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Whitech
Level 1
Level 1
First reply posted First question asked Welcome!

Hi. The voltage and current handling of SPA11N80C3 and SPP11N80C3 are the same but why does SPA11N80C3 handle 34W and SPP11N80C3 handles 156W.

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1 Solution
Meghana
Moderator
Moderator
Moderator
50 likes received 100 solutions authored 10 likes given

Hello @Whitech , 

SPA11N80C3 is TO-220 Fullpack device and SPP11N80C3 is regular TO-220 device, which means SPA11N80C3 does not have an exposed thermal pad. Hence SPA11N80C3 has higher Rthjc compared to SPP11N80C3 . 

Power dissipation capability of the device is mainly dependent on the thermal resistance of the device. Hence due to the difference in the Rthjc, we see a difference in the power dissipation capability of the devices as well. Below snapshot gives more information about the nomenclature of the mentioned device. 

Meghana_0-1689914039287.png

I hope this clarifies your query. Please feel free to share if you have further questions.

 

Regards

Meghana

 

View solution in original post

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3 Replies
Meghana
Moderator
Moderator
Moderator
50 likes received 100 solutions authored 10 likes given

Hello @Whitech , 

SPA11N80C3 is TO-220 Fullpack device and SPP11N80C3 is regular TO-220 device, which means SPA11N80C3 does not have an exposed thermal pad. Hence SPA11N80C3 has higher Rthjc compared to SPP11N80C3 . 

Power dissipation capability of the device is mainly dependent on the thermal resistance of the device. Hence due to the difference in the Rthjc, we see a difference in the power dissipation capability of the devices as well. Below snapshot gives more information about the nomenclature of the mentioned device. 

Meghana_0-1689914039287.png

I hope this clarifies your query. Please feel free to share if you have further questions.

 

Regards

Meghana

 

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Thank you. I did not receive the snap shot. I would like to know whether I
can use the SPA(34W) in the place of the SPP(156W). If so does it mean a
bigger heatsink or can it not be substituted?

Regards
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Meghana
Moderator
Moderator
Moderator
50 likes received 100 solutions authored 10 likes given

Hello @Whitech , 

I was referring to the part nomenclature snippet that was attached in the previous comment when i said snapshot. I'm adding it here again. 

Meghana_0-1690364477101.png

SPA11N80C3 has a lower power handling capability compared to SPP11N80C3. Even with a bigger heatsink you will not be able to improve the power dissipation capability of SPA11N80C3  beyond certain level. For example, no matter how big the heatsink is, at Tc=25degC, you can maximum dissipate 34W across SPA11N80C3 . 

Hence it totally depends on the power dissipation you have across your current device SPP11N80C3. If its beyond 34W and you intend to use SPA11N80C3,  then to have safe operation Tc should be maintained below 25degc at all ambient temperatures, which is practically not viable. Hence we recommend you to estimate the power loss across the device first and then we can assess whether it SPA can be used as replacement for SPP. 

Regards

Meghana

 

 

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