STMicroelectronics STTH8S06FP

Overview

STTH8S06FP from STMicroelectronics is an ultrafast 600 V, 8 A high-voltage rectifier diode in insulated TO-220FPAC package, fabricated using Pt-doped planar technology for hard-switching PFC and DC/DC converter stages. It delivers 12 ns max reverse recovery time, 1.5 V typical forward voltage at 150 °C, and 2000 VRMS insulation rating - enabling high-efficiency telecom/server power supplies with reduced MOSFET switching losses.

For engineers reviewing the STTH8S06FP datasheet, STTH8S06FP pinout, STTH8S06FP application, or STTH8S06FP equivalent, key selection criteria include reverse recovery charge (90 nC at 125 °C), thermal resistance (5.5 °C/W junction-to-case), softness factor (0.3 at 125 °C), and ECOPACK2 compliance for environmentally constrained deployments.

Technical Context

This diode operates as a unidirectional, single-anode/cathode ultrafast rectifier optimized for discontinuous and continuous conduction mode PFC stages and secondary-side synchronous rectification in isolated DC/DC converters. Its Pt-doping process ensures tightly controlled carrier lifetime, yielding low Qrr and IRM while maintaining high VRRM and Tj = +175 °C capability.

Dynamic performance is characterized under standardized conditions: trr measured at IF = 1 A, dIF/dt = −200 A/µs, VR = 30 V (12–18 ns); IRM and Qrr tested at IF = 8 A, VR = 200 V, dIF/dt = −200 A/µs - confirming suitability for 100–500 kHz switching topologies with minimal tail current.

Key Specifications

Pinout & Package

STTH8S06FP uses the insulated TO-220FPAC package: 3-terminal, epoxy-molded, UL 94 V0 rated, with electrically isolated tab (2000 VRMS) and 12 pF package capacitance. Mounting torque: 0.55 N·m recommended.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06DJ and MUR860E, STTH8S06FP uniquely combines reinforced insulation, sub-15 ns trr, and 90 nC Qrr - making it the only option qualified for compact, high-frequency, safety-critical telecom/server front-end rectification without design compromises.

Availability

STTH8S06FP is available at Aetrix Electronics and suitable for telecom AC-DC front-end modules, server board-level DC/DC converters, and industrial 48 V backup power supplies requiring stable component supply, long-term lifecycle support, and certified insulation integrity.

Supply support for STTH8S06FP 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 silicon solutions for automotive, industrial, and power management applications.

STTH8S06FP belongs to ST's high-voltage ultrafast diode product line, engineered specifically for high-efficiency, high-reliability power conversion in telecom infrastructure and datacenter power systems.

FAQ

What is the maximum allowable case temperature for STTH8S06FP during continuous operation?

The device has a maximum junction temperature of +175 °C and a junction-to-case thermal resistance of 5.5 °C/W. Assuming 8 A average forward current and 1.5 V forward drop, power dissipation is ~12 W. With 5.5 °C/W Rth(j-c), case temperature rise is ~66 °C above ambient - so continuous operation is viable up to +109 °C case temperature (175 − 66) if ambient remains ≤109 °C.

Can STTH8S06FP replace STTH8S06D in existing designs?

Yes, but with mechanical and thermal considerations: STTH8S06FP uses insulated TO-220FPAC (2000 VRMS, Rth(j-c) = 5.5 °C/W), while STTH8S06D uses non-insulated TO-220AC (Rth(j-c) = 3.0 °C/W). The FP variant requires no insulating washer but needs higher thermal budget; layout must accommodate different leadframe geometry and tab isolation.

How does the softness factor of 0.3 affect EMI in high-frequency PFC circuits?

A softness factor of 0.3 indicates highly damped reverse recovery behavior - meaning IRM decays rapidly with minimal oscillation. This suppresses high-frequency ringing (>100 MHz) in boost diode voltage waveforms, reducing conducted EMI in the 30–108 MHz CISPR-22/32 band and easing filter design in 300–500 kHz telecom PFC stages.

Is STTH8S06FP suitable for use in synchronous rectification topologies?

No - STTH8S06FP is a unidirectional PN junction diode, not a MOSFET-based synchronous rectifier. It serves as a freewheeling or output rectifier in non-synchronous topologies (e.g., flyback, forward, boost PFC). For synchronous rectification, discrete MOSFETs or integrated SR controllers (e.g., STSR3) are required.