20 W Power Resistor, Thick Film Technology, TO-220

Applications

• 20 W at 25 °C heatsink mounted
• High power dissipation to size ratio
• Wide resistance range from 0.01 Ω to 550 kΩ
• Negligible inductance
• Easy mounting
• TO-220 package: compact and easy to mount
• Two versions of this thick film resistor are available:
• A radial leaded version for PCB mounting
• A flat lead version for surface mounting
• The user must choose the board according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 155 °C. The dissipated power is simply calculated by the following ratio:
• P: Expressed in W
• ΔT: Difference between maximum working temperature and room temperature
• RTH (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: Special Features table.
• RTH (c - h): Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device.
• Rth (h - a): Thermal resistance of the heatsink.