1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than

4mm from the body.

2. 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.

3. WP-S resistors can also be supplied with radial, goalpost or lancet pre-formed leads. WP2S, WP3S, WP4S and WP5S are also

available in an SMD format with Z formed leads and packed in blister tape. Consult factory for details.

Application Notes

Radial

Goalpost

Lancet

Z-form

Compact Flameproof Power

Wirewound Resistors

WP-S Series

Welwyn Components

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue E · 07.06

The standard packaging for WP-S is taped. The critical dimensions are shown in Figure 1. The component wires will not

protrude beyond the outside edge of the tapes. Taped product is then packed into boxes or onto reels; see Ordering Procedure

for details. Alternative packaging is available by request. Pre-formed resistors are supplied loose packed in plastic bags or boxes.

Packaging

Dimensions (mm)

b

c

WP1S

52

5

WP2S

52

5

WP25S

52

5

WP3S

67

10

WP4S

63

10

WP5S

63

10

WP7S

85

10

Figure 1

66

C

b

f1

f2

Body location f1 - f2

1.4mm

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