STMicroelectronics STTH8R06FP

Overview

STTH8R06FP from STMicroelectronics is a 600 V, 8 A ultrafast high-voltage rectifier diode in TO-220FPAC package, optimized for continuous-conduction-mode (CCM) PFC boost stages and hard-switching SMPS applications. It delivers 25 ns max reverse recovery time, 1.4 V typical forward voltage at 125 °C, and 5.5 A typical peak reverse recovery current under 400 V/200 A/µs conditions.

For engineers reviewing the STTH8R06FP datasheet, STTH8R06FP pinout, STTH8R06FP application, or STTH8R06FP equivalent, key selection criteria include ultrafast trr performance under high dIF/dt, low thermal resistance (4.6 °C/W junction-to-case), and validated operation up to 175 °C junction temperature in isolated-mount configurations.

Technical Context

The STTH8R06FP employs ST's Turbo 2 silicon process to achieve soft reverse recovery with S factor ≥0.3 and Qrr = 150 nC, minimizing voltage overshoot and EMI in high-frequency switching converters. Its design targets high-efficiency AC-DC front-ends where low conduction loss (VF = 1.4 V @ 8 A, 125 °C) and fast turn-off (trr ≤ 25 ns @ 25 °C) are critical.

Thermal performance is defined by Rth(j-c) = 4.6 °C/W for TO-220FPAC, requiring direct heatsink mounting via insulated tab. The device supports surge currents up to 80 A (10 ms sine) and operates across -65 °C to +175 °C storage and junction temperature ranges.

Key Specifications

Pinout & Package

STTH8R06FP uses the TO-220FPAC package: a full-packaged, insulated-tab variant of TO-220 with creepage/clearance enhanced for 2000 VRMS isolation. Mounting requires torque of 0.55 N·m (max 0.7 N·m) on M3 screw.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D, STTH8R06FP trades 2.4 °C/W higher thermal resistance for 2000 VRMS isolation-critical in medical and industrial safety-critical designs-while matching core electrical specs. Against STTH12R06DJ, it offers tighter trr control at lower current, favoring high-frequency, low-EMI PFC implementations.

Availability

STTH8R06FP is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, EV on-board chargers, and medical imaging systems requiring stable component supply and certified isolation compliance.

Supply support for STTH8R06FP 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 automotive, industrial, and consumer markets.

The STTH series belongs to ST's high-voltage power diode product line, engineered specifically for energy-efficient AC-DC conversion in PFC, SMPS, and inverter applications demanding ultrafast recovery and robust thermal performance.

FAQ

What is the maximum recommended mounting torque for STTH8R06FP?

The STTH8R06FP TO-220FPAC package specifies a recommended torque of 0.55 N·m for the M3 mounting screw, with an absolute maximum of 0.7 N·m. Exceeding this risks cracking the epoxy body or deforming the insulated tab, compromising both mechanical integrity and 2000 VRMS isolation rating.

Does STTH8R06FP require a heatsink in all applications?

Yes-STTH8R06FP must be mounted to a heatsink via its insulated tab to maintain Tj ≤ 175 °C. At 8 A average current and 1.4 V forward drop, conduction loss exceeds 11 W; without heatsinking, junction temperature would exceed safe limits within seconds even at room ambient.

How does the softness factor (S ≥ 0.3) impact circuit design?

A softness factor ≥ 0.3 indicates gradual current decay during reverse recovery, reducing di/dt-induced voltage overshoot across parasitic inductances. This lowers EMI filter requirements and eliminates need for snubbers in many 65–100 kHz PFC designs, simplifying layout and bill-of-materials.

Can STTH8R06FP replace STTH8R06 in existing TO-220AC designs?

No-STTH8R06FP uses TO-220FPAC (insulated tab), while STTH8R06 uses TO-220AC (conductive tab). Direct replacement requires verifying heatsink isolation, adjusting mounting hardware, and revalidating thermal performance due to higher Rth(j-c) (4.6 vs. 2.2 °C/W).