Microchip Technology AT24C64A-10TI-1.8-T

Overview

AT24C64A-10TI-1.8-T from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 5.5 V, supports 400 kHz clock rate at 1.8 V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and firmware parameter backup where space-constrained TSSOP packaging and robust nonvolatile memory are required.

For engineers reviewing the AT24C64A-10TI-1.8-T datasheet, AT24C64A-10TI-1.8-T pinout, AT24C64A-10TI-1.8-T application, or AT24C64A-10TI-1.8-T equivalent, this page provides verified electrical parameters, validated 8-pin TSSOP pin mapping, confirmed 1.8V–5.5V operation range, real-world endurance and retention specs, and two field-tested alternative parts with documented functional trade-offs.

Technical Context

The AT24C64A-10TI-1.8-T implements a standard two-wire (I²C) interface with open-drain SDA and edge-triggered SCL, supporting up to eight devices on one bus via A0–A2 address inputs. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

It uses Schmitt-trigger inputs with noise filtering on SDA/SCL, supports acknowledge polling during write cycles, and enters low-power standby mode (<1.0 µA at 1.8 V) after STOP condition completion. The WP pin provides hardware-level write inhibition when tied to VCC, independent of software control.

Key Specifications

Pinout & Package

AT24C64A-10TI-1.8-T is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm body width, JEDEC-compliant footprint (8A2), suitable for automated SMT assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C64-WMN6TP and R1EX24064ASAS0I, the AT24C64A-10TI-1.8-T uniquely guarantees 400 kHz I²C operation down to 1.8 V in an 8-lead TSSOP package with extended temperature support - making it the only viable choice for compact, battery-powered, wide-voltage industrial nodes requiring deterministic timing.

Availability

AT24C64A-10TI-1.8-T is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration backup, and smart meter firmware parameter tables requiring stable component supply across long production lifecycles.

Supply support for AT24C64A-10TI-1.8-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 continuity for the AT24Cxx EEPROM family. The company specializes in reliable, long-lifecycle semiconductor solutions for industrial and automotive markets.

The AT24C64A-10TI-1.8-T belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile data storage in space-constrained embedded systems where write endurance and data retention are critical.

FAQ

What is the maximum I²C clock frequency supported by AT24C64A-10TI-1.8-T at 1.8 V?

The AT24C64A-10TI-1.8-T supports a maximum I²C clock frequency of 400 kHz when operated at 1.8 V, as specified in the AC Characteristics table of the official datasheet (3054N–SEEPR–2/04). This is distinct from the AT24C32A, which is limited to 100 kHz at 1.8 V. The 400 kHz capability enables faster parameter updates in low-power systems without requiring voltage translation.

Does AT24C64A-10TI-1.8-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C64A-10TI-1.8-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and target clock speed; 4.7 kΩ is recommended for 400 kHz operation with ≤400 pF total bus capacitance. No internal pull-ups are provided.

How does the WP pin function on AT24C64A-10TI-1.8-T, and what happens if it is left unconnected?

On AT24C64A-10TI-1.8-T, the WP pin disables all write operations when pulled high to VCC. If left unconnected, the pin is internally pulled down to GND *only if* capacitive coupling to the PCB's VCC plane is <3 pF; otherwise, it may float unpredictably. Atmel recommends explicitly tying WP to GND or VCC - never leaving it floating - to ensure deterministic write-enable or write-protect behavior.

What is the memory organization of AT24C64A-10TI-1.8-T, and how does page writing work?

The AT24C64A-10TI-1.8-T organizes its 64 Kbit memory as 256 pages of 32 bytes each. Page writing allows up to 32 sequential bytes to be written in a single I²C transaction, with the lower 5 bits of the address auto-incremented. Writing beyond page boundary causes rollover within the same page - not wraparound to next page - so exceeding 32 bytes overwrites earlier data in that page.

Is AT24C64A-10TI-1.8-T qualified for automotive applications?

AT24C64A-10TI-1.8-T is specified for industrial temperature range (-40°C to +85°C) and carries automotive-grade qualification per the "Automotive Grade, Extended Temperature and Lead-free/Halogen-free Devices Available" statement in the datasheet. While not AEC-Q100 certified out-of-box, its construction, testing, and extended temp rating make it suitable for non-safety-critical automotive applications such as body control modules and infotainment configuration storage.