STMicroelectronics M24C02-FMH6TG

Overview

M24C02-FMH6TG from STMicroelectronics is a 2-Kbit (256-byte) I²C-compatible serial EEPROM organized as 256 × 8 bits, operating as a slave device on standard and fast-mode I²C buses (up to 400 kHz), with 1.7 V to 5.5 V supply range, -40 °C to +85 °C operation, and hardware write protection via WC pin - used for parameter storage in industrial sensors and embedded control modules.

For engineers reviewing the M24C02-FMH6TG datasheet, M24C02-FMH6TG pinout, M24C02-FMH6TG application, or M24C02-FMH6TG equivalent, this page delivers verified package mapping (UFDFPN5), terminal roles (E0–E2 unconnected, WC-controlled full-array protection), I²C timing compliance (t_W ≤ 5 ms), and real-world endurance (4M write cycles, 200-year data retention).

Technical Context

The M24C02-FMH6TG implements a fully synchronous I²C slave interface with start/stop detection, ACK/NACK handshaking, and internal address counter auto-increment. It supports random and sequential read modes, byte and 16-byte page writes, and uses an internal high-voltage generator for EEPROM programming.

Its write control (WC) input enables hardware-level memory lockout: when driven high, all write attempts are rejected with NACK, while SDA remains functional for reads. The device includes a power-on reset (POR) circuit ensuring no spurious writes during VCC ramp-up, and ESD protection rated to ±3 kV (HBM).

Key Specifications

Pinout & Package

Package: UFDFPN5 (1.7 mm × 1.4 mm, 0.5 mm pitch, ECOPACK2-compliant, RoHS/halogen-free). Pins E0, E1, and E2 are not connected - device address fixed to 1010000x (b3–b1 = 000) per DS9398 Section 4.5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and BR24G02-3MNUX, the M24C02-FMH6TG uniquely combines hardware WC-based write protection, 4M-cycle endurance, and full-temperature 1.7 V operation - making it optimal for safety-critical or high-durability embedded storage where firmware cannot guarantee exclusive bus access.

Availability

M24C02-FMH6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter parameter retention, and IoT edge node configuration requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for M24C02-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.

The M24C02-FMH6TG belongs to ST's M24C serial EEPROM product line, engineered specifically for robust, low-voltage, I²C-based nonvolatile storage in space-constrained and mission-critical embedded systems.

FAQ

What is the function of the WC pin on M24C02-FMH6TG?

The WC (Write Control) pin is an active-high hardware enable that disables all write operations to the entire memory array when driven high. During WC = high, the device acknowledges device select and address bytes but returns NACK for data bytes - preserving read functionality while preventing accidental or malicious writes. This behavior is electrically enforced and does not require firmware interaction.

Can M24C02-FMH6TG operate at 1.6 V supply voltage?

Yes, but only under restricted temperature conditions: per DS9398 Table 7, 1.60–1.65 V operation is permitted only when ambient temperature is ≥0 °C for write operations and ≥−20 °C for reads. Full-spec operation (1.7 V to 5.5 V) applies across the full −40 °C to +85 °C range. Designers must implement voltage monitoring if using sub-1.7 V rails.

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

The UFDFPN5 (1.7 mm × 1.4 mm) package uses a bottom-exposed thermal pad connected to VSS, enabling efficient heat dissipation despite its small footprint. Layout requires solder paste stencil design per IPC-7351B, thermal relief for VSS pad, and strict 0.5 mm pitch routing. Its 50% smaller area than SO8N reduces parasitic capacitance, improving I²C signal integrity at 400 kHz.

Is the M24C02-FMH6TG compatible with standard I²C bus arbitration and multi-master systems?

Yes - it fully complies with I²C specification v3.0: it detects START/STOP conditions, releases SDA during ACK/NACK, and enters standby after STOP. As a pure slave, it does not initiate arbitration but correctly responds to collisions by releasing SDA when losing arbitration. Its open-drain SDA output and 8 pF input capacitance meet bus loading requirements for up to 10 devices on a 400 kHz bus.