BCX38A/B/C The maximum permissable operational temperature can be obtained using the equation: 1.0 Power (max ) −Power (actual ) RS≤10kΩ Tamb(max) = + 25°C 0.0057 R 0.8 S=47kΩ RS=1MΩ Tamb(max) = Maximum operating ambient temperature 0.6 Power (max) = Maximum power RS= ∞ 0.4 dissipation figure, for a given VCE and source resistance (RS) Maximum Power Dissipation - (W) 0.2 Power (actual) = Actual power dissipation 1 10 100 in users circuit VCE - Collector-Emitter Voltage - (V) 3-22