25LC256-E/SN

256Kbit SPI EEPROM, 10MHz, 2.5-5.5V, 64B page, 8-SOIC, -40~125°C Ext

6800

Effective Inventory

Go to Inquiry

Image for reference only

Manufacturer Part：

25LC256-E/SN

Package：

8-SOIC (0.154", 3.90mm width)

Description

Product Overview

The 25LC256-E/SN is a 256Kbit SPI Serial EEPROM from Microchip, organized as 32K x 8 bits. It supports SPI modes 0 and 3 with up to 10MHz clock frequency. The ‘E’ temperature suffix denotes extended range (-40°C to +125°C) in an 8-pin SOIC package.

Key Specifications

Memory Density	256Kbit (32KB)
Organization	32K x 8
Interface	SPI (modes 0 and 3)
Max Clock Frequency	10MHz
Supply Voltage	2.5V to 5.5V
Page Size	64 bytes
Write Cycle Time	5ms max
Write Protection	Quarter, Half, Whole Array
Endurance	1,000,000 cycles
Data Retention	>200 years
Package	8-SOIC (3.9mm width)
Operating Temperature	-40°C to +125°C

Features

10MHz SPI clock — fast read throughput
SPI modes 0 and 3 support
64-byte page write buffer
Block write protection (1/4, 1/2, or entire array)
Hardware write-protect pin (WP)
Self-timed erase/write cycle
AEC-Q100 qualified (automotive grade)

Applications

Automotive ECU configuration storage
Industrial control parameter storage
Medical device calibration data
Consumer electronics settings
Motor drive configuration memory

Product Introduction:25LC256-E/SN Product Introduction

The 25LC256-E/SN is a 256Kbit SPI Serial EEPROM from Microchip, organized as 32K x 8 bits with support for SPI modes 0 and 3 at up to 10MHz clock frequency. The extended temperature range (-40°C to +125°C) makes it suitable for automotive and harsh-environment applications. Block write protection allows protecting 1/4, 1/2, or the entire memory array, while the hardware WP pin prevents inadvertent writes. The 64-byte page buffer and self-timed write cycle simplify firmware design.

Working Principle:25LC256-E/SN Working Principle

The 25LC256 communicates via a 4-wire SPI bus (CS, SCK, SI, SO). To write data, the host first sends a Write Enable (WREN) instruction, then a Page Program instruction with a 16-bit address and up to 64 bytes of data. The device internally programs the page within 5ms. For read operations, the host sends a Read instruction with the starting address, then clocks out data bytes sequentially. Write protection is controlled by the Status Register: the BP1 and BP0 bits select 1/4, 1/2, or full array protection, while the WP pin provides hardware protection of the Status Register itself.

Pin Description:25LC256-E/SN Pin Definition and Functions

Pin	Name	Function
1	CS	Chip Select (active low)
2	SO	Serial Data Output
3	WP	Write Protect (active low)
4	VSS	Ground
5	SI	Serial Data Input
6	SCK	Serial Clock
7	HOLD	Suspend/Resume (active low)
8	VCC	Power Supply