PCA9557: about thermal resistance, Rjt, Rjc and Rjb

Joyce Li

Part Number: PCA9557

Hi dear experts,

Would you please provide PCA9557 Rjt, Rjc and Rjb information to me? Datasheet only lists Rja. Plus, what is the max Junction temp of PCA9557.

Thanks very much for your reply in advance.

BR,

Joyce Li

over 4 years ago

0 BOBBY over 4 years ago

TI__Guru 60100 points

Hi Joyce,

Which package are you requesting this for?

-Bobby

0 Joyce Li over 4 years ago in reply to BOBBY

TI__Intellectual 2170 points

Hi Bobby,

We are asking for PCA9557PWT TSSOP TW package.

We only see Rja in datasheet, other information is not found in datasheet. Hope you can help.

Thanks a lot!

BR,

Joyce

0 BOBBY over 4 years ago in reply to Joyce Li

TI__Guru 60100 points

Hi Joyce,

I have placed a ticket for a thermal modeling request for you.

The turn time on these is typically 2 weeks, sometimes faster if there isn't a large queue.

If you don't hear back from me here in 2 weeks, please send me a reply here or at duynguyen@ti.com so I can check on your ticket.

Thanks,

-Bobby

0 BOBBY over 4 years ago in reply to BOBBY

TI__Guru 60100 points

Thermal data is shown below:

-Bobby

0 Joyce Li over 4 years ago in reply to BOBBY

TI__Intellectual 2170 points

Hi Bobby,

Thanks very much for your support. : )

BR,

Joyce Li

0 Joyce Li over 4 years ago in reply to BOBBY

TI__Intellectual 2170 points

hi Bobby,

May I know the max Tj of PCA9557?

Thanks a lot for your reply.

BR,

Joyce

0 BOBBY over 4 years ago in reply to Joyce Li

TI__Guru 60100 points

Hi Joyce,

For a recommended max Tj, we typically give +5C of the Ta value so this would give us 90C.

For an absolute maximum, since this is an older device I recommend 105C as the absolute max.

Thanks,

-Bobby

0 Joyce Li over 4 years ago in reply to BOBBY

TI__Intellectual 2170 points

Hi Bobby,

Thanks very much for your reply.

BR,

Joyce

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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PCA9557: about thermal resistance, Rjt, Rjc and Rjb