Microchip Technology 25LC080BT-I/ST

Overview

25LC080BT-I/ST from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page size, 2.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features hardware write protection via WP pin, HOLD suspend functionality, and self-timed 5 ms max write cycles - deployed in embedded control systems for firmware parameter storage and calibration data retention.

For engineers reviewing the 25LC080BT-I/ST datasheet, 25LC080BT-I/ST pinout, 25LC080BT-I/ST application, or 25LC080BT-I/ST equivalent, key selection criteria include SPI interface timing compliance at 10 MHz, page-write boundary handling, block protection granularity (1/4, 1/2, or full array), and TSSOP-8 package suitability for space-constrained PCB layouts.

Technical Context

The 25LC080BT-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, requiring CS assertion, SCK synchronization, and optional HOLD suspension. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and high-voltage generator for EEPROM cell programming.

Write operations require explicit WREN instruction followed by WRITE command and address; page writes are limited to 32 bytes within a single physical page (0x000–0x01F, 0x020–0x03F, etc.), with wraparound behavior on boundary violation. Block protection is controlled nonvolatily via BP0/BP1 bits and enabled only when WPEN=1 and WP pin is low.

Key Specifications

Pinout & Package

25LC080BT-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), optimized for automated assembly and thermal performance in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080AT-I/ST, the 25LC080BT-I/ST offers larger 32-byte pages for faster bulk writes, while AT25080B-SSHL-T trades HOLD and WP pins for lower unit cost in fixed-function applications where interrupt latency and physical write disable are noncritical.

Availability

25LC080BT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive ECU bootloader settings, and smart meter firmware metadata requiring stable component supply across extended product lifecycles.

Supply support for 25LC080BT-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 25LC080BT-I/ST belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, engineered for robust, low-power nonvolatile storage in resource-constrained embedded systems demanding high endurance and long-term data integrity.

FAQ

What is the maximum SPI clock frequency supported by the 25LC080BT-I/ST?

The 25LC080BT-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V, 5 MHz at 2.5–4.5 V, and 3 MHz at 1.8–2.5 V. These limits ensure reliable setup/hold timing for SI/SO signals and are validated across the full industrial temperature range (–40°C to +85°C). The 25LC080BT-I/ST datasheet specifies AC characteristics including TCSS, TCSH, and Tsu to guide PCB layout and firmware timing margins.

Does the 25LC080BT-I/ST require external pull-up resistors on its SPI lines?

No, the 25LC080BT-I/ST does not require external pull-up resistors on SI, SO, SCK, or CS lines - all inputs have internal weak pull-downs, and SO is actively driven or tri-stated. However, a 10 kΩ pull-up on the WP pin is recommended if hardware write protection is not used, ensuring predictable default state during power-up. The 25LC080BT-I/ST specification confirms VIH/VIL thresholds are met with standard CMOS logic levels.

How does page write operation work in the 25LC080BT-I/ST?

A page write in the 25LC080BT-I/ST allows up to 32 consecutive bytes to be loaded into the page buffer before triggering an internal 5 ms write cycle. All bytes must reside within the same 32-byte physical page (e.g., addresses 0x000–0x01F); crossing a boundary causes wraparound to the page start. The 25LC080BT-I/ST status register WIP bit must be polled to confirm completion before initiating subsequent operations.

Can the 25LC080BT-I/ST be used in automotive applications?

The 25LC080BT-I/ST is rated for industrial temperature (–40°C to +85°C) and is not qualified for automotive AEC-Q100 Grade 1 (–40°C to +125°C). For automotive use, Microchip offers the 25LC080B-E/ST variant with extended temperature support. The 25LC080BT-I/ST may be deployed in under-hood-adjacent modules only with full thermal derating and validation - its specifications do not cover operation above +85°C.

What happens if the HOLD pin is asserted during a write cycle in the 25LC080BT-I/ST?

Asserting HOLD during an active write cycle in the 25LC080BT-I/ST has no effect on the ongoing internal programming - the write proceeds to completion. HOLD only suspends SPI communication (SI/SO/SCK sampling) during read or write command sequences prior to write initiation. Once the internal write cycle begins (after CS goes high), the 25LC080BT-I/ST ignores HOLD state changes until the next command sequence starts.