Microchip Technology 25LC080BT-I/SN

Overview

25LC080BT-I/SN from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page write capability, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports up to 10 MHz clock frequency, and delivers 1,000,000 erase/write cycles with >200 years data retention - used for firmware storage, calibration data logging, and configuration memory in embedded control systems.

For engineers reviewing the 25LC080BT-I/SN datasheet, 25LC080BT-I/SN pinout, 25LC080BT-I/SN application, or 25LC080BT-I/SN equivalent, key selection considerations include its SOIC-8 (SN) package, hardware write-protection via WP pin, HOLD functionality for SPI bus arbitration, and compatibility with PIC® and other SPI-capable microcontrollers.

Technical Context

The 25LC080BT-I/SN implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and optional HOLD/WP signals. Its internal architecture includes a 32-byte page latch, status register with WIP/WEL/BP bits, and high-voltage generator for EEPROM 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 boundary (000h–01Fh, 020h–03Fh, etc.). The device enters low-power standby when CS is high and supports automatic self-timed write/erase cycles completing in ≤5 ms.

Key Specifications

Pinout & Package

25LC080BT-I/SN is housed in an 8-lead SOIC package (SN), 3.90 mm body width, RoHS-compliant and Pb-free. Pin 1 is marked with a notch or dot; leads are gull-wing, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080BT-I/SN, the PDIP variant offers mechanical robustness and ease of handling, while the AT25080B lacks HOLD support and has divergent write-protection implementation - making 25LC080BT-I/SN preferable for interrupt-driven or multi-peripheral SPI systems.

Availability

25LC080BT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for 25LC080BT-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080B family was designed specifically for reliable, low-power nonvolatile data storage in cost-sensitive embedded systems requiring SPI interface simplicity and industrial-grade endurance.

FAQ

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

The 25LC080BT-I/SN supports up to 10 MHz SPI clock frequency when VCC is 4.5V to 5.5V. At 2.5V to <4.5V, the maximum clock drops to 5 MHz, and at 1.8V to <2.5V it is 3 MHz - though the 25LC080BT-I/SN is not rated for 1.8V operation. These limits ensure setup/hold timing compliance per DS21808D AC characteristics.

Does the 25LC080BT-I/SN support page write operations, and what is the page size?

Yes, the 25LC080BT-I/SN supports page write operations with a fixed 32-byte page size - confirmed in the Device Selection Table and functional description. Page writes allow up to 32 bytes to be loaded before triggering the internal 5 ms write cycle, improving efficiency over byte-wise writes.

How does hardware write protection work on the 25LC080BT-I/SN?

Hardware write protection on the 25LC080BT-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 enabled, this blocks writes to the Status Register only - memory array writes remain permitted unless blocked by BP bits.

What is the purpose of the HOLD pin on the 25LC080BT-I/SN?

The HOLD pin on the 25LC080BT-I/SN pauses ongoing SPI communication without resetting the transaction state. When asserted low (with SCK low), it places SI, SCK, and SO in high-impedance and ignores input transitions - allowing the host MCU to service urgent interrupts and resume seamlessly.

Is the 25LC080BT-I/SN compatible with standard SPI Mode 0,0?

Yes, the 25LC080BT-I/SN is fully compatible with SPI Mode 0,0: CPOL = 0 (clock idle low) and CPHA = 0 (data sampled on first clock edge, i.e., rising SCK). This is explicitly defined in the Functional Description section and verified by timing diagrams for READ, WRITE, and RDSR sequences.