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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.

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Which method can be used to properly fill a via-in-pad by hand?

Assume that you have a via hole inside a pad. Which method can be used to properly fill a via-in-pad by hand so it will be equal or similar as the protection of vias according to IPC 4761? Which ...
euraad's user avatar
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Pads for Flexypins in Eagle CAD?

can anyone give help on creating pads for Flexypins in Eagle? The hard part is the plated-through oval racetrack slot. I get the idea that it would be OK to simply drop an SMD rectangle on top and ...
Larry Pearlstein's user avatar
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1 answer
67 views

What's the purpose of a large thermal pad without a heatsink?

I found this thermal pad on a controller board for SATA to USB enclosure. It's stuck on the SATA to USB bridge ICs. You can see 2 ICs to the left of it. There was an identical thermal pad adhered ...
Nicolay Doytchev's user avatar
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1 answer
68 views

Why is KiCad repeatedly re-assigning the Ground Pin of a row of resistors to some random pad?

I have run into an odd problem with KiCad, whereby a row of resistors has its ground pads re-assigned to some random pad. This happened with the central row of resistors first of all, which were ...
Hektor's user avatar
  • 165
1 vote
2 answers
109 views

how to make heat sink under heat pads in kicad 7

Retired user here that have not designed a circuit in the last 3 years. So I got myself KiCad 7 and boy oh boy things have changed! Mostly for the better, but some things I used to do are now a real ...
Luc Belanger's user avatar
1 vote
3 answers
63 views

IC thermal pad: Place heat sink directly over bottom-side thermal pad and thermal vias

If a VQFN package (below) has a thermal pad and thermal vias beneath it, the bottom layer should have an identical pad to act as a heat sink. Is it typical to surface mount a heatsink on the bottom-...
kando's user avatar
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1 answer
61 views

IC thermal pad: Duplicate zone in inner layers also?

Question For a passively-cooled portable device (fanless, ambient cooling), what are typical methods to supplement the thermal pad of an IC to mitigate device temperature rise, (beyond efficient ...
kando's user avatar
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1 vote
1 answer
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Transformer pins not matching PCB layout

I am replicating one of our recommended designs for a POE application. Here I have an EP13 forward transformer FCT1-50M22SL as recommended in the BOM. The pins do not match the provided image of the ...
Wes Ellgass's user avatar
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2 answers
46 views

New to PCB design: Does routing a wire on a 2nd layer underneath a pad connection effect cause a connection issue?

I am designing a pcb with minimal room approximately 5.5mm wide, the power supply comes from one end of the board. The top layer has pad connections that take up most of the width of the board leaving ...
J_KILEY76's user avatar
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1 answer
60 views

Altium full-stack pad custom shape

I an currently trying to reconstruct a PCB in Altium from the Gerber files. So far, I have been able to import the Gerbers in a PCB document. The existing Gerbers have through-hole pads that have a ...
ESD's user avatar
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1 answer
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PTH Pad too close, how to resolve?

I have settled on this component for our spin dials: https://www.digikey.com/en/products/detail/cts-electrocomponents/292V1X24A/12091626 Problem is, in fusion pcb my pads nearly touch, while the holes ...
Wes Ellgass's user avatar
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2 answers
41 views

PADS for land pattern coilcraft

How can you even make a footprint/ land pattern with this info. Is that land pattern the pads? Is that a wire going into the model, meaning my pad just needs to touch either side of the component? ...
Wes Ellgass's user avatar
4 votes
3 answers
2k views

Acceptable PCB practice for pad routing and vias

Two questions on beginner PCB design: For integrated chips on PCB design, can you draw routes from the side of the contact pad, or is it standard practice to go head-on straight to the pad entry? ...
starboy's user avatar
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5 votes
5 answers
1k views

Off-center via-in-pad

I am designing a board for a 0.8 mm pitch large BGA component. I will be using via-in-pad. There are some differential pairs that need to escape the pin field. The smallest my board house can do (...
jvtnv's user avatar
  • 53
16 votes
5 answers
3k views

What is an ideal layout for a normally-open solder jumper?

