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VRW25 Datasheet(PDF) 2 Page - Welwyn Components Limited

Part No. VRW25
Description  High Voltage Thick Film Resistors
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Maker  WELWYN [Welwyn Components Limited]
Homepage  http://www.welwyn-tt.com/
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VRW25 Datasheet(HTML) 2 Page - Welwyn Components Limited

   
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High Voltage
Thick Film Resistors
SQP Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue C · 07.06
Welwyn Components
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Load at rated voltage (1000hrs at 70˚C)
4
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0
5
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1
%
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5
5
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Overload (10 x 5s at 6.25 x Pr not exceeding 2 x LEV)
5
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1
%
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Damp heat steady state (56 days, 40˚C,
90% RH)
1
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5
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1
%
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Climatic sequence
2
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%
R
Climatic category
55/155/56
Temperature rapid change
5
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%
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Resistance to solder heat
5
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%
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Vibration
5
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71
Maximum peak voltage in accordance with “IEC 60065 chapter 14.1”
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
Application Notes
1. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An
estimate of the temperature rise to be expected at the center of the body can be calculated using the
thermal impedance figures given under Electrical Data.
2. VRW resistors can be supplied with radial, goalpost or lancet pre-formed leads. The VRW37 is also
available in an SMD format with Z formed leads and packed in blister tape. Consult Factory for details.
Packaging
Our standard packaging for VRW is taped and
boxed. The critical dimensions are shown in
Figure 1. The component wires will not
protrude beyond the outside edge of the
tapes. Alternative packaging is available by
request. Pre-formed resistors are supplied
loose packed in plastic bags or boxes.
Performance Data
Pulse Performace
Figure 1
6
mm
2
f
1
f
6
mm
5
mm
Body location f1-f2
1.4mm
1
10
100
0.01
0.1
1
10
100
Megaohms
VRW25
VRW37
VRW Series
Pulse Performance
Vmax (kV)
52mm
Overload (10 x 5s on, 45s off at 6.25 x Pr not exceeding 2 x LEV)
2
Issue B · 01.07


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