PFS35 Power SMD Film Resistors • • • • • • • • TO-263 Housing (D-Pak) Resistances from 0.01Ohm to 51kOhms Power Rating to 35Watt Resistance Tolerances to ±1% TCR to ±50ppm/K Load Stability to 1% Solder Reflow Secure at 260°C / 20s Isolated Back Plate SPECIFICATIONS Type PFS35 Terminals 2 Power Rating (with heatsink) 35 W ( 2W on Simple Solder Pad ) Thermal Resistance Rthj-c 3.3 K/W Resistance Range 0.01 to 0.099Ohms 0.1 to 9.9Ohms 10 to 51KOhms 5% 1% / 5% 1% ±250 ppm/K ±100 ppm/K ±50 ppm/K Tolerances (others upon request) Temperature Coefficient Operating Temperature -55°C to 155°C Max Operating Voltage 500V Voltage Proof 2.0kV DC Insulation Resistance Over 1,000 Megohm Resistor Material Thin Film Load Life ±1% 90 min ON, 30 min OFF, 1000 hrs @ 25C Humidity ±1% 90-95% RH, 0.1W, 1000 hrs @ 40C Temperature Cycle ±0.25% -55C for 30 min, +155C for 30 min, 5 cycles Solder Heat ±0.1% 350C ±5C for 3 seconds Vibration ±0.25% IEC60068-2-6 Reflow soldering lead-free soldering 260°C / 20s Ordering Information Part Number - Resistance - Tolerance PFS35 10 Ohms 1% Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 8/10 PFS35 Power SMD Film Resistors SPECIFICATIONS (continued) Derating Power (% from nominal power) Power Rating Notes - The PFS35 Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 175°C. To specify an appropriate heatsink use the following formula : 120 100 80 RqH = TMAX - ( P x RqR ) - TA P 60 40 20 0 25 50 85 100 115 130 145 155 Temperature of the backplate(°C) Where: RqH = Thermal Resistance of Heatsink ( K/W ) RqR = Thermal Resistance of Resistor ( K/W ) TMAX = Maximum Temperature of Resistor TA = Ambient Temperature of Heatsink ( °C ) P = Power Through Resistor ( W ) Dimensions Riedon Inc. Dimension mm tol. (±mm) inches tol. (±inches) A 10.3 0.2 0.405 0.008 B 10.1 0.2 0.400 0.008 C 15.3 1.0 4.54 0.04 D 5.08 0.1 0.200 0.004 E 1.5 0.05 0.060 0.002 F 0.75 0.05 0.030 0.002 G 2.2 0.2 0.087 0.008 H 4.5 0.2 0.177 0.008 J 0.5 0.05 0.020 0.002 K 2.5 0.5 0.10 0.02 L 5.0 1.0 0.20 0.04 300 Cypress Avenue Note: Back plate is isolated from both pins. Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 8/10