25LC256-I/SN

Overview

The Microchip Technology 25LC256-I/SN is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM. It operates on an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC = 4.5V to 5.5V. The device supports a supply voltage range of 2.5V to 5.5V and features a 64-byte page write capability. It includes block write protection for none, 1/4, 1/2, or all of the array, along with built-in power-on/off data protection. The component is housed in an 8-lead SOIC package and supports industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Supports high-speed SPI communication with up to 10 MHz clock frequency
• Includes hardware write-protect pin and software-configurable block protection levels
• Features self-timed erase and write cycles with automatic latch reset
• Provides hold functionality to pause serial transmission without resetting sequences

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Low-power embedded applications

Procurement Notes

Verify that the ordering suffix matches the required package type, as the base part number covers multiple packages including PDIP, SOIC, TSSOP, and DFN. Confirm the temperature grade suffix corresponds to the intended operating environment. Ensure the specific variant aligns with the required voltage range, as other family members may support lower voltages. Cross-reference the datasheet revision to confirm pinout and electrical characteristics match the design requirements.

Selection Notes

Select this component when an SPI interface is preferred over I2C for memory access. Choose the 25LC256 series specifically for its 2.5V minimum operating voltage, distinguishing it from the 1.8V capable 25AA256 variant. Consider the 8-lead SOIC package for standard surface mount assembly processes. Evaluate the 1 million cycle endurance and 200-year data retention specifications against long-term reliability requirements.

Part Context

This device belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional architectures but differs in voltage ranges and packaging options. The 'I' designation indicates the Industrial temperature grade, while the 'SN' suffix specifies the 8-lead Plastic Small Outline package. Other variants include the 25AA256 for wider voltage ranges and different package codes like ST for TSSOP.

Replacement Considerations

Direct substitutes within the same family include the 25LC256-I/ST (TSSOP package) and 25LC256-I/P (PDIP package). For lower voltage applications, the 25AA256 series offers compatible functionality with a 1.8V minimum supply. Verify pin compatibility and package dimensions when substituting across different package types.