STMicroelectronics STTS751-1WB3F

Overview

STTS751-1WB3F from STMicroelectronics is a 2.25 V–3.6 V SMBus 2.0–compatible local digital temperature sensor in UDFN-6L (2 mm × 2 mm) package, delivering ±0.5 °C accuracy across –40 °C to +125 °C, programmable 9–12-bit resolution (0.0625–0.5 °C/LSB), and 21 ms typical 10-bit conversion time - deployed for thermal monitoring in SSDs, servers, and smart batteries.

For engineers reviewing the STTS751-1WB3F datasheet, STTS751-1WB3F pinout, STTS751-1WB3F application, or STTS751-1WB3F equivalent, key selection criteria include SMBus address configurability via Addr/Therm pull-up resistor, EVENT open-drain alert output with ARA support, standby current of 3 μA (typ), one-shot mode for burst sensing, and 400 kHz bus compatibility.

Technical Context

The STTS751-1WB3F implements a sigma-delta ADC with digital post-processing to generate two's complement temperature values stored in 16-bit register pairs (e.g., 00h/02h for 10-bit result). Its SMBus interface supports full protocol compliance including WRITE/READ/SEND/RECEIVE byte commands, ALERT Response Address (ARA), and timeout recovery (25–35 ms).

Configuration is managed through dedicated registers: 03h (Config) controls resolution and standby mode; 04h (Conversion Rate) selects 10 discrete sample rates from 0.0625 to 32 Hz; 0Fh triggers one-shot conversion; and 20h/21h define THERM limit and hysteresis for hardware fan/CPU throttling via the Addr/Therm pin.

Key Specifications

Pinout & Package

STTS751-1WB3F is housed in a 2 mm × 2 mm × 0.5 mm UDFN-6L package with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMM/NOPB and MAX31875R2+, STTS751-1WB3F uniquely balances wide temperature accuracy, SMBus ARA scalability, and integrated THERM control - making it optimal for space-constrained, multi-zone thermal management in servers and SSDs.

Availability

STTS751-1WB3F is available at Aetrix Electronics and suitable for solid-state drives, notebook computers, and smart battery systems requiring stable component supply, long-term lifecycle assurance, and RoHS/green compliance.

Supply support for STTS751-1WB3F 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STTS751 belongs to ST's precision analog sensor portfolio, engineered specifically for SMBus-based thermal monitoring in high-density computing and storage platforms where low voltage, low power, and multi-device addressability are critical.

FAQ

What SMBus addresses does STTS751-1WB3F support?

STTS751-1WB3F supports four slave addresses determined by the pull-up resistor value on the Addr/Therm pin: 1001 010b (74h), 1001 011b (75h), 0111 010b (72h), and 0111 011b (73h). These correspond to 7.5 kΩ, 12 kΩ, 20 kΩ, and 33 kΩ resistors respectively. The device variant suffix "-1" distinguishes this set from the "-0" series (72h–75h vs. 70h–73h), enabling up to eight unique addresses on one bus.

How does the Addr/Therm pin function in THERM mode?

When configured as a THERM output, Addr/Therm asserts low if the measured temperature exceeds the value in register 20h (THERM limit), remaining low until temperature falls below (THERM limit – hysteresis), where hysteresis is set in register 21h. This open-drain output can directly drive a MOSFET gate or fan controller, enabling hardware-level thermal throttling independent of host software polling.

Can STTS751-1WB3F operate reliably at 2.25 V?

Yes - STTS751-1WB3F is fully specified down to 2.25 V, with all parameters (including ±0.5 °C accuracy, 400 kHz SMBus, and 21 ms conversion time) guaranteed across the entire 2.25–3.6 V range. Internal regulation and trimming ensure consistent performance without external biasing, making it suitable for battery-powered or ultra-low-voltage SoC domains.

Does STTS751-1WB3F support I²C communication?

STTS751-1WB3F is SMBus 2.0–compliant and interoperates with standard I²C hosts at 100 kHz and 400 kHz, but lacks I²C-specific features like clock stretching. It strictly follows SMBus protocols (WRITE/READ/SEND/RECEIVE byte, ARA, timeout), and its EVENT pin behavior and register map are SMBus-optimized - ensuring robustness in mixed-protocol systems where strict I²C timing margins may not be met.