STMicroelectronics STTS751-0WB3F

Overview

STTS751-0WB3F from STMicroelectronics is a low-voltage SMBus 2.0–compatible digital temperature sensor in UDFN-6L (2 mm × 2 mm) package, operating from 2.25 V to 3.6 V across –40 °C to +125 °C. It delivers programmable resolution (9–12-bit), ±0.5 °C accuracy over full range, and 21 ms typical conversion time at 10-bit mode-used for thermal monitoring in SSDs, servers, and smart batteries.

For engineers reviewing the STTS751-0WB3F datasheet, STTS751-0WB3F pinout, STTS751-0WB3F application, or STTS751-0WB3F equivalent, key selection criteria include SMBus address configurability via Addr/Therm pull-up resistor, EVENT open-drain alert output with ARA support, one-shot conversion mode for ultra-low-power operation, and guaranteed accuracy over industrial temperature extremes.

Technical Context

The STTS751-0WB3F implements a sigma-delta ADC with digital post-processing to generate two's complement temperature values stored in 16-bit registers (split across high/low bytes). Its SMBus interface supports full protocol compliance-including WRITE/READ/SEND/RECEIVE byte commands, timeout (25–35 ms), and Alert Response Address (ARA) polling-enabling multi-device bus arbitration without address conflict.

Configuration is managed through dedicated registers: Configuration (0x03) controls resolution and standby mode; Conversion Rate (0x04) sets sample rates from 0.0625 to 32 Hz in powers-of-two steps; Status (0x01) reports conversion completion and alarm flags; and Therm limit/hysteresis (0x20/0x21) define hardware-triggered fan control thresholds independent of host polling.

Key Specifications

Pinout & Package

UDFN-6L (2 mm × 2 mm × 0.5 mm) package with wettable flanks, RoHS/green compliant, designed 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+, the STTS751-0WB3F uniquely combines SMBus ARA responsiveness, user-selectable slave addressing, and guaranteed ±0.5 °C accuracy across –40 °C to +125 °C-making it the only choice for fault-tolerant, multi-node thermal management in enterprise storage and computing platforms.

Availability

STTS751-0WB3F is available at Aetrix Electronics and suitable for solid state drives, notebook computers, and smart batteries requiring stable component supply, long-term lifecycle support, and RoHS/green compliance.

Supply support for STTS751-0WB3F 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

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

FAQ

What SMBus addresses does STTS751-0WB3F support?

The STTS751-0WB3F supports four SMBus slave addresses (1001000b, 1001001b, 0111000b, 0111001b) determined by the pull-up resistor value on the Addr/Therm pin. It belongs to the STTS751-0 family, distinct from STTS751-1 which uses 1001010b–0111011b. No external address pins or configuration registers are needed-address selection is purely resistor-based.

How does the EVENT pin function in alarm conditions?

The EVENT pin is an open-drain output that pulls low when the measured temperature exceeds the programmed high limit or falls below the low limit. It remains asserted until the condition clears and the status register is read. When used with SMBus ARA, the host polls address 0x0C (0001100b) and receives the STTS751-0WB3F's slave address in response-enabling automatic identification of which sensor triggered the alert on a shared bus.

Can STTS751-0WB3F operate in one-shot mode without continuous polling?

Yes. In standby mode, writing any value to the one-shot register (0x0F) initiates a single temperature conversion. Upon completion, the result updates the temperature register, triggers EVENT if limits are breached, and the device automatically re-enters standby-drawing only 3 μA. This eliminates background polling and reduces host firmware complexity for infrequent thermal checks.

What is the role of the Addr/Therm pin beyond address selection?

When configured as Therm output (via register bit), the Addr/Therm pin becomes an open-drain driver capable of sinking ≥4 mA. It can directly control external N-channel MOSFETs for fan activation or CPU clock throttling upon overtemperature detection-bypassing the host processor entirely. This provides hardware-fail-safe thermal response independent of software execution.