25LC128-H/SN

Overview

The Microchip Technology 25LC128-H/SN is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM (EEPROM) housed in an 8-lead SOIC package. It supports the SPI compatible serial bus architecture with a maximum clock frequency of 5 MHz at VCC levels between 4.5V and 5.5V, or 3 MHz at 2.5V to 4.5V. The device operates within an extended temperature range of -40°C to +150°C and utilizes low-power CMOS technology.

Feature Summary

• Supports block-level write protection for none, one-quarter, one-half, or all memory segments via status register configuration.
• Includes built-in power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Features a hold pin that allows suspension of serial communication without resetting the sequence.

Applications

• Microcontroller systems requiring non-volatile storage for calibration data
• Industrial control applications operating in high-temperature environments
• Automotive electronics requiring AEC-Q100 qualified components

Procurement Notes

Verify the specific suffix 'H' confirms the extended temperature grade (-40°C to +150°C) and 'SN' indicates the 8-lead SOIC package. Confirm RoHS compliance and automotive qualification status if required by the design specification. Ensure voltage supply ranges match the operational requirements for the selected clock speed.

Selection Notes

Select this component when high-temperature reliability is critical, as it supports operation up to +150°C. Choose this part over standard industrial grades if the application environment exceeds typical limits. Verify that the 5 MHz maximum clock speed meets the system's data throughput requirements.

Part Context

This device belongs to the 25LCXXX family of mid-density serial EEPROMs from Microchip Technology. It shares architectural similarities with other densities in the series but offers specific 128 Kbit capacity. The H suffix denotes the extended temperature variant, distinguishing it from standard industrial temperature parts.

Replacement Considerations

Direct replacements include other 25LC128 variants with matching temperature grades and packages, such as 25LC128-I/SN for lower temperature requirements. Cross-vendor equivalents must be verified against SPI protocol compatibility and voltage specifications.

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. SI, SCK, and SO pins enter a high-impedance state during this pause.

What is the internal write cycle time for this device?

The internal write cycle time is a maximum of 6 ms, initiated on the rising edge of CS after a valid write sequence.