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The specification is 170mA maximum continuous drain current AND a maximum drain voltage of 100V. They are limits of two different parameters but whatever voltage and current you run them at you still have to observe the power dissipation limit of Id * Vd.
The actual dissipation is Rds * Id ^2, the apparent resistance between drain and source multiplied by the drain current. It is basic Ohms Law.
Are you saying you have 100V across drain and source and it is passing 170mA, maximum for both, and you are only seeing 0.36W dissipation? Please show your schematic.
The limits are 100V at any current and 170mA at any voltage provided the dissipation doesn't exceed 0.36W.
Most probably you have
* OFF: 100V, 0 mA
* ON: some mV, 170 mA
In both cases the power dissipation is low.
Mind:
* not the power supply voltage counts, but V_DS, which is the voltage between Drain and Source
* and drain current
For power dissipation, the actual drain current x the actual V_DS.
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