AT25040-10PC-2.7 Equivalent & Substitute Parts

Part Overview

The AT25040-10PC-2.7 is a 4Kbit EEPROM memory IC with SPI interface operating at 3 MHz, manufactured by Microchip Technology in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part supports a supply voltage range of 2.7V to 5.5V with a write cycle time of 5ms per word or page.

Substiute Parts

AT25040-10PC-2.7

Microchip TechnologyIn Stock: 994AT25040-10PC-2.7 Datasheet

Current PartRFQ

25AA040/P

Microchip TechnologyIn Stock: 74525AA040/P Datasheet

DirectRFQ

25C040/P

Microchip TechnologyIn Stock: 739725C040/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT25040-10PC-2.7 is determined by the following critical parameters:

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

Two substitute parts meet these core requirements with variations in clock frequency and supply voltage specifications. The 25AA040/P operates at 1 MHz with extended supply voltage range (1.8V ~ 5.5V), while the 25C040/P matches the original 3 MHz clock frequency but with restricted supply voltage (4.5V ~ 5.5V).

Parameter Comparison

Engineering Selection Recommendations

25C040/P is the primary substitute for direct replacement in applications requiring 3 MHz clock frequency operation. This part maintains identical clock speed and write cycle timing while offering active product status and ROHS3 compliance. The supply voltage range is restricted to 4.5V ~ 5.5V, requiring verification that system designs operate within this narrower window.

25AA040/P serves as an alternative substitute for applications tolerant of reduced clock frequency (1 MHz). This part provides the widest supply voltage range (1.8V ~ 5.5V), enabling operation in low-voltage system designs. The lower clock frequency may impact data transfer rates in timing-critical applications.

Both substitute parts are manufactured by Microchip Technology, share identical package geometry and memory organization, and maintain the same write cycle time as the original part. Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can 25AA040/P directly replace AT25040-10PC-2.7 in existing designs?

A: Yes, from a package and pinout perspective. However, the reduced clock frequency (1 MHz versus 3 MHz) may affect data transfer rates. Verify that your application can tolerate slower SPI communication speeds. The extended supply voltage range (1.8V ~ 5.5V) provides additional flexibility for low-voltage applications.

Q: What is the key difference between 25AA040/P and 25C040/P?

A: Clock frequency and supply voltage specifications differ. The 25AA040/P operates at 1 MHz with supply range 1.8V ~ 5.5V. The 25C040/P operates at 3 MHz with supply range 4.5V ~ 5.5V. Select based on your system's clock speed requirements and power supply specifications.

Q: Is 25C040/P suitable for 2.7V supply applications?

A: No. The 25C040/P minimum supply voltage is 4.5V, which exceeds the original part's 2.7V minimum. For applications requiring operation below 4.5V, use 25AA040/P instead.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both 25AA040/P and 25C040/P are ROHS3 compliant, whereas the original AT25040-10PC-2.7 is RoHS non-compliant. This compliance improvement supports modern manufacturing and environmental standards.

Q: Do the substitute parts maintain the same 8-DIP package dimensions?

A: Yes. Both substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical compatibility with existing PCB layouts and socket designs.