Microchip Technology 25LC080B-I/SN

Overview

25LC080B-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page write capability, and 2.5–5.5 V supply range. It operates across industrial temperature (−40°C to +85°C) and supports up to 10 MHz clock frequency. Used for nonvolatile parameter storage in microcontroller-based embedded systems requiring reliable, low-power data retention.

For engineers reviewing the 25LC080B-I/SN datasheet, 25LC080B-I/SN pinout, 25LC080B-I/SN application, or 25LC080B-I/SN equivalent, key selection criteria include page size (32 bytes), write cycle time (≤5 ms), hardware write protection via WP pin and BP bits, HOLD functionality for SPI bus arbitration, and SOIC-8 (SN) package compatibility with standard PCB footprints.

Technical Context

The 25LC080B-I/SN implements a standard SPI Mode 0,0/Motorola-compatible interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and SCK-synchronized transfers. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits enabling configurable block protection and write-enable control.

It features self-timed erase/write cycles, power-on reset of the write enable latch, and hardware-level data protection via WP pin interaction with the WPEN bit. The HOLD pin suspends ongoing serial communication without resetting the sequence, allowing host MCU interrupt servicing while preserving transaction state.

Key Specifications

Pinout & Package

25LC080B-I/SN is packaged in an 8-lead SOIC (SN) body, 3.90 mm wide, with standard 1.27 mm pitch and RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 25AA080B-I/SN and AT25080B-SSHL-T, the 25LC080B-I/SN offers guaranteed industrial temperature operation and native Microchip PIC MCU compatibility, while avoiding 1.8 V support trade-offs or third-party command set divergence.

Availability

25LC080B-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and smart energy meter firmware settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 25LC080B-I/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080B-I/SN belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, designed specifically for cost-sensitive, space-constrained embedded systems needing robust nonvolatile storage with minimal external components and proven interoperability with PIC and dsPIC microcontrollers.

FAQ

What is the maximum clock frequency supported by the 25LC080B-I/SN?

The 25LC080B-I/SN supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V. At 2.5–4.5 V, the maximum clock drops to 5 MHz, and at 1.8–2.5 V it is 3 MHz - though the 25LC080B-I/SN is not rated for operation below 2.5 V. These limits ensure setup/hold timing compliance per AC characteristics in DS21808D.

How does the 32-byte page size affect write operations in the 25LC080B-I/SN?

The 32-byte page size in the 25LC080B-I/SN means that up to 32 consecutive bytes can be written in a single page write command, provided they reside entirely within one physical page (addresses 000h–01Fh, 020h–03Fh, etc.). Crossing a page boundary causes wraparound, overwriting earlier bytes in the same page - so firmware must enforce page-aligned writes or split cross-boundary transfers.

Can the 25LC080B-I/SN be used in automotive applications?

The 25LC080B-I/SN is specified for Industrial temperature range (−40°C to +85°C). While the 'E'-temp variant 25LC080B-E/SN supports −40°C to +125°C for automotive use, the 25LC080B-I/SN is not qualified for under-hood automotive applications. For dashboard or body-control modules within industrial ambient limits, it remains suitable with proper thermal design.

What is the function of the HOLD pin on the 25LC080B-I/SN?

The HOLD pin on the 25LC080B-I/SN pauses ongoing SPI communication without resetting the transaction. When pulled low (with SCK low), it tri-states SO and ignores SI/SCK transitions, allowing the host MCU to service urgent interrupts. Resuming requires bringing HOLD high while SCK remains low - preserving full command/state context for seamless continuation.

How is hardware write protection implemented on the 25LC080B-I/SN?

Hardware write protection on the 25LC080B-I/SN requires both the WPEN bit (bit 7 of Status Register) to be set to '1' and the WP pin (Pin 3) held low. When active, this combination blocks writes to the Status Register only - memory array writes remain enabled. If WP is high or WPEN is low, all writes (array and Status Register) are permitted, providing flexible, software-controllable protection granularity.