MLCC Aging and De-Aging: Capacitance After Reflow and Referee Time
An MLCC that measures higher after reflow has not gained permanent capacitance. For a high-permittivity ferroelectric dielectric, a heat history...
Parameters
How to Read MOV TOV Data: Temporary Withstand Is Not MCOV
If a datasheet states 1.25 per unit for 1 second, the duration and voltage reference are part of the rating....
Why Does Ferrite-Bead Impedance Fall Under DC Bias?
A ferrite bead can remain below its catalog current rating and still provide less useful impedance than the filter design...
Does an NTC Inrush Limiter’s Cold Resistance Predict Its Steady-State Voltage Drop?
Does the 5 Ω, 10 Ω, or 20 Ω printed in an NTC inrush-current limiter's datasheet predict the voltage it...
Why Are GDT DC and Impulse Sparkover Voltages Different?
Why can one gas discharge tube (GDT) have a DC sparkover voltage and a substantially higher impulse sparkover voltage? The...
Can an MOV AC MCOV Be Calculated Directly From Its DC Rating?
No. Dividing a metal oxide varistor's maximum DC operating voltage by √2 does not create an allowable AC rating. The...
How Should MOV Leakage Current Be Read From a Datasheet?
A leakage-current figure in an MOV datasheet is easy to misuse. A few microamperes can look like a fixed property...
Why an MOV Joule Rating Cannot Be Compared Without the Waveform
Two MOVs carry the same joule rating. Does that mean they can absorb the same surge and be exchanged directly?...
How Should MOV Temperature Derating Be Applied?
Learn how to apply MOV temperature derating to operating voltage, surge current, energy and average power without misreading the operating...
Can an MOV Single-Pulse Surge Rating Be Used for Repetitive Pulses?
Learn why an MOV single-pulse surge rating is not a repetitive-duty guarantee and how to read pulse-count, waveform, interval, and...
