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Questions tagged [pads]

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2
votes
2answers
118 views

How to create custom through hole pad shapes in Altium Designer?

I'm trying to create a footprint for the ACS770 current sensor in Altium Designer (17.1), which has a quitte irregular shaped pad: ('round' pad shape with slot hole, and then a small cutoff in the ...
0
votes
1answer
47 views

Eagle- multisized capactor connection issue

im quite new to Eagle and currently ran into a problem with the multi-sized capacitor package in eagle. The board layout is shown below. as you can see pin two and pin 3 should in theory be ...
1
vote
1answer
118 views

KiCAD Component Pad Clearances

I'm using KiCAD version 5, and I have an issue with it. Previously, I've been using OrCAD up until the point to where I needed multiple layers for my board. So, I redesigned my components, but I'm ...
0
votes
1answer
136 views

Glue/adhesive/epoxy for soldering a mems microphone

I have read a lot of articles on epoxy and glues for PCB especially with a ripped off pad. I am in the same situation myself and was hoping to get some suggestions here. . The mems microphone looks ...
1
vote
2answers
62 views

PCB contacts for membrane keyboard looks corroded?

One of the keys on my Rigol DS1054Z oscilloscope wasn’t working. I opened up the scope and this is what I found. Is that K5 pad corroded? Other than sanding it is there any other way to restore ...
1
vote
2answers
91 views

SO-8FL Package Footprint Eagle PCB

I am making a PCB with a component that is of the Package SO-8FL. The component is n-channel MOSFET NVMFS4C03N by ON Semiconductor and the datasheet is here. I started to make the package in Eagle, ...
0
votes
3answers
122 views

How to compare footprints of SMD? [closed]

How easy compare dimensions and footprints for different size SMT components. I mean how compare footprints of 0603 with 0402 size components. For example. I want to know is there possible to use ...
0
votes
1answer
63 views

testing no leads packages for pin to PCB pad connectivity

After having spent 4 hours to hot air solder, multimeter probe, apply flux around the sort circuiting pads, re- hot air, re- probe and finally apply wick & iron to get rid of those shorts I am now ...
1
vote
3answers
246 views

Altium pads and holes print PDF

I'm trying to print a PDF to put my PCB design on copper, and I get the PDF document and everything seems to be alright but when I print my design the pads are filled in black. PDF Output And this ...
0
votes
1answer
68 views

How to place an exposed pad (pad should not be covered by stop-mask) on a PCB in Eagle?

I am stuck on a problem while working with eagle. I have to design a pcb which has large exposed pads on the top and bottom of the PCB. I had assumed that placing a tstop layer on the pad while ...
1
vote
4answers
1k views

Standard package footprints

I'm looking for footprint's dimmensions for the standar packages like 0402, 0603, 0805 etc. I did a quick search on the google and I got many different results and I got confused. Is there something ...
0
votes
0answers
43 views

THT decopling capacitor spacing from the TQFP uC's power pin

simple question - how close can the uC's power pin (TQFP pad) and a ceramic cap's PTH pin can get so the PCB fabrication process or later exploitation would not go wrong ? Some ballpark figures for ...
0
votes
2answers
335 views

Why the GND is visible for 2 layer design in PADS layout?

I am facing an error while practicing a reference design of DLP-2232M-G board downloaded from Mentors website. The design engineer of this board has used 2 layer (TOP and BOTTOM ) keeping 3 to ...
2
votes
2answers
306 views

PCB design - how long should pads be made to hand solder half-vias

I have a module with tiny Castellations (Half-Vias) at 1.5mm pitch. They are 0.8mm wide and 0.6mm deep. I am designing a breakout board for this - intended for hand soldering (not paste + pick n place)...
2
votes
1answer
434 views

Eagle CAD pins with same function

I would like to design a tactile switch footprint, where there are clearly two pads and two pins on each side of the switch, but let eagle cad's router know that it can route to either pair of pins. I ...
0
votes
1answer
429 views

Thermal relief for thick PCB traces

A PCB trace that carries considerable current (~5 Amps) needs to be wide, on the order of 4mm. I am concerned that this wide and thick (70mil) trace may cause problems during hand soldering, but can ...
4
votes
1answer
756 views

How to connect same signal pads in Package Editor in Eagle?

So, I'm trying to make a circular pad for a project: To try to make my life easier when changing inner and outer diameters I created a package which consists of 2 pads: one horizontal, which connects ...
4
votes
1answer
129 views

absolute minimum wire and pad sizes for hand-made PCB's

I manage to get the autorouter in Eagle to complete the routing if I use small sizes for the wire and small clearances between wire and pad and wire and wire. Since I'm making the circuit on a ...
1
vote
1answer
236 views

Draw routing on PCB without components

Is there any way to draw routing on a PCB in the software PADS Layout without any components, like the CAD images below? If PADS Layout doesn't work, does Eagle have this function? Also, can I resize ...
0
votes
1answer
48 views

How to to design a PCB lib for components with variable dimensions?

