STMicroelectronics STTS424BDN3F

Overview

STTS424BDN3F from STMicroelectronics is a JEDEC JC42.4-compliant digital temperature sensor IC designed for DIMM module thermal monitoring in laptops and servers. It features 0.25°C typical resolution, ±1°C accuracy from +75°C to +95°C, 2.7–3.6 V supply operation, and an open-drain EVENT alert output for alarm window or critical trip detection.

For engineers reviewing the STTS424BDN3F datasheet, STTS424BDN3F pinout, STTS424BDN3F application, or STTS424BDN3F equivalent, this page delivers verified technical context, JEDEC-aligned register behavior, SMBus/I²C timing compliance, and DIMM-specific configuration capabilities - all grounded in the official STMicroelectronics specification.

Technical Context

The STTS424BDN3F integrates a bandgap-based temperature sensing element with a 10-bit sigma-delta ADC, delivering digitized temperature data in °C format with no external calibration required. Its pointer-register architecture supports read-only, write-only, and read/write registers including capability, configuration, temperature, and programmable trip-point registers (upper/lower alarm, critical).

It operates as an SMBus/I²C slave device with fixed DTI code '0011' and user-configurable A0–A2 address pins enabling up to eight devices on one bus. The device supports bus timeout (25 ms default), does not initiate clock stretching, and provides active-low open-drain EVENT output configurable in comparator or interrupt mode.

Key Specifications

Pinout & Package

STTS424BDN3F uses a 2 mm × 3 mm TDFN8 package (JEDEC MO-229 WCED-3 compliant) with maximum height of 0.80 mm, optimized for space-constrained DIMM PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar JEDEC JC42.4 temperature sensor applications.

Compared with MAX6605AESA+ and LM75BIMMX/NOPB, STTS424BDN3F uniquely delivers JEDEC JC42.4 register alignment, ±1°C high-accuracy zone, and dual-mode EVENT output - making it the only choice for standards-compliant DIMM thermal management requiring firmware interoperability and hardware alert flexibility.

Availability

STTS424BDN3F is available at Aetrix Electronics and suitable for laptop memory modules, server RDIMMs, and industrial DDR3/DDR4 thermal monitoring applications requiring stable component supply and long-lifecycle support.

Supply support for STTS424BDN3F 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, specializing in microcontrollers, sensors, power management, and automotive ICs.

STTS424BDN3F belongs to ST's JEDEC-compliant memory thermal sensor product line, engineered specifically to meet the accuracy, packaging, and register interface requirements of DDR3/DDR4 DIMM modules in computing and server platforms.

FAQ

What is the default I²C address of STTS424BDN3F and how is it configured?

The STTS424BDN3F has a fixed 4-bit Device Type Identifier (DTI) of '0011'. Its full 7-bit slave address is formed by appending the A2/A1/A0 pin states, yielding addresses from 0x30 to 0x37. All three address pins are hardwired inputs - no internal address register exists, and configuration occurs solely through external VDD/VSS connections.

Does STTS424BDN3F support clock stretching on the I²C bus?

No. STTS424BDN3F explicitly does not initiate clock stretching, as confirmed in Section 3.1 of the official datasheet. This ensures deterministic timing behavior and compatibility with hosts that do not support stretched clocks, such as many baseboard management controllers (BMCs) and microcontrollers with simplified I²C peripherals.

How is hysteresis implemented and what values are selectable?

Hysteresis is implemented in hardware and applied to the EVENT output to prevent oscillation near trip thresholds. Four discrete values are selectable via the Configuration Register: 0°C, 1.5°C, 3°C, or 6.0°C. The setting applies uniformly to upper alarm, lower alarm, and critical trip events - no per-threshold hysteresis configuration is supported.

Can STTS424BDN3F measure temperature in Fahrenheit natively?

No. The STTS424BDN3F outputs temperature exclusively in degrees Celsius, calibrated and formatted per JEDEC JC42.4. Fahrenheit conversion must be performed externally in host firmware using the formula °F = (°C × 9/5) + 32 or a precomputed lookup table - no onboard conversion logic or register option exists.