STMicroelectronics STCN75M2F

Overview

STCN75M2F from STMicroelectronics is a digital temperature sensor IC with integrated thermal watchdog functionality, operating as a sigma-delta ADC-based sensor with I²C/SMBus interface. It delivers ±0.5 °C typical accuracy from –55 °C to +125 °C, features programmable overtemperature thresholds (TOS/THYS), open-drain OS/INT output configurable as comparator or interrupt, and operates from 2.7 V to 5.5 V with 125 µA typical supply current - used in PC thermal management, power supply monitoring, and industrial controller thermal protection.

For engineers reviewing the STCN75M2F datasheet, STCN75M2F pinout, STCN75M2F application, or STCN75M2F equivalent, this page provides verified technical context, validated pin functions, confirmed thermal alarm behavior, and real-world selection guidance for embedded thermal sensing where standalone thermostat operation and bus-addressable multi-sensor deployment are required.

Technical Context

The STCN75M2F integrates a bandgap temperature sensor and 9-bit sigma-delta ADC, digitizing temperature into a 16-bit two's complement value with resolution of 0.5 °C per LSB. Its thermal alarm logic compares real-time readings against user-programmable TOS (overlimit) and THYS (hysteresis) registers, supporting both comparator and interrupt modes with fault tolerance (1/2/4/6 consecutive faults) to suppress noise-induced false triggers.

It implements a full 2-wire I²C-compatible interface with selectable slave address via A0–A2 pins (8 unique addresses), supports up to 400 kHz clock rate, and retains register accessibility-including configuration, temperature, TOS, and THYS-during shutdown mode. Power-up defaults enable immediate thermostat operation without host initialization.

Key Specifications

Pinout & Package

STCN75M2F is housed in an MSOP8 (TSSOP8) package: 8-lead, thin shrink small outline, 3 mm × 3 mm body, 0.65 mm pitch, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor with thermal watchdog applications.

Compared with TCN75A and LM75BIMM/NOPB, STCN75M2F uniquely combines extended low-temperature range, programmable fault tolerance, and dual-mode OS/INT - making it the preferred choice for thermally demanding, noise-prone, or multi-node embedded systems requiring field-proven reliability.

Availability

STCN75M2F is available at Aetrix Electronics and suitable for server thermal management, industrial PLC guarding, and DC-DC converter protection requiring stable component supply across long-lifecycle deployments.

Supply support for STCN75M2F 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, sensors, power ICs, and analog devices for industrial, automotive, and consumer markets.

STCN75M2F belongs to ST's precision analog sensor product line, engineered specifically for embedded thermal monitoring applications where accuracy, low power, and autonomous alarm capability are essential - not merely generic temperature readout.

FAQ

What is the default I²C address of STCN75M2F at power-up?

The default I²C slave address is 1001000b (0x48 hex), determined by A2=A1=A0=GND. All three address pins are hardwired inputs - tying any combination to VDD or GND selects one of eight possible addresses (0x48–0x4F). No internal EEPROM or auto-addressing is implemented; address is purely hardware-configured.

Can STCN75M2F operate without a microcontroller after power-up?

Yes - power-up defaults configure the device in comparator mode with active-low OS/INT, enabling fully autonomous thermostat operation. Once TOS and THYS thresholds are set (via initial I²C write), the OS/INT pin will assert and deassert based solely on measured temperature, independent of host interaction.

How does fault tolerance affect OS/INT timing in comparator mode?

In comparator mode, OS/INT asserts one conversion time (45 ms typ) after the specified number of consecutive overtemperature readings (e.g., 4 for FT=10b) is met. It remains asserted until the temperature falls below THYS - then resets immediately. Fault tolerance does not delay deassertion; only assertion is delayed by the fault queue count.

Is the OS/INT pin truly dual-purpose, and how is its mode selected?

Yes - OS/INT serves as either comparator output (latching, self-resetting on hysteresis crossing) or interrupt output (pulse, cleared only by reading any register). Mode is selected via the "POL" and "MOD" bits in the Configuration Register (address 01h): MOD=0 → comparator; MOD=1 → interrupt. POL controls active-high/low polarity.