STE transist surge protector zinc metal oxide varistor surge arrestor surge absorber 20D821K varistor

For the 2mS waveform:J=2*Ip* Vc*10-3  For the 10/1000μS  waveform:

J=1391*Ip* Vc*10-6          Where  J -- Energy absorbed in joules.

Ip -- Maximum let-through current in amps.Vc-- Measured clamping voltage in volts.

 6.MaximumPeak current : The maximum current within the varistors voltage change of ±10% with the standard impulse current (8/20μS) applied one time. 

7. Capacitance: Typical value measured at 1Vrms and test frequency of 1kHz.

 8.Solderability: After dipping the terminals to a depth of  3.5-0.5 mm from the body in a soldering bath of temperature 235℃±5℃for 2± 0.5seconds, the terminal shall be visually examined.

9.Resistance to Soldering heat: After each lead shall be dipped into a solder bath having a temperature 260℃±5℃,to a point 2.0 to 2.5mm from the body of the unit. Using shielding Board(t=1.5mm) ,be held there for specified time(5D series: 5±1 seconds and other series:10 s ),and then be stored at room temperature and humidity for 1 to 2 hours. The change of V1mA and mechanical damages are examined.

10.Solvent resistanceof marking:Solvent: alcohol  Rubbing material: cotton wool Recovery: 4hours.

Thereafter, visual examination and the change of  V1mA  shall be examined.