STMicroelectronics STTH8R06G

Overview

STTH8R06G from STMicroelectronics is a 600 V, 8 A ultrafast high-voltage rectifier diode in D²PAK (TO-263) package, optimized for continuous-conduction-mode PFC boost stages and hard-switching SMPS applications. It delivers typ. 1.4 V forward voltage at 125 °C, 25 ns max reverse recovery time, and 5.5 A peak reverse recovery current under 400 V/−200 A/µs conditions.

For engineers reviewing the STTH8R06G datasheet, STTH8R06G pinout, STTH8R06G application, or STTH8R06G equivalent, key selection criteria include ultrafast trr performance, low thermal resistance (R_th(j-c) = 2.2 °C/W), soft recovery behavior (S factor = 0.3), and suitability for high-efficiency AC-DC front-end designs requiring reduced switching losses and EMI control.

Technical Context

The STTH8R06G employs ST's Turbo 2 silicon technology to achieve ultrafast reverse recovery with controlled softness-critical for minimizing voltage overshoot and ringing in high-dV/dt boost converters. Its dynamic parameters are characterized at T_j = 125 °C, IF = 8 A, VR = 400 V, and dIF/dt = −200 A/µs.

Thermal design is enabled by low junction-to-case resistance (2.2 °C/W) and a copper-tab D²PAK package rated for 30 A RMS forward current. The device operates up to 175 °C junction temperature and exhibits stable leakage (<400 µA at 125 °C, VR = 600 V).

Key Specifications

Pinout & Package

D²PAK (TO-263) surface-mount package with isolated copper tab (pin 1 = anode, pin 2 = cathode, tab = cathode). Requires minimum 100 mm² 2-oz copper pad for thermal performance.

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, the STTH8R06G provides superior thermal performance in surface-mount form factor, tighter trr control, and documented soft recovery-making it optimal for high-density, high-efficiency, and EMI-sensitive PFC designs where PCB real estate and thermal headroom are constrained.

Availability

STTH8R06G is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, server telecom rectification, and LED driver front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STTH8R06G 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 STTH8R06G belongs to ST's Turbo 2 ultrafast diode product line, engineered specifically for high-efficiency, high-frequency PFC and SMPS applications demanding low Q_rr, soft recovery, and robust thermal performance.

FAQ

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

The STTH8R06G has a maximum junction temperature of 175 °C. This allows operation in high-ambient environments like enclosed LED drivers or industrial PSUs. To maintain T_j ≤ 175 °C, the PCB copper pad must provide ≤2.2 °C/W thermal resistance from junction to case, typically achieved with ≥100 mm² of 2-oz copper connected directly to the cathode tab.

How does the softness factor of 0.3 improve system reliability?

A softness factor of 0.3 indicates highly controlled, gradual current decay during reverse recovery-reducing di/dt-induced voltage spikes across circuit stray inductance. This suppresses ringing on the boost switch node, lowers EMI filter requirements, and decreases stress on the PFC MOSFET's drain-source insulation, extending long-term reliability in high-power applications.

Can STTH8R06G replace STTH8R06D in existing TO-220AC designs?

No direct drop-in replacement: STTH8R06G uses D²PAK (TO-263) surface-mount packaging versus TO-220AC's through-hole format. Mechanical mounting, thermal interface, and PCB layout differ significantly. Migration requires redesign of the copper pour, pad stack, and thermal relief-though electrical characteristics (V_RRM, I_F(AV), t_rr) are identical.

What is the significance of Q_rr = 150 nC in PFC efficiency calculations?

Q_rr = 150 nC represents the total charge recovered during reverse turn-off. In a 100 kHz PFC stage, this contributes ~15 mW of switching loss per diode (P_sw ≈ Q_rr × V_R × f_sw). Compared to diodes with Q_rr > 250 nC, the STTH8R06G reduces this loss by >40%, directly improving full-load efficiency by 0.2–0.3% in typical 2–5 kW systems.