TO-247 Package: Complete Guide for Power Semiconductor Devices

Why It Matters

TO‑247’s superior thermal and electrical performance allows designers to push power density and efficiency, a critical advantage as electric vehicles and renewable energy systems scale rapidly.

Key Takeaways

• Handles 100A+ currents, up to 1700V.
• Low thermal resistance via large metal tab.
• 4‑pin Kelvin version reduces switching losses.
• Ideal for EV inverters and solar inverters.
• Supports SiC and GaN wide‑bandgap devices.

Pulse Analysis

Power electronics designers constantly wrestle with heat dissipation and reliability, especially as devices operate at higher currents and voltages. The TO‑247 package addresses these challenges by offering a substantially larger footprint than the TO‑220, coupled with a robust copper leadframe and a sizable metal tab that can be bolted directly to a heatsink. This architecture reduces junction‑to‑case thermal resistance, allowing devices to stay within safe temperature limits even under continuous 100 A operation, which is essential for high‑power converters and motor drives.

When compared to other common packages—such as DPAK, TO‑220, or TO‑264—the TO‑247 stands out for its balance of performance and cost. The 4‑pin Kelvin variant further trims parasitic inductance by providing a dedicated source connection, which translates into lower switching losses and higher efficiency in fast‑switching applications. This makes the package especially attractive for wide‑bandgap semiconductors like SiC MOSFETs and emerging GaN devices, where every nanosecond of transition time matters. Engineers also benefit from the package’s mechanical robustness, as through‑hole mounting secures the component against vibration in automotive and industrial environments.

Supply chain considerations are increasingly important as the demand for high‑power modules surges. While legacy TO‑247 parts may face longer lead times, the market now offers a growing portfolio of modern variants that cater to the efficiency targets of EV on‑board chargers and solar inverters. Designers should prioritize thermal interface materials, proper heatsink pressure, and PCB layout practices—such as short gate traces and thick copper planes—to fully exploit the package’s capabilities. As power density requirements continue to rise, the TO‑247 and its advanced versions will remain a cornerstone of next‑generation power electronics.