Microchip Technology AT25080B-XHL-B

Overview

AT25080B-XHL-B from Microchip Technology is an 8 Kbit SPI Serial EEPROM (1,024 × 8) in an 8-lead XDFN package, supporting SPI Modes 0 and 3, operating from 1.8V to 5.5V, with 20 MHz max clock rate at 5V, 32-byte page write capability, and industrial temperature range (−40°C to +85°C). It serves as nonvolatile configuration storage in microcontroller-based embedded systems requiring low-voltage, high-reliability data retention.

For engineers reviewing the AT25080B-XHL-B datasheet, AT25080B-XHL-B pinout, AT25080B-XHL-B application, or AT25080B-XHL-B equivalent, key selection considerations include its 1.8V–5.5V supply range, hardware/software write protection via WP pin and STATUS register, 5 ms max self-timed write cycle, 1M endurance, and 100-year data retention - critical for firmware parameter storage, calibration data logging, and secure boot configuration in space-constrained industrial designs.

Technical Context

The AT25080B-XHL-B implements a synchronous SPI slave interface with fixed MSB-first serial protocol, where SI latches on SCK rising edge and SO drives on SCK falling edge. Its internal architecture includes a high-voltage generation circuit for EEPROM programming, address register/counter, and dedicated write protection control logic tied to the nonvolatile STATUS register (WPEN, BP1, BP0 bits).

It supports dual-layer data protection: hardware-level write inhibition via the WP pin (when WPEN = 1), and software-controlled block protection (1/4, 1/2, or full array) through STATUS register configuration. The HOLD pin enables mid-transaction suspension without resetting the SPI sequence, provided SCK is low during assertion/deassertion.

Key Specifications

Pinout & Package

AT25080B-XHL-B is housed in an 8-pad XDFN (eXposed Dual Flat No-lead) package, measuring 2.0 mm × 1.6 mm × 0.55 mm, with wettable flank side walls for automated optical inspection (AOI) and enhanced solder joint reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95080-DRMN6TP/K and 25AA080C-I/MNY, the AT25080B-XHL-B delivers superior low-power operation (10 µA standby), full industrial temperature support, and unique HOLD functionality - making it the optimal choice for thermally demanding, energy-sensitive, and real-time-interrupt-capable embedded systems.

Availability

AT25080B-XHL-B is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, automotive body control modules, and smart energy meters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT25080B-XHL-B 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The AT25080B-XHL-B belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, designed specifically for reliable, low-voltage nonvolatile storage in space-constrained, mission-critical embedded systems across industrial, automotive, and medical markets.

FAQ

What is the maximum clock frequency supported by the AT25080B-XHL-B at 1.8V?

The AT25080B-XHL-B supports a maximum SCK frequency of 5 MHz when operating at VCC = 1.8V to 5.5V, as specified in Table 4-3 of the DS20006244A datasheet. This ensures robust timing margins under low-voltage conditions while maintaining compatibility with ultra-low-power microcontrollers.

Does the AT25080B-XHL-B require external pull-up resistors on its I/O pins?

The AT25080B-XHL-B does not require external pull-ups on SI, SO, or SCK - these are driven actively by the host and device. However, a pull-up resistor (≤10 kΩ) on the CS pin is strongly recommended to ensure proper power-up behavior and prevent spurious writes, as stated in Section 2.1 of the datasheet.

How does the HOLD pin function during an active write cycle in the AT25080B-XHL-B?

The HOLD pin has no effect on an ongoing internal write cycle in the AT25080B-XHL-B; it only suspends serial communication (SI/SO/SCK interaction). As confirmed in Section 5.3, if a WRITE instruction has already initiated the self-timed 5 ms programming, asserting HOLD will pause data transfer but not halt the EEPROM cell programming itself.

What is the default state of the STATUS register after power-up for the AT25080B-XHL-B?

Upon power-up, the AT25080B-XHL-B defaults to Standby mode with WEL = 0 (write disabled), Ready/Busy = 0 (ready to accept commands), and nonvolatile bits (WPEN, BP1, BP0) retaining their last written values. The EEPROM array ships pre-programmed with 0xFFh, as documented in Section 4.6.6 of the datasheet.

Can the AT25080B-XHL-B be used as a direct replacement for the AT25080A-XHL-B?

Yes - the AT25080B-XHL-B is the enhanced revision of the AT25080A-XHL-B, with identical pinout, command set, timing, and electrical specifications. Microchip confirms backward compatibility in the DS20006244A datasheet revision history, making it a drop-in upgrade with improved reliability and qualification.