Microchip Technology AT25010B-XHL-B

Overview

AT25010B-XHL-B from Microchip Technology is a 1 Kbit (128 × 8) SPI Serial EEPROM IC designed for nonvolatile data storage in embedded control and system configuration circuits. It operates from 1.8V to 5.5V, supports 20 MHz clock rate at 5V, features hardware write protection via WP pin, and delivers 1,000,000 write cycles with 100-year data retention - deployed in industrial sensor nodes and power management firmware storage.

For engineers reviewing the AT25010B-XHL-B datasheet, AT25010B-XHL-B pinout, AT25010B-XHL-B application, or AT25010B-XHL-B equivalent, key selection criteria include SPI Mode 0/3 compatibility, 8-byte page write capability, block-level write protection (1/4, 1/2, or full array), HOLD pin support for transaction suspension, and industrial temperature range (-40°C to +85°C) operation.

Technical Context

The AT25010B-XHL-B implements a synchronous SPI slave interface with fixed MSB-first data framing, rising-edge input sampling on SI, and falling-edge output latching on SO. Its internal architecture includes a STATUS register with BP1/BP0 bits enabling configurable block write protection, a Write Enable Latch (WEL), and RDY/BSY flag for polling-based write completion detection.

It integrates a high-voltage generation circuit for EEPROM cell programming, power-on reset (POR) logic ensuring safe initialization, and independent HOLD and WP pins that operate asynchronously to SCK - allowing real-time suspension of serial transfers and hardware-enforced write inhibition without software intervention.

Key Specifications

Pinout & Package

AT25010B-XHL-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard JEDEC MS-012AC footprint and 1.27 mm pitch. This surface-mount package supports automated assembly and provides mechanical robustness for board-level reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95010-WMN6TP and BR24G01NUX-10, the AT25010B-XHL-B uniquely combines HOLD pin support, standardized BP1/BP0 block protection semantics, and Microchip's industrial qualification - making it optimal for designs requiring transaction suspension and consistent firmware portability across Microchip-based platforms.

Availability

AT25010B-XHL-B is available at Aetrix Electronics and suitable for industrial sensor calibration storage, microcontroller boot configuration, and power supply fault logging requiring stable component supply across multi-year production cycles.

Supply support for AT25010B-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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on industrial, automotive, and communications markets.

The AT25010B-XHL-B belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, engineered for low-power, low-voltage embedded systems requiring reliable nonvolatile storage with minimal pin count and board space.

FAQ

What is the memory organization of the AT25010B-XHL-B?

The AT25010B-XHL-B contains 1,024 bits of EEPROM memory organized as 128 words × 8 bits. This structure supports byte-addressable reads and writes, with address space ranging from 0x00 to 0x7F. The device uses a single 8-bit instruction register and requires MSB-first data framing on the SI pin. Each WRITE command targets one byte unless operating in page write mode, which allows up to eight sequential bytes to be written in a single transaction.

Does the AT25010B-XHL-B support SPI Mode 3, and how does it differ from Mode 0?

Yes, the AT25010B-XHL-B supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). In both modes, data is sampled on the rising edge of SCK and output on the falling edge. The key difference lies in the idle state of SCK: in Mode 0, SCK is low when CS is inactive; in Mode 3, SCK is high. The AT25010B-XHL-B requires matching SCK polarity before and after each CS assertion to avoid communication errors.

How does the HOLD pin function during an active write cycle in the AT25010B-XHL-B?

The HOLD pin has no effect on an ongoing internal write cycle in the AT25010B-XHL-B. Once a WRITE command is issued and the internal self-timed programming begins, asserting HOLD will not pause or abort the operation. HOLD only suspends serial communication - such as instruction or address transfers - and places SO in high-impedance state. The write cycle continues to completion (≤5 ms), after which the RDY/BSY bit clears and the device resumes normal SPI responsiveness.

What is the role of the WP pin versus software write protection in the AT25010B-XHL-B?

In the AT25010B-XHL-B, the WP pin provides hardware-level write inhibition: pulling WP low disables all WRITE, WRSR, and WREN commands regardless of STATUS register state. Software protection uses the STATUS register's BP1/BP0 bits to lock specific memory blocks and the WEL bit to gate write access. WP overrides software settings - if WP is low, no write operation proceeds even if WEL=1 and BP bits permit it - offering fail-safe protection against firmware bugs or malware.

Can the AT25010B-XHL-B be used in a 1.8V-only system without level shifters?

Yes, the AT25010B-XHL-B is fully specified for 1.8V operation across all electrical parameters, including DC characteristics (e.g., VOL2 ≤ 0.2V at IOL = 0.15 mA), AC timing (e.g., fSCK ≥ 5 MHz), and input thresholds (VIH ≥ 1.26V, VIL ≤ 0.54V). Its 1.8–5.5V supply range and guaranteed 1.8V-compatible signaling eliminate the need for external level shifters when interfacing with 1.8V microcontrollers or FPGAs.