Nexperia Packaging & Thermal Management Solutions

Wide-bandgap solutions for SCWT

Short-Circuit Withstand Time (SCWT) is the duration for which a power semiconductor device can safely withstand a short-circuit event without damage. While device ruggedness is often evaluated using static and dynamic parameters (such as RDS(on) variation with temperature, body diode behaviour, threshold voltage stability and immunity to parasitic turn-on), the ability to endure fault conditions is equally important. Among these fault scenarios, short-circuit capability is particularly critical, as such events can rapidly cause device failure or even destruction.

During a short-circuit event, a device experiences extreme current and power dissipation within a very short time frame. This can result in rapid self-heating and severe electrical and thermal stress, quickly pushing the device beyond its safe operating limits. SCWT tests measure the duration a device can withstand a short-circuit condition before failing. Accurately characterising SCWT is essential not only to understanding device robustness but also to guiding system-level protection design and ensuring the safe operation of demanding applications with stringent fault-tolerance requirements. Making SCWT a fundamental parameter in evaluating the overall ruggedness of power devices for automotive applications, industrial drives and renewable energy systems.

SCWT is particularly important in systems with high voltages and currents, such as motor drives, inverters, automotive powertrains, industrial control systems, and renewable energy converters. In these environments, short-circuit events can occur due to control faults, load failures or unexpected operating conditions. Devices with high SCWT provide a critical time window for protective circuits to respond and shut down the device, thereby preventing catastrophic failures and ensuring continuous operation.

As a result, SCWT has become a key metric for evaluating the overall ruggedness of modern power devices, particularly wide-bandgap technologies such as silicon carbide (SiC) MOSFETs. Understanding how device design, and particularly packaging, affects short-circuit behaviour is therefore vital for both device selection and robust system design.

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