Resistors Heatsink Mount High Power Resistors WMHP Series TO-220 & TO-247 standard power packages Very low thermal resistance Non-inductive thick film technology 20 to 100 watt high power resistors Single screw mounting to heatsink Suitable for high frequency / fast pulse use All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2) Electrical Data WMHP20 WMHP35 WMHP50 WMHP100 Conditions Package style TO-220 TO-247 Power rating watts 20 35 50 100 Heatsink with 25C flange temperature Power rating watts 1.5 2.5 3 3.5 Without heatsink, in free air 25C Limiting element voltage volts 350 700 dc or ac rms Resistance range ohms R05 10K Dielectric strength volts 1800 ac rms for 60s Working temperature range C -65 to 150 -65 to 175 Insulation resistance ohms >10G Between terminals and tab Tolerances % 1R0: 5 >1R0: 1, 5 TCR ppm/C R20: 1000 >R203R0: 300 >3R0-10R: 100 >10R: 50 25 to 105C Standard values E24 preferred Physical Data Dimensions (mm) & Weight (g) TO-220 TO-247 A 10.16 0.25 15.75 0.26 B 15 0.3 20.7 0.26 C 4.6 0.2 4.95 0.26 D 3.85 0.15 3.63 0.1 E 13.75 0.5 14.48 1.27 F 4 max 2.79 0.76 G 5.08 0.25 3.63 0.18 H 0.78 0.08 1.52 0.1 J 1.3 0.1 10.16 0.26 K 6.4 0.25 5.33 0.26 L 0.51 0.15 0.81 0.26 M 2.27 0.25 2.41 0.26 TO-220 TO-247 Wt 2.0 nom 3.7 nom Performance Data Test Performance Load at Rated Power: 2000hrs at rated power R% 1 Short Term Overload: 2 x rated power with applied voltage not to exceed 1.5 x maximum continuous operating voltage for 5 seconds R% 0.5 Damp Heat with Load: 40 2C, 90 95% RH, maximum working voltage 1.5 hours on, 0.5 hours off, 1000 hours R% 1 Thermal Shock: -65C/150C, 100cycles R% 0.3 Terminal Strength: 2.4N pull test R% 0.2 General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com TT Electronics plc 04.16Resistors Heatsink Mount High Power Resistors HHHHeaeaeaeattttssssinkinkinkink MMMMooooununununtttt HHHHigigigigh h h h PPPPoooowwwwerererer RRRResesesesisisisisttttoooorrrrssss HHHHeaeaeaeattttssssinkinkinkink MMMMooooununununtttt HHHHigigigigh h h h PPPPoooowwwwerererer RRRResesesesisisisisttttoooorrrrssss WMHP Series WMHP Series WMHP Series Temperature Derating Mounting Temperature Derating The resistor should be mounted to a heatsink using a suitable thermal interface material. The maximum tightening torque for the M3 mounting screw is 0.9Nm. TO-220 TO-247 TO-220 TO-247 Pulse Performance Typical High Frequency PerformTypainccael High Frequency Performance Pulse Performance Single Pulse (P << P ) Condition mean r Single Pulse (P << P ) Condition mean r 1000 WMHP100 100 WMHP50 WMHP35 WMHP20 10 0.1 1 10 100 1000 10000 100000 Pulse Duration (ms) Pulse performance for durations 1s is dependent on mounting conditions. The short term Pulse performance for durations 1s is dependent on mountingTy cpiocnadil hitigoh nsfr. Teqheue snchoyr ct thaerrmac teristics for WMHP35-220R. Self resonant frequency is 1GHz. Typical high frequency characteristics for WMHP35-220R. Self resonant frequency is 1GHz. overload power limit is 2 x power rating for 5s. overload power limit is 2 x power rating for 5s. Ordering Procedure Ordering Procedure Example: WMHP35-10KJ (WMHP35 at 10 kilohms 5%, Pb-free) Example: WMHP35-10KJ (WMHP35 at 10 kilohms 5%, Pb-free) General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com www.ttelectronicsresistors.com www.ttelectronicsresistors.com TT Electronics plc 04.16 Peak Power (W)