25LC128T-E/MF

Overview

The Microchip Technology 25LC128T-E/MF is a 128 Kbit Serial Electrically Erasable PROM featuring a 16,384 x 8-bit organization. It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at voltages between 4.5V and 5.5V. The device utilizes an SPI-compatible interface with separate data in (SI) and data out (SO) lines. It is housed in an 8-lead DFN package and is rated for an extended operating temperature range from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via a standard SPI bus with a maximum clock frequency of 10 MHz.
• Includes hardware write protection capabilities controlled by the WP pin and STATUS register bits.
• Features a HOLD input that allows suspension of serial transmission without resetting the sequence.
• Provides non-volatile storage with high endurance and long-term data retention specifications.

Applications

• Data logging systems requiring persistent storage of sensor readings or event logs.
• Configuration storage for microcontroller-based embedded devices.
• Calibration data retention in industrial control equipment.
• Parameter storage in automotive electronic modules.

Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and 'MF' denotes the 8-lead DFN package. Confirm the 'T' indicates tape and reel packaging if required for automated assembly. Ensure compatibility with the system's SPI voltage levels and check for any recent Product Change Notifications affecting the component.

Selection Notes

Select this part when an extended industrial temperature range is mandatory compared to the industrial-only variant. The 25LC128 requires a minimum supply voltage of 2.5V, unlike the 25AA128 which supports 1.8V. Choose the DFN package for compact board space requirements. Verify that the application does not require lower voltage operation below 2.5V.

Part Context

This component belongs to the 25XX128 family of 128 Kbit SPI EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in voltage and temperature specifications. The family offers various package options including SOIC, TSSOP, and PDIP, providing flexibility for different PCB layout constraints and manufacturing processes.

Replacement Considerations

25LC128-I/MF

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence without resetting the sequence. It must be held low while SCK is low to pause communication, tri-stating the SO line until released.

What is the purpose of the Write Protect (WP) pin?

The WP pin works with the WPEN bit in the STATUS register to prohibit writes to the nonvolatile bits in the STATUS register. When WP is low and WPEN is high, writing to the STATUS register is disabled, though array writes may still occur depending on block protection settings.

Can the device operate at 1.8V supply voltage?

No, the 25LC128 series has a minimum supply voltage of 2.5V. For 1.8V operation, the 25AA128 variant should be selected instead.