Microchip Technology AT24C32AN-10SU-2.7

Overview

AT24C32AN-10SU-2.7 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) two-wire serial EEPROM with I²C-compatible interface, operating from 2.7V to 5.5V, featuring 32-byte page write capability, hardware write protection via WP pin, and 1 million write cycles endurance. It is used for nonvolatile parameter storage in embedded controllers, power meters, and industrial sensors.

For engineers reviewing the AT24C32AN-10SU-2.7 datasheet, AT24C32AN-10SU-2.7 pinout, AT24C32AN-10SU-2.7 application, or AT24C32AN-10SU-2.7 equivalent, key selection considerations include its 2.7–5.5V supply range, 400 kHz I²C clock compatibility, SOIC-8 package, 100-year data retention, and hardware write-protect functionality.

Technical Context

The AT24C32AN-10SU-2.7 implements a standard two-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It supports up to eight devices on a shared bus using A0–A2 address pins and uses open-drain bidirectional SDA with external pull-up.

It operates in byte-write and 32-byte page-write modes, with self-timed internal write cycles (≤5 ms), automatic address incrementing within pages, and roll-over addressing at page boundaries. Standby current is 2.0 µA at 2.7V, and it features internal pull-down on floating A0–A2 and WP pins under low-capacitance conditions.

Key Specifications

Pinout & Package

AT24C32AN-10SU-2.7 is packaged in an 8-lead JEDEC SOIC (8S1) with 0.150" body width, RoHS-compliant lead finish, and green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and M24C32-WMN6TP, the AT24C32AN-10SU-2.7 delivers optimal balance of voltage margin (2.7V min), proven reliability in SOIC-8, and broad ecosystem support-making it the preferred choice for general-purpose industrial control and metering where strict automotive or ultra-low-voltage specs are not required.

Availability

AT24C32AN-10SU-2.7 is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for AT24C32AN-10SU-2.7 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The AT24C32AN-10SU-2.7 belongs to Microchip's AT24Cxx serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in industrial, medical, and consumer systems where firmware simplicity and long-term data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32AN-10SU-2.7?

The AT24C32AN-10SU-2.7 supports a maximum I²C clock frequency of 400 kHz across its full operating voltage range (2.7V to 5.5V) and temperature range (–40°C to +85°C). This is verified in Table 4 of the official datasheet and applies to both read and write operations, ensuring compatibility with standard-mode I²C controllers without requiring clock stretching or custom timing adjustments.

Does the AT24C32AN-10SU-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32AN-10SU-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 400 kHz operation with ≤400 pF total bus capacitance. The absence of internal pull-ups means omission will result in nonfunctional communication.

How does the write protect (WP) pin function on the AT24C32AN-10SU-2.7?

When the WP pin of the AT24C32AN-10SU-2.7 is driven high to VCC, all write operations-including byte writes, page writes, and memory clearing-are inhibited. When WP is grounded or left floating (with board coupling <3 pF), writes are enabled. This hardware-level protection operates independently of firmware, making it essential for safeguarding calibration data or security keys against accidental or malicious overwrites.

What is the endurance rating and data retention specification for the AT24C32AN-10SU-2.7?

The AT24C32AN-10SU-2.7 is rated for 1 million write cycles per memory location and guarantees 100 years of data retention at +25°C. These values are characterized-not 100% tested-and apply under specified operating conditions (VCC = 2.7–5.5V, TA = –40°C to +85°C). Real-world retention may extend beyond 100 years at lower temperatures, but derating is recommended for mission-critical applications above 85°C.

Is the AT24C32AN-10SU-2.7 pin-compatible with other members of the AT24Cxx family?

Yes, the AT24C32AN-10SU-2.7 is pin-compatible with other 8-lead SOIC variants in the AT24Cxx family-including AT24C16, AT24C64, and AT24C128-sharing identical A0–A2, SDA, SCL, WP, VCC, and GND pin assignments. However, memory size, device address bits, and some AC timing parameters differ, so firmware must be configured for the correct density and timing constraints to ensure reliable operation.