Step 1: Calculate Power Dissipation in Device (Pdiss)

    Already know your Pdiss? Enter it below just under the dotted line.

    Inputs
    • Supply: Volts
    • Current: mA
    • Pin:
    • Pout:
    Outputs
    • DC Power: Watts
    • Gain: dB
    • Drain/Collector Efficiency: %
    • Power Added Efficiency: %
    • Power Dissipated In Device (Pdiss): Watts
    Already know your Pdiss? Power Dissipated In Device (Pdiss): Watts

    Step 2: Calculate Max Junction Temperature

    Inputs
    • Maximum Case (Tbase) Temperature: °C
    • Rth Junction To Case: °C/Watt

    Note:

    Measured values vary based on application and measurement method. The most accurate data is located on the product data sheet.

    Outputs
    • Max Junction Temperature: °C


    Formulas Used

    • DC Watts = Supply V × Current / 1000
    • Gain (dB) = Pout dBm - Pin dBm
    • Pin Watts = (10^(Pin dBm / 10)) / 1000
    • Pout Watts = (10^(Pout dBm / 10)) / 1000
    • Drain/Collector Efficiency % = (Pout Watts / DC Watts) × 100
    • PAE % (Low Gain < 25dBm) = (Pout Watts - Pin Watts) x 100 / (DC Watts)
    • Pdiss Watts = DC Watts + Pin Watts - Pout Watts

    • Temperature Change °C = Rth Junction to Case × Pdiss Watts
    • Max. Junction Temperature at max. Case Temp = Temp Change °C + max. Case Temp°C
    • Note: Tbase = interface between part and PC board/heatsink.


     

    Have questions about using this tool? Email the Qorvo Tools team and we will be happy to assist you.