintain full compliance with automotive qualification standards and RoHS directives.

Parameter Comparison

Engineering Selection Recommendations

The CAV25040VE-GT3 from onsemi qualifies as a direct substitute for the AT25040B-SSPD-T based on electrical and mechanical equivalence. Both devices meet identical automotive qualification requirements (AEC-Q100), operate within the same voltage and temperature specifications, and are packaged in the same 8-SOIC form factor. The CAV25040VE-GT3 operates at 10 MHz clock frequency, which exceeds the 5 MHz specification of the primary part and is fully backward compatible with applications designed for the lower frequency. Both parts maintain ROHS3 compliance and are suitable for automotive-grade applications. The CAV25040VE-GT3 offers improved moisture handling characteristics (MSL 1 versus MSL 3), which may provide additional reliability margin in high-humidity storage or assembly environments.

Frequently Asked Questions (FAQ)

Q: Can the CAV25040VE-GT3 be used as a direct replacement for the AT25040B-SSPD-T?

A: Yes. Both parts are 4Kbit SPI EEPROM devices in 8-SOIC packaging with identical memory organization (512 x 8), voltage supply range (2.5V ~ 5.5V), operating temperature range (-40°C ~ 125°C), and automotive AEC-Q100 qualification. The CAV25040VE-GT3 operates at 10 MHz, which is compatible with applications designed for 5 MHz operation.

Q: Are there any differences in package dimensions between these parts?

A: No. Both the AT25040B-SSPD-T and CAV25040VE-GT3 use the 8-SOIC package with identical dimensions (0.154" width, 3.90mm width). They are mechanically interchangeable on the PCB.

Q: What is the significance of the different clock frequencies?

A: The CAV25040VE-GT3 operates at 10 MHz while the AT25040B-SSPD-T operates at 5 MHz. Higher clock frequency capability does not affect compatibility; applications designed for 5 MHz operation will function correctly with the 10 MHz part.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both the AT25040B-SSPD-T and CAV25040VE-GT3 are qualified to AEC-Q100 automotive standards and are suitable for automotive-grade applications.

Q: What is the difference in Moisture Sensitivity Level (MSL)?

A: The AT25040B-SSPD-T has MSL 3 (168 hours), while the CAV25040VE-GT3 has MSL 1 (unlimited). MSL 1 indicates superior moisture resistance and may provide extended shelf life and improved reliability in humid environments.

Q: Are both parts RoHS compliant?

A: Yes. Both the AT25040B-SSPD-T and CAV25040VE-GT3 are ROHS3 compliant and meet environmental regulatory requirements.