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Power MOSFET data sheets include a safe operating area (SOA) graph with a family of curves to make sure the device can be operated at current and voltage conditions in an application without being damaged. Proper use of SOA data is a critical design element for reliable system operation.
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Power MOSFETs are used in applications where voltage and current stresses may exceed their capabilities leading to long term reliability concerns and/or catastrophic failures. This article will review the SOA graph in the MOSFET data sheet and show how it is used to ensure safe operation of the FET in an application without damaging it.