Microchip Technology AT24C32E-STUM-T

Overview

AT24C32E-STUM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write protection via WP pin - used for firmware parameter storage in embedded controllers and sensor calibration data retention.

For engineers reviewing the AT24C32E-STUM-T datasheet, AT24C32E-STUM-T pinout, AT24C32E-STUM-T application, or AT24C32E-STUM-T equivalent, key selection considerations include I²C bus voltage compatibility (1.7–3.6V), page-write timing (≤5 ms), standby current (≤0.8 µA), and package-specific pin mapping for UDFN-8.

Technical Context

The AT24C32E-STUM-T implements a two-wire I²C interface with Schmitt-triggered, filtered SCL/SDA inputs for noise immunity, supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level, and uses internal address latching with A0–A2 hardware-selectable device addressing for multi-device bus configurations.

It features a 32-byte page-write architecture enabling partial writes, self-timed internal write cycles (max 5 ms), and hardware write protection via dedicated WP pin tied to VCC for full-array lockout - all managed without external timing components or host intervention during write execution.

Key Specifications

Pinout & Package

AT24C32E-STUM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T, AT24C32E-STUM-T offers smaller UDFN-8 packaging and wettable flanks for reliable reflow inspection; versus M24C32-WMN6TP, it delivers 2.5× faster writes at 1 MHz but requires ≥2.5V for that speed - making it optimal for compact, high-throughput 3.3V designs.

Availability

AT24C32E-STUM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, automotive body control modules, and smart home hubs requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C32E-STUM-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The AT24C32E belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, low-power embedded systems requiring reliable non-volatile storage in space-constrained industrial and consumer applications.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32E-STUM-T?

The AT24C32E-STUM-T supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). The 1 MHz speed is guaranteed only when VCC is between 2.5V and 3.6V; below 2.5V, maximum speed drops to 400 kHz. This graded performance allows designers to optimize bus timing based on actual supply rail conditions without changing firmware.

Does the AT24C32E-STUM-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32E-STUM-T requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. Recommended values are ≤1.3 kΩ for 1 MHz operation, ≤4 kΩ for 400 kHz, and ≤10 kΩ for 100 kHz - selected based on bus capacitance and rise-time requirements per I²C specification. No internal pull-ups are enabled.

How does the write-protect (WP) pin function on the AT24C32E-STUM-T?

When the WP pin is driven to VCC, the AT24C32E-STUM-T inhibits all write operations to its entire memory array - including byte, page, and sequential writes. When WP is at GND, normal write access is enabled. If left floating, WP is internally pulled down to GND, but Microchip recommends hardwiring it to avoid noise-induced false protection activation.

What is the memory organization of the AT24C32E-STUM-T?

The AT24C32E-STUM-T organizes its 32,768 bits as 4,096 words of 8 bits each, arranged in 128 pages of 32 bytes. This structure enables efficient page-write operations where up to 32 bytes can be written in a single cycle (≤5 ms), and partial writes within a page are fully supported - improving flexibility for small-data updates.

Is the AT24C32E-STUM-T compatible with standard I²C protocol implementations?

Yes, the AT24C32E-STUM-T is fully compliant with the NXP I²C-bus specification, supporting standard Start/Stop conditions, ACK/NACK handshaking, 7-bit addressing with 1010xxx prefix, and bidirectional data transfer synchronized to SCL edges. It also includes integrated Schmitt triggers and spike filters to meet I²C noise immunity requirements in real-world layouts.