We would like to make a normally-open solder jumper between two 50x50mil unmasked square pads. I've seen this kind of thing by others and would like to replicate it in our layout. We tried a simple ...
KJ7LNW's user avatar
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1 vote
2 answers
95 views

Identical component on both sides of PCB with vias in ground pad

I have a dual analog output PCBA that I am routing. The analog output component selected is two TI DAC7750IRHAR DACs. These DACs are controlled via SPI lines. I had originally intended to place both ...
rothloup's user avatar
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Unconnected pads when updating footprints

I got a regular footprint for a resistor, but I had to change it to a jumper so I updated the footprint to be like the photo below, but when I update the sch and pcb I lost one of the connections, I ...
AlAnood Ballan's user avatar
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1 answer
56 views

Eagle: Adding thermal to QFN components

How to properly place thermal vias under components? I hook them up to the ground net, the same as the ground pad of my QFN component, but they don't seem to connect. Do I need to edit the footprint ...
thegamebusterpl's user avatar
4 votes
1 answer
320 views

Reflow soldering with decreased footprint size fully within pad

So the original footprint is first, followed is the edited footprint to allow for inner pads to be accessed. As you will notice the extended pad footprint is smaller than the pad. Will this cause ...
Tony's user avatar
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5 votes
1 answer
165 views

Are these circles in the exposed pad of a VQFN footprint meant to be non-metallized, and if so, for what purpose?

I am creating a footprint for a TI TXS0108ERGYR level shifter and encountered these circles drawn in the exposed pad for its land pattern: Are these meant to be non-metallized and if so, for what ...
JYelton's user avatar
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1 vote
1 answer
183 views

Disobeying recommended pad size of 0603 LED

I need to pack a cluster of 0603 LEDs (https://docs.rs-online.com/c349/0900766b81180479.pdf) as close together as possible on a PCB. The datasheet recommends a pad-to-pad width of 2.3mm. As the board ...
19172281's user avatar
  • 743
2 votes
2 answers
406 views

Is it a bad practice to route to a pad from its corner?

I am new to PCB design, I wonder if there are any bad effects by routing it through the corner of a pad. (Top right) Any input is appreciated.
Terrence's user avatar
4 votes
5 answers
2k views

Exposed pad and ground

I'm using this device - ATSAMD21G17A While I measured the connection between the exposed pad and ground, they seem to be unconnected. When I went and check on section 10, problem 20, on page 30 of ...
user avatar
4 votes
2 answers
650 views

Shorting (connecting) two pads that are on opposite sides of the PCB

I have a PCB that has two rectangular pads on either side of the PCB, exactly opposite to each other. They need to be temporarily shorted (connected) to allow setting of some parameter through ...
Sharan V K's user avatar
1 vote
1 answer
344 views

TP4056 / thermal pad

I am preparing a circuit using a TP4056. This circuit has a thermal pad. The datasheet says that this pad must be connected to ground or nothing. However, some forum discussions talk about connecting ...
hervema's user avatar
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1 vote
1 answer
57 views

A question about pad footprint

I want to make a PCB for the pins of this unit: So the pins at the bottom of the unit will be soldered to a custom PCB. In the bottom it is shown that the pin diameter is 0.5mm. When making PCB pads ...
cm64's user avatar
  • 2,217
0 votes
1 answer
2k views

Steam Deck: how to solder 3 pin bumper button with one missing (ripped-off) solder pad?

I don't have a lot of experience with soldering, but I can manage small repairs and I regularly watch TronicsFix's repairing videos (like this one for the same issue I have). Quite lucky, right?! So ...
NutuS's user avatar
  • 3
0 votes
2 answers
417 views

Repairing torn-off pad on an SMD component

I've seen several similar topics where people have torn off PCB pads, but in my case, I managed to tear off a pad from an SMD component (a sealed pressure sensor). It was one of the communication (I2C)...
Justinas Rubinovas's user avatar
2 votes
3 answers
610 views

Is there a rule of thumb or an IPC standard for reducing (windowing) solder paste deposition on exposed pads?

I am creating a footprint for a 24-pin QFN package with exposed thermal pad. Sometimes manufacturers will provide solder paste mask guidelines in addition to metallization for the landing pattern, but ...
JYelton's user avatar
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3 votes
1 answer
347 views

Pads on multilayer PCBs

When we are dealing with multilayer PCBs, are the component pads (through-hole) present on all layers, or just on the top and bottom layers?
Jonathan_the_seagull's user avatar
2 votes
1 answer
234 views

What determines the choice of maximum material condition (MMC) versus least material condition (LMC) when designing a BGA footprint?

