STMicroelectronics STCN75DS2F

Overview

STCN75DS2F from STMicroelectronics is a digital temperature sensor IC with thermal watchdog functionality, measuring from –55 °C to +125 °C with ±0.5 °C typical accuracy and ±2 °C max accuracy over –25 °C to +100 °C. It features an I²C/SMBus-compatible 2-wire interface, programmable overtemperature threshold (TOS) and hysteresis (THYS), and dual-mode OS/INT output for comparator or interrupt operation - used in system thermal management, power supply modules, and industrial controllers.

For engineers reviewing the STCN75DS2F datasheet, STCN75DS2F pinout, STCN75DS2F application, or STCN75DS2F equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters (2.7–5.5 V supply, 125 µA typical current, 45 ms conversion time), and real-world thermal alarm use cases - all grounded in ST's production data sheet Doc ID 13307 Rev 9.

Technical Context

The STCN75DS2F integrates a bandgap-based temperature sensor and a sigma-delta 9-bit ADC, delivering calibrated 16-bit two's complement temperature data with resolution down to 0.5 °C. Its digital core supports full register access via I²C up to 400 kHz, including configuration, temperature, TOS, and THYS registers.

It implements fault-tolerant thermal monitoring using configurable FT bits (1/2/4/6 consecutive faults) to suppress noise-induced false alarms. The OS/INT pin operates in either comparator mode (latching behavior with hysteresis reset) or interrupt mode (edge-triggered, cleared by any register read), both enabled without host intervention at power-up.

Key Specifications

Pinout & Package

STCN75DS2F is housed in an MSOP8 (TSSOP8) package: 8-lead, thin shrink small outline, 3 mm × 3 mm body, 0.65 mm pitch.

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, STCN75DS2F delivers superior accuracy across –25 °C to +100 °C, integrated fault tolerance for noise immunity, and flexible OS/INT configuration - making it the preferred choice for mission-critical thermal protection in industrial and computing systems.

Availability

STCN75DS2F is available at Aetrix Electronics and suitable for server thermal management, industrial power supply protection, and battery pack safety monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STCN75DS2F 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 products for industrial, automotive, and consumer markets.

STCN75DS2F belongs to ST's precision analog sensor product line, engineered specifically for embedded thermal monitoring applications demanding high accuracy, low power, and autonomous alarm capability without host processor dependency.

FAQ

What is the maximum I²C bus speed supported by STCN75DS2F?

The STCN75DS2F supports standard-mode and fast-mode I²C operation up to 400 kHz, as confirmed in Section 1.1 and Table 12 of the official datasheet (Doc ID 13307 Rev 9). Its AC characteristics specify t_LOW and t_HIGH minima compliant with Fast-mode timing, and no derating is required across its full temperature and voltage range.

How does the OS/INT pin behave in comparator mode versus interrupt mode?

In comparator mode, OS/INT latches low when temperature exceeds TOS and remains asserted until temperature drops below THYS - enabling self-contained shutdown circuits. In interrupt mode, OS/INT pulses low on threshold breach and clears only upon any register read, making it suitable for MCU-driven event handling. Both modes are selected via the POL and MODE bits in the configuration register.

Can STCN75DS2F operate without external pull-up resistors on SDA and OS/INT?

No. SDA and OS/INT are open-drain outputs and require external pull-up resistors to VDD, as explicitly stated in Sections 1.3.1 and 1.3.3 of the datasheet. Typical values are 10 kΩ; omission causes communication failure and non-functional alarm output. SCL may also require pull-up depending on master driver strength.

Is STCN75DS2F RoHS-compliant and halogen-free?

Yes. STCN75DS2F is manufactured in accordance with EU RoHS Directive 2011/65/EU and is halogen-free per ST's material declaration (document number CD-001975). The "DS2F" suffix denotes lead-free, RoHS-compliant packaging in MSOP8 with matte tin finish, verified in the ordering information table (Table 17) of Doc ID 13307 Rev 9.