Microchip Technology 25LC080B-I/ST

Overview

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

For engineers reviewing the 25LC080B-I/ST datasheet, 25LC080B-I/ST pinout, 25LC080B-I/ST application, or 25LC080B-I/ST equivalent, key selection criteria include page size (32 bytes), write cycle time (≤5 ms), endurance (1,000,000 cycles), data retention (>200 years), and TSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The 25LC080B-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with dedicated CS, SCK, SI, SO, WP, and HOLD pins. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and hardware block protection enabling selective write-protection of 0%, 25%, 50%, or 100% of memory array.

It supports sequential read, byte/page write, and hold-mode suspension of ongoing SPI transfers without sequence restart. Write operations require explicit WREN instruction and CS high transition to initiate self-timed internal erase/write cycles, with automatic WEL reset upon completion.

Key Specifications

Pinout & Package

25LC080B-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), optimized for automated surface-mount assembly and high-density PCB layouts. Pin 1 is marked by a beveled corner or dot; leads are Pb-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080B-I/ST and AT25080B-SSHL-T, the 25LC080B-I/ST delivers optimal balance of industrial temperature assurance, HOLD pin support for interrupt-safe operation, and flexible hardware/software write protection - making it preferred for robust industrial control and medical instrumentation designs.

Availability

25LC080B-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 25LC080B-I/ST 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080B-I/ST belongs to Microchip's 25XX080A/B serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems operating across extended industrial temperature ranges.

FAQ

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

The 25LC080B-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5V to 5.5V. At lower supply voltages (2.5V ≤ VCC < 4.5V), the maximum clock drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V, it is limited to 3 MHz. These deratings ensure timing compliance across the full industrial temperature range of –40°C to +85°C. The 25LC080B-I/ST datasheet specifies AC characteristics including setup/hold times that scale with VCC level.

Does the 25LC080B-I/ST support page write operations, and what is the page size?

Yes, the 25LC080B-I/ST supports page write operations with a fixed 32-byte page size - distinguishing it from the 'A' version (16-byte page). A single page write can program up to 32 contiguous bytes within the same physical page boundary. Attempting to cross a page boundary causes wraparound to the start of the current page, so application firmware must enforce alignment. This behavior is explicitly documented in the 25LC080B-I/ST functional description.

How does the HOLD pin function on the 25LC080B-I/ST, and what are its timing requirements?

The HOLD pin on the 25LC080B-I/ST suspends ongoing SPI communication without resetting the sequence. To activate HOLD, the pin must be pulled low while SCK is low; transitions during SCK high are ignored until the next high-to-low edge. Resuming requires bringing HOLD high while SCK remains low. During HOLD, SI, SCK, and SO enter high-impedance states. Minimum HOLD setup/hold times are 20–80 ns depending on VCC, per DS21808D AC characteristics table.

What write protection mechanisms does the 25LC080B-I/ST provide?

The 25LC080B-I/ST provides three layered write protection: (1) software-controlled block protection (BP0/BP1 bits) enabling 0%, 25%, 50%, or 100% array lock; (2) hardware write-protect via WP pin when WPEN bit is set; and (3) write-enable latch (WEL) requiring explicit WREN instruction before any write. These features operate independently - for example, WP pin only affects Status Register writes when WPEN=1, leaving memory writes unaffected unless BP bits are also set.

Is the 25LC080B-I/ST pin-compatible with other 8-pin SPI EEPROMs like the 25AA080B-I/ST?

Yes, the 25LC080B-I/ST is pin-compatible with the 25AA080B-I/ST in the same TSSOP-8 package (ST suffix), sharing identical pinout, footprint, and SPI interface signals (CS, SO, WP, VSS, SI, SCK, HOLD, VCC). Both devices support 32-byte page writes and share the same functional instruction set. However, the 25LC080B-I/ST has a narrower VCC range (2.5–5.5V vs. 1.8–5.5V) and different temperature grading - differences that must be verified in system-level electrical design.