Power thin/thick film resistors are easy to “fever”, how to choose a suitable heat sink for them?

“Power Thin/Thick Film Resistor is a resistive product that maintains high stable performance when subjected to high current. At the same time, resistors generate heat during operation, so heat dissipation requires thermal management solutions. Most power film resistors are available in industry standard IC packages such as TO-220 and TO-247 for direct mounting on heat sinks. Choosing the correct heat sink can usually be done by looking at the data sheet.

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Q: Choose the right heat sink for power thin/thick film resistors

Power Thin/Thick Film Resistor is a resistive product that maintains high stable performance when subjected to high current. At the same time, resistors generate heat during operation, so heat dissipation requires thermal management solutions. Most power film resistors are available in industry standard IC packages such as TO-220 and TO-247 for direct mounting on heat sinks. Choosing the correct heat sink can usually be done by looking at the data sheet.

For example, the LTO050F10R00JTE3 of Vishay Sfernice’s LTO50 series has a thermal resistance of 2.5°C/W (exposure to air at 25°C); if the resistor operates at ambient temperature +25°C and rated power is 10W, and using thermal conductivity For silicone grease, a 9°C/W heat sink is required.