STMicroelectronics STTS751-0DP3F

Overview

STTS751-0DP3F 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 from –40 °C to +125 °C, 10-bit default resolution (0.25 °C/LSB), and 21 ms typical conversion time - deployed for thermal monitoring in SSDs, servers, and smart batteries.

For engineers reviewing the STTS751-0DP3F datasheet, STTS751-0DP3F pinout, STTS751-0DP3F application, or STTS751-0DP3F equivalent, key selection criteria include SMBus address configurability via Addr/Therm pull-up resistor (7.5 kΩ → 1001000b), open-drain EVENT interrupt output, one-shot mode for ultra-low-power polling, and 400 kHz bus support with ARA protocol compliance.

Technical Context

The STTS751-0DP3F integrates a sigma-delta ADC, digital comparator, and SMBus interface logic to perform autonomous temperature measurement, limit comparison, and alert generation without host intervention between conversions. Its register-mapped architecture supports real-time configuration of resolution (9–12 bit), conversion rate (0.0625–32 Hz), and hysteresis (programmable via THERM hysteresis register).

It implements SMBus Alert Response Address (ARA) protocol handling in hardware: when EVENT asserts, the device responds to general call address 0x14 with its slave address (0x48 for STTS751-0DP3F), enabling multi-sensor interrupt arbitration on shared buses. The Addr/Therm pin serves dual function - address selection input (via external pull-up) and thermally triggered open-drain output for fan control or CPU throttling.

Key Specifications

Pinout & Package

UDFN-6L package (2.0 mm × 2.0 mm × 0.5 mm body height, 0.5 mm pitch), wettable flank design for automated optical inspection (AOI) and reliable reflow soldering in high-volume manufacturing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMMX/NOPB and MAX31875R2+, the STTS751-0DP3F uniquely combines SMBus ARA-compliant interrupt delivery, resistor-selectable addressing, and dual-function Addr/Therm pin - making it the only option supporting both autonomous thermal shutdown and scalable multi-sensor topology in SMBus-based server and storage platforms.

Availability

STTS751-0DP3F is available at Aetrix Electronics and suitable for solid state drives, notebook computers, and telecom base stations requiring stable component supply, long-term lifecycle support, and RoHS/green compliance.

Supply support for STTS751-0DP3F 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 automotive semiconductors.

The STTS751 belongs to ST's precision analog sensor portfolio, engineered specifically for SMBus-based thermal management in space-constrained, power-sensitive computing and storage systems.

FAQ

What SMBus address does STTS751-0DP3F use by default?

The STTS751-0DP3F uses 0x48 (1001000b) as its default SMBus slave address, determined by the 7.5 kΩ ±5% pull-up resistor on the Addr/Therm pin per Table 1 of the datasheet. This address is fixed for this order code and cannot be changed without modifying the external resistor network.

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

In THERM mode, the Addr/Therm pin acts as an open-drain output that pulls low when the measured temperature exceeds the programmable THERM limit register value (default 85 °C). It can directly drive a MOSFET gate or optocoupler to enable hardware-based fan activation or CPU throttling without host processor involvement.

Does STTS751-0DP3F support I²C communication?

No - the STTS751-0DP3F is SMBus 2.0–specific and implements mandatory SMBus features including Alert Response Address (ARA), timeout, and packet error checking (PEC) support. While electrically compatible with I²C buses, it lacks I²C-specific protocols like clock stretching and will not respond correctly to standard I²C read/write sequences.

What is the maximum allowable capacitance on the Addr/Therm pin?

The total capacitance on the Addr/Therm pin must remain below 100 pF, as specified in the Pin Descriptions section (page 7 of DocID16483 Rev 7). Exceeding this limit risks unreliable address detection at power-up and degraded THERM output rise/fall times due to RC time constant effects.