I am evaluating the IPC-compliant footprint wizard in Altium Designer. One of the steps is to determine the pad size relative to the nominal ball diameter: Related to this topic, an answer provides a ...
JYelton's user avatar
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10 votes
4 answers
2k views

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 ...
Karlsson's user avatar
  • 113
0 votes
1 answer
128 views

SMD pad size for custom component

I'm trying to reflow a custom shaped strip onto a PCB, but I'm unsure about what size pad I need on the PCB. The strip is 13mm x 6mm x 0.3mm. The PCB surface finish is ENIG. The pad is likely to be ...
Dan's user avatar
  • 133
5 votes
4 answers
3k views

Through holes vs pads for hand soldering

I am currently designing my first PCB to be manufactured by a fab (I am using JLCPCB). The base material that JLCPCB offers is FR-4 TG130. In that design, I have a few wires that would need to be hand-...
Dakkaron's user avatar
  • 879
1 vote
1 answer
265 views

SMA connector pad size

I am designimg a board with an SMA connector for 8 GHz. The trace is calculated as a coplanar waveguide. For the given stackup, it is 0.25 mm wide. The SMA connector pin is also 0.25 mm wide. If I ...
phenom's user avatar
  • 11
1 vote
0 answers
167 views

PCB 0402/TQFN pad design

I am currently designing a product which uses 0402 passives and other fine-pitch parts. As the PCB-space required is a major design goal I want to reduce the footprints. High production yield is also ...
ElectronicsStudent's user avatar
2 votes
1 answer
3k views

KiCad: Ground plane won't connect to pads

I am currently running into a problem in KiCad where the ground plane won't connect to some pads. KiCad even tells me to connect them but doesn't seem to make the connection automatically.
Philipp Bleimund's user avatar
3 votes
1 answer
81 views

Why is this recommended in PCB layout: 2 leads between pads

Why is the connection recommended as in the top picture?
İbrahim ATİKER's user avatar
0 votes
2 answers
1k views

How to go about repairing a ripped solder pad on a USB flash drive?

I have a flash drive that sustained damage to the USB port. It looked like it just needed to be reseated with fresh solder and some TLC so I went ahead and started to remove the damaged port, then one ...
restorehub's user avatar
0 votes
2 answers
146 views

Reading the pad dimensions from the data sheet

I would like to know in what units are these dimensions?
Faizan Cassim's user avatar
1 vote
1 answer
93 views

Altium surface pad next to throughhole pad design

I'm trying to make a simple board that will use an Arduino Nano 33. These boards allow for being either used as an SMT board or with a standard throughhole header. I'd like to make the board where I ...
user2508385's user avatar
0 votes
0 answers
66 views

elongated footprint pads for LGA, BGA, QFN packages

Sometimes I need to add more solder in between a capsule and its land patterns, other times I even need to remove some. It would be much easier if the footprint pads were protruding out from ...
kellogs's user avatar
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2 votes
2 answers
2k views

6 dB in-line 50 ohm attenuator

Recently someone posted a question regarding an inline device to attenuate their voltage on a 50 \$\Omega\$ coax by half (i.e. 6 dB). Because the question asked for commercial recommendations, it was ...
Math Keeps Me Busy's user avatar
1 vote
1 answer
88 views

Solder pad with no copper circles inside?

I'm trying to use a ROHM BD9F800MUX (buck PMIC regulator with synchronous regulation.) Upon looking at their footprint guide, it has something I have not seen before and is poorly documented. It ...
MadHatter's user avatar
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0 votes
2 answers
689 views

Stereo Headphone Cabling (TRS) - Why 4 pads on L loudspeaker and 4 cables?

The R(ight) loudspeaker on my AKG-K99 headphones stopped working. I bought a replacement (x2) 'mini' loudspeaker. After soldered the replacement the sound was "weird". No problem. I ...
krg's user avatar
  • 39
0 votes
1 answer
356 views

Electric heating pad voltage issue with STC1000

I have bought an electric heating pad from Adafruit. It works fine if I connect both legs to a power supply directly. However, I would need to connect it to a temperature controller (STC1000) for my ...
Xenon's user avatar
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0 votes
2 answers
1k views

Replace a DC jack I messed up. Can I bypass the DC jack or run from the batteries? [Sampler SP-202]

I need help to fix/replace a DC jack. I messed it up and the board I need to fix used batteries as well but now they wont work because I butchered the DC pads. Is there a way to bypass the DC jack and ...
Elemental Blendz's user avatar
0 votes
3 answers
654 views

Pad holes are filled in Eagle

In Eagle (v9.6.2), the routes fill the holes of my pads. hence when I want to print it, the pads are all black, no drill holes. What am I missing? I know this is similar to Eagle Ground Pour Fills ...
will.mendil's user avatar
0 votes
0 answers
143 views

How to create a copper pad for heat dissipation in Eagle?

The data sheet for this component, the RPX-1.0, says SW Switch node. Connect 6, 7, and 8 to large copper pad for optimal heat dissipation. Is a "large copper pad" an extra component that ...
DRC's user avatar
  • 107
10 votes
3 answers
992 views

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's user avatar