STMicroelectronics STTH3L06S

Overview

STTH3L06S from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in SMC package, rated for 600 V repetitive peak reverse voltage and 3 A average forward current, with 60 ns typical reverse recovery time and 0.85 V typical forward voltage at 150 °C - optimized as a boost diode in discontinuous/critical-mode PFC circuits and freewheeling diode in switch-mode power supplies.

For engineers reviewing the STTH3L06S datasheet, STTH3L06S pinout, STTH3L06S application, or STTH3L06S equivalent, key selection criteria include ultrafast soft recovery (60 ns trr), low thermal resistance (20 °C/W junction-to-lead), platinum-doped low leakage (<100 µA at 150 °C), and SMC surface-mount compatibility for high-density power stage layouts.

Technical Context

This device implements ST's Turbo 2 600 V technology, featuring platinum diffusion to suppress minority carrier lifetime and enable controlled soft recovery - critical for reducing EMI and voltage overshoot in high-frequency PFC and flyback topologies. Its 175 °C maximum junction temperature supports operation in thermally constrained industrial and server power designs.

The SMC package provides 20 °C/W junction-to-lead thermal resistance and supports 60 A non-repetitive surge current, enabling robust transient handling in power supply output stages where fast switching and thermal cycling are routine.

Key Specifications

Pinout & Package

The STTH3L06S is housed in an SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. Cathode is marked by a band on the body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast high-voltage rectifier applications.

Compared with MUR360SM and VSKY360, STTH3L06S delivers superior thermal performance (20 °C/W j-l), lower forward voltage at elevated temperature (0.85 V vs. ≥1.05 V), and tighter reverse recovery consistency - making it optimal for high-efficiency, high-reliability PFC and SMPS output stages where board space and thermal headroom are constrained.

Availability

STTH3L06S is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, telecom power shelves, and LED driver secondary rectification requiring stable component supply and long-term manufacturability.

Supply support for STTH3L06S 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.

The STTH3L06S belongs to ST's Turbo 2 ultrafast rectifier product line, engineered specifically for high-frequency, high-efficiency power conversion in PFC and SMPS applications where soft recovery, thermal robustness, and long-term reliability are essential.

FAQ

What is the maximum junction temperature and how does it affect reliability?

The STTH3L06S has a maximum junction temperature of 175 °C. This rating enables reliable operation in high-ambient environments such as enclosed server PSUs or industrial enclosures, where thermal design margins are tight. Operating consistently below this limit extends lifetime per Arrhenius models, and the platinum-doped junction ensures leakage remains stable up to 150 °C junction temperature.

Is STTH3L06S suitable for synchronous rectification replacement?

No - STTH3L06S is a unidirectional silicon PN rectifier, not a MOSFET-based synchronous rectifier. It can replace Schottky diodes in 600 V applications where higher voltage rating is needed, but cannot be actively controlled like a synchronous FET. Its ultrafast soft recovery makes it appropriate for quasi-resonant or fixed-frequency flyback outputs where gate drive complexity must be avoided.

How does the SMC package compare thermally to DO-201AD and SMB variants?

The SMC package offers 20 °C/W junction-to-lead thermal resistance - identical to DO-201AD but superior to SMB (25 °C/W). Its larger copper area and shorter internal leads improve heat transfer to the PCB. Unlike DO-201AD (through-hole), SMC supports automated assembly and higher power density, making it preferred for modern high-volume SMPS designs.

Does STTH3L06S require a heatsink in typical applications?

Not typically - with 20 °C/W junction-to-lead resistance and 3 A average current, the STTH3L06S dissipates ~2.6 W at 150 °C junction. Using ≥1 cm² of 35 µm copper on the cathode pad achieves ~45 °C/W junction-to-ambient, keeping Tj <125 °C at 50 °C ambient - sufficient for most 24 W–48 W power stages without added heatsinks.