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Old 23rd October 2018, 10:25 AM   #1
senthilkumar is offline senthilkumar
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Default bjt power dissipation

hi,
transistor data sheet has two types of maximum power dissipation data like below for bc546 d onsemi transistor kindly see attachment

Total Device Dissipation @ TA = 25C
Derate above 25C
PD 625
5.0
mW
mW/C
Total Device Dissipation @ TC = 25C
Derate above 25C
PD 1.5
12
W
mW/C

both units are PD and derate above 25 degree . quiet confusing . what is the difference between these two ?
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File Type: pdf BC546-D.PDF (107.1 KB, 9 views)
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Old 23rd October 2018, 10:41 AM   #2
cliffforrest is online now cliffforrest  United Kingdom
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bjt power dissipation
TA is ambient temp, TC is chip temp

If the TC is (somehow!) held at 25c the device is able to dissipate 1W5.

TA is more meaningful for real-world (eg PCB mounted) applications, ie DIY.
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Old 23rd October 2018, 10:42 AM   #3
avtech23 is offline avtech23  Australia
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bjt power dissipation
First result on Google:

https://en-support.renesas.com/knowledgeBase/16981030
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Old 23rd October 2018, 10:42 AM   #4
Kay Pirinha is offline Kay Pirinha  Germany
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TA = ambient temperature
TC = case temperature


Best regards!
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Old 23rd October 2018, 10:47 AM   #5
senthilkumar is offline senthilkumar
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thank you all
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Old 23rd October 2018, 12:29 PM   #6
cliffforrest is online now cliffforrest  United Kingdom
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bjt power dissipation
And it IS case, not chip - I'm getting old!
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