High Voltage

Thick Film Resistors

SQP Series

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)

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Overload (10 x 5s at 6.25 x Pr not exceeding 2 x LEV)

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Damp heat steady state (56 days, 40˚C,

90% RH)

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Climatic sequence

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Climatic category

55/155/56

Temperature rapid change

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Resistance to solder heat

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Vibration

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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