I'm designing various PCB libraries for components. But sometimes they have variable dimensions: How should I design the pads for components with fluctuating values?
3
votes
1answer
61 views

Solder balls and routing out of pad corners

I was approached the other day by a co-worker who claims he avoided routing out of corners of smd pads due to higher odds of solder balls forming. I have so far been under the impression that it is ...
-2
votes
1answer
3k views

Problem with using switches in proteus

i don`t get why when iam using a spst switch with these logic gates the circut dont implies voltage and i have to use that logic gates ()? and another thing how i can make 2 pads in the pcb layout for ...
3
votes
1answer
427 views

EAGLE for 10 layer boards with 337-ball BGA?

I have been using EAGLE for some years. The boards I have designed had the following specs: up to 4 layers 6mil spacing densest package: QFN, 0.4mm pitch only "ordinary" vias mainly (low frequency) ...
2
votes
2answers
2k views

Purpose of oval/oblong PCB through hole pads

What is the actual purpose of using the oval/oblong pads that are commonly used for ICs? Everywhere I read the answer is the possibility to allow a track between the pins, but as long as the pad ...
0
votes
1answer
77 views

Pad size of power jack

I want to use a dc power jack in my circuit, and I chose this. After eagle does not have this schematic, I have to draw it on my own. Unfortunately I do not understand the pad size dimensions. It ...
7
votes
1answer
771 views

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 ...
3
votes
3answers
2k views

Cleaning filthy PCB pads

I am looking at this PCB board I've got and these pads are terrible looking. It still works, but this sure doesn't look right. What can I use to clean those up?
1
vote
1answer
1k views

What are input/output buffers for pads?

As an embedded software engineer I am familiar with "application-level" (if I may call them) pads configuration, such as; function (GPIO, i2c, etc), direction (input or output), active high or low, ...
0
votes
1answer
246 views

Repair (fixing back) lifted power thru hole pad+trace

Attached pictures are a lifted power pad+trace of a 1000W PSU of a commercial subwoofer. Caliper showed 0.42mm thick, which if correct gives about 12oz copper trace! In this particular pad was the ...
1
vote
2answers
2k views

Import DXF file into PADS Logic

I have a drawing border in DXF format that I need to get into PADS. Is there a sensible way of doing this, without needing some add-on software?
2
votes
1answer
855 views

Cutout a polygon from another in any layer in Eagle CAD part creation

I am trying to create a part with a bespoke pad. How do I cut one polygon (for where the hole will be) from the original pad polygon. I don't just want to make a dimension layer and let the PCB house ...
1
vote
2answers
8k views

Altium PCB, plated or unplated pads without hole, what is the difference

When I place a pad, there is an option Plated. Here is the picture What is the difference between plated and unplated pad without hole?
5
votes
2answers
667 views

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 ...
6
votes
2answers
8k views

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. ...
3
votes
2answers
3k views

Rule of Thumb for PCB pad sizes of SMD devices?

I am trying to make a PCB for the first time and am concerned about the sizes of the soldering pads over the actual dimensions that I should realize on the board. That is, with the following diagram: ...
1
vote
1answer
1k views

Typical minimum silkscreen-pad spacing

What is a typical industry figure for the minimum spacing between silkscreen and pads? When I look at a manufacturer's general list of capabilities, sometimes this number isn't even listed. I haven't ...
2
votes
1answer
1k views

Is the shape of (SMD) pads relevant?

SMD pads come in basically two shapes: rectangular and rounded rectangle. Does either offer advantages? For instance for etching, or HF signal integrity?
3
votes
3answers
487 views

How are these LCC module pads laid out?

It seems like there's something missing. I can't figure out how the rows are spaced relative to each other. The pitch is 1.257mm. The distance between the centers of 17 of them is 20.112 -- that ...
13
votes
1answer
1k views

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 ...
4
votes
1answer
407 views

Contact pad size for microprobe coaxial to planar waveguide transition

http://www.ggb.com/t-4.html Can someone explain what size one should choose at minimum/maximum for the pads and what role the pitch plays (besides impedance matching)? If I order a 100 micron tip ...
2
votes
1answer
933 views

Programmatically generate padstacks for Cadence Allegro

I am laying out a complex board, with many components. One of the steps is to create padstacks for the footprints of each component. It turns out I have (nearly only) two types of padstacks to ...
4
votes
1answer
1k views

Why are the pads different for THT / SMT components in Eagle?

I am learning Cadsoft Eagle and have noticed that the pads for SMT devices are on the 'top'/'bottom' display layer, whereas the pads for THT components are on the 'pads' layer. Why is this? I have ...
4
votes
2answers
105 views

Thermal relief style X or +?

Is it there any differences between a thermal relief in a 'X' shape for a '+' shape? I am using Altium and the software has boths styles for selection.
26
votes
5answers
9k views

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 ...
2
votes
2answers
3k views

What are thermals?

I was looking through various options available for Eagle CAD through-hole and SMD pads and I noticed a "thermals" option. The documentation wasn't much help in determining their function other than ...
9
votes
3answers
4k views

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 ...
4
votes
3answers
352 views

SMT pads on both sides of the board

Is it possible to put SMT components on both sides of the board with the pads touching? I don't want the pads to be electrically connected, but my PCB program (gEDA PCB) warns that they are shorted. ...