STMicroelectronics M24C04-FMH6TG

Overview

M24C04-FMH6TG from STMicroelectronics is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8 bits, operating at up to 400 kHz clock frequency with 1.7 V to 5.5 V supply voltage (full temperature range), 16-byte page write capability, and -40 °C to +85 °C industrial temperature rating. It serves as nonvolatile configuration storage in microcontroller-based systems requiring byte- or page-level writes and hardware write protection via WC pin.

For engineers reviewing the M24C04-FMH6TG datasheet, M24C04-FMH6TG pinout, M24C04-FMH6TG application, or M24C04-FMH6TG equivalent, key selection criteria include its 1.7 V minimum VCC support for low-power embedded designs, ECOPACK2-compliant UFDFPN5 (1.7 × 1.4 mm) package with no E1/E2 pins, 4 million write cycles endurance, and hardware-enabled full-array write protection - all verified per DS9387 Rev 6.

Technical Context

This device implements a standard I²C slave protocol with 7-bit device address (1010xxxR/W), where the two least-significant address bits (b3,b2) are determined by E1/E2 inputs - though these pins are unconnected in the UFDFPN5 package, fixing those bits to 00. It supports random and sequential read modes, byte write (≤5 ms), and page write (≤5 ms) with automatic address increment and roll-over within pages.

The internal architecture includes a high-voltage generator for EEPROM programming, page latches for burst writes, and a power-on-reset (POR) circuit that prevents spurious writes during power-up. Write control (WC) is active-high and disables all data writes while still acknowledging device select and address bytes - enabling safe bus arbitration without memory corruption.

Key Specifications

Pinout & Package

Package: UFDFPN5 (ECOPACK2), 5-pin DFN with 1.7 mm × 1.4 mm body and 0.4 mm pitch. Pin 1 marked by top-side laser marking; no exposed thermal pad. E1 and E2 pins are not connected - device address fixed to 101000xx (A8 = pin-selectable, RW = instruction bit).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D-SSHM-T and BR24G04NUX-10, M24C04-FMH6TG offers optimal balance of guaranteed hardware write protection, industry-standard 16-byte page sizing for fine-grained updates, and proven 200-year retention - making it preferred for medical, industrial, and automotive applications where data integrity is non-negotiable.

Availability

M24C04-FMH6TG is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for M24C04-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.

M24C04-FMH6TG belongs to ST's M24C serial EEPROM product line, engineered specifically for robust, low-voltage, I²C-based nonvolatile storage in space- and power-constrained embedded systems.

FAQ

Does M24C04-FMH6TG support 1.6 V operation?

No - M24C04-FMH6TG supports 1.7 V to 5.5 V across the full -40 °C to +85 °C temperature range. While the broader M24C04-F family permits 1.6 V operation under restricted conditions (e.g., limited temperature range or reduced clock frequency), the MH6TG variant is specified and tested only for 1.7 V minimum in industrial-grade applications per DS9387 Rev 6.

How does the WC pin behave during power-up?

The WC pin is sampled after the internal power-on-reset (POR) threshold is crossed. If WC is driven high at that moment, the entire memory array remains write-protected until WC is pulled low or floated. During POR, the device ignores all I²C traffic until VCC stabilizes within spec - preventing partial writes even if WC transitions late.

Can M24C04-FMH6TG be used on the same I²C bus as other M24C04 variants?

Yes, provided address conflicts are avoided. The UFDFPN5 package fixes E1/E2 to 00, resulting in base address 101000xx. Other packages (SO8N, TSSOP8) allow E1/E2 to be tied high/low for address differentiation. Up to four M24C04 devices can coexist on one bus using distinct E1/E2 combinations - but the MH6TG occupies the 101000xx slot exclusively.

What happens during sequential read at the end of memory?

In the UFDFPN5 package, sequential read does not roll over from address 1FFh to 00h. After reading the last byte (address 1FFh), subsequent reads return undefined data - unlike SO8N/TSSOP8 versions which wrap around. Designers must implement address boundary checks in firmware to avoid invalid data retrieval.