?This might need clarification for some:
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>> Lifting one end is a good way to lift the opposite pad.?
> Donald, you are right. It's good to tell this.
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Lifting one end of a resistor or cap or diode can rip the opposite pad off the board.
That will ruin your day.
Usually easy enough to repair by running a wire from one end of the new part to some nearby pin, but not always.
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I find it much better to use two irons, one on each end of the part.
A SOT23-3 part is easy enough to bend pins on without ripping up pads.
Anything bigger, and I use chip quik alloy applied with a soldering iron to each pin, then a hot air gun,
then very gently pick up the part once it is totally free.
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Also, best not to re-use chip resistors and caps after taking them off the board.
The bits of metal at the ends might still be connected physically,
but the heat and mechanical abuse can separate that metal electrically from the internals of the device.
Keep a stock handy of replacement parts, they only cost a penny or two each.
If you do have to reuse such a part, make sure the metal bits are still solidly attached,
and check the part with a meter for correct value.
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Jerry, KE7ER
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On Tue, Apr 22, 2025 at 07:20 AM, @Ludwig_DH8WN wrote:
On Tue, Apr 22, 2025 at 04:09 AM, Donald S Brant Jr wrote:
Lifting one end is a good way to lift the opposite pad.?
Donald, you are right. It#s good to tell this.
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I'm doing this only for some SMT packages e.g. small diodes (SOD323), small transistors (SOT23) and some tantalum capacitors (yellow). All of these have tiny metal stripes as contacts. There is a distance between the place the stripe comes out of the plastic case and the solder joint. There the metal stripe could be bend with nearly no force. I would never try this for packages like SOD80 or TO252.
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73 Ludwig
