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PCH-I-50 Datasheet(PDF) 3 Page - Picker Components

Part # PCH-I-50
Description  Heat Sinks
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Manufacturer  PICKER [Picker Components]
Direct Link  http://www.pickercomponents.com
Logo PICKER - Picker Components

PCH-I-50 Datasheet(HTML) 3 Page - Picker Components

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3220 Commander Drive, Suite 102 Carrollton, TX 75006
www.PickerComponents.com
Sales: (972) 713-6272
(888) 997-3933
Fax: (972)735-0964
e-mail: sales@pickercomponents.com
Dimensions are listed for reference purposes only.
Specifications and Availability subject to change without notice.
PCS86 6/05/15
3 of 2
Calculating SSR Heat Dissipation:
TJ-TA=P x RJA
RJA=RJC+RCA
P=I x V
Where:
TJ is the junction temperature of the output semiconductor in °C, use 125°C for Triacs, SCRs & Mosfets,
TA stands for the ambient temperature in °0
P is the power generated by the internal semiconductor in Watts, where I is the maximum output current of the SSR and V is the Forward Voltage of
the semiconductor
RJA stands for thermal resistance in °C/W from junction to ambient ignoring the thermal resistance from the SSR metal base to heat sink
RJC stands for thermal resistance from junction to case – obtain from data sheet
RCA stands for the thermal resistance from case to ambient.
An example, PCS15-D-249A-20Z with a 10 Amp Load Current in free air:
RJC is 1.2 °C/W (from data sheet), RCA 8.5 °C/W (free air heat dissipation), TJ is 125°C, I is 10 Amp load current, V is 1.1V (Forward Voltage drop of
triac at 10 Amps), in formula:
125 – TA = (10 x 1.1) x (1.2 + 8.5)
thus TA = 17.3°C or 63°F which is the maximum ambient temperature this relay will operate without a heat sink. Another way of looking at this,
the maximum current the relay can handle at 25°C is 9.3 Amps
Add a PCH-H-110 Heat Sink with its 1.1°C/W (RCA) Thermal Resistance with the same 10 Amp Load:
125 – TA = (10 x 1.1) x (1.2 + 1.1)
thus TA = 99.7°C or 211°F which is the maximum ambient temperature this relay will operate with the PCH-H-110 heat sink. Also, the maxi-
mum current the relay can handle at 25°C is 39.5 Amps (Go with the 40A version of the relay)


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