Microchip Technology 25LC080B-I/P

Overview

25LC080B-I/P 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–5.5V and features hardware write protection via WP pin and status register control, used for firmware storage and configuration retention in embedded microcontroller systems.

For engineers reviewing the 25LC080B-I/P datasheet, 25LC080B-I/P pinout, 25LC080B-I/P application, or 25LC080B-I/P equivalent, key selection criteria include page size (32 bytes), VCC range (2.5–5.5 V), endurance (1M cycles), data retention (>200 years), and SPI timing compliance at 10 MHz under industrial conditions.

Technical Context

The 25LC080B-I/P implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and HOLD pin for transaction suspension without reset. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming.

Write operations require explicit WREN instruction before WRITE or WRSR commands; the write enable latch resets after power-up, WRDI, WRSR, or successful WRITE. Block protection is configurable via BP0/BP1 bits to lock 0%, 25%, 50%, or 100% of the 0000h–03FFh address space, with hardware write-protection enabled only when WP = low and WPEN = 1.

Key Specifications

Pinout & Package

25LC080B-I/P is packaged in 8-lead PDIP (Plastic Dual In-Line Package), 300 mil body width, with through-hole mounting and industry-standard pin layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080B-I/P, the 25LC080B-I/SN offers identical functionality in a compact SOIC package for density-sensitive designs, while the AT25080B-SSHL-T provides second-source assurance with matching electrical behavior and industrial temperature support.

Availability

25LC080B-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded firmware backup, and motor drive configuration requiring stable component supply across extended production lifecycles.

Supply support for 25LC080B-I/P 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions.

The 25LC080B-I/P belongs to Microchip's 25XX080A/B serial EEPROM product line, designed for reliable, low-power, SPI-based configuration and data storage in industrial and embedded systems.

FAQ

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

The 25LC080B-I/P supports up to 10 MHz SPI clock frequency when VCC is 4.5 V to 5.5 V. At lower supply voltages (2.5 V ≤ VCC < 4.5 V), the maximum clock drops to 5 MHz. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing across industrial temperature ranges.

Does the 25LC080B-I/P require external pull-up resistors on its SPI lines?

The 25LC080B-I/P does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS and WP are active-low inputs with internal weak pull-ups disabled by default; external pull-ups are recommended on CS for noise immunity and on WP if hardware protection is not always enabled. HOLD also benefits from a 10 kΩ pull-up to VCC.

How does page write operation work in the 25LC080B-I/P?

In the 25LC080B-I/P, a page write allows up to 32 consecutive bytes to be loaded into the page latch before initiating the internal 5 ms write cycle. All bytes must reside within the same 32-byte physical page (e.g., addresses 0000h–001Fh); crossing a boundary causes wraparound, overwriting earlier bytes in the page - software must enforce page alignment.

What happens to the write enable latch after power-up of the 25LC080B-I/P?

Upon power-up, the 25LC080B-I/P initializes with the write enable latch (WEL) reset to '0', disabling all write operations. A WREN instruction must be issued and confirmed (via RDSR) before any WRITE or WRSR command will be accepted. This prevents accidental writes during power ramp-up or brownout conditions.

Can the 25LC080B-I/P be used in automotive applications?

The 25LC080B-I/P is rated for Industrial temperature range (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip specifies the 25LC080B-E/P variant - identical functionality but qualified to AEC-Q100 Grade 3. Using 25LC080B-I/P in under-hood environments may risk parametric drift or premature failure outside its validated thermal envelope.