STMicroelectronics M24C32-FMH6TG

Overview

M24C32-FMH6TG from STMicroelectronics is a 32-Kbit I²C-compatible serial EEPROM organized as 4 K × 8 bits, featuring hardware write protection (WC pin), 32-byte page write capability, and operation from 1.7 V to 5.5 V across –40 °C to +85 °C. It supports I²C bus speeds up to 1 MHz (fast mode plus) and includes an identification page for secure parameter storage in M24C32-DF variants - deployed in industrial sensor calibration and embedded system configuration storage.

For engineers reviewing the M24C32-FMH6TG datasheet, M24C32-FMH6TG pinout, M24C32-FMH6TG application, or M24C32-FMH6TG equivalent, key selection criteria include I²C voltage compatibility (1.7–5.5 V), WC-controlled full-array write protection, 5 ms max byte/page write time, and SO8N/TSSOP8/UFDFPN8/UFDFPN5 package options - especially critical for space-constrained PCBs requiring DFN5 footprint.

Technical Context

The M24C32-FMH6TG implements a standard I²C target protocol with 7-bit device addressing, where E0–E2 pins configure the three LSBs of the slave address (0x50–0x57). Its internal architecture includes a 4 Kbyte memory array with 32-byte page boundaries and optional 32-byte identification page (not enabled in -F variant per DS0952 Rev 33).

It integrates a power-on reset (POR) circuit that prevents spurious writes during power-up, and features open-drain SDA with external pull-up requirement. Write control (WC) operates as active-high hardware lock: when high, all write instructions (including address bytes) are acknowledged but data bytes receive NACK - enabling fail-safe firmware update guardrails.

Key Specifications

Pinout & Package

Package: UFDFPN5 (MH), 1.7 mm × 1.4 mm, 0.4 mm pitch, 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 are not bonded and read as logic low (000), fixing device address to 0x50.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D and CAT24C32HU4I, M24C32-FMH6TG uniquely combines 1 MHz I²C support, hardware WC pin, and ECOPACK2-compliant DFN5 packaging - making it optimal for compact, safety-critical, high-speed embedded storage where deterministic write disable and minimal footprint are non-negotiable.

Availability

M24C32-FMH6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power meter firmware logging requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for M24C32-FMH6TG 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.

M24C32-FMH6TG belongs to ST's M24C serial EEPROM product line, engineered specifically for robust, low-voltage, I²C-based nonvolatile storage in space-constrained and reliability-critical embedded systems.

FAQ

What is the device address of M24C32-FMH6TG in I²C communication?

The M24C32-FMH6TG uses the UFDFPN5 (MH) package, where E0–E2 pins are unconnected and read as logic low (000). This fixes the 7-bit device address to 0x50 for write operations and 0x51 for read operations, per the I²C device select code format defined in DS0952 Rev 33 Section 4.5 and Table 2.

Does M24C32-FMH6TG support the identification page feature?

No. The identification page (32-byte additional memory with permanent lock capability) is exclusive to the M24C32-DF variant. The M24C32-FMH6TG is part of the M24C32-F series, which omits this feature - confirmed in DS0952 Rev 33 Section 1 (Description) and Table 1 (Product status), where "-DF" denotes identification page inclusion.

How does the WC pin affect I²C acknowledge behavior during write attempts?

When WC is high, the device acknowledges the device select code and address bytes (indicating correct address match), but returns NACK for all subsequent data bytes - preventing memory modification while maintaining bus protocol compliance. This behavior is documented in DS0952 Rev 33 Section 5.1 and Figure 8.

Can M24C32-FMH6TG operate reliably at 1.7 V across its full temperature range?

Yes. DS0952 Rev 33 Section 1 explicitly states that M24C32-F variants operate from 1.7 V to 5.5 V over –40 °C to +85 °C. Electrical characteristics tables (Section 8) validate AC timing (e.g., tBUF, tHD:STA) and DC parameters (e.g., VIH, VIL) at 1.7 V min under these conditions.