STMicroelectronics STTH60SW03CW

Overview

STTH60SW03CW from STMicroelectronics is a dual common-cathode ultrafast recovery rectifier in TO-247 package, rated for 300 V repetitive peak reverse voltage and 60 A total average forward current (30 A per diode), with typical forward voltage drop of 0.94 V at 150 °C and 30 A, and 25 ns typical reverse recovery time at 25 °C. It is engineered for secondary-side rectification in high-power DC/DC and DC/AC converters used in MIG/MMA/TIG welding machines.

For engineers reviewing the STTH60SW03CW datasheet, STTH60SW03CW pinout, STTH60SW03CW application, or STTH60SW03CW equivalent, key selection criteria include dual-diode thermal coupling behavior, junction-to-case thermal resistance of 0.9 °C/W (total), softness factor of 0.3, and conduction loss modeling via P = 0.85 × IF(AV) + 0.010 × IF²(RMS).

Technical Context

This device integrates two independent ultrafast silicon rectifiers in a single TO-247 package with shared cathode terminal, enabling synchronous secondary-side rectification in phase-shifted full-bridge or dual-active-bridge topologies. Its 25 ns trr (typ.) and 0.3 softness factor minimize switching noise and EMI during turn-off in high-dI/dt environments.

Thermal design leverages low Rth(j–c) of 1.5 °C/W per diode and 0.9 °C/W total, with coupling resistance of 0.3 °C/W between diodes-critical for accurate junction temperature estimation when both diodes conduct simultaneously under asymmetric load conditions.

Key Specifications

Pinout & Package

Housed in ST's standard TO-247 package with three terminals: two anodes (A1, A2) and one common cathode (K). The package uses epoxy meeting UL94 V0, supports conduction cooling, and requires mounting torque of 0.8 N·m (max 1.0 N·m).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH60SW03CW, STTH60W03C offers identical performance in a different packaging format, while MBR6030CT trades higher temperature capability for lower forward drop-making it viable only in thermally relaxed environments.

Availability

STTH60SW03CW is available at Aetrix Electronics and suitable for MIG welding inverters, TIG DC power supplies, MMA rectifier modules, and industrial DC/DC converter secondary stages requiring stable component supply and long-term manufacturing continuity.

Supply support for STTH60SW03CW 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series targets high-reliability power conversion in harsh thermal environments, with STTH60SW03CW specifically optimized for high-current, high-temperature rectification in welding equipment and industrial power supplies.

FAQ

What is the maximum junction temperature and how is it enforced?

The absolute maximum operating junction temperature is +175 °C, validated per Table 2 of the datasheet. This limit is enforced through thermal design using the specified Rth(j–c) = 0.9 °C/W (total) and monitoring case temperature at the mounting surface. Exceeding this temperature risks irreversible degradation of the epitaxial layer and bond wire integrity.

Can STTH60SW03CW replace a single 60 A fast recovery diode?

No-it is a dual 30 A common-cathode device, not a single 60 A diode. Replacing a single-diode solution requires verifying that both anodes can be independently driven and that the shared cathode routing accommodates the system's grounding and layout constraints without introducing parasitic inductance or thermal imbalance.

How does the softness factor affect circuit design?

A softness factor of 0.3 means the diode exhibits moderate dI/dt-dependent tail current decay, reducing voltage overshoot and EMI generation during turn-off. This allows smaller snubber capacitors and less aggressive gate drive damping in adjacent MOSFETs, particularly beneficial in high-dI/dt welding inverter outputs.

Is the TO-247 package lead-free and RoHS compliant?

Yes-STTH60SW03CW carries ECOPACK®2 certification, confirming full compliance with RoHS Directive 2011/65/EU and halogen-free requirements. The package uses lead-free terminations and UL94 V0-compliant epoxy, with no exemptions applied.