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Compact Flameproof Power Wirewound Resistors
WP-S Series
Welwyn Components
* * * * *
Small size for power rating Enhanced pulse handling capability Flameproof protection SMD Z-form available RoHS compliant with Pb-free terminations
Electrical Data
WP1S Power rating at 25C 5s overload rating at 25C Short pulse performance Resistance range Limiting element voltage TCR Isolation Voltage Resistance Tolerance Standard Values Thermal Impedance Ambient temperature range C/watt C 140 110 90 ohms volts ppm/C volts % 250 <20R: 5 20R: 1, 2, 5 E24 preferred 82 -55 to +155 62 54 35 R068 to 430R 50 R05 to 900R 50 watts watts 1 5 WP2S 2 10 WP25S 2.5 12.5 WP3S 3 15 WP4S 4 20 WP5S 5 25 WP7S 7 35
See Pulse Performance graphs R05 to 900R R01 to 2K2 75 <1R: 350 350 100 1R: 200 500 Physical Data
Dimensions (mm) & Weight (g) Type L max D max f min d nom PCB mount centres 10.20 12.70 18.40 20.30 0.8 18.90 22.86 31.40 1.2 Min bend radius 0.6 Wt. nom 0.22 0.50 0.50 1.10 1.00 1.75 4.40
D
WP1S WP2S WP25S WP3S WP4S WP5S WP7S
6.2 9.0 12.5 14.5 13 16.5 25.0
2.8 3.6 4.5 5.2 5.6 7.0 8.8
21.20 19.80 17.80 24.55 22.75 23.55 28.30
0.6
d
L
f
Construction
A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive element is wound on the substrate and welded to the caps. Flameproof silicone cement coating is applied prior to marking with indelible ink. The components are then leadformed if required and packed.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue E * 07.06
(c) 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
Compact Flameproof Power Wirewound Resistors
WP-S Series
Welwyn Components
Terminations
Material: Strength: Solderability: Hot tin dipped copper wire The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
Marking
WP1S, WP2S, WP25S and WP3S resistors R10 and above are marked with four or five colour bands in conformance with IEC62. Values below R10 are marked with three bands (two digits indicating value in milliohms, and tolerance); there is no multiplier band. WP4S, WP5S and WP7S resistors are legend marked with type reference, resistance value and tolerance.
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.
Performance Data
Maximum Load at rated power: 1000hrs @ 25C Dry heat: 1000hrs @ 200C Short term overload (5 x Pr for 5s) Derating from rated power @25C Climatic Climatic category TRC & Vibration Robustness & solder heat Long term damp heat (56 days) Typical Change 3 3 1 Zero at 280C 2 55/200/56 1 1 1
R% R% R% R% R% R% R%
5 +0.001 5 +0.001 5 +0.001 5 +0.001 5 +0.001 5 +0.001 5 +0.001
Pulse Performance
The pulse energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at 25C.
WP-S Short Pulse Energy Capacity 100
Energy (joules)
10
WP5S
WP7S
1
WP25S WP2S
WP4S WP3S
0.1 0.1 1 10 100 Value (ohms)
(c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
WP1S
1000
10000
Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com
Issue E * 07.06
Compact Flameproof Power Wirewound Resistors
WP-S Series
Welwyn Components
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 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. Radial Goalpost Lancet Z-form
Packaging
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.
Figure 1
Dimensions (mm) WP1S WP2S WP25S WP3S WP4S WP5S WP7S b 52 52 52 67 63 63 85 c 5 5 5 10 10 10 10
C
f1 6
b
f2 6
Body location f1 - f2 < 1.4mm
(c) 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 E * 07.06
Compact Flameproof Power Wirewound Resistors
WP-S Series
Welwyn Components
Ordering Procedure
Example: WP2S at 680 ohms and 5% tolerance in ammo pack box of 2500 pieces Type Value (use IEC 62 code) Tolerance (use IEC 62 code)
F G J 1% 2% 5%
WP2S
-
680R
J
A25
Packing
A5 A25 A15 A1 A1 T075 T07 Tape Tape Ammo WP1S WP2S WP25S WP3S WP4S WP5S WP7S 5000/box 2500/box 1500/box 1000/box 1000/box 700/reel 700/reel Standard
(c) 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 E * 07.06

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