STMicroelectronics STTH8S06B-TR

Overview

STTH8S06B-TR from STMicroelectronics is an ultrafast 600 V, 8 A high-voltage rectifier diode based on Pt-doped planar technology, designed for hard-switching PFC stages and DC/DC converters in telecom/server power supplies. It delivers typ. 1.5 V forward voltage at 8 A and 150 °C, 12 ns max reverse recovery time, and 2000 VRMS insulation in its insulated TO-220FPAC variant - though this part uses DPAK (TO-252) package for surface-mount integration in high-density SMPS.

For engineers reviewing the STTH8S06B-TR datasheet, STTH8S06B-TR pinout, STTH8S06B-TR application, or STTH8S06B-TR equivalent, key selection criteria include reverse recovery charge (Qrr = 90 nC @ 125 °C), softness factor (0.3), thermal resistance (Rth(j-c) = 4.5 °C/W for DPAK), and ECOPACK2 compliance for RoHS/REACH-constrained industrial designs.

Technical Context

This diode operates as a unidirectional, non-controlled power rectifier optimized for high-frequency switching (>100 kHz) where low trr and minimal IRM reduce MOSFET switching losses in boost PFC and synchronous rectification topologies. Its Pt-doping enables stable junction behavior up to +175 °C junction temperature and low thermal resistance.

The DPAK (TO-252) package provides surface-mount compatibility with low-profile mounting, 0.35 g mass, and thermal performance validated for FR4 PCBs with copper area ≥10 cm². Unlike TO-220 variants, it lacks internal insulation but offers superior board-level thermal coupling via exposed cathode pad.

Key Specifications

Pinout & Package

STTH8S06B-TR uses the DPAK (TO-252) surface-mount package with three terminals: Cathode (large exposed pad), Anode (lead), and auxiliary Cathode (second lead). The exposed cathode pad serves as primary thermal path and electrical connection point.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D and MUR860E, STTH8S06B-TR uniquely combines DPAK surface-mount compatibility, sub-15 ns t_rr, and 90 nC Q_rr at 125 °C - making it the only option among the three qualified for compact, high-efficiency 200+ kHz telecom PFC stages without thermal compromise.

Availability

STTH8S06B-TR is available at Aetrix Electronics and suitable for telecom AC-DC front-ends, server VRM input stages, and on-board DC/DC converters requiring stable component supply, RoHS-compliant packaging, and high-reliability surface-mount rectification.

Supply support for STTH8S06B-TR 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

STTH8S06B-TR belongs to ST's STTH ultrafast diode product line, engineered specifically for high-efficiency, high-frequency power conversion in telecom infrastructure and datacenter power supplies where low Q_rr and thermal robustness are critical.

FAQ

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

The STTH8S06B-TR has a maximum rated junction temperature of +175 °C. At this limit, the device maintains full electrical specifications including 600 V V_RRM and 8 A I_F(AV). Operating continuously at T_j = 150 °C reduces expected lifetime by ~50% versus 125 °C, per Arrhenius model; derating curves in DS5643 show 8 A rating holds up to 135 °C case temperature with adequate PCB copper.

Is the DPAK package insulated like the TO-220FPAC version?

No. The STTH8S06B-TR in DPAK (TO-252) has no internal insulation - the cathode pad is electrically connected to the silicon die. Unlike the TO-220FPAC variant (2000 V_RMS isolation), this part requires external creepage/clearance compliance via PCB layout. Its 12 pF package capacitance applies only to the insulated TO-220FPAC version.

How does softness factor impact EMI in high-speed PFC designs?

A softness factor (S-factor) of 0.3 means the diode exhibits sharp, non-oscillatory turn-off with minimal current tail. In 70–300 kHz PFC stages, this reduces high-frequency voltage spikes across the MOSFET, lowering conducted EMI by 8–10 dB in the 30–100 MHz band and relaxing filtering requirements for EN 55032 Class B compliance.

Can STTH8S06B-TR replace STTH8S06FP in existing designs?

No direct replacement: STTH8S06FP uses insulated TO-220FPAC (2000 V_RMS, 5.5 °C/W R_th(j-c)) while STTH8S06B-TR uses non-insulated DPAK (4.5 °C/W, no isolation). Swapping requires PCB redesign for thermal pad layout, removal of insulating hardware, and verification of creepage distances - not a drop-in change.