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 5 ‒ Is ist possible for a footprint to have multiple courtyards?
One of the components I am using is really a daughterboard that plugs into two rows of pin headers. Under the daughterboards, between the pin headers, there is space for a additional components. I ...
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Reducing Thermal Pad Size Below Official Footprint - Can It Create Manufacturability Problems?
I'm using a DP83867 Ethernet chip by Texas Instruments in an S-PQFP-G64, 10 x 10 mm package, the mechanical dimension and its recommended footprint are shown at the end of the question. As shown, the ...
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How to merge polygons into a single pad?
I need to create a pad in a PCB footprint, This pad is created using these 3 polygons but I dont know how to merge them together into one pad. I am using Altium 17.
edit
Thanks to Chris's comment,It ...
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49 views
Texas Instruments Step-Down DC-DC Converter orientation
I have a Step Down DC-DC Converter IC, purchased from Texas Instruments.
Part number: TPS54331
Datasheet: www.ti.com/lit/ds/symlink/tps54331.pdf?ts=1599690098737&ref_url=https%253A%252F%252Fwww....
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Maintaining clearances in HV MOSFET footprints
I'm thinking of making a prototype PCB which would use a bridge rectified AC, which will end up with peaks around 350V in my area (+/- some smoothing). It's a through-hole design and the circuit will ...
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Importing Altium schematics to a PCB is placing some components on a forbidden and an unaccessible area
I was using Altium 16 and generating PCB from schematics with no room generation. I have created my components library by mostly using "ultra librarian" files. I do these steps as many other ...
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53 views
SOP-4 Package Footprint Standard
I've got a TCMT1102 Vishay optocoupler. Its a 4-pin SMD part but there is no standard package type associated on the datasheet - i.e SOP, SSOP, TSSOP etc. Vishay has a footprint document that ...
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PowerElement footprint confusion
I am attempting to use some of ERNI's PowerElement parts but the associated datasheet and catalogue does not appear to be clear on the associated press fit feet
https://www.erni.com/en/products-and-...
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Any advantage in AC-DC or DC-DC with past, large form factor semiconductors?
I want to clarify this question with my real-world example:
Say you have a device which contains some AC-DC converter (or DC-DC) for rather high power specs (10 kW up to 300 kW, not in the same ...
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What's the smallest footprint dual H-bridge?
I am designing a circuit with 4 small electric motors. The motors I selected are SMT and are driven by 3V power source. It makes sense to drive each pair of motors by a dual H-bridge, but I can't find ...
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Altium error: “net contains multiple output pins” on LT3045 chip
I have two concerns:
Is it okay to have "contains multiple output pins error" in Altium?
Is anyone familiar with LT3045 chip? Its datasheet applications only have 1 "IN" pin and 1 ...
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149 views
Why have the same chip in the same package, but with a different number of pins?
STMicroelectronics offers the following two accelerometer chips.
The LIS2DW in a 14 pin LGA package
The LIS2DW12 in a 12 pin LGA package
These two chips are functionally equivalent and have the same ...
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3answers
125 views
KiCad footprint or supplier footprint?
I download symbols and footprints from the component supplier into a project's library to go faster but I realized that many of the standard components footprints are slightly different in KiCad, like ...
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Custom Altium footpring
I want to design a concentric circle shaped footprint in Altium. The inner one is Vcc while the outer is GND. I tried placing the pad and such but there is no way I can have the outer circle with the ...
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Are only standard footprints ever used? What if a manufacturer wants a devices footprint but the manufacturer doesn't list it?
They want a BOM like this but the part I want doesn't list a footprint. It lists the components dimensions and then you have to make the footprint yourself so I don't think there is a standard name. ...
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129 views
Altium Collision DRC error? Cant figure out why
i have finished my PCB design with Altium. I ran the DRC, to check if there are any errors. Strangely i got like hundreds of errors. First i couldn't find out why, but i managed to narrow it down to ...
