Microchip Technology AT24C01A-10TU-1.8

Overview

AT24C01A-10TU-1.8 from Microchip Technology is a 1K-bit (128 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8V to 5.5V, supports 100 kHz I²C communication at 1.8V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention - used in industrial sensor calibration storage and power-management configuration memory.

For engineers reviewing the AT24C01A-10TU-1.8 datasheet, AT24C01A-10TU-1.8 pinout, AT24C01A-10TU-1.8 application, or AT24C01A-10TU-1.8 equivalent, key selection criteria include 1.8V minimum supply compatibility, 8-pin TSSOP package footprint, page-write capability (8-byte pages), Schmitt-trigger noise immunity on SDA/SCL, and hardware-based WP pin functionality for secure firmware parameter locking.

Technical Context

The AT24C01A-10TU-1.8 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer under strict timing constraints (tLOW = 4.7 µs min at 1.8V). Its internal address counter enables sequential reads across 128 bytes without readdressing.

It uses hard-wired A0–A2 pins for device addressing (up to eight devices per bus), integrates Schmitt-trigger inputs and digital noise filtering on SDA/SCL, and executes self-timed write cycles (≤5 ms) with automatic internal erase/write sequencing - no external timing control required.

Key Specifications

Pinout & Package

AT24C01A-10TU-1.8 is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and green-marked ("U"). Pin 1 is marked by a beveled corner; leads are gull-wing shaped for surface-mount reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01B-SSHM-T, AT24C01A-10TU-1.8 offers TSSOP thermal advantages and legacy design continuity; versus BR24G01FJ-WE2, it provides essential hardware write protection and flexible device addressing - critical for industrial and automotive deployments requiring data integrity assurance.

Availability

AT24C01A-10TU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, and automotive body control module designs requiring stable component supply and long-term obsolescence management.

Supply support for AT24C01A-10TU-1.8 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 components, and nonvolatile memory solutions for industrial, automotive, and communications markets.

The AT24C01A-10TU-1.8 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for low-voltage, space-constrained embedded systems requiring reliable, byte-addressable nonvolatile storage with minimal external components.

FAQ

What is the operating voltage range of the AT24C01A-10TU-1.8?

The AT24C01A-10TU-1.8 operates from 1.8V to 5.5V, with guaranteed 100 kHz I²C functionality at the 1.8V minimum. This dual-range capability allows direct integration with both 1.8V logic domains and legacy 3.3V/5V systems without level-shifting circuitry. The device maintains full read/write functionality across the entire range, including valid timing margins and noise immunity specifications.

Does the AT24C01A-10TU-1.8 support page writes, and what is the page size?

Yes, the AT24C01A-10TU-1.8 supports 8-byte page writes. Internally organized as 16 pages of 8 bytes each, it allows up to eight sequential bytes to be written in a single I²C transaction - significantly improving write efficiency over byte-by-byte operations. Partial page writes are permitted, enabling safe updates of subsets of configuration data without disturbing adjacent bytes in the same page.

How does the Write Protect (WP) pin function on the AT24C01A-10TU-1.8?

When the WP pin is driven high (to VCC), the AT24C01A-10TU-1.8 disables all write operations to its entire 1K memory array - including byte writes, page writes, and write cycles initiated via I²C commands. When WP is grounded, normal read/write access is enabled. This hardware-level protection operates independently of firmware state, providing fail-safe data integrity for critical calibration or security parameters.

What package type is used for the AT24C01A-10TU-1.8, and what are its key mechanical features?

The AT24C01A-10TU-1.8 uses an 8-lead TSSOP package (JEDEC MO-153, variation AA), designated as 8A2 in Microchip's ordering nomenclature. It measures 4.4 mm body width × 3.0 mm length, with 0.65 mm lead pitch and gull-wing leads. The "U" suffix confirms RoHS-compliant, halogen-free construction, and the "T" indicates TSSOP packaging - ideal for high-density PCB layouts requiring thermal efficiency and reflow compatibility.

Is the AT24C01A-10TU-1.8 compatible with standard I²C protocols and timing requirements?

Yes, the AT24C01A-10TU-1.8 fully complies with standard I²C protocol definitions, including START/STOP conditions, ACK/NACK handshaking, and 7-bit slave addressing. At 1.8V, it meets I²C Standard Mode timing: tLOW ≥ 4.7 µs, tHIGH ≥ 4.0 µs, and fSCL ≤ 100 kHz. Its Schmitt-trigger inputs and filtered logic ensure robust operation even with slow-rising or noisy bus signals common in industrial environments.