Tools/Power Dissipation Calculator

Power Dissipation Calculator

Calculate power loss and thermal performance

Component Parameters

Component Type

Supply Voltage (V)

Supply Current (mA)

Thermal Parameters

θJA (°C/W)

Ambient (°C)

Max TJ (°C)

Thermal Analysis

IC: 5V × 100mA

Excellent thermal margin

Power Dissipation

500.0

Junction Temp

50.0°C

Max: 125°C

Temperature Rise

25.0°C

Max Power @ Ta

2.00 W

Thermal Derating

40%

Typical Thermal Resistance (θJA)

Package	θJA (°C/W)	Notes
SOT-23	200-300	Small signal
SOT-223	60-80	Medium power
SOIC-8	100-150	Standard
QFN (exposed pad)	25-40	Good thermal
TO-220 (no heatsink)	50-65	Through-hole
TO-220 + heatsink	5-15	With heatsink
D2PAK	40-60	Power SMD

Junction temperature = Ambient + (Power × θJA). Add thermal vias, copper pours, and heatsinks to reduce θJA. Always verify with actual measurements under operating conditions.

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