Microchip Technology AT25080B-WWU11L

Overview

AT25080B-WWU11L from Microchip Technology is an 8 Kbit SPI Serial EEPROM (1,024 × 8) in an 8-pad UDFN 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, and hardware/software write protection for industrial applications including embedded control configuration storage.

For engineers reviewing the AT25080B-WWU11L datasheet, AT25080B-WWU11L pinout, AT25080B-WWU11L application, or AT25080B-WWU11L equivalent, key selection considerations include low-voltage operation down to 1.8V, 100-year data retention, 1M write endurance, block-level write protection (1/4, 1/2, or full array), and HOLD/CS-controlled serial suspend capability.

Technical Context

The AT25080B-WWU11L implements a synchronous SPI slave interface with fixed MSB-first framing, rising-edge input sampling on SI and falling-edge output shifting on SO. Its internal architecture includes a dedicated STATUS register controlling WPEN, BP1/BP0 block protection bits, and WEL latch-enabling granular hardware- and software-based write lockout independent of VCC level.

It features dual-layer write protection: a dedicated WP pin (active-low, conditional on WPEN bit) and software-configurable block protection bits, plus a HOLD pin that suspends ongoing serial transfers without resetting internal state-critical for multi-master arbitration or real-time system interrupt handling while preserving command context.

Key Specifications

Pinout & Package

AT25080B-WWU11L is packaged in an 8-pad UDFN (2.0 mm × 3.0 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.

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/MS, the AT25080B-WWU11L offers optimal balance of industrial temperature compliance, compact UDFN packaging, and 20 MHz performance at 5V-making it preferred for high-density, cost-sensitive industrial controllers where board space and throughput are constrained.

Availability

AT25080B-WWU11L is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart energy meters, automotive body control modules, and IoT edge gateways requiring stable component supply across multi-year production cycles.

Supply support for AT25080B-WWU11L 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, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and software platforms.

The AT25080B-WWU11L belongs to Microchip's AT25xxx SPI Serial EEPROM product line, engineered for reliable, low-power nonvolatile data storage in resource-constrained embedded systems where deterministic write timing and long-term data integrity are critical.

FAQ

What is the maximum clock frequency supported by the AT25080B-WWU11L at 3.3V operation?

The AT25080B-WWU11L supports up to 10 MHz SPI clock frequency when operated at VCC = 2.5V to 5.5V, which includes 3.3V. This is specified in Table 4-3 of the DS20006244A datasheet. At 1.8V, the maximum clock drops to 5 MHz. The 20 MHz rating applies only at 4.5–5.5V. Designers must select clock rates based on actual VCC to ensure AC timing compliance.

Does the AT25080B-WWU11L require external circuitry for power-on reset handling?

No, the AT25080B-WWU11L integrates an internal Power-on Reset (POR) circuit that holds the device in reset until VCC crosses the VPOR threshold (~1.5V) and stabilizes. Per Section 4.6.1.1, the host must wait ≥100 µs after VCC stabilization before issuing the first command. No external reset IC or RC network is needed, simplifying system design and reducing BOM cost.

How does write protection work on the AT25080B-WWU11L, and can it be overridden?

Write protection on the AT25080B-WWU11L uses two independent mechanisms: (1) hardware via the WP pin (active-low, effective only when WPEN=1 in STATUS register), and (2) software via BP1/BP0 bits enabling 1/4, 1/2, or full-array lock. WPEN itself is nonvolatile and can be cleared via WRSR command only when WEL=1-so protection can be disabled in-system if required, but never accidentally.

Is the AT25080B-WWU11L pin-compatible with other members of the AT25xxx family, such as AT25160B?

Yes, the AT25080B-WWU11L shares identical pinout, package dimensions, and command set with AT25160B and other AT25xxx variants in the same package type (e.g., UDFN). They differ only in memory density (8 Kbit vs. 16 Kbit) and internal addressing-allowing drop-in replacement in designs where capacity headroom exists, provided firmware handles the larger address space correctly.

What is the purpose of the HOLD pin on the AT25080B-WWU11L, and when should it be used?

The HOLD pin on the AT25080B-WWU11L suspends ongoing SPI communication without resetting internal state-useful when the host MCU must service a higher-priority interrupt (e.g., CAN message or ADC trigger) mid-transfer. It must be asserted low during SCK low time and deasserted low during SCK low to resume. HOLD has no effect on active write cycles, which complete autonomously.