Microchip Technology AT34C02B-10TU-1.7

Overview

AT34C02B-10TU-1.7 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 1.7V to 3.6V operation. It supports 100 kHz I²C communication at 1.7V and 400 kHz at ≥2.7V, features 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 low-voltage reliability is critical.

For engineers reviewing the AT34C02B-10TU-1.7 datasheet, AT34C02B-10TU-1.7 pinout, AT34C02B-10TU-1.7 application, or AT34C02B-10TU-1.7 equivalent, this device is selected for space-constrained, low-power designs requiring dual-layer write protection (software + hardware), guaranteed 1.7V operation, and JEDEC-compliant TSSOP-8 packaging with RoHS/lead-free compliance.

Technical Context

The AT34C02B-10TU-1.7 implements a two-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain SDA output. Its internal architecture includes addressable 16-page × 16-byte memory organization, a dedicated write protect circuitry that interprets WP pin state and software register status independently, and a high-voltage pump for EEPROM programming during tWR ≤ 5 ms.

It supports three distinct write protection modes: full-array hardware lock via WP = VCC; first-half (00H–7FH) permanent software lock (irreversible); and first-half reversible software lock (enable/clear via specific command sequences). Device addressing uses A2–A0 pins for up to eight devices on one bus, with 1010xxxR/W base code for standard access and 0110xxxW for write protect register control.

Key Specifications

Pinout & Package

AT34C02B-10TU-1.7 is packaged in an 8-lead TSSOP (JEDEC MO-153, variation AA), 4.4 mm body width, 0.65 mm pitch, RoHS-compliant and lead-free ("U" suffix). 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, the AT34C02B-10TU-1.7 lacks updated ESD specs but retains identical functional behavior and pin compatibility; versus M24C02-RMN6TP, it offers unique dual-mode software protection at the cost of narrower voltage headroom above 3.6 V.

Availability

AT34C02B-10TU-1.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, smart energy metering, and automotive body control module applications requiring stable component supply and long-term obsolescence management.

Supply support for AT34C02B-10TU-1.7 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 its legacy EEPROM portfolio with full documentation, qualification, and support. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT34C02B-10TU-1.7 belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained embedded systems where dual-layer (hardware + software) write protection is mandatory.

FAQ

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

The AT34C02B-10TU-1.7 operates from 1.7 V to 3.6 V DC. It guarantees full functionality-including 100 kHz I²C communication, write operations, and read operations-at the minimum 1.7 V supply. This makes the AT34C02B-10TU-1.7 suitable for battery-backed or ultra-low-power systems where supply rails dip near 1.8 V logic thresholds.

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

Yes, the AT34C02B-10TU-1.7 supports 16-byte page writes. Its 2048-bit memory is internally organized into 16 pages of 16 bytes each. Page writes reduce I²C transaction overhead compared to byte writes and are enabled by omitting the STOP condition after the first byte and transmitting up to 15 additional bytes before issuing STOP.

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

Hardware write protection on the AT34C02B-10TU-1.7 is controlled by the WP pin: when pulled to VCC, all write operations (including software write protect register programming) are inhibited. When WP is low or floating, software-based protection modes (permanent or reversible) become active. The AT34C02B-10TU-1.7's WP circuitry is independent of software registers and cannot be overridden by I²C commands.

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

No-the permanent software write protection (PSWP) on the AT34C02B-10TU-1.7 is irreversible once programmed. It locks the first 1024 bits (addresses 00H–7FH) against all future writes, even after power cycling. This feature is intended for factory-programmed security-critical data such as cryptographic keys or calibration constants that must never be altered in the field.

What packages are available for the AT34C02B-10TU-1.7, and what does "TU" signify?

The "TU" in AT34C02B-10TU-1.7 denotes the 8-lead TSSOP package (JEDEC MO-153, 4.4 mm body width). Other variants include SOIC (SN), Mini-MAP (Y6), and dBGA2 (U3). All packages are RoHS-compliant and lead-free; the "U" suffix confirms green packaging per EU directives. The TSSOP variant offers compact footprint and thermal performance suitable for dense PCB layouts.