STMicroelectronics STTH8S06D

Overview

STTH8S06D from STMicroelectronics is a 600 V, 8 A ultrafast high-voltage rectifier diode in TO-220AC package, featuring Pt-doped planar technology for hard-switching PFC and DC/DC converter applications. It delivers trr(max.) = 12 ns, VF(typ.) = 1.5 V at 150 °C, IF(AV) = 8 A, and Tj(max.) = +175 °C - enabling high-efficiency telecom power supplies.

For engineers reviewing the STTH8S06D datasheet, STTH8S06D pinout, STTH8S06D application, or STTH8S06D equivalent, key selection criteria include reverse recovery time under dIF/dt = −200 A/µs, junction-to-case thermal resistance (Rth(j-c) = 3.0 °C/W), softness factor (Sfactor = 1 at 25 °C), and ECOPACK2 compliance for environmentally constrained designs.

Technical Context

This ultrafast diode uses platinum diffusion to control carrier lifetime, achieving low Qrr (17 nC at 25 °C) and minimal IRM (1.6–2.2 A) during reverse recovery. Its planar junction structure ensures stable trr across temperature and load, critical for synchronous rectification in high-frequency SMPS.

The TO-220AC package provides direct heatsink mounting with Rth(j-c) = 3.0 °C/W and mechanical torque spec of 0.55 N·m. With VR = 600 V and IF(AV) = 8 A, it operates reliably in continuous conduction mode (CCM) PFC stages where low conduction loss and fast turn-off reduce MOSFET switching stress.

Key Specifications

Pinout & Package

TO-220AC package: insulated plastic body with metal tab (cathode), three leads - anode (A), cathode (K), and isolated tab (K). Mounting torque: 0.55 N·m recommended; UL 94 V0 epoxy.

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, STTH8S06D offers the lowest combined conduction–switching loss profile in 600 V/8 A class, validated for 300–1000 kHz telecom PFC and requiring no snubber redesign.

Availability

STTH8S06D is available at Aetrix Electronics and suitable for telecom power supplies, on-board DC/DC converters, and server power equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STTH8S06D 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 industrial, automotive, and communications markets.

STTH8S06D belongs to ST's STTH ultrafast diode product line, engineered specifically for high-efficiency, high-frequency power conversion in telecom and datacenter infrastructure where low Qrr and tight trr distribution are mandatory.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH8S06D supports continuous operation with case temperature up to 100 °C, derived from its IF(AV) = 8 A rating at Tc = 100 °C and Rth(j-c) = 3.0 °C/W. At higher case temperatures, derating is required per Figure 1 in DS5643; junction temperature must remain ≤ +175 °C.

Is the TO-220AC package electrically insulated?

No - the TO-220AC package has an electrically conductive metal tab connected to the cathode. Unlike TO-220FPAC, it lacks internal insulation; isolation requires external insulating hardware (e.g., mica washer + nylon screw) when mounting to grounded heatsinks.

How does softness factor affect circuit reliability?

A softness factor of 1 (at 25 °C) indicates a gradual reverse recovery current decay, minimizing voltage spikes and EMI. This reduces stress on gate drivers and eliminates need for RC snubbers in most 300–500 kHz PFC designs, improving long-term reliability in telecom rectifiers.

Can STTH8S06D replace STTH8S06FP in the same footprint?

No - STTH8S06D (TO-220AC) and STTH8S06FP (TO-220FPAC) have different pinouts and thermal structures. TO-220FPAC includes internal insulation (2000 VRMS) and higher Rth(j-c) = 5.5 °C/W; mechanical mounting and PCB layout are incompatible without redesign.