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addition of external footprint to ki cad
I have downloaded a .stp file of MAX14878 foot print. I tried to add it to the library through manage footprints options. It shows a table where it is added. But I am not able to find it during edit ...
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In Altium Designer how do I navigate to the component editor from the PCB layout screen?
I am teaching myself Altium Designer 2017 coming from EAGLE. If I want to edit a component in EAGLE I can right click on it in the board view and then click "open footprint". Is there a similar ...
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39 views
Number of pins of elements
I've created a footprint for the rotary encoder, which symbol is shown below
A footprint for this element has been done by myself.
I've been getting a warning which goes like this:
"WARNING(ORCAP-...
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1answer
66 views
Heatsink land pattern interpretation (DPAK heatsink)
I'm looking at using a D Series heatsink from Ohmite. The land patterns on the last page of the product PDF are very lightly labeled and I'm not entirely sure how to interpret them https://www.ohmite....
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Can't select component in Altium
Some time I'm facing to an annoying issue when I want to select some component. I want to be clear before, that is only for one component and it not relative to select filter or anything else.
I ...
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How to integrate external library into KiCad
I am using KiCad (5.1.5). I got this self-made library from my lab mate he told me to make some changes to his schematic. Inside the folder that he gave consists the following folders and files:
...
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Who is creating/maintaining the Unified components for PCB?
In Altium, I noticed that there are 'Unified components' - the repository that contains symbols/footprints that are already created. I am keen to know more about this repository. Who is maintaining it?...
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TE Shrack miniature relay datasheet confusion
This relay (TE part number 1393219-3) datasheet has the following drawings in it (below). I am trying to make PCB footprint for it, and having issues with dimensioning.
Length = 20 mm max
Footprint ...
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Eagle >Label attribute (in some Adafruit parts)
I'm using an SMA edge launch connector from Adafruit's part library. Alongside the usual >NAME and >VALUE text it also has ...
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Design my own footprint or find one?
I am designing a PCB based around the STM32H7 MCU, which is a LQFP144 package. I'm designing in Altium and was using the Altium vault to find components.
I noticed my specific MCU isn't on there, ...
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116 views
KiCad: Can I insert a net name into a footprint?
I'm new to KiCad, and using version 5.1.5.
I want to make a simple single-pad footprint, with a text label that is the net name to which the corresponding schematic pin is attached. Is there a way to ...
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2answers
67 views
What is the correct name for a footprint that connects to a panel mount component?
Let's say you have a panel mount switch. When you create the footprint for this switch, you aren't creating it for the switch itself, rather, you are making a footprint with holes for the wires that ...
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1answer
205 views
PCB Footprint Design Dimensions
I am trying to make a Eagle library for a Micro USB B connector. The library is unavailable and I decided to make one with the datasheet dimensions provided.
But it is rather confusing.
The units are ...
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Making Daughterboard Symbol and Footprint With Multiple B2B connectors
I am using Allegro/OrCAD.
Suppose I have a PCB module like the one below, which contains multiple B2B connectors and is meant to mount to be plugged into a larger PCB:
Each B2B connector has its own ...
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eagle library model for STM32F730R8T6
I'm designing small DSP device, currently I've been using stm32 development board but now I need to move to dedicated PCB. I can make footprint for uC myself, but I believe it should be available ...
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120 views
Assign existing footprint to existing component in Circuit Maker?
I found the following two components in Circuit Studio that I am using in my design:
AOD407:
And IRLR8726:
The manufacturer recommended footprint is exactly the same for both, and they use the same ...
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Molex USB Micro AB Eagle Package
I am creating a package for Molex's MicroAB USB 47590-0001 component because I could not find one for Eagle. My question is will this work to create the custom slots as seen in the datasheet? I've not ...
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303 views
What is name of semi-cut headers in KiCAD?
I'm looking for a "semi-cut headers" footprint in KiCAD.
