Questions tagged [footprint]

Footprints are the CAD representations of the pads (and other physical/mechanical features) of a board-level component.

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KiCad Gerber vs Layout Error

When I look at a certain footprint on my PCB, either in the PCB document, the 3D viewer, or in the footprint editor, the pads all have clearance between each other. However, there is an overlap in the ...
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Offset paste mask from pad on altium

As you can see in datasheet at page 18 of the datasheet the stencil aperture on the right has an offset of 0.1 from each side. I thought it was a typo but after contacting with sensirion they replied: ...
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4 answers
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How to measure distance between two pads' solder-mask clearance in Altium

I'm new to Altium and want to measure distance between two pads' solder-mask clearance using Reports-->Measure. I tried activating solder-mask layer only and then tried to measure like regular ...
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3 answers
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Does the length of a pad's edge include the radius?

I'm making a footprint for a part, and I'm unsure how the length of an edge is defined. I've circled in red the two dimensions that are confusing me. For example, does the 0.1 indicate the length of ...
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How can I adjust the imported 3d body in Altium designer?

I've downloaded and imported the following SMPS transformer 3d model into Altium designer but it doesn't fit my footprint how can I adjust it by changing scales and moving pins?
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How does Altium designer decide the size of the solder mask?

Here is a footprint I created using the footprint wizard in Altium designer. The red is top layer pad. The purple is the top solder mask. Whenever I change the top copper pad size, the solder mask ...
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Why does this LED have three PCB pads in the data sheet?

Please see this datasheet here for QBLP615 LED. The LED part top and side views are contained on page 3. The recommended PCB footprint is shown on page 9. Why is there a middle pad in the footprint ...
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6 votes
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Trouble reading a variable inductor (tunable RF coil) datasheet

I have a trouble reading this datasheet for the Coilcraft 7mm Tunable RF Coils – 146, 150 Series. I see there are two main types of such inductor: with shield can and without it. I'm going to buy one ...
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How to make an L shaped through hole pad in Altium

I need to make a footprint for a USB type C connector in Altium, and two of the shield pads are shaped like an L. Technically this is a component for Altium 365, but I'm not sure that will make a ...
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-2 votes
1 answer
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Coil former footprint?

I am not sure how to make the footprint of this EP10 coil fomer as there is no guidelines in the datasheet. I am meant to assume all EP10 coil former have the same footprint? https://www.digikey.com/...
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1 oz PCB printing for high current power mosfet

I have a power mosfet (STP55NF06FP) used as a low-side switch to cut-off a current of 40 A. Using pcb calculator, I estimated that the trace width is too large (50mm) and as a result I can't connect ...
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-1 votes
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Capacitor selection on Kicad

Can someone assist me in finding the correct footprint for this capacitor? The footprints on Kicad are: What does CP_elec_3x5.3 relate to? What does 3 x 5.3 mean? And the capsize is here:
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How to design PE42441 in Altium [closed]

I've seen the PE42441 datasheet and I want to design the footprint in Altium. Regarding the datasheet, it has a 5*5(32pin) LGA pinout which is not exactly the LGA as I expected. I want to know how you ...
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Is this footprint wrong or am I missing something?

I am looking for a suitable footprint for the ESP32-WROOM-32E module. According to the spec on page 26, the square pads in the center are 7.5mm removed from the border and are 0.9mm wide. However, in ...
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1 vote
1 answer
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How are courtyards on PCB layouts defined?

Let's say I have two premade PCB footprints with courtyards already defined (either from some tool like a footprint generator, from a vendor, etc). Are courtyards usually defined that the courtyards ...
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5 votes
2 answers
399 views

Why do some exposed pads have small tabs, and does my PCB footprint need them?

I've noticed a few component packages now that have small "tabs" on the sides of their exposed pad (thermal pad). One example is the Analog Devices ADM7154 LDO: Note the 0.356 x 0.457 mm ...
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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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0 answers
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Hirose connector footprint comprehension

I am trying to understand how the datasheet of the DF40 series of connector from Hirose describe the footprint. There is a part of the footprint receptacle that is hatched and I don't understand ...
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2 votes
1 answer
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Component footprint symbol cross-reference / cheat sheet / appnote?

While shopping for components I've noticed different manufacturers / suppliers will use different names / codes for identical footprints, which can make it a chore to work out what will actually fit - ...
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OrCAD Footprint in .brd layout different from the .dra file

I made a custom footprint for an 8 pin TSSOP IC, using custom padstacks and creating a new package (no wizard). Each of the four pins on a side are 0.3mm wide and 0.5mm apart (BSC). In the .dra file ...
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1 answer
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Finding footprints and symbols for common components

I am wanting to use a 5x2 IDC connector in my project which are quite common. Most IDC connectors such as this one don't have a footprint or symbol. Which one do I use? Can I use any 5x2 connector ...
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2 votes
1 answer
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KiCad 4 CvPcb: Why does adding a GitHub repo have no effect?

I'm trying to import the NetTie footprint library into CvPcb to implant a net tie into my PCB layout. I added the URL as a global library to the library table, but after clicking OK, I miss anything ...
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1 answer
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Footprint is Driving Me Crazy!

I'm trying to make a footprint for this switch: https://www.ckswitches.com/media/1910/rm.pdf They don't list the XY locations of the pins, just that they are 45 degrees apart but with some trouble I ...
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How do I find this component's footprint?

I have this socket adapter that I need to make a footprint for (the header pin part), but I can't find the mechanical drawing anywhere: https://www.ebay.com/itm/133771173193?hash=item1f25621d49:g:...
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1 vote
3 answers
121 views

Which Kicad footprint represents a 2.2 µF MKP audio coupling capacitor?

