Microchip Technology 25LC080B-E/ST

Overview

25LC080B-E/ST from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 32-byte page write capability, 10 MHz max clock frequency, and industrial-automotive temperature range (−40°C to +125°C). It operates from 2.5V–5.5V supply and delivers 1,000,000 erase/write cycles with >200-year data retention - used for firmware storage, calibration data logging, and configuration backup in automotive control modules.

For engineers reviewing the 25LC080B-E/ST datasheet, 25LC080B-E/ST pinout, 25LC080B-E/ST application, or 25LC080B-E/ST equivalent, key selection criteria include page size (32 B), HOLD/CS timing margins, VCC voltage compliance (2.5–5.5 V), WPEN-controlled hardware write protection, and TSSOP-8 package compatibility with high-density PCB layouts.

Technical Context

The 25LC080B-E/ST implements a standard SPI Mode 0,0/Motorola-compatible interface with separate SI/SO lines and active-low CS. Its internal architecture includes a 1024 × 8-bit EEPROM array, page latches, HV generator, and status register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN instruction before WRITE or WRSR commands; page writes are bounded to 32-byte physical pages (000h–01Fh, 020h–03Fh, etc.), and crossing boundaries causes wraparound. HOLD pin suspends serial transfer while preserving internal state, enabling interrupt servicing without sequence restart.

Key Specifications

Pinout & Package

25LC080B-E/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and Pb-free, optimized for automated SMT assembly and thermal performance in compact automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080B-I/ST, the 25LC080B-E/ST adds automotive temperature qualification and identical functionality; versus AT25080B-SSHL-T, it provides HOLD pin support and wider 2.5 V VCC headroom - critical for brown-out resilience in automotive 12 V systems.

Availability

25LC080B-E/ST is available at Aetrix Electronics and suitable for automotive control units, ADAS modules, and industrial PLCs requiring stable component supply with long lifecycle assurance.

Supply support for 25LC080B-E/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 25LC080B-E/ST belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, engineered for robust nonvolatile data storage in automotive, industrial, and communications systems demanding high endurance and extended temperature operation.

FAQ

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

The 25LC080B-E/ST supports up to 10 MHz clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum clock drops to 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it is 3 MHz - though the 25LC080B-E/ST is not rated for 1.8 V operation. These limits ensure reliable setup/hold timing for SI/SO signals per DS21808D Table 1-2.

Does the 25LC080B-E/ST have built-in write protection features?

Yes, the 25LC080B-E/ST includes multiple write protection mechanisms: a write-enable latch (WEL) that must be set before any write, a Write-Protect Enable (WPEN) bit controlling hardware lock via the WP pin, and two Block Protection (BP0/BP1) bits enabling selective protection of none, upper 1/4, upper 1/2, or the full 1024-byte array. All protections are implemented in the 25LC080B-E/ST status register and persist through power cycles.

What package type is used for the 25LC080B-E/ST?

The 25LC080B-E/ST uses an 8-lead TSSOP package (4.4 mm body width, 0.65 mm lead pitch), designated by the "ST" suffix. This RoHS-compliant, Pb-free package offers superior thermal dissipation and board space efficiency compared to SOIC or PDIP, making it ideal for automotive and high-density industrial PCBs.

How many erase/write cycles does the 25LC080B-E/ST guarantee?

The 25LC080B-E/ST guarantees 1,000,000 erase/write cycles per memory location, validated per JEDEC standards. This endurance rating applies across its full operating temperature range (−40°C to +125°C) and supports long-term field deployment in applications such as automotive ECU calibration storage and industrial PLC firmware headers.

Can the 25LC080B-E/ST be used with a 3.3 V microcontroller SPI interface?

Yes, the 25LC080B-E/ST operates reliably with 3.3 V microcontrollers: its VCC range is 2.5 V to 5.5 V, and its input thresholds (VIH1 = 2.0 V min, VIL1 = 0.8 V max at VCC ≥ 2.7 V) are fully compatible with standard 3.3 V CMOS logic levels. No level-shifting circuitry is required when interfacing the 25LC080B-E/ST with 3.3 V SPI masters.