STMicroelectronics STCN75M2E

Overview

STCN75M2E from STMicroelectronics is a digital temperature sensor and thermal watchdog IC featuring ±0.5 °C (typ) accuracy from –25 °C to +100 °C, 2-wire I²C/SMBus interface, programmable overtemperature threshold (TOS) and hysteresis (THYS), open-drain OS/INT output configurable as comparator or interrupt, and operation across 2.7 V–5.5 V supply. It serves as a standalone thermostat in server power supplies, industrial PLCs, and embedded computing thermal management.

For engineers reviewing the STCN75M2E datasheet, STCN75M2E pinout, STCN75M2E application, or STCN75M2E equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with functional differences, and supply-chain-ready availability details - all grounded in ST's production data sheet Doc ID 13307 Rev 9.

Technical Context

The STCN75M2E integrates a bandgap-based temperature sensor with a sigma-delta ADC delivering 9-bit temperature data (MSBs only used) in two's complement format. Its thermal alarm logic compares real-time measurements against user-programmable TOS and THYS registers, supporting both comparator mode (latching OS/INT until THYS is crossed) and interrupt mode (OS/INT cleared only by register read).

Fault tolerance is implemented via FT1/FT0 bits (1, 2, 4, or 6 consecutive overtemp events required), and shutdown mode reduces current to <1 µA while preserving I²C accessibility. Address selection uses A0–A2 pins, enabling up to eight devices on one bus with slave addresses ranging from 1001000b to 1001111b.

Key Specifications

Pinout & Package

STCN75M2E 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 per manufacturer mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCN75A and LM75BIMM/NOPB, STCN75M2E delivers superior ±0.5 °C typical accuracy, faster 45 ms conversion, integrated fault tolerance filtering, and true shutdown mode - making it the preferred choice for precision thermal protection in high-reliability embedded and industrial systems.

Availability

STCN75M2E is available at Aetrix Electronics and suitable for server power supply thermal monitoring, industrial PLC temperature protection, and embedded computing board thermal management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STCN75M2E 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 management ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

STCN75M2E belongs to ST's precision analog sensor product line, engineered specifically for high-accuracy, low-power thermal monitoring in space-constrained embedded systems where reliability and ease of integration are critical.

FAQ

What is the default I²C address of STCN75M2E at power-up?

The STCN75M2E defaults to I²C slave address 1001000b (0x48 hex) when all address pins A2–A0 are grounded. This matches the TCN75 baseline address and enables immediate compatibility in existing designs without address reconfiguration.

Can STCN75M2E operate without a microcontroller?

Yes - STCN75M2E supports standalone thermostat operation. With TOS and THYS preprogrammed, it autonomously asserts the OS/INT pin in comparator mode upon overtemperature detection, requiring no host processor interaction for basic thermal protection.

How does the fault tolerance feature prevent false alarms?

Fault tolerance requires 1, 2, 4, or 6 consecutive temperature measurements to exceed TOS before asserting OS/INT. This counters transient noise spikes - for example, setting FT=4 means four successive 45 ms conversions must breach threshold, effectively rejecting sub-200 ms electrical disturbances.

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

Yes - OS/INT operates as either comparator (latched) or interrupt (edge-triggered) based on the MODE bit in the configuration register. In comparator mode, it stays active until temperature falls below THYS; in interrupt mode, it clears only upon any register read, enabling precise event capture in interrupt-driven firmware.