I'd like to add six rectangular-shaped 2.2 µF MKP capacitors used as coupling caps for an audio circuit to my PCB in Kicad, but I'm not quite sure about the right footprint. What makes the choice even ...
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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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1 answer
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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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Compatibility of package/footprint names

Whenever I look up footprints and packages of components I am confused by the name, for example: SOT-23 and SOT-23-6 The 6 seems to stand for the number of pins. But for: SOT-23 and SOT-23-3 It seems ...
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Footprint dimensions don't add up

The screen capture below was taken from the datasheet for Pulse's PA2369NL transformer. However, it doesn't make much sense to me. All measurements are in mm. Take for example, the separation between ...
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1 answer
71 views

Why does the footprint change when I add it to the schematic?

I am using "FTSH-105-01-L-D-K" in my PCB design. When I check the footprint of this component directly through library, I can see that there is enough clearance between the pads (please ...
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2 votes
1 answer
102 views

How do I find the center of a part when making a footprint for a component that will be used in a centroid file?

Often the footprint I need is not in the existing libraries and I need to make my own. For example one of the dozens of micro USB footprints. When I make a footprint and then send for assembly at ...
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Is combined footprint for LQFP and UFQFPN packages a good idea?

We are struggling to source STM32L4Q5CG chips due to global semiconductor shortage. Normally I am using LQFP48 package which allows me to easily rework PCB if necessary. But sometimes UFQFPN chips ...
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-1 votes
1 answer
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Three different dimensions shown in package drawing, what do they mean?

I have an IC that uses this package from analog devices: https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_8_5.pdf. Most of the dimensions are shown in three numbers: I ...
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1 answer
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KiCad footprint for a diode

How do I determine what kind of footprint is needed for the RBR20NS60A diode? Its datasheet is linked here.
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1 answer
380 views

What are the boundaries around pads in KiCad PcbNew and what are their functions?

I am learning to design PCBs in KiCad. Right now I am using footprints I found online. In PcbNew I find there is a boundary surrounding each pad. In footprints found in KiCad, these boundaries don't ...
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1 answer
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How to identify pin 1 from mechanical design

Looking at 10142048 datasheet from TE I'm not sure how to identify pin 1 from top side. At page 9 there are the pin assignments from bottom side only. Now, I guess: ...
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1 answer
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AC Plug Type F PCB design?

I am designing a smart plug device. I need an ac plug footprint for my design. I will use type F (schuko) plug but I could not find its design files for altium. Can somebody inform me? Thanks in ...
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0 votes
1 answer
74 views

RF trace matching network component pad sizes

I'm creating an RF connection between a PSoC4 BLE device and the cypress MIFA antenna according to this app note. I'm confused about the pads that are required by the components used in the RF ...
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0 answers
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Import DXF defined padstacks in to Allegro/Orcad PCB

I'm using Orcad PCB Professional 17.4-2019 S017 I've got a symbol with some funky pads on it, one the padstack editor cannot generate. Here's where I'm trying to get to. Green is mask boundary, blue ...
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Looking for a pin-compatible to LT1013DID rail-to-rail in/out op-amp

I have designed a circuit using LT1013DID (SOIC 8 footprint) op-amp and while Spice simulation worked, I forgot about input common-mode voltage limit (which it seems is not simulated) and thus need an ...
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2 answers
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How do I make sure my part matches with the eagle part selected?

I need help matching the part I have with the eagle part. I'm using a RPX-1.0 data sheet pdf: https://www.mouser.com/datasheet/2/468/RPX_1_0-1903909.pdf It is a 3mm by 5mm qfn with 16 pins but it ...
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10 votes
3 answers
858 views

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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2 answers
64 views

Creating a footprint for a component with plastic "bumps"

I think that I can best describe my question by giving two examples: This is a TRS audio jack: https://uk.farnell.com/lumberg/1503-03/connector-receptacle-3-5mm-phono/dp/1216980. It has two plastic &...
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0 votes
1 answer
55 views

Symbol for SAW filter - DEA142450BT-3028A1

I wanted to create a symbol for the SAW filter to use for my project in PADS Professional Designer, but when I try to download the part through "PartQuest" it has no symbol or footprint. In ...
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0 votes
1 answer
105 views

Kicad Footprint Validation Conflict

I am trying to create a simple SMA connector footprint in Kicad but whenever I try to save the footprint to a library, Kicad generates a "validation conflict" error. I have no visibility ...
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2 votes
1 answer
90 views

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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2 answers
257 views

Is it possible to create Altium PCB footprints without designator labels?

I'm pretty new to Altium, have years of experience with Orcad. At the moment I'm in the process of filling a PCB library. Among them there are no-BOM footprints like test points, mounting holes and ...
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2 votes
0 answers
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Altium mechanical layers not showing up in layer selection

edit: I'm dumb I realized I could just press "l" and manually add in the mechanical layers I need I have a few .PcbLib documents, and all but one of them I am able to select lines, polygons, ...
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1 answer
99 views

IPC-7351 vs manufacturer pad dimensions

If I were to make a make a footprint, even for a simple component like a 0603 cap, and the manufacturers recommendation differs from IPC-7351, would it be recommended to start with the manufacturers ...
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4 votes
2 answers
973 views

Are KiCad's horizontal 2.54" pin header and 90 degree pin headers equivalent?

I was experimenting with PCB layout in KiCad and noticed that the Connector_PinHeader_2.54mm > PinHeader_1x06_P2.54mm_Horizontal footprint and a physical 90 degree pin header I have do not seem to ...
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