Microchip Technology 25LC080BT-I/MSG

Overview

25LC080BT-I/MSG 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 functionality for interrupt-safe bus suspension, 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/MSG datasheet, 25LC080BT-I/MSG pinout, 25LC080BT-I/MSG application, or 25LC080BT-I/MSG equivalent, key selection criteria include SPI clock compatibility up to 10 MHz at 5.5 V, page-write boundary handling, WPEN-controlled hardware write protection, and MSOP-8 package suitability for space-constrained PCB layouts.

Technical Context

The 25LC080BT-I/MSG 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/HPIN suspension. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits enabling nonvolatile block protection of 0%, 25%, 50%, or 100% of memory.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal erase/write; read operations support sequential addressing with automatic rollover from address 03FFh to 0000h. The device powers up with WEL reset and SO in high-impedance state, ensuring safe default behavior on power-on reset.

Key Specifications

Pinout & Package

25LC080BT-I/MSG is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, 3.00 mm × 4.90 mm body, and Pb-free/RoHS-compliant construction. This compact surface-mount package supports automated assembly and thermal performance suitable for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080AT-I/MSG, the 25LC080BT-I/MSG offers double the page size for more efficient bulk writes; versus AT25080B-MAHL-T, it retains HOLD functionality essential for deterministic real-time interrupt handling in safety-critical systems.

Availability

25LC080BT-I/MSG is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term data integrity, and RoHS-compliant packaging.

Supply support for 25LC080BT-I/MSG 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 infrastructure.

The 25LCxxxB series targets cost-sensitive, space-constrained embedded systems needing reliable, low-power serial EEPROM with robust SPI interoperability and configurable hardware protection.

FAQ

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

The 25LC080BT-I/MSG 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 are defined in Table 1-2 of DS21808D and reflect guaranteed AC timing margins under industrial temperature conditions. Operation beyond these frequencies may result in setup/hold violations or data corruption. The 25LC080BT-I/MSG must be configured for correct SPI mode (Mode 0,0) to ensure proper SI sampling and SO timing alignment.

How does the HOLD pin function during an active SPI transaction on the 25LC080BT-I/MSG?

The HOLD pin on the 25LC080BT-I/MSG suspends ongoing SPI communication when pulled low while SCK is low, preserving the internal state without resetting the command sequence. During HOLD, SI, SCK, and SO enter high-impedance states and ignore transitions except CS. Resuming requires bringing HOLD high while SCK remains low. This allows host microcontrollers to service urgent interrupts without losing transaction context. The 25LC080BT-I/MSG specification guarantees THH (HOLD hold time) and THZ (output disable delay) timing per Table 1-3.

Can the 25LC080BT-I/MSG be used with a 1.8 V supply voltage?

No, the 25LC080BT-I/MSG is rated for 2.5–5.5 V operation only. Devices with 1.8 V support carry the "AA" prefix (e.g., 25AA080B). Attempting to operate the 25LC080BT-I/MSG below 2.5 V risks unreliable SPI communication, incomplete write cycles, or failure to set the write-enable latch. The DC characteristics table (D001–D004) explicitly defines VIH/VIL thresholds for VCC ≥ 2.7 V and VCC < 2.7 V, confirming 2.5 V as the absolute minimum validated supply.

What memory protection mechanisms are implemented in the 25LC080BT-I/MSG?

The 25LC080BT-I/MSG implements three layered protections: (1) Block Protection (BP0/BP1 bits) to lock 0%, 25%, 50%, or 100% of memory; (2) Hardware Write Protection using WP pin + WPEN bit to disable Status Register writes; and (3) Power-on reset of the write-enable latch. These features prevent accidental or malicious overwrites of critical data. The 25LC080BT-I/MSG also includes built-in power-on/off data protection circuitry and a write-enable latch that resets after every successful WRITE or WRSR command.

Is the 25LC080BT-I/MSG pin-compatible with other 8-pin SPI EEPROMs in MSOP packages?

The 25LC080BT-I/MSG uses standard SPI pin assignments (CS, SO, WP, VSS, SI, SCK, HOLD, VCC) in MSOP-8, matching industry conventions. However, pin compatibility with other vendors' devices (e.g., ST, ON Semi) is not guaranteed due to differences in HOLD/WP functionality, status register bit definitions, or timing tolerances. For example, AT25080B lacks HOLD, and CAT25080 has different write-protection encoding. Always verify functional equivalence and AC timing against target system requirements before substitution. The 25LC080BT-I/MSG datasheet confirms its pinout conforms to Microchip's 25XX080A/B family standard.