STMicroelectronics STDS75M2E

Overview

STDS75M2E from STMicroelectronics is a high-precision digital temperature sensor IC with integrated delta-sigma ADC, I²C/SMBus interface, and programmable thermal watchdog functionality. It measures temperatures from –55 °C to +125 °C with ±0.5 °C typical accuracy (±2 °C max from –25 °C to +100 °C), operates from 2.7 V to 5.5 V, draws 125 µA typical supply current, and delivers user-configurable 9–12-bit resolution (0.5 °C to 0.0625 °C step). It is used in system thermal management for PCs, industrial controllers, and power supply modules.

For engineers reviewing the STDS75M2E datasheet, STDS75M2E pinout, STDS75M2E application, or STDS75M2E equivalent, key selection considerations include its open-drain OS/INT alert output, 8-device I²C bus addressability via A0–A2 pins, shutdown mode for ultra-low-power operation, and pin/software compatibility with DS75 for drop-in replacement in legacy thermal monitoring designs.

Technical Context

The STDS75M2E integrates a bandgap-based temperature sensor and a 9–12-bit delta-sigma ADC with two's complement output format. Its digital interface complies with I²C Fast Mode (400 kHz) and SMBus specifications, supporting standard read/write register access to temperature, configuration, TOS (overlimit setpoint), and THYS (hysteresis) registers.

It implements dual-mode thermal event handling: comparator mode maintains latched OS/INT activation until temperature falls below THYS, while interrupt mode requires explicit register read or shutdown to clear the alert. Fault tolerance (FT1/FT0 bits) enables configurable 2–4 consecutive overtemperature samples before OS/INT assertion, enhancing noise immunity in electrically noisy environments.

Key Specifications

Pinout & Package

STDS75M2E is housed in an MSOP8 (TSSOP8) package - 8-lead, thin shrink small outline, 3 mm × 3 mm body, 0.65 mm pitch - suitable for space-constrained PCB layouts in consumer and industrial equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX31875 and LM75B, STDS75M2E uniquely combines ±0.5 °C accuracy, programmable resolution, fault-tolerant comparator mode, and true hardware-level thermal shutdown - making it optimal for safety-aware embedded systems requiring both precision and robustness.

Availability

STDS75M2E is available at Aetrix Electronics and suitable for server thermal management, industrial PLC protection, medical power supply regulation, and consumer SSD thermal throttling requiring stable component supply across long-lifecycle programs.

Supply support for STDS75M2E 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, analog ICs, MEMS, and power management solutions for automotive, industrial, and consumer markets.

STDS75M2E belongs to ST's precision analog sensor product line, engineered specifically for embedded thermal monitoring and fail-safe thermal protection in resource-constrained, high-reliability systems.

FAQ

What is the default I²C address of STDS75M2E at power-up?

The STDS75M2E defaults to I²C slave address 0x48 (1001000b) when all address pins A2–A0 are grounded. This base address shifts by +1 per logic-high address pin: A0 = 1 → 0x49, A1 = 1 → 0x4A, etc., enabling up to eight unique addresses on a single bus without external address translation logic.

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

In comparator mode, OS/INT remains asserted until temperature drops below THYS - ideal for latched hardware shutdown. In interrupt mode, OS/INT clears only upon register read or entry into shutdown mode, then reasserts only after temperature falls below THYS and rises above TOS again - suited for event-driven firmware polling with precise hysteresis control.

Can STDS75M2E operate without a microcontroller?

Yes - STDS75M2E supports standalone thermostat operation using power-up defaults: 9-bit resolution, active-low OS/INT, comparator mode, and factory-programmed TOS/THYS values. It can directly drive external circuitry (e.g., MOSFET gate or latch) for hardware thermal cutoff without MCU intervention.

Is an external bypass capacitor required for stable operation?

A 0.1 µF ceramic bypass capacitor between VDD and GND is recommended per ST's layout guidelines. It suppresses high-frequency supply noise that could affect ADC accuracy and I²C signal integrity, especially in mixed-signal PCBs with switching regulators or motor drivers nearby.