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MOSFET (Si/SiC) Forum Discussions

YuTa_4942221
Level 4
First like given First like received 25 sign-ins
Level 4
I saw the data that the Tj temperature rise of SOT-223 and TO-252 (DPAK) does not change significantly depending on the conditions.
However, when comparing the thermal resistance of each of the same Rds(on) devices, TO-252 is 4.0 [℃ / W] and TO-252 is 18.2 [℃ / W], which is very high.
Please tell me the reason why the thermal resistances are so different.
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SoU_4942226
Level 4
First like given First like received 25 replies posted
Level 4
As shown in the attached document (P.4), the definition of the temperature measurement point differs between TO-252 (DPAK) and SOT-223.
Therefore, the unit of thermal resistance is different.
DPAK: Rthjc Junction-Case
SOT-223: Rthjs Junction-Solder Point

You should confirm the measurement position first, then measure Tj.

View solution in original post

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SoU_4942226
Level 4
First like given First like received 25 replies posted
Level 4
As shown in the attached document (P.4), the definition of the temperature measurement point differs between TO-252 (DPAK) and SOT-223.
Therefore, the unit of thermal resistance is different.
DPAK: Rthjc Junction-Case
SOT-223: Rthjs Junction-Solder Point

You should confirm the measurement position first, then measure Tj.
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