AT25040-10PC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT25040-10PC is a 4Kbit Serial Peripheral Interface (SPI) EEPROM memory integrated circuit manufactured by Microchip Technology. This device operates at 3 MHz clock frequency with a supply voltage range of 4.5V to 5.5V and is housed in an 8-DIP through-hole package. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

AT25040-10PC

Microchip TechnologyIn Stock: 804AT25040-10PC Datasheet

Current PartRFQ

25AA040/P

Microchip TechnologyIn Stock: 74525AA040/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the AT25040-10PC is determined by the following critical parameters:

• Memory capacity (4Kbit) and organization (512 x 8)
• SPI interface protocol
• Package form factor (8-DIP through-hole)
• Write cycle time (5ms)
• Operating temperature range (0°C ~ 70°C)

The 25AA040/P qualifies as a direct substitute based on matching memory size, organization, interface type, write cycle time, and identical package specifications. While the 25AA040/P operates at a lower maximum clock frequency (1 MHz versus 3 MHz) and supports a wider supply voltage range (1.8V ~ 5.5V), these differences do not prevent functional substitution in applications designed for the AT25040-10PC. The lower clock frequency represents a conservative operational characteristic suitable for legacy system integration.

Parameter Comparison

Engineering Selection Recommendations

The 25AA040/P is the qualified substitute for the AT25040-10PC based on functional equivalence and component availability. The substitute part maintains active product status with verified programmability and ROHS3 compliance, providing advantages for new designs and long-term supply chain stability. The AT25040-10PC obsolete status necessitates transition to the 25AA040/P for ongoing production support.

The 25AA040/P operates within the supply voltage range of the original part and maintains identical memory capacity, organization, and interface specifications. The reduced maximum clock frequency (1 MHz) does not compromise functionality in applications originally specified for 3 MHz operation, as SPI interface timing is typically determined by system requirements rather than device maximum ratings.

Frequently Asked Questions (FAQ)

Q: Can the 25AA040/P directly replace the AT25040-10PC in existing circuit designs?

A: Yes. Both devices share identical memory capacity (4Kbit), organization (512 x 8), SPI interface protocol, write cycle time (5ms), and 8-DIP package specifications. The 25AA040/P operates within the supply voltage range of the original part and is pin-compatible for through-hole mounting applications.

Q: What is the significance of the different clock frequency ratings?

A: The AT25040-10PC specifies a maximum clock frequency of 3 MHz, while the 25AA040/P specifies 1 MHz. In SPI interface applications, the actual clock frequency is controlled by the host system, not the memory device. The substitute part's lower maximum rating does not prevent operation at frequencies up to its rated limit and is suitable for legacy system integration.

Q: Are there compliance differences between these parts?

A: The AT25040-10PC is classified as RoHS non-compliant and obsolete. The 25AA040/P is ROHS3 compliant and maintains active product status, providing advantages for regulatory compliance and long-term availability.

Q: What is the supply voltage compatibility?

A: The AT25040-10PC operates at 4.5V to 5.5V. The 25AA040/P operates at 1.8V to 5.5V, providing a wider voltage range. Both parts function correctly when supplied within the original part's voltage specification of 4.5V to 5.5V.

Q: Are both parts available in the same packaging?

A: Yes. Both the AT25040-10PC and 25AA040/P are supplied in 8-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations and mechanical dimensions.