Microchip Technology AT34C02B-10TU-1.7-T

Overview

AT34C02B-10TU-1.7-T from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) two-wire serial EEPROM with permanent and reversible software write protection, hardware write protect (WP pin), and low-voltage operation from 1.7 V to 3.6 V. It supports 100 kHz (at 1.7 V) and 400 kHz (at 2.7 V/3.6 V) I²C-compatible communication, 16-byte page writes, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and embedded system configuration memory where robust nonvolatile data integrity is required.

For engineers reviewing the AT34C02B-10TU-1.7-T datasheet, AT34C02B-10TU-1.7-T pinout, AT34C02B-10TU-1.7-T application, or AT34C02B-10TU-1.7-T equivalent, this page provides verified functional specifications, validated pin functions, confirmed package mapping to TSSOP-8, real-world write protection behavior, and cross-referenced alternatives for legacy design continuity and supply assurance.

Technical Context

The AT34C02B-10TU-1.7-T implements a two-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain SDA output. Its internal architecture includes a 256-word × 8-bit EEPROM array segmented into 16 pages of 16 bytes each, with address decoding via A0–A2 pins and hardware write control via the WP pin.

It features dual-layer write protection: permanent software write protection (PSWP) for addresses 00H–7FH, reversible software write protection (RSWP) for the same range, and full-array hardware protection when WP = VCC. All write operations - byte or page - are self-timed with a maximum 5 ms internal cycle, during which inputs are disabled and acknowledge polling is required to confirm completion.

Key Specifications

Pinout & Package

AT34C02B-10TU-1.7-T is packaged in an 8-lead TSSOP (JEDEC MO-153, variation AA), 4.4 mm body width, 0.65 mm pitch, with gull-wing leads. Pin 1 is marked by a notch or dot at the top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT34C02C-10TU-1.7-T, the AT34C02B-10TU-1.7-T offers identical core functionality but lacks updated ESD specs and noise-hardened WP logic; versus M24C02-RMN6TP, it provides superior write-protection granularity at the cost of narrower voltage headroom and vendor-specific command protocols.

Availability

AT34C02B-10TU-1.7-T is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, medical device parameter archiving, and energy meter firmware logging requiring stable component supply across extended product lifecycles.

Supply support for AT34C02B-10TU-1.7-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 technical and supply chain responsibility for the AT34C02B family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT34C02B belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained embedded systems where write protection integrity and long-term data retention are critical.

FAQ

What is the operating voltage range of the AT34C02B-10TU-1.7-T?

The AT34C02B-10TU-1.7-T operates from 1.7 V to 3.6 V DC. This low-voltage range enables direct interfacing with 1.8 V logic families and battery-powered systems without level translation. Performance parameters-including 100 kHz I²C speed and standby current-are guaranteed across this full range, with 400 kHz operation supported only above 2.7 V.

Does the AT34C02B-10TU-1.7-T support page writes, and what is the page size?

Yes, the AT34C02B-10TU-1.7-T supports 16-byte page writes, with the memory internally organized as 16 pages of 16 bytes each. Partial page writes are allowed, and the lower 4 bits of the address auto-increment within the page. Exceeding 16 bytes causes wraparound to the start of the same page - a behavior that must be managed in host firmware to avoid unintended overwrites.

How does hardware write protection work on the AT34C02B-10TU-1.7-T?

Hardware write protection is controlled by the WP pin: when tied to VCC, all write operations (byte, page, or write-protect register programming) are inhibited regardless of software protection state. When WP is GND or floating, software-based protection (permanent or reversible) governs access to the first-half array (00H–7FH). The WP pin has an internal pull-down, but external termination is strongly recommended to prevent noise-induced misoperation.

Can the permanent software write protection on the AT34C02B-10TU-1.7-T be disabled?

No, the permanent software write protection (PSWP) on the AT34C02B-10TU-1.7-T is irreversible once enabled. It is programmed using a dedicated device address (0110) and cannot be cleared by power cycling, reset, or any command sequence. This feature ensures critical calibration data in the first 1 Kbit (00H–7FH) remains immutable throughout the device's lifetime.

What package type is used for the AT34C02B-10TU-1.7-T?

The AT34C02B-10TU-1.7-T uses an 8-lead TSSOP (Thin Shrink Small Outline Package) per JEDEC MO-153, variation AA, with 4.4 mm body width and 0.65 mm lead pitch. The "TU" in the part number explicitly denotes this TSSOP package, distinguishing it from SOIC (SU), dBGA2 (U3), or MLP (Y6) variants of the same base device.