STMicroelectronics STTH20W02CW

Overview

STTH20W02CW from STMicroelectronics is a dual ultrafast high-voltage rectifier diode in TO-247 package, rated for 200 V repetitive peak reverse voltage and 2 × 10 A average forward current per diode at Tc = 120 °C. It features 20 ns typical reverse recovery time, 0.89 V typical forward voltage at 150 °C/10 A, and 4 °C/W junction-to-case thermal resistance per diode. It is engineered for secondary-stage DC/DC and DC/AC converters in MIG/MMA/TIG welding machines.

For engineers reviewing the STTH20W02CW datasheet, STTH20W02CW pinout, STTH20W02CW application, or STTH20W02CW equivalent, key selection criteria include ultrafast trr (20 ns typ), low VF (0.89 V @ 150 °C), dual-diode thermal coupling in TO-247, and ECOPACK®2 compliance for industrial power conversion designs.

Technical Context

The STTH20W02CW integrates two independent ultrafast silicon rectifiers on a single TO-247 substrate, sharing a common cathode (K) terminal and isolated anodes (A1, A2). Its Turbo 2 technology enables low QRR (150 nC typ) and soft recovery (Sfactor = 0.4), minimizing voltage overshoot and EMI in hard-switched topologies.

Thermal design leverages low Rth(j-c) = 4 °C/W per diode and total device Rth(j-c) = 2.5 °C/W, enabling high-power dissipation with conduction-cooled mounting. Dynamic performance is characterized at dIF/dt = –200 A/µs and VR = 160 V, supporting high-frequency switching up to 100 kHz in welder auxiliary supplies.

Key Specifications

Pinout & Package

Housed in ST's standard TO-247 package (4.46 g, UL94 V0 epoxy), the STTH20W02CW features three terminals: Cathode (K) as common return, and two isolated Anodes (A1, A2) for independent half-wave or dual-phase rectification paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast dual-diode rectifier applications.

Compared with MUR2020CT and VS-20CPH02-M3, the STTH20W02CW delivers the fastest trr (20 ns) and lowest VF (0.89 V) at elevated temperature, making it optimal for high-efficiency, high-density welder secondary stages where thermal and EMI constraints are tight.

Availability

STTH20W02CW is available at Aetrix Electronics and suitable for MIG/MMA/TIG welding machines, industrial DC/DC converters, and UPS battery chargers requiring stable component supply, long-lifecycle support, and ECOPACK®2-compliant sourcing.

Supply support for STTH20W02CW 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 industrial, automotive, and consumer markets.

The STTH20W02CW belongs to ST's Turbo 2 ultrafast diode product line, developed specifically for high-efficiency, high-reliability rectification in industrial power conversion systems operating above 50 kHz.

FAQ

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

The STTH20W02CW has a maximum operating junction temperature of 175 °C. Operating continuously at or near this limit accelerates dopant diffusion and increases leakage current over time. For 10-year field reliability, ST recommends maintaining Tj ≤ 150 °C using appropriate heatsinking and airflow-achievable via its 2.5 °C/W total Rth(j-c) and TO-247 mounting torque spec (0.55 N·m).

Can STTH20W02CW be used in parallel with another unit for higher current handling?

No-parallel operation of STTH20W02CW units is not recommended due to mismatched VF and trr characteristics causing current imbalance and thermal runaway. Instead, use its dual-diode architecture for current sharing within one package, or select a higher-rated single-die part like STTH30L06D for >20 A applications.

Is the TO-247 package electrically insulated, and what mounting considerations apply?

The TO-247 package has an electrically conductive metal tab (cathode K) that must be isolated from the heatsink using mica or ceramic washers unless the heatsink is floating. Mounting torque must be 0.55 N·m (max 1.0 N·m) to ensure mechanical stability and optimal thermal contact without cracking the epoxy body or deforming leads.

How does the softness factor (Sfactor = 0.4) impact EMI in welding inverters?

A softness factor of 0.4 indicates controlled, non-abrupt carrier removal during reverse recovery, which suppresses high di/dt-induced voltage spikes across transformer leakage inductance. This directly lowers broadband EMI amplitude (especially 30–300 MHz), reducing conducted emissions and easing compliance with CISPR 11 Class A limits in industrial welder designs.