r se Is Tro h Ihg Prewo l wo Icudn Tecna xhr s re Ise k ye Ferutae S Resistances from 51k Ohms High Stability Film Resistance Elements Rated Power of 35, 50 and 100 Watts TO-220 and TO-247 Housing Resistance tolerance of 0.1% or 1% Low Inductance of < 10nH for RHXH1 and RHXH2, <50nH for RHXH3 a noitacilpp S Power Inverters Engine Sensors Power Supplies Temperature Sensors p tcudor Syrammu 3 RESISTANCE RANGE () POWER RATING (W) PRODUCT SERIES THERMAL 1 2 (RHX) MIN MAX HEATSINK FREE AIR RESISTANCE TOLERANCES 1% ( R0.1 ) RHXH1 0.02 51K 35 1 3.3C/W 5% 1% ( R0.1 ) RHXH2 0.02 51K 50 1 2.3C/W 5% 1% ( R0.10 ) RHXH3 0.02 51K 100 3 1.3C/W 5% 1 Power Rating based on 25C Flange Temperature 2 Power Rating based on 25C Ambient Temperature 3 Contact Factory for Higher or Lower Values a Velbalia o noitp S (Consult Factory) TEMPERATURE COEFFICIENTS: Special Testing Requirements 50ppm/C ( R10 ) 100ppm/C ( 0.1 R < 10 ) 250ppm/C ( R < 0.1 ) Hwo ot o redr RHX H2 Q 038K0 F 4 RESISTOR HIGH POWER PACKAGE CODE TEMPERATURE COEFFICIENT RESISTANCE TOLERANCE PACKING LOW INDUCTANCE OF RESISTANCE (TCR) H1, 35W, TO-220 Q = 50ppm/C 0R038 = 0.038 F = 1.0% (R 0.1) 4 = Tube N = 100ppm/C 003K8 = 3.8K H2, 50W, TO-220 J = 5.0% K = 250ppm/C 038K0 = 38.0K H3, 100W, TO-247 380K0 = 380.0K 003M8 = 3.8M Letter denotes decimal place. 3 6 R = decimal., K 10 , M 10 Remaining 4 digits are significant or placeholders. Tin/Lead coated leads, add- P on part number. Standard Termination Finish: Matte Tin (Sn) Example P/N: RHXH2Q038K0F4 is Resistor High Power Low Inductance, 50W TO-220, 50ppm/C, 38.0K, 1.0%, tube 50 www.johansondielectrics.comr se Is Tro h Ihg Prewo l wo Icudn Tecna xhr s re Ise e n Vlatnemnori c Hiretcara Scit S Electrical Characteristics RHXH1 & RHXH2 Values RHXH3 Value Maxiumum Current 25A - Inductance <10nH ( At the Standoff ) - Insulation Resistance >1000 Megohm >1000 Megohm Dielectric Strength 2000 VAC 2500 VAC Temperature Range -55C to +155C -55C to +155C Maximum Working Volt- (500V MAX) 700 V or , whichever is less age Power Derating Curve 120 100 80 60 40 20 0 -25 0 25 50 75 100 125 150 175 Backplate Temperature (C) RHXH1 & RHXH2 POWER RATING NOTES: RHXH3 POWER RATING NOTES: H1 and H2 High Power Low Inductance Resistors must H3 High Power Low Inductance Resistors must be be attached to a suitable heatsink. Without a heatsink, attached to a suitable heatsink. the maximum power rating is 1W. The maximum internal resistor temperature is 155C. The maximum internal resistor temperature is 155C. Use the following formula to specify appropriate Use the following formula to specify an appropriate heatsink: heatsink: Where: R = Thermal Resistance of Heatsink ( C/W ) qH R = Thermal Resistance of Resistor ( C/W ) qR T = Maximum Temperature of Resistor ( C ) MAX T = Ambient Temperature of Heatsink ( C ) A P = Power Through Resistor ( W ) 51 www.johansondielectrics.com Rated Power ( % )