Microchip Technology AT24C32AN-10SU-1.8

Overview

AT24C32AN-10SU-1.8 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8V to 5.5V, supports 400 kHz I²C communication, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and portable medical device configuration memory.

For engineers reviewing the AT24C32AN-10SU-1.8 datasheet, AT24C32AN-10SU-1.8 pinout, AT24C32AN-10SU-1.8 application, or AT24C32AN-10SU-1.8 equivalent, key selection factors include its 1.8V minimum supply, 32-byte page write capability, Schmitt-triggered I²C inputs for noise immunity, and TSSOP-8 packaging suitable for space-constrained PCB layouts.

Technical Context

The AT24C32AN-10SU-1.8 implements a standard I²C-compatible two-wire interface with open-drain SDA and active-high SCL, supporting up to eight devices on one bus via A0–A2 address pins. Its internal architecture organizes memory as 128 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

It uses proprietary internal pull-down circuitry on floating A0–A2 and WP pins, ensuring deterministic logic levels when unconnected-critical for robustness in high-noise industrial environments. Standby current is specified at 1.0 µA @ 1.8V, making it suitable for battery-backed applications requiring ultra-low quiescent power.

Key Specifications

Pinout & Package

AT24C32AN-10SU-1.8 is packaged in an 8-lead TSSOP (8A2) measuring 4.4 mm body width, with gull-wing leads and RoHS-compliant lead finish. This package supports automated assembly and provides thermal and mechanical reliability in industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32AN-10SU-1.8, AT24C32D-SSHM-T offers lower standby current in a larger SOIC package, while M24C32-WMN6TP provides second-source flexibility with near-identical DC specs but requires verification of noise immunity and write-cycle timing in safety-critical applications.

Availability

AT24C32AN-10SU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, portable medical device settings, and smart energy meter firmware flag storage requiring stable component supply across multi-year production programs.

Supply support for AT24C32AN-10SU-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 acquired Atmel in 2016 and now manufactures and supports the AT24Cxx family of serial EEPROMs, delivering high-reliability nonvolatile memory solutions for industrial and commercial markets.

The AT24C32A product line was designed specifically for low-voltage, low-power embedded systems requiring robust I²C-based configuration storage with extended data retention and high endurance - targeting applications from wearables to factory automation.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32AN-10SU-1.8?

The AT24C32AN-10SU-1.8 supports a maximum I²C clock frequency of 400 kHz across its full 1.8V to 5.5V supply range. This is verified in Table 4 of the official datasheet (3054T–SEEPR–1/07) under AC Characteristics. It does not support standard-mode-plus (1 MHz) or fast-mode-plus (3.4 MHz) I²C speeds - attempting higher frequencies may result in timing violations or failed ACKs.

Does the AT24C32AN-10SU-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32AN-10SU-1.8 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies that SDA is open-drain driven and may be wire-ORed with other devices. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; 4.7 kΩ is commonly used for 400 kHz operation with ≤400 pF total bus capacitance.

How does the write protect (WP) pin function on the AT24C32AN-10SU-1.8?

When the WP pin of the AT24C32AN-10SU-1.8 is connected to VCC, all write operations (byte and page) to the memory array are inhibited - only read operations remain functional. When WP is connected to GND, full read/write access is enabled. If left floating, the pin is internally pulled down to GND provided board coupling is <3 pF; otherwise, Atmel recommends tying it to GND to ensure predictable behavior.

What is the memory organization of the AT24C32AN-10SU-1.8?

The AT24C32AN-10SU-1.8 contains 32,768 bits organized as 4096 words of 8 bits each (4096 × 8). Internally, this is structured as 128 pages of 32 bytes each. Random addressing requires a 12-bit word address, and page boundaries align every 32 bytes - enabling efficient partial-page writes without disturbing adjacent data within the same page.

Is the AT24C32AN-10SU-1.8 qualified for automotive applications?

No, the AT24C32AN-10SU-1.8 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While the datasheet notes "Automotive Devices Available" for the broader AT24C32A/64A family, this specific variant (–10SU-1.8) is designated for industrial use only. For automotive applications, Microchip offers the AT24C32AN-10MU-1.8 (automotive-grade, –40°C to +125°C), which undergoes additional qualification testing.