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| Cement Coated Surface Mount Wirewound Resistors WA80Z Series Welwyn Components * * * * * * All welded construction Suitable for automatic pick and place Excellent pulse handling capability Fuses safely under fault conditions Competitive cost Performance equivalent to 2, 3 & 5W axial resistors Electrical Data WA83Z Power rating at 25C Resistance range Limiting element voltage Isolation voltage TCR Resistance tolerance Standard values Ambient temperature range C watts ohms volts volts ppm/C % 2 0R05 to 900R 50 250 <20R: 5, 10 WA84Z 3 0R01 to 2K2 100 350 1R0:350 >1R0:200 20R: 1, 2, 5, 10 E24 series preferred -55 to 155 WA85Z 5 0R015 to 6K8 150 500 Physical Data Dimensions (mm) Type WA83Z WA84Z WA85Z L 13.40.2 18.70.2 18.70.2 W 3.6 max 5.2 max 7.0 max H 6.25 max 6.9 max 7.9 max l 9.0 max 14.5 max 16.5 max w 4.50.6 6.50.6 6.50.6 d 0.8 nom 0.8 nom 0.8 nom d w H L I W Recommended Pad Sizes Dimensions (mm) Type WA83Z WA84Z WA85Z A 5.5 7.5 min 7.5 min B 2.5 min 2.5 min 2.5 min C 10 max 15 max 15 max D 15 min 20 min 20 min B A C D 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 and lead forming. 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 G * 03.06 (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 Cement Coated Surface Mount Wirewound Resistors WA80Z Series Marking WA83Z and WA84Z resistors R10 and above are marked with four colour bands in conformance with IEC62. Values below R10 are marked with three bands (two digits and tolerance); there is no multiplier band. WA85Z resistors are legendmarked "WA85" plus resistance value and tolerance in conformance with IEC62. Welwyn Components 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 under any condition of applied temperature or component overload. Performance Data Maximum Load at rated power: 1000hrs @ 25 or 70C Dry heat: 1000hrs @ 200C Short term overload Derating from rated power @ 25C Climatic Climatic category TRC & Vibration Robustness & solder heat Long term damp heat Temperature rise Pulse handling R% R% R% 5 +0.001 5 +0.001 5 +0.001 See Graph 1 See Graph 2 R% 5 +0.001 55/200/56 1 1 1 R% R% R% 5 +0.001 5 +0.001 5 +0.001 Zero at 155C 2 Typical 3 3 1 Note: Testing was performed on FR4 test boards measuring 50mm x 50mm, with 1oz/ft2 (300g/m2) copper pads. The track area close to each pad was 120mm2. If a lower grade of PCB or less track area is used, derating of the power may be necessary. Temperature Rise Graph 1 260 240 220 200 180 160 WA80Z Thermal Performance Temp Rise (K) 140 120 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 Power (W) 3 3.5 4 4.5 5 WA83Z Hot Spot WA83Z Joint WA84Z Hot Spot WA84Z Joint WA85Z Hot Spot WA85Z Joint (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 G * 03.06 Cement Coated Surface Mount Wirewound Resistors WA80Z Series Welwyn Components Pulse Handling The graph below shows the energy handling capability of CSM resistors for single short pulses (<100mS). For longer pulses of duration up to 5 Seconds, up to 5 times the rated power may be applied. Note that forced-air cooling and heatsinking by PCB tracks have no effect on energy ratings. If higher energy ratings than those shown are needed, it is normally possible to design a pulse withstand variant. Graph 2 100 WA80Z Energy Capability Graph 10 Energy (Joules) 1 0.1 0.01 0.1 1 10 Value (Ohms) 100 1000 10000 WA83Z WA84Z WA85Z Packaging CSM products are supply on standard carrier tape and 330mm diameter reels suitable for automatic pick and place machines. Carrier tape dimensions and standard reels quantities are given below. Dimensions (mm) Type WA83Z WA84Z WA85Z Ao 5.3 7.3 7.4 Bo 13.9 19.2 19.2 Ko 6.3 7.1 8.2 W 24 32 32 P 12 12 12 T 0.4 0.4 0.4 Quantity Per reel 750 750 650 o 13mm Ao Bo P Ko o 330mm Ordering Procedure Specify type reference, value and tolerance as shown in this example of WA84Z at 1.5KOhms 5%: Type Value (use IEC 62 code) Tolerance (use IEC 62 code) F G J K 1% 2% 5% 10% WA84Z 1K5 J W All other dimensions as per EIA481 standard 24mm / 32mm (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 G * 03.06 |
Price & Availability of WA80Z
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