Electronic components- Voltage Dependent Resistor VDR varistor
Type MYG Varistors are made of semiconductor ceramic materials composed mainly of zinc oxide. They have non-linear resistance that change as a function of applied voltage. It has small size, high current capacity, and high protection level.
PRODUCT:HEL7D121K
Varistor voltage(V1mA):120V/108V-132V
Maximum Allowable voltage:75VAC/100VDC
Maximum Clamping voltage:200V
Withstanding Surge Current(8/20us):1200A/1 time
Rated Wattage(W):0.25W
Energy(2ms):5J
Typical Capacitance:670PF
Ordering Notes:
1. Ceramic Disc: Zinc Oxide Varistor
2. Material of coating: Epoxy resin
3. Material of Leads: CP wire
4. Lead type: Straight lead
5. Package: Bulk pack
Recongnized Certificate:
Function:
Producing Process
Technical Data:
1. Varistors Voltage: The voltage between two terminals with the specified measuring current 1mA DC applied is called V1mA,The measurement shall be made as fast as possible to avoid heat affection.
4.Clamping Voltage:The peak voltage at class current (Standard surge currentwaveform is 8/20μS). The class current is a peak value of current which is1/10 of the maximum peak current for 100 impulses at per minute for 8/20μS.
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.
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