Plain-language answer: Self-resonant frequency is where a component’s intended reactance is canceled by its parasitic capacitance or inductance.
Why the real component differs from the ideal
Above SRF, an inductor can behave capacitively and a capacitor inductively, invalidating simple component calculations.
What to verify
Keep the operating range appropriately below SRF unless the design intentionally uses the resonance, and measure in the real fixture.
The common mistake
Assuming a labeled component behaves ideally at any frequency.
Component boundary
Use frequency-specific ratings and the exact topology, material, geometry, load, power, duty cycle, and cooling. Begin at low power and stop for heating, odor, arcing, distortion, or unstable measurements.
