EMI/EMP Filter Connectors Catalog - Glenair, Inc.

Workshop with Serge GigawattWhen specifying transient voltagesuppression for a given lightningstrike waveform (or “shape”) andlevel (or magnitude), diodes must becompatible with EMI filter dielectricwithstanding voltage (DWV) rating.Diode power is rated in wattsfor a given pulse shape and pulseduration. Typically the referencevalues are given for a 10/1000μspulse. This means that the diodecan absorb the peak power ratedfor a pulse with 10μs rise time and1000μs fall time. If the systemis subjected to a different pulseshape or duration the value must beadjusted accordingly. The table onthe following page does just thatfor RTCA D0/60 lightning strike.For high speed applications, diode capacitance andtrace inductance are critical. Glenair engineers will recommenda suitable design for each application. This mayinvolve using extremely compact surface mount diodeswithin the pin field of the connector, as shown below.Since lightning strikes can be positively ornegatively charged, special bi-directional diodesare available. If a system does not already havetransient suppression diodes somewhere “in the box,”Glenair can include diodes on EMI filtered or nonfilteredconnectors.