WMO-S Series
Application Notes
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 can be calculated using the thermal impedance figures given under Electrical Data.
3. WMO-S resistors can also be supplied with radial, goalpost or lancet pre-formed leads. Consult Factory for details.
Radial
Goalpost
Lanset
Packaging
Our standard packaging for WMO-S 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. Pre-formed resistors are supplied loose packed in plastic bags or boxes.
Dimensions mm
WMO�½S
WMO1S
WMO2S
WMO3S
WMO5S
A
B
52
5
52
5
Figure 1
52
5
67
10
85
10
B
6
f
1
A
f
2
6
Body location f1-f2 < 1.4mm
Ordering Procedure
Specify type reference, value and tolerance as shown in this example of WMO3S at 1.5K
W
, 5%:
T ype
Value (use IE C62 code)
T olerance (use IE C 62 code)
J 5%
P acking Code
W MO 3 S 1 K 5 J A 1
A5
A1
A05
Ammo
Pack
WMO
1 2
S
WMO1S, WMO2S, WMO3S
WMO5S
5000 / Box
1000 / Box
500 / Box
© 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 A . 11.06
WELWYN [ WELWYN COMPONENTS LIMITED ]
