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Vishay Sfernice
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
? Surfaces in contact must be carefully cleaned.
? The heatsink must have an acceptable flatness: From 0.05 mm to 0.1 mm/100 mm.
? Roughness of the heatsink must be around 6.3 μm. In order to improve thermal conductivity, surfaces in contact (alumina,
heatsink) are coated with a silicone grease (type Sl 340 from Rh?ne-Poulenc or Dow 340 from Dow Corning).
? The fastening of the resistor to the heatsink is under pressure control of two screws (not supplied).
Tightening Torque
on heatsink
RCH 5
0.5 Nm
RCH 10
0.6 Nm
RCH 25
0.7 Nm
RCH 50
1 Nm
? In order to improve the dissipation, either forced-air cooling or liquid cooling may be used.
? A low thermal radiation of the case allows several resistors to be mounted onto the same heatsink.
? Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm).
? In any case the hot spot temperature, measured locally on the case must not exceed 125 °C.
? Tests should be performed by the user.
CHOICE OF THE HEATSINK
The user must choose according to the working conditions of the component (power, room temperature). ?
Maximum working temperature must not exceed 125 °C. The dissipated power is simply calculated by the following ratio:
? T
P = -------------------------------------------------------------------------------------------
R TH (j - c) + R TH (c - h) + R TH (h - a)
? 1 ?
R TH (j - c) + R TH (c - h) + R TH (h - a) = = 75 - = 3.75 °C/W ?
? T
P: Expressed in W
? T: Difference between maximum working temperature and room temperature or fluid cooling temperature.
R th (j - c) : Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal
resistance of the component.
R th (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.
R th (h - a) : Thermal resistance of the heatsink.
?
Example: ?
R TH (c - a) for RCH 25 power rating 20 W at ambient temperature + 50 °C ?
Thermal resistance R TH (j - c) : 2.5 °C/W ?
Considering equation (1) we have:
? T = ? 125 °C - 50 °C ? 75 °C ?
R TH (j - c) = 1.4 °C/W (Special Features) ?
------- ----
P 20
R TH (c - h) + R TH (h - a) ? 3.75 °C/W - 1.4 °C/W ? 2.35 °C/W ?
with a thermal grease R TH (c - h) = 1 °C/W, we need a heatsink with R TH (h - a) = 1.35 °C/W
Revision: 01-Aug-13
3
Document Number: 50006
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
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