Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [pad]

For questions about PCB pads, which are exposed regions of metal that component leads are soldered to. Use in conjunction with "pcb" and/or related "pcb-" tags (e.g. "pcb-fabrication"), as applicable.

For questions about PCB pads, which are exposed regions of metal that component leads are soldered to. Use in conjunction with and/or related PCB tags (e.g. ), as applicable.

133 questions
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votes
5 answers

Testpoints: Vias versus pads

I was fixing an ultra cheap home router few days ago and noticed that it had vias marked TP_12V, TP_3V3, TP_GND and similar. The problem turned out to be leaky electrolytic crapacitors in the buck converter and the vias really helped debugging that,…
AndrejaKo
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26
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6 answers

Is it OK to route a trace through a pad?

Will I have any trouble routing the traces in this way? (VCC and GND) Is it OK considering that the entire circuit current is under 50mA?
Lucas Alexandre
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17
votes
1 answer

Using a via to strengthen surface mount connector on or near pad

I am trying to design a board that has a surface mount connector. I was shown a picture of an example board that has vias on the pads of the connector. I don't believe the via is for connecting to a layer necessarily. Meaning I was told that they…
AntMan
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15
votes
3 answers

KiCad: Some pads to solder wires on

I am working on a PCB for which I need external soldered wires. I made the whole PCB with al the traces on the front layer. Then, with 3 vias, I got to the back layer. Here I need to solder 3 wires to the traces (green traces on picture). I used a…
jan
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12
votes
4 answers

Square vs Round pad

I'm curious why PCBs have one square pad in row for 0.1" headers. What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?
Pararera
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10
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3 answers

Using oblong / rounded surface mounted pads for chip resistors, capacitors and inductors

I'm learning to layout PCBs and lately I came across practice that made me curious. The chip passives' pads are etched with oblong / rounded shape, instead of rectangular shape that is used in all example libraries and even the IPC-7351B standard…
Andrzej H
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10
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4 answers

Connecting pads with the same functionality belonging to one chip

I have a question about routing style of pads with the same functionality belonging to one chip. I draw a picture in Paint (fictional IC; let it be the SOIC8 footprint). GND is only as example (it can be any net, but the same functionality for both…
Karlsson
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10
votes
3 answers

Pads in IC's corners

One can sometimes observe rectangle pads in the corners of some IC's footprints: What are they for?
Łukasz Przeniosło
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8
votes
1 answer

What are the dents for?

I bought a few bc417 serial Bluetooth modules which have pins that look like this: Is there a standard name for this kind of pin? I believe I can treat them like any other SMD pin, but I'm curious what the dents are for. Are they intended for a…
Karl Bielefeldt
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8
votes
2 answers

In Eagle, why is the tstop layer larger than the pad itself?

Why is the tstop aperture around a pad larger than the pad itself? I would have imagined that it would be exactly the same size, or slightly smaller, so that the solder stays only on the defined pad. Would there be any reason to make it larger, or…
Eraticus
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7
votes
3 answers

Impact of increased pad length in PCB

I was wondering why I cannot edit footprint of LED 1206 to take care of LED 0805 as well so that I can mount one of them depending on the availability. To do this, I have to increase the pad size of 1206 footprint on the inner side to give a…
Rajesh
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7
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2 answers

Solder trap pads

I would like to know what is the name of those special pads designed to catch excessive solder and where can I find more information on them.
Iouraxos
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6
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3 answers

Can breakout board still be used if the pad gets ripped out?

In a desoldering incident, my beautiful board ended up like this: Other side: The guy doing the desoldering says there is no chance this board is usable since he claims he ripped through the connection between the pad and the board. To me it looks…
Kaizer Sozay
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6
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1 answer

Eagle 'optional' solder pads

I'm currently designing a PCB with inter-board interconnects - I figure that right-angle 0.1" headers will be sufficient. I'll be "mass producing" the boards (only a couple of dozen...) so I need them all to be the same. But it turns out that some…
John Burger
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6
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2 answers

Size of SMD pads for components with high tolerances

I'm building an Eagle component for an LSM115J. The connectors on this part have fairly large tolerances (1.85-2.21mm width, 0.76-1.52mm length). There is no recommended land pattern. Should I go for the largest size (so the part will never need to…
Simon Richter
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