Micro Chip

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

10 years, 7 months ago.

Desoldering 402 sized components

What if I pull a pad? What type of solder did you use? What's the liquidous temp on it? (Lead free solder is higher temp.)

Question relating to:

Last updated: 30 Apr 2020
LPC800, LPC812M

3 Answers

Kai Liu
10 years, 6 months ago.

Agree. Desoldering 0402 SJ1/SJ4 0R resistor from LPC812MAX is dangerous for me.

Christian Lerche
10 years, 6 months ago.

It's not that hard. Regular solder-temps could be used, but you will have a non-lead-free solderpad from then on.
The heat will transfer through the component-body, and heat the other pad, then it will be easy to remove.
Lerche

ceri clatworthy
10 years, 6 months ago.

Just melt the solder, AND resistor, with just enough solder to bridge both pads

with a twist of the wrist, you can catch the resistor on the tip, and remove, do not try to keep the resistor,

use some fine solder braid, and a little no-clean flux, to remove excess solder,

then short out the other two pads, with just enough solder to bridge the pads.

Ceri

Naive question, but if you are going to short the connection anyway, why not just leave the resistor and solder a piece of wire across it?

posted by Dave Bracey 16 Oct 2013

Oh - I see you say "the *other* two pads". I thought you wanted to short the same contacts.

posted by Dave Bracey 16 Oct 2013