Microchip Technology AT25M02-UUM-T

Overview

AT25M02-UUM-T from Microchip Technology is a 2 Mbit SPI Serial EEPROM (262,144 × 8) optimized for low-voltage industrial applications. It operates from 1.7V to 5.5V, supports 5 MHz clock rate at 5V, features 256-byte page write capability, and delivers 1,000,000 write cycles with 100-year data retention - deployed in embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the AT25M02-UUM-T datasheet, AT25M02-UUM-T pinout, AT25M02-UUM-T application, or AT25M02-UUM-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware/software write protection via WP and STATUS register, HOLD pin suspend functionality, industrial temperature range (–40°C to +85°C), and green 8-ball WLCSP packaging.

Technical Context

The AT25M02-UUM-T implements a synchronous SPI slave interface with fixed MSB-first data framing, latching input on SCK rising edge and outputting on falling edge. It supports dual SPI modes (0 and 3) differentiated only by SCK idle polarity, and includes dedicated control logic for CS-driven device selection, HOLD-initiated communication suspension, and WP-gated STATUS register writes when WPEN = 1.

Internally, it integrates a high-voltage generation circuit for EEPROM programming, row/column decoders for 262,144-word addressing, and a status register with nonvolatile BP1/BP0 bits enabling 1/4, 1/2, or full array block protection. Write operations are self-timed with ≤10 ms maximum cycle time and automatic READY/BSY flag assertion.

Key Specifications

Pinout & Package

AT25M02-UUM-T is packaged in an 8-ball Wafer-Level Chip-Scale Package (WLCSP), offering minimal footprint (1.5 mm × 1.5 mm, 0.5 mm pitch) and low profile (<0.5 mm) for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95M02-DFMN6TP and BR25M02FJ-WE2, the AT25M02-UUM-T uniquely combines HOLD pin support, ultra-low standby current, and identical 1.7–5.5V operation - making it optimal for battery-powered, interrupt-sensitive, and wide-input-voltage industrial systems where deterministic SPI pause/resume and energy efficiency are design priorities.

Availability

AT25M02-UUM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware storage requiring stable component supply and long-term lifecycle assurance.

Supply support for AT25M02-UUM-T 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 a focus on robustness, longevity, and industrial-grade qualification.

The AT25M02-UUM-T belongs to Microchip's AT25 family of SPI EEPROMs, engineered specifically for reliable, low-power, and secure nonvolatile data storage in harsh-environment embedded systems.

FAQ

What is the maximum SPI clock frequency supported by the AT25M02-UUM-T?

The AT25M02-UUM-T supports up to 5 MHz clock frequency at VCC = 5.0V. At lower supply voltages (e.g., 1.8V), the maximum rated frequency remains 5 MHz per AC specifications, though actual achievable speed may be limited by system-level signal integrity and timing margins. The device complies with SPI Modes 0 and 3, with data latched on the rising edge of SCK and output on the falling edge.

Does the AT25M02-UUM-T support hardware write protection independent of software configuration?

Yes, the AT25M02-UUM-T supports hardware write protection via its dedicated WP pin. When WP is driven low and the WPEN bit in the STATUS register is set to 1, all writes to the STATUS register are blocked - including changes to block protection bits (BP1/BP0). This provides a physical layer of defense against accidental or malicious firmware corruption, even if software fails or is compromised.

What package type is used for the AT25M02-UUM-T, and what are its key mechanical characteristics?

The AT25M02-UUM-T uses an 8-ball Wafer-Level Chip-Scale Package (WLCSP). Its dimensions are 1.5 mm × 1.5 mm with 0.5 mm ball pitch and total height less than 0.5 mm. This ultra-compact, RoHS-compliant package enables high-density PCB layouts in wearables, hearing aids, and other miniaturized electronics where board space and profile are constrained.

How does the HOLD pin function during an active write cycle in the AT25M02-UUM-T?

The HOLD pin has no effect on an ongoing internal write cycle in the AT25M02-UUM-T. While HOLD can suspend SPI command/data transfer during read or write instruction phases, once the self-timed write cycle begins (after WRITE command and data are accepted), asserting HOLD will not pause or abort the internal programming operation. The device continues writing and asserts RDY/BSY = 1 until completion, after which SO returns to active state.

What is the default state of the STATUS register in the AT25M02-UUM-T upon power-up?

Upon power-up, the AT25M02-UUM-T defaults to Standby mode with WEL = 0 (write disabled), RDY/BSY = 0 (ready), WPEN = 0 (hardware write protection disabled), and BP1/BP0 = 00 (no array protection). The WPEN and BP bits retain their last written values across power cycles since they are nonvolatile, but factory shipment sets WPEN = 0 and BP1/BP0 = 00, allowing full memory access until explicitly configured.