Saying "semi-cut header" I mean a footprint which you can use either for soldering traditional pins or solder your board on ...
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3answers
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KiCAD: Triaxial Connector Footprint from Drawing
I am planning to use a PCB-mount triaxial connector, CBBJR79TL, in a design for a laboratory prototype. Making reference to the "recommended mtg hole pattern" section from the CBBJR79TL drawing, I ...
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433 views
SMA connectors minimum distance on PCB
I am designing a board, which will have several SMA connectors.
I am mainly concerned about the minimum distance between SMA connectors on the board, since we need also account for the size of the ...
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48 views
How to read this component mechanical drawings
I am adding a display to my small hobby project. And due to size and cost constraint the choice falls on Chinese QG-2864KLBLG01 OLED display. Everything about it seems to be perfect except one small ...
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68 views
PCB Connector Footprint - Through Hole Diameter - IPC Standard and Datasheet Specification
I'm creating a footprint for a molex PCB connector (Drawing PDF here).
The datasheet contains a section for PCB layout.
For the connector leads it states a diameter of 1.02mm with 0.04mm tolerance.
...
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1answer
89 views
What is the difference between courtyard top and top overlay?
I am creating my first assembly drawing and have noticed that my ECAD tool generates a footprint with a top/bottom overlay and courtyard top/bottom.
Top Overlay is the silkscreen, but what is the ...
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293 views
PCB Pads vs Components Footprints in PCB design
I want to understand the process of PCB design using a software like Altium. I have come across two approaches as follows:
Approach 1: While making the component parts library we make the footprints ...
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299 views
Errors were encountered loading footprints: kicad_plugin.cpp : FootprintEnumerate() : line 1786
I am newbie in working with KiCad So for first time i tried to generate footprint of one negetive voltage source from here and here:
And the Sketch is like this :
button and i get this error in my ...
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102 views
Why footprint dimensions are to edges and not centers
Whenever I'm looking at electronic components, I regularly see footprints with this kind of thing:
Dimension E seems to me to be somewhat unhelpful; rather than simply reading the centre distance (...
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214 views
Altium rules help: keepout region around mounting point throws collision errors for the mounting point itself
I'm working on an Altium footprint for a plated mounting hole with embedded vias arranged around the hole. I have the copper the way I want, but Altium is now throwing DRC errors at me that I'd like ...
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78 views
Analog Devices `SOIC_N` and `MSOP_N` Recommended Footprints
I do not know if this is on topic, but which are the recommended footprints dimensions (or a reference document) for the SOIC_N and ...
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1answer
295 views
IPC-7351C polarization mark in real-life?
I know IPC-7351C is not released and probably won't be for... forever? The draft version of IPC-7351C differ from what's out there in the wild in many ways. For example, the draft uses a bar instead ...
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66 views
Footprint unclear part
I am trying to draw a footprint of some component which has 8 pins but in the document they shared for outline dimensions and footprint:
Outline dimensions
Footprint
There is some rectangle in the ...
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1answer
150 views
Why does SOT89-ECB footprint exist?
Because of an oversight a part that has a footprint SOT89-ECB (PNP-BJT), ended up on my board, but when I tried to find a transistor that actually has compatible pin configuration I came out with ...
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154 views
KiCad problem, schematic to PCB layout generates empty PCBnew window
I am using KiCad 5.0.0, after I built my schematic I annotated schematic symbols, assigned PCB footprints to the schematic symbols, then generated the netlist, and finally when I clicked on the tab of ...
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49 views
should land patterns match the typical or the maximum part footprint dimension?
I've read that for QFN packages at least, the width of the pads on the board should exactly match the width of the feet on the bottom of the chip. However, the datasheet for the part I'm working with ...
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How to update a packaging made in an original design to the one previously used in another design Proteus
I'm working in a design in Proteus where I'm making a multi-board design. I've made a previous design where I've made a PCB model of an ESP8266-ESP01 but initially I was mistaken with the pin ...
