Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Through body thermal resistance of SOT223?

cupoftea

Advanced Member level 5
Joined
Jun 13, 2021
Messages
2,704
Helped
54
Reputation
108
Reaction score
116
Trophy points
63
Activity points
14,293
Hi,
We have 0.85W in a SOT223. It only has a small bit of thermal copper pour within the footprint boundary, between middle pin and tab pin.
So we need to gap pad it to metal enclosure with 2.5mm thick gap pad.....but do you know the RTHjc going through the plastic body?


The following doesnt tell us the "thru' body" RTHja.
--- Updated ---

i Seem to remember 30degc/w for QFN FETs..(through the plastic body)...so for SOT223, you would say some 45c/w?
 
Last edited:
The following...
SOT223 RthJA
....on page 6..appears to show that with our ~9mm^2 of thermal copper under the SOT223, we will get a RthJA of some 135degC/W.
(This refers to 2oZ copper)
Would you agree with this?
--- Updated ---

I had a post on EDAboard on through-plastic-body thermal resistance of SMD FETs in approx 2016....but cant seem to find it now. That would be of relevance here.
--- Updated ---

Approx April to November 2016
 
Last edited:

LaTeX Commands Quick-Menu:

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top