25LC256-H/SN

Overview

The Microchip Technology 25LC256-H/SN is a mid-density serial electrically erasable programmable read-only memory (EEPROM) featuring a storage capacity of 256 Kbit organized as 32,768 x 8 bits. It utilizes a Serial Peripheral Interface (SPI) compatible bus architecture with a maximum clock frequency of 5 MHz at supply voltages between 4.5 V and 5.5 V. The device operates within an extended temperature range of -40°C to +150°C and supports a supply voltage from 2.5 V to 5.5 V. It is housed in an 8-lead narrow SOIC package.

Feature Summary

• Supports byte-level and page-level write operations with self-timed erase and write cycles.
• Includes built-in hardware write protection via the WP pin and software block protection for array segments.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Allows communication suspension via the HOLD pin without resetting the serial sequence.

Applications

• Industrial sensor nodes requiring high-temperature reliability
• Embedded systems needing non-volatile configuration storage
• Automotive electronics operating under extended thermal conditions

Procurement Notes

Verify that the ordering suffix 'H' corresponds to the extended temperature grade (-40°C to +150°C) and 'SN' indicates the 8-lead narrow SOIC package. Confirm the specific density matches the 256K bit requirement, as this datasheet covers multiple densities in the 25LCXXX family. Ensure compatibility with SPI Mode 0,0 or Mode 1,1 signaling requirements.

Selection Notes

Select this component when applications demand operation up to +150°C ambient temperature. The 256 Kbit capacity suits systems storing moderate amounts of calibration data or user settings. Verify that the system voltage falls within the 2.5 V to 5.5 V range and that the SPI controller supports the required 5 MHz clock speed at the operating voltage.

Part Context

This part belongs to the 25LCXXX family of mid-density serial EEPROMs from Microchip Technology. The family includes various densities ranging from 8 Kbit to 256 Kbit. The 'H' suffix denotes the extended industrial temperature grade, while 'SN' specifies the plastic small outline package type. These devices are designed for direct interface with microcontrollers supporting the SPI protocol.

Replacement Considerations

Consult the manufacturer's selection guide for alternative densities or packages within the 25LCXXX series. Verify pinout compatibility if substituting with other serial EEPROM families. Ensure any replacement supports the required extended temperature range and SPI interface timing characteristics.