Power electronics board assemblies are central to modern vehicle power systems. They include voltage regulators, motor drivers, inverters, DC-DC converters, and onboard chargers, which are found across the range of today's vehicles, from conventional combustion engines to hybrids and full electric vehicles.
However, modern power PCBAs do far more than just route and manage electrical energy flow through the vehicle, converting and regulating power for everything from the starter and alternator to the traction motor. Today, they also carry the diagnostics, thermal monitoring, and real-time communications that keep that power flow safe and predictable under harsh ambient conditions.
This dual role drives the integration of complex, high-power components at unprecedented production volumes. When combined with a strict zero-tolerance policy for defects and rapid cycle times, these manufacturing factors make it essential to understand exactly where test strategies fall short and what it actually takes to close those gaps.
Why Automotive Power Electronics Boards Are Hard to Test
At automotive production volumes, a zero-defect mandate means test coverage can't be optional. Even a fraction of a percent in undetected defects translates into thousands of failed units once multiplied across the line, resulting in catastrophic field failures and costly recalls.
ower electronics board manufacturers typically detect defects using a sequential testing strategy: In-Circuit Test (ICT) verifies component placement, soldering integrity, and electrical continuity before the board is powered on, while Functional Test (FCT) applies input power, control signals, and varying loads to verify the board regulates power correctly and performs as intended under real operating conditions.
To continue reading this article, which appeared in the October 2026 SMT007 Magazine, click here.
