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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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?
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5
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
user220456
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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 ...
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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 ...
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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 ...
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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 ...
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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)...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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.
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Why is this recommended in PCB layout: 2 leads between pads
Why is the connection recommended as in the top picture?
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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 ...
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2
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129
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Reading the pad dimensions from the data sheet
I would like to know in what units are these dimensions?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Electric Heating Pad Voltage Issue with STC1000
I have bought an electric heating pad from here. 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 own ...
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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 ...
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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 ...
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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 ...
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Pads in IC's corners
One can sometimes observe rectangle pads in the corners of some IC's footprints:
What are they for?
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Fixing a missing solder pad [closed]
Shown below is the PCB of a panel controlling an electric scooter. I accidentally managed to pull out all the wires so they looked as in picture 1.
I wrote to the company who advised me to solder it ...
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Pad Spacing violates trace spacing
How does one deal with a situation where a trace has particular clearance spec to other nets, but that clearance spec is not respected by the pads on a component that the net attaches to?
A simple ...
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SMT Multi-Footprint Size to IPC standards for production
I am currently designing a board that will need end up getting CE tested, and I am currently testing the effects of different sized decoupling capacitors but I am constrained on space.
I want to make ...
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Repair pads on PCB
I've accidentally used too much force on the board while trying to remove a flex connector and so I've removed a lot of PCB pads as well (see image).
I have a new flex connector, but I do not have ...
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What is a way to figure the pads from a datasheet where the part diagram leaves out dimensions?
I am trying to draw a footprint in Eagle (datasheet PDF).
This isn't the first time I had to draw a part without enough dimensions, but I'm wondering if there is an easier or more precise method. ...
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Noob soldering help: test pad repair
So I haven't soldered in years and only have experience with through hole soldering and large components. Today I attempted a repair with a HTC Vive controller. I know where to solder and managed to ...
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How could I give pad to this antenna section?
I have a SC20 schematic diagram.
From the diagram, there is an antenna section as shown.
How can I give a pad to this antenna for drawing PCB in EasyEDA?
The schematic provided some information like 1....
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How do I jump from trace here?
I've been asked to reattach the positive cable that got ripped with the pad from a board given that I own a soldering iron. It seems simple enough to just jump it from a trace.
Scraped a bit of the ...
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Linear regulator with tab at ground
I am searching for a linear regulator with tab connected to GND instead of Vout because it would be easier for thermal management. Unfortunately, all linear regulators seem to have their tab connected ...
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How to repair a solder pad that came off a ribbon cable?
I've similar questions on how to repair solder pads however all the questions so far only talk about solid PCBs.
For some reason the solder pad came off this ribbon cable after I had soldered it ...
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KiCad how to export oval PCB hole as a drill file?
Using KiCad, is there a way to have a pad with an slot shape (referred to in KiCad as "oval") be exported properly as a drill (.drl) file?
The pad in KiCad looks like Fig. 1 below.
But after ...
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Damaged PCB - solder pad missing
have been trying to replace a capicitor on this inherited pcb. Sadly the negative pad for C6 (Orange circle) seems to be missing. Can anyone advise how best to get a capitor seated here?
Thanks.
PS ...
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