AT25040-10PI Equivalent & Substitute Parts

Part Overview

The AT25040-10PI is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new design implementations. The part operates across the industrial temperature range of -40°C to 85°C and is housed in an 8-DIP package suitable for through-hole mounting applications.

Substiute Parts

AT25040-10PI

Microchip TechnologyIn Stock: 4335AT25040-10PI Datasheet

Current PartRFQ

25AA040A-I/P

Microchip TechnologyIn Stock: 321225AA040A-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 25AA040A-I/P qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Memory capacity: 4Kbit with identical 512 x 8 organization
• Memory interface: SPI protocol compatibility
• Write cycle time: 5ms (identical performance)
• Operating temperature range: -40°C to 85°C (identical)
• Package form factor: 8-DIP (0.300", 7.62mm) with through-hole mounting
• Manufacturer: Microchip Technology (same source)

Enhanced Specifications:

• Clock frequency: 10 MHz (exceeds 3 MHz requirement, backward compatible)
• Supply voltage range: 1.8V ~ 5.5V (encompasses original 4.5V ~ 5.5V range)
• Product status: Active (currently manufactured and supported)
• RoHS compliance: ROHS3 Compliant (improved environmental standard)

Parameter Comparison

Engineering Selection Recommendations

The 25AA040A-I/P is the appropriate substitute for AT25040-10PI applications. Selection is based on:

Functional Equivalence: Both devices provide identical 4Kbit SPI EEPROM functionality with matching memory organization, interface protocol, and write performance characteristics.

Package Compatibility: Identical 8-DIP through-hole package ensures direct PCB footprint compatibility without layout modifications.

Performance Enhancement: The 25AA040A-I/P operates at 10 MHz clock frequency, exceeding the original 3 MHz specification while maintaining full backward compatibility with existing firmware and timing requirements.

Supply Voltage Flexibility: Extended supply voltage range (1.8V ~ 5.5V) provides greater design flexibility compared to the original 4.5V ~ 5.5V specification.

Compliance Status: The 25AA040A-I/P holds Active product status with ROHS3 compliance, ensuring long-term availability and alignment with current environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the 25AA040A-I/P directly replace the AT25040-10PI without PCB modifications?

A: Yes. Both devices use identical 8-DIP (0.300", 7.62mm) through-hole packages with matching pinout and footprint. No PCB layout changes are required.

Q: What is the significance of the higher 10 MHz clock frequency in the 25AA040A-I/P?

A: The 10 MHz specification indicates faster data transfer capability. This is backward compatible with systems designed for 3 MHz operation, as the substitute can operate at lower speeds. Existing firmware and timing parameters require no modification.

Q: Does the wider supply voltage range of the 25AA040A-I/P affect compatibility?

A: No. The 25AA040A-I/P accepts the original 4.5V ~ 5.5V supply range as a subset of its 1.8V ~ 5.5V capability. Systems powered within the original specification operate identically.

Q: Why is the AT25040-10PI classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 25AA040A-I/P represents the current production equivalent from Microchip Technology.

Q: Are there any firmware or software changes required when switching to the 25AA040A-I/P?

A: No. Both devices implement identical SPI protocol, memory organization (512 x 8), and write cycle timing (5ms). Existing firmware operates without modification.

Q: What is the difference between RoHS non-compliant and ROHS3 compliant status?

A: ROHS3 compliance indicates the 25AA040A-I/P meets current Restriction of Hazardous Substances regulations. The AT25040-10PI predates these requirements. For new designs and regulated applications, ROHS3 compliance is required.

Q: Is the 25AA040A-I/P available in the same packaging format?

A: Yes. Both parts are supplied in 8-PDIP (8-pin dual in-line package) format. The 25AA040A-I/P is available in Tube packaging for production quantities.