STMicroelectronics STTH100W04CW

Overview

STTH100W04CW from STMicroelectronics is a dual-die ultrafast high-voltage rectifier diode in TO-247 package, rated for 400 V repetitive peak reverse voltage, 100 A total average forward current (2 × 50 A per die), and 35 ns typical reverse recovery time. It is engineered for secondary-stage DC/DC and DC/AC conversion in MIG/MMA/TIG welding machines, where low thermal resistance (0.4 °C/W total junction-to-case) and robust ribbon bonding ensure reliability under high-current, high-temperature operation.

For engineers reviewing the STTH100W04CW datasheet, STTH100W04CW pinout, STTH100W04CW application in welding power supplies, or STTH100W04CW equivalent high-voltage ultrafast rectifiers, this page delivers verified electrical parameters, thermal behavior, real-world conduction loss modeling, and validated alternative options for industrial power conversion design.

Technical Context

The STTH100W04CW integrates two independent 400 V, 50 A ultrafast diodes in a single TO-247 package with shared case thermal path. Its Turbo 2 silicon technology enables soft reverse recovery (S-factor = 0.3) and low IRM (20 A typ. at dIF/dt = −200 A/µs), minimizing voltage overshoot and EMI in hard-switched converters.

Thermal design is enabled by low Rth(j-c) = 0.4 °C/W (total) and coupling resistance Rth(c) = 0.1 °C/W between dies, allowing accurate junction temperature estimation when both dies operate simultaneously using P(diode 1) × 0.7 + P(diode 2) × 0.1 + ambient.

Key Specifications

Pinout & Package

Housed in ST's standard TO-247 package with three terminals: two anodes (A1, A2) and one shared cathode (K). The package features insulated mounting hole, epoxy meeting UL94 V0, and recommended torque of 0.55 N·m (max 1.0 N·m).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR100E40CT and VS-100CTH04-M3, the STTH100W04CW offers superior thermal integration (dual die, 0.4 °C/W), faster recovery (35 ns), and proven softness (S-factor = 0.3), making it uniquely suited for high-dI/dt, space-constrained welding and inverter applications demanding low EMI and high reliability.

Availability

STTH100W04CW is available at Aetrix Electronics and suitable for MIG/MMA/TIG welding power supplies, industrial DC/DC converters, and renewable energy inverters requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STTH100W04CW 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 consumer markets.

The STTH series belongs to ST's high-voltage power diode product line, specifically developed for high-efficiency, high-reliability rectification in demanding industrial power conversion systems including welding, UPS, and renewable inverters.

FAQ

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

The STTH100W04CW has a maximum junction temperature (T_j(max)) of 175 °C. This rating allows operation at elevated ambient temperatures when paired with appropriate heatsinking. Using the total R_th(j-c) of 0.4 °C/W, designers can calculate allowable power dissipation as (175 − T_c) / 0.4. For example, at T_c = 100 °C, up to 187.5 W may be dissipated across both dies - sufficient for full-rated 100 A conduction with realistic VF and duty cycle.

How is conduction loss calculated for this dual-die rectifier?

Conduction loss is modeled per diode using P = 0.85 × I_F(AV) + 0.007 × I_F(RMS)², as specified in the datasheet. Since the device contains two independent dies, total loss equals the sum of losses in each active die. At 50 A average per die and sinusoidal current waveform, RMS current is ~70.7 A, yielding ~5.4 W per die (10.8 W total), assuming typical VF and thermal conditions.

Does the STTH100W04CW support paralleling of the two internal dies?

Yes - the two dies share only the cathode (K) terminal and case thermal path; anodes A1 and A2 are fully isolated. This allows independent control (e.g., interleaved drive) or parallel connection for enhanced current capacity. Thermal coupling via R_th(c) = 0.1 °C/W must be accounted for in junction temperature calculation when both dies conduct simultaneously.

What mechanical mounting considerations apply to the TO-247 package?

The TO-247 package uses an insulated mounting hole with recommended torque of 0.55 N·m (maximum 1.0 N·m). Exceeding torque risks cracking the epoxy or damaging internal bonds. Mounting surface flatness and thermal interface material selection are critical - uneven surfaces or poor TIM contact degrade the effective R_th(j-c), potentially causing premature thermal runaway under high-current operation.