VDR Varistor
25D SERIES
METAL OXIDE VARISTOR – 20D J2 & J3 SERIES
* Wide operating voltage (V1mA) range from 18V to 1800V.
* Fast responding to transient over-voltage.
* Large absorbing transient energy capability.
* Low clamping ratio and no follow-on current.
* Meets MSL level 1, per J-STD-020
* Safety number : UL- E317616
ISO9001-2018
*Transistor, Diode, IC, Thyristor or Triac semiconductor protection.
* Surge protection in consumer electronics.
* Surge protection in industrial electronics.
* Surge protection in electronic home appliances, gas and petroleum appliances.
* Relay and electromagnetic valve surge absorption.
*Operating Temperature:
*Storage Temperature:
*Working Surface Temperature:
*Insulation Resistance:
*Coating (Epoxy Resin):
*Coating:
FEATURES
APPLICATION
General Characteristics Definition
(-40
℃
~ +85
℃
)
(-40 C ~ +125 C)
+115 C
> 100M
Ω
Flame-Retardant to UL 94 V-0
o
o
o
Material
Epoxy Resin
The Copper Wire
Silver
Solder
Zinc Oxide
*Lead Wire:
*Electrode:
*Disk:
PART NUMBER CODE
VDR
Brand Mark
□□
D
□□□
K
□
Sapce:Straight 85℃
H:125℃
C:Crimped , Y:Y kink
I:Inner,Tor G :Plaster
□□
Element Diameter
Type: D: Disk , S: Square
Varistor Voltage
Tolerance : K±10%, L±15%
Short leg : NO :
Lead Form :
E: 4KV2KA S:6KV/3KA Y:10KV/5KA
=ABCDEF Times
J2&J3:High Surge & High Energy
PH=Ultra Surge
Taping : TA : Ammo, TR : Reel
□.□
□
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Mechanical Ratings
Reliability Test
VDR Varistor
25D SERIES
Test Parameter Test Condition / Description
Diameter
Terminal Pull
Strength
After gradually applying the load specified below and keeping
the unit fixed for ten seconds, the terminal shall be visually
examined for any damage.
0.6mm
0.8mm
1.0mm
The unit shall be secured with its terminal kept vertical and the
weight specified below be applied in the axial direction. The
Terminal Bending
terminal shall gradually be bent by 90° in one direction, then 90°
Strength
in the opposite direction, and again back to the original position.
The damage of the terminal shall be visually examined.
Diameter
0.6mm
0.8mm
1.0mm
Loading
1.0 Kg
1.0 Kg
2.0 Kg
Loading
0.5 Kg
0.5 Kg
1.0 Kg
Performance
Requirements
No visible damage
No visible damage
Vibration
The Specimen shall be vibrated by its lead wires with a total amplitude of 1.5㎜ and a
varying frequency of 10~55~10HZ(each minutes) for a period of 2 hours respectively in
each X,Yand Z directions.
No visible damage
△VB/VB%≦±5%
Soldering-
solderability
Soldering-
Resistance to
Solder Heat
After dipping the terminal to depth of approximately 3㎜ from the specimen in a soldering
Terminations shall
bath of 260℃ for 10±1(D5: 5±1) seconds. Thereafter the terminal shall be visually
be uniformly tinned
examined.
After preheating the specimen, the specimen shall be completely immersed into a
soldering bath having a temperature of 260±5℃ for 10±1 (D5: 5±1) seconds or iron of
400±5℃ for 3±0.5 seconds. There after the change of Vb and mechanical damage shall
be examined.
No visible damage
△VB/VB%≦±5%
ENVIRONMENTAL RATINGS
The specimen shall be applied continuously the maximum allowable voltage at the
specified conditions for specified period and then stored at room temperature and normal
humidity over 2 hours. Thereafter, the change of Vb and mechanical damage shall be
Dry Heat Loading
△VB/VB%≦±10%
examined.
Ambient
temp：125±2℃ ;
Period：1000±24hours.
High Temperature In a drying oven without load.
Storage
Ambient temp：125±2℃ ; period：1000±24hours
△VB/VB%≦±5%
Damp Heat
Loading
The specimen shall be applied continuously the maximum allowable voltage at the
specified conditions for specified period and then stored at room temperature and normal
humidity over 2 hours. Thereafter, the change of Vb and mechanical damage shall be
△VB/VB%≦±10%
examined.
Ambient
condition：40±2℃ , 90 to 95%R.H. ; period：1000±24 hours
Step
Temp C
-40+3
o
C
Room Temp
85+2 C
Room Temp
o
o
Period
30 min.
15 min.
30 min.
15 min.
No visible damage
△VB/VB%≦±10%
No Breakdown
No visible damage
△VB/VB%≦±10%
Temperature
Cycle
Condition the specimen to each temperature form step 1
to step 4 in this order for the period shown in the table of
specifications. The change of Vb and mechanical
damage shall be examined after 2 hours.
1
2
3
4
Surge Lifetime
Rating
Voltage Proof
The change of Vb shall be measured after the impulse listed below is applied 10,000
times continuously with the interval of ten seconds at room temperature.
Voltage：2500VAC
Leakage Current≦0.5mA
Time：60 Seconds
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