Microchip Technology AT24C02B-TSU-T

Overview

AT24C02B-TSU-T from Microchip Technology (formerly Atmel) is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 1.8 V to 5.5 V, featuring hardware write protection via the WP pin and supporting up to 1 MHz clock rate at 5 V. It is used for nonvolatile parameter storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT24C02B-TSU-T datasheet, AT24C02B-TSU-T pinout, AT24C02B-TSU-T application, or AT24C02B-TSU-T equivalent, key selection considerations include its 5-lead SOT23 package, 1.8 V minimum supply, 8-byte page write capability, 1 million write endurance, and hardware-based write protection logic tied to the WP pin.

Technical Context

The AT24C02B-TSU-T implements a two-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and open-drain SDA output compatible with standard I²C bus timing. Its internal address counter supports current-address, random-address, and sequential read modes, while device addressing uses hardwired A0–A2 pins to allow up to eight devices on one bus.

Write operations include byte-write and 8-byte page-write modes with self-timed internal write cycles (max 5 ms), and acknowledge polling enables host synchronization without fixed delays. The WP pin provides hardware-level protection: when pulled high, it locks the full 2 Kbit array; when grounded, normal read/write access is enabled.

Key Specifications

Pinout & Package

AT24C02B-TSU-T is packaged in a 5-lead SOT23 (package code 5TS1), measuring 2.90 mm × 1.60 mm × 1.10 mm max, with pin 1 marked by a dot. This ultra-compact surface-mount package targets space-constrained PCBs in portable and wearable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and BR24G02NUX-10, the AT24C02B-TSU-T uniquely combines 5-lead SOT23 packaging, hardware WP pin, and 1 MHz I²C support - making it the only option that satisfies simultaneous constraints of ultra-compact layout, robust write security, and high-speed bus throughput.

Availability

AT24C02B-TSU-T is available at Aetrix Electronics and suitable for industrial sensor nodes, consumer power adapters, medical wearables, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for AT24C02B-TSU-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 acquired Atmel in 2016 and maintains full product support, qualification, and manufacturing continuity for the AT24C02B series.

The AT24C02B belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems where pin count, board area, and write security are critical.

FAQ

What is the package type and dimensions of the AT24C02B-TSU-T?

The AT24C02B-TSU-T uses a 5-lead SOT23 package (JEDEC MO-193 AB), with body dimensions of 2.90 mm × 1.60 mm × 1.10 mm maximum height. Pin 1 is marked by a dot, and the package is lead-free/halogen-free, qualified for reflow up to 260 °C. This compact footprint is ideal for space-limited applications such as wearables and portable power supplies.

How does the WP pin function on the AT24C02B-TSU-T?

On the AT24C02B-TSU-T, the WP (Write Protect) pin provides hardware-level write inhibition: when pulled high to VCC, it locks the entire 2 Kbit memory array against writes; when grounded, full read/write access is enabled. Unlike software-only protection, this prevents accidental or malicious overwrites even during brown-out or reset conditions - a critical feature for safety-critical firmware parameters.

What I²C speeds does the AT24C02B-TSU-T support at different supply voltages?

The AT24C02B-TSU-T supports 400 kHz I²C communication at 1.8 V, 2.5 V, and 2.7 V supply levels, and up to 1 MHz at 5.0 V. These speed grades are guaranteed across the full industrial temperature range (–40 °C to +85 °C) and are validated under specified capacitive bus loading (≤100 pF). The device automatically adapts to the host's clock rate without configuration.

Can the AT24C02B-TSU-T be used in automotive applications?

The AT24C02B-TSU-T is not qualified for automotive AEC-Q100 stress testing and is not recommended for safety-critical automotive functions. While the base AT24C02B family includes automotive-grade variants (e.g., AT24C02BN-SH-T), the TSU-T suffix denotes an industrial-temperature, SOT23-packaged part intended for commercial and industrial use - not automotive under-hood or chassis applications.

What is the memory organization and addressing scheme of the AT24C02B-TSU-T?

The AT24C02B-TSU-T contains 256 words of 8-bit memory (2048 bits total), internally arranged in 32 pages of 8 bytes each. It uses a 7-bit I²C device address where bits A2–A0 are hardwired to the package pins, allowing up to eight devices on one bus. The eighth bit selects read (1) or write (0) mode, and data word addressing uses an 8-bit internal counter that rolls over within pages during page writes.