Why Can a GDT Keep Conducting After a Surge?
A gas discharge tube (GDT) can finish diverting the specified surge and still remain conductive. Once the tube has fired...
Wiki
Structured technical references for electronic components, covering parameters, operating principles, test conditions, reliability, selection and cross-reference evaluation, with a focus on MLVs, MOVs, thermistors and safety capacitors.
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...
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....
How Should the Third Lead of a Thermally Protected MOV Be Wired?
The third lead on a thermally protected metal oxide varistor (MOV) often invites the wrong first question. Designers ask whether...
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...
Why Do MOV Leads and PCB Traces Increase Residual Voltage?
Why can the voltage at a protected circuit exceed the metal oxide varistor (MOV) clamping voltage in the datasheet? 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...
