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Microchip 25AA040X/ST - High-Performance 4Kbit SPI EEPROM

The 25AA040X/ST from Microchip Technology is a reliable 4Kbit (512 x 8) serial EEPROM designed for embedded applications requiring non-volatile memory storage. With its wide voltage range of 1.8V to 5.5V and SPI interface, this component offers exceptional flexibility for battery-powered devices, industrial controls, and consumer electronics.

Key Features & Benefits

  • Wide Voltage Operation: 1.8V to 5.5V supply range ensures compatibility with various system designs
  • Fast SPI Interface: 1 MHz clock frequency for efficient data transfer
  • Compact 8-TSSOP Package: Space-saving surface mount design (0.173", 4.40mm width)
  • Low Power Consumption: Ideal for battery-operated and energy-efficient applications
  • Reliable Data Retention: Non-volatile EEPROM technology ensures data integrity
  • 5ms Write Cycle: Quick page write operations for responsive performance

Common Applications

  • Configuration data storage in embedded systems
  • Calibration data retention for sensors and instruments
  • User settings and preferences in consumer devices
  • Serial number and security code storage
  • Industrial automation and control systems
  • Medical device data logging

Why Choose HQICKEY?

At HQICKEY, we guarantee 100% authentic semiconductor components with full manufacturer warranty support. Every 25AA040X/ST unit is sourced directly from authorized distributors and undergoes rigorous quality verification. We offer global shipping with secure packaging to ensure your components arrive in perfect condition.


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Product attributes Property Value
Manufacturer Microchip Technology
Product Series
Packaging Tube |
Memory Type Non-Volatile
Memory Format EEPROM
Technology EEPROM
Memory Size 4Kbit
Memory Organization 512 x 8
Memory Interface SPI
Clock Frequency 1 MHz
Write Cycle Time - Word, Page 5ms
Access Time -
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature 0°C ~ 70°C (TA)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 8-TSSOP (0.173", 4.40mm Width)
Supplier Device Package 8-TSSOP
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