STMicroelectronics STTH8L06FP

Overview

STTH8L06FP from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in TO-220FPAC package, rated for 600 V repetitive peak reverse voltage and 8 A average forward current at Tc = 125 °C. It features 75 ns typical reverse recovery time, 0.85 V typical forward voltage at 150 °C, and low thermal resistance (5 °C/W junction-to-case), optimized for boost diodes in discontinuous/critical-mode PFC circuits and freewheeling roles in switched-mode power supplies.

For engineers reviewing the STTH8L06FP datasheet, STTH8L06FP pinout, STTH8L06FP application, or STTH8L06FP equivalent, key selection criteria include ultrafast trr performance under high dIF/dt, low conduction loss at elevated junction temperature, insulation capability (2000 V DC), and thermal management in compact through-hole power designs.

Technical Context

The STTH8L06FP employs ST's Turbo 2 600 V technology to achieve soft-recovery characteristics with 75 ns typical trr and 7.2–10 A peak reverse recovery current (IRM) at 125 °C under 100 A/µs dIF/dt. Its low VF (0.85 V typ. @ 150 °C, 8 A) and low Rth(j-c) (5 °C/W) directly reduce both switching and conduction losses in high-frequency PFC stages.

Designed for operation up to 175 °C junction temperature and rated for 120 A non-repetitive surge current (tp = 10 ms), it supports robust thermal cycling in industrial and server-grade AC-DC front-ends. The TO-220FPAC package provides insulated mounting without external bushing while maintaining mechanical compatibility with standard TO-220 heatsinks.

Key Specifications

Pinout & Package

TO-220FPAC is a full-packaged, insulated variant of TO-220 with integral plastic barrier between tab and leads, rated for 2000 V DC isolation. Mounting torque: 0.4–0.6 N·m. Tab is cathode-connected; leads are anode (pin 1) and cathode (pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8L06FP, STTH8R06DJ offers superior thermal resistance but requires added insulation, while MUR860E trades higher conduction loss and undefined high-temperature leakage for marginally faster recovery-making STTH8L06FP optimal for thermally constrained, safety-certified PFC designs requiring integrated isolation.

Availability

STTH8L06FP is available at Aetrix Electronics and suitable for server AC-DC front-ends, industrial SMPS output rectification, and telecom rectifier modules requiring stable component supply, long-lifecycle assurance, and certified insulation performance.

Supply support for STTH8L06FP 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STTH8L06FP belongs to ST's Turbo 2 ultrafast rectifier product line, engineered specifically for high-efficiency, high-reliability power factor correction and switching power supply applications demanding low loss, soft recovery, and robust thermal performance.

FAQ

What is the maximum recommended mounting torque for the STTH8L06FP tab?

The STTH8L06FP datasheet specifies a recommended torque range of 0.4 N·m to 0.6 N·m for the mounting screw. Exceeding 0.6 N·m risks cracking the molded package or deforming the leadframe, compromising thermal contact and mechanical integrity. Use a calibrated torque screwdriver and verify flatness of the heatsink surface prior to installation.

Does the STTH8L06FP require a thermal pad or insulator when mounted to a heatsink?

Yes-the TO-220FPAC package integrates a molded insulating barrier between the metal tab and internal leads, rated for 2000 V DC isolation. No additional thermal pad or mica insulator is required; however, a thermally conductive but electrically insulating compound (e.g., silicone grease or phase-change pad) must be applied between tab and heatsink to ensure low Rth(j-hs) and prevent air gaps.

How does the STTH8L06FP's soft recovery behavior impact EMI in PFC designs?

The STTH8L06FP exhibits a softness factor >1.0 across its operating dIF/dt range (up to 200 A/µs), meaning reverse recovery current decays gradually rather than abruptly. This suppresses high-frequency ringing and voltage overshoot at the switch node, directly reducing conducted and radiated EMI-enabling smaller input filters and easing EMC certification in Class A/B power supplies.

Can the STTH8L06FP replace the STTH8L06D in the same PCB footprint?

No-the STTH8L06FP (TO-220FPAC) and STTH8L06D (TO-220AC) share identical lead spacing but differ in body height, tab thickness, and internal insulation structure. The FPAC variant has a taller profile and recessed leads; direct substitution risks insufficient creepage clearance, mechanical interference, and compromised thermal contact. A board redesign is required for replacement.