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.

Register Log in

TO220 heatsink with thick base and fins?

C

cupoftea

Advanced Member level 6
Advanced Member level 6
Joined
Jun 13, 2021
Messages
3,072
Helped
62
Reputation
124
Reaction score
139
Trophy points
63
Visit site
Activity points
16,044
Sort by date Sort by votes
What's exactly the available room? Can't you use a heatsink like Fischer SK469 or SK437

1720345495658.png


1720345624797.png
 
Upvote 0 Downvote

36 °C/W, TO-220, 25 mm, 25 mm, 6.5 mm​

50 °C/W, TO-220, 13.2 mm, 12.7 mm, 19.1 mm​

15 °C/W, SOT-32, TO-220, 25.4 mm, 13 mm, 30 mm​

14 °K/W ................. 16 mm, 16 mm, 50 mm

The Rth specs assume lots of space around the heatsink, which you do not appear to have, so do not under-design it. Parallel heatsinks are not like parallel resistors for Rth.

But my guess (?) is you are just trying to add mass to absorb power-on transient.







WAKEFIELD THERMAL 274-2AB
 
Upvote 0 Downvote
Thanks, we are indeed space constrained.
The SK 469 35 STS looks best, as we have 36mm height available
The PCB is vertical mounted so the verticality of the heatsink will be violated, and it will be horizontal.
 
Upvote 0 Downvote
cupoftea said:
The PCB is vertical mounted so the verticality of the heatsink will be violated, and it will be horizontal.
Click to expand...
Then for best heatsink operation you need to mount the heat sink flat on the PCB so the fins run vertically.
 
Upvote 0 Downvote

LaTeX Commands Quick-Menu:

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top