STMicroelectronics M24C32-WDW6TP

Overview

M24C32-WDW6TP from STMicroelectronics is a 32-Kbit I²C-compatible EEPROM organized as 4 K × 8 bits, operating from 2.5 V to 5.5 V over -40 °C to +85 °C. It supports 1 MHz (Fast Mode Plus), 400 kHz (Fast Mode), and 100 kHz (Standard Mode) I²C bus speeds, features 32-byte page write capability, hardware write protection via WC pin, and delivers >4 million write cycles with >200-year data retention - deployed in industrial sensor calibration storage and embedded system configuration backup.

For engineers reviewing the M24C32-WDW6TP datasheet, M24C32-WDW6TP pinout, M24C32-WDW6TP application, or M24C32-WDW6TP equivalent, key selection considerations include I²C timing compliance at 1 MHz, VCC min/max voltage margin for brown-out resilience, WC-controlled full-array write lock behavior, and SO8N/TSSOP8/UFDFPN8/UFDFPN5 package compatibility with PCB layout constraints.

Technical Context

The M24C32-WDW6TP implements a standard I²C target protocol with 7-bit device addressing (1010xxxR/W), where E0–E2 pins define the three LSBs of the address; in the UFDFPN5 variant (DW6TP suffix), E0–E2 are unconnected and internally read as 000. It uses open-drain SDA with external pull-up and supports random/sequential read, byte/page write, and ACK polling for write cycle completion detection.

Internal architecture includes a 4-Kbyte memory array with 32-byte page boundaries, hardware write protection that disables all writes when WC = high, and enhanced latch-up/ESD protection per AEC-Q100 stress categories. The device integrates a power-on reset (POR) circuit ensuring no spurious writes during VCC ramp-up, with internal reset threshold below VCC(min).

Key Specifications

Pinout & Package

Package: UFDFPN5 (MH), 1.7 mm × 1.4 mm, 5-pin DFN with exposed pad (ECOPACK2-compliant). Pin 1 = SDA, Pin 2 = SCL, Pin 3 = WC, Pin 4 = VCC, Pin 5 = VSS. E0–E2 pins omitted - device address fixed to 1010000b (0x50) with R/W bit.

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-3GE2, the M24C32-WDW6TP uniquely combines hardware WC-based full-array lock, guaranteed 1 MHz operation across -40 °C to +85 °C, and ECOPACK2-compliant UFDFPN5 packaging - making it optimal for safety-critical industrial and automotive-adjacent deployments demanding deterministic write disable behavior.

Availability

M24C32-WDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded bootloader settings requiring stable component supply across multi-year production cycles.

Supply support for M24C32-WDW6TP 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, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24C32 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in space- and reliability-constrained embedded systems.

FAQ

What is the function of the WC pin on M24C32-WDW6TP?

The WC (Write Control) pin is an active-high hardware lock that disables all write operations to the entire memory array when driven high. When WC is low or floating, writes are enabled. This provides deterministic, firmware-independent protection against accidental or malicious overwrites - unlike software-based lock bits, WC operates at the silicon level and remains effective even during MCU reset or code corruption events.

Does M24C32-WDW6TP support 1 MHz I²C operation across its full temperature range?

Yes. The M24C32-WDW6TP is fully specified for Fast Mode Plus (1 MHz) I²C operation from -40 °C to +85 °C, with guaranteed tBUF, tHD:STA, and tLOW timing margins per I²C specification. This is validated in ST's DS0952 Rev 33 datasheet AC characteristics tables (Section 8), distinguishing it from variants like M24C32-X which only support 1 MHz up to +70 °C.

How does the UFDFPN5 package affect PCB layout and thermal performance?

The UFDFPN5 (1.7 mm × 1.4 mm) package uses a 5-pin layout with no E0–E1–E2 pins, fixing the I²C address to 0x50. Its small footprint saves board area but requires precise solder paste deposition and reflow profiling due to the exposed thermal pad. Thermal resistance (θ_JA) is ~220 °C/W - adequate for low-duty-cycle EEPROM access, though continuous high-speed writes may require local copper pour under the pad for improved heat dissipation.

Can M24C32-WDW6TP be used as a drop-in replacement for older M24C32-WMN6TP parts?

Yes - both share identical electrical specifications, timing, pinout (SO8N), and functional behavior. The DW6TP suffix denotes UFDFPN5 packaging, while MN6TP indicates SO8N; they are functionally interchangeable where package constraints allow. However, address mapping differs: DW6TP fixes E0–E2 = 000 (0x50), whereas MN6TP allows configurable addressing via external E0–E2 ties - verify I²C bus address collision risk before substitution.