STMicroelectronics M24C32-FDW6TP

Overview

M24C32-FDW6TP from STMicroelectronics is a 32-Kbit I²C-compatible EEPROM organized as 4 K × 8 bits, operating from 1.7 V to 5.5 V over –40 °C to +85 °C. It supports I²C bus modes up to 1 MHz (fast mode plus), features 32-byte page write, hardware write protection via WC pin, and includes enhanced ESD/latch-up protection with >4 million write cycles and >200-year data retention. It is used in industrial sensor calibration storage and embedded system configuration backup.

For engineers reviewing the M24C32-FDW6TP datasheet, M24C32-FDW6TP pinout, M24C32-FDW6TP application, or M24C32-FDW6TP equivalent, key selection criteria include supply voltage range (1.7–5.5 V), I²C speed compatibility (100/400 kHz/1 MHz), page size (32 bytes), write protection mechanism (WC pin), and package footprint (UFDFPN5, 1.7 × 1.4 mm).

Technical Context

The device implements a standard I²C target protocol with 7-bit device addressing, supporting random and sequential read modes, byte/page write, and hardware-controlled full-array write inhibition via the WC input. Device select codes differentiate memory access (1010b) from identification page access (1011b), enabling secure parameter storage.

It integrates a power-on reset (POR) circuit that prevents spurious writes during power ramp-up, and uses open-drain SDA with external pull-up-requiring proper bus termination per I²C specification. The internal address counter auto-increments on read/write completion and rolls over at page boundaries.

Key Specifications

Pinout & Package

Package: UFDFPN5 (DFN5), 1.7 mm × 1.4 mm, 0.4 mm pitch, ECOPACK2-compliant, unsawn wafer-tested die. Compact footprint ideal for space-constrained IoT nodes and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and BR24G32FJ-WE2, M24C32-FDW6TP uniquely combines hardware WC pin, dedicated 32-byte ID page, and guaranteed 1.7 V minimum operation-making it optimal for safety-critical or field-serviceable systems requiring physical write disable and secure parameter storage.

Availability

M24C32-FDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge node identity management requiring stable component supply across extended product lifecycles.

Supply support for M24C32-FDW6TP 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and nonvolatile memory for industrial, automotive, and consumer markets.

M24C32-FDW6TP belongs to ST's M24C serial EEPROM product line, engineered for robustness in harsh environments and seamless integration into resource-constrained embedded systems using standard I²C interfaces.

FAQ

What is the function of the WC pin on M24C32-FDW6TP?

The WC (Write Control) pin is an active-high hardware enable/disable for all write operations. When driven high, it prevents byte writes, page writes, and identification page writes-even if valid I²C commands are sent. This provides fail-safe protection against accidental or malicious overwrites during power transients or firmware faults, independent of software state.

Does M24C32-FDW6TP support the I²C fast mode plus (1 MHz) speed?

Yes, M24C32-FDW6TP fully supports I²C fast mode plus at 1 MHz, as well as fast mode (400 kHz) and standard mode (100 kHz). Its AC timing parameters-including t_BUF, t_HD;STA, and t_SU;STA-are specified and tested for 1 MHz operation, enabling high-speed configuration loading in time-sensitive applications like factory programming or OTA updates.

How does the identification page differ from main memory?

The identification page is a separate 32-byte memory region accessible only via device select code 1011b (vs. 1010b for main memory). It supports write and permanent lock operations-once locked, reads remain enabled but writes are rejected with NACK. This enables secure storage of immutable data such as device serial numbers or cryptographic keys without risk of later modification.

Is M24C32-FDW6TP compatible with 1.8 V microcontrollers?

Yes-M24C32-FDW6TP operates down to 1.7 V, making it fully compatible with 1.8 V I/O domains. Its VOL and VOH levels meet I²C specifications at 1.8 V supply, and its SDA/SCL input thresholds are designed for reliable recognition of 1.8 V logic levels. No level-shifting circuitry is required when interfacing with 1.8 V MCUs such as STM32L4 or Nordic nRF52 series.