PF2470 Series TO-247 Power Film Resistors • TO-247 Housing • Rated Power to 140 Watts • Resistances from 0.02 to 51K Ohms • High Stability Film Resistance Elements • Resistance Tolerance to ±1% • Low Inductance ( <50nH ) • Excellent Pulse Handling • Isolated Back Plate SPECIFICATIONS Power Rating Thermal Resistance Range3 Temperature Type Tolerances Heatsink1 Free Air2 Resistance Min Max Coefficients ±50ppm/°C ( R≥10W ) ±1% ( R≥0.10W ) PF2473 140W 5W 0.9°C/W 0.02W 51KW ±100ppm/°C ( 0.1W ≤ R < 10W ) ±5% ±250ppm/°C ( R < 0.1W ) ±50ppm/°C ( R≥10W ) ±1% ( R≥0.10W ) PF2472 100W 3W 1.3°C/W 0.02W 51KW ±100ppm/°C ( 0.1W ≤ R < 10W ) ±5% ±250ppm/°C ( R < 0.1W ) 1 Power rating based on 25°C Flange Temperature 2 Power rating based on 25°C Ambient Temperature 3 Consult Factory for Higher or Lower Values Specification Value Temperature Range -55°C to +175°C Dielectric Strength 2500 VAC Max. Operating Voltage 700 V or √P*R, whichever is less Inductance PF2472 11.7nH / PF2473 12.3nH Insulation Resistance >1000 Meg-Ohm Terminal Finish Tin Plated Copper Mass 6.3g Flammability Rating 94-V0 Environmental Performance DR Test Conditions Load Life ±1% + 0.05W 25°C, 90 min ON, 30 min OFF, 1000 hr Humidity Resistance ±1% + 0.05W 40°C, 90-95% RH, DC 0.1W, 1000 hr Temperature Cycle ±0.25% + 0.05W -55°C for 30 min, +155°C for 30 min, 1000 hr Solder Heat ±0.1% + 0.05W +350°C, 3s Vibration ±0.25% + 0.05W IEC60068-2-6 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201901_003

PF2470 Series TO-247 Power Film Resistors SPECIFICATIONS (continued) Power Derating Power Rating Notes - % Power The PF2470 Series Thin Film Resistors must be attached to a suit- able heatsink. The maximum internal resistor temperature is 175°C. +25 °C 100 To specify an appropriate heatsink use the following formula : 80 T -(P*R )-T 60 R = MAX HR A HH P 40 20 +175 °C Where: RqH = Thermal Resistance of Heatsink ( °C/W ) RqR = Thermal Resistance of Resistor ( °C/W ) 0 TMAX = Maximum Temperature of Resistor -50 0 50 100 150 200 T = Ambient Temperature of Heatsink ( °C ) A Flange Temperature (C) P = Power Through Resistor ( W ) A D tolerance tolerance Dimension mm Inches ± ± F A 16.0 0.2 0.63 0.008 B 20.0 0.5 0.787 0.02 B C* 14.5 0.5 0.571 0.02 ØH D 4.8 0.2 0.189 0.008 E 10.9 0.1 0.429 0.004 I F 5.1 0.5 0.201 0.02 C G 0.8 0.05 0.032 0.002 ØG H 3.6 0.1 0.142 0.004 I 3.6 0.2 0.142 0.008 E * Custom lead lengths available. Contact factory. Mounting Notes - The PF2470 Series Thin Film Resistors must be attached to a suitable heatsink. Mount resistor using thermal grease to a clean, flat surface. Use a compression washer to provide 150 to 300 pounds ( 665 to 1330N ) of mounting force. Torque mounting screw to 8 in-lbs ( 0.9 N-m ). Back plate is isolated from both pins. Ordering Information Part Description: Part Type - Resistance - Tolerance Example: PF2472 10 Ohm 1% Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201901_003

PF2470 Series TO-247 Power Film Resistors Pulse Energy Durability Pulse Energy Durability P ulse Peak Power (W) Pulse Peak Power (W) PF2472_10ohm-1% PF2473_10ohm-1% 1 000k 1 000k Tentative continuous-pulse power allowance at Tentative continuous-pulse power allowance at duty 0.01. Load life test will be necessary in duty 0.01. Load life test will be necessary in 100k actual equipment, Because curve will be changed 100k actual equipment, Because curve will be changed by resistance, repetition, duty and operating by resistance, repetition, duty and operating temperature. Dotted shows estimation. temperature. Dotted shows estimation. 10k 10k 1k 1k 1300W 1100W 100 100 100W 140W 10 10 10n 100n 1u 10u 100u 1m 10m 100m 1 10 10n 100n 1u 10u 100u 1m 10m 100m 1 10 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201901_003