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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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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2answers
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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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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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63 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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178 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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22 views
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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47 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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45 views
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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78 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 top of other board....
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3answers
72 views
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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120 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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1answer
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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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1answer
30 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
46 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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1answer
101 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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105 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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60 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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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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1answer
49 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
94 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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1answer
63 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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108 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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1answer
102 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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1answer
47 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 ...
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61 views
Altium IPC Footprint wizard Generating Dodgy Components
I've started using Altium Designer 14 after a break and needed to build some components I started with a EP4CE10 FPGA, but I noticed that despite following the component guidelines as close as ...
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2answers
156 views
Eagle Drill vs. Diameter Parameters when making Through Hole Parts
I am working on making footprints in Eagle for a through-hole connector I want to use. I am running into some issues as I try to determine the appropriate diameter and drill size I need for the ...
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1answer
204 views
What does the minus sign mean in measurements in datasheet footprint drawings?
I have seen this more than once where there is a measurement such as "4-0.7". In this context, it clearly does not mean 4 to 0.7 mm so what does it mean. See the attached picture:
Link to datasheet: ...
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132 views
How should I interpret numbers 3 and 4 on the footprint schematic?
I am creating a foot print for this PoE magjack and was wondering how to correctly interpret the symbols for 3 and 4 on page 5. From the schematic, these pins get wired but I am confused as to why ...
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1answer
125 views
Does anybody have PCIe (3.0) aka PCI Express module card edge connector technical drawing? [duplicate]
I was searching through the internet to find PCI Express card edge connector footprints / technical drawings / pin spacing / layout of the module cards that you stick in these connectors you can find ...
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190 views
KiCad 5.1: New footprint from existing footprint
Is there a way to duplicate a footprint in one library into another for making changes? Or "create new footprint starting with existing footprint"?
I want to make a footprint for Adafruit's Itsy ...
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Altium Designer 19.1.5: very dark 3D preview, black footprints
Anyone facing the same issue? How this could be fixed? Tried to do a clean install, but it doesn't help. I'm on Windows 10 with all the recent updates.
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3answers
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Unrecognized IC Package Style
I'm implementing the NXP TDA19988 HDMI transmitter IC in one of my projects and I am currently in the PCB design stage. I am building my component library and when I came across this part I wasn't ...
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529 views
Altium Properties Panel Missing?
I was wondering if anyone had ever encountered the case where Altium's properties panel is completely missing. In my case for both schematic edit and PCB footprint edit, I can't find the properties ...
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1answer
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Understanding PCB footprint for ESD321DPYR
Looking at the datasheet for component ESD321DPYR, the PCB footprint looks something like this (copy and paste from page 16):
However, the footprint I downloaded from Library Loader here, a trusted ...
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1answer
19 views
Does the 969973-3 SMD receptacle need mounting holes?
I am designing a board that uses a 969973-3 wire-to-board receptacle. In its drawing there are specified six 1.2 mm (mounting?) holes.
Does anybody know what are they used for?
I've seen pictures ...
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Reflow soldering, pin longer than pad?
I was designing the footprint for this FPC connector: Datasheet
The recommended land pattern is shown here:
The issue I encountered is that the pins on one side protrude outside of the pad:
I ...
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1answer
169 views
How do I read the dimensions to create a PCB footprint?
I'm trying to make a PCB footprint for the SSD1306 ribbon strip, and am unsure of the correct dimensions for the solder pads. The horizontal dimensions are clear enough but I don't know where the pads ...
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1st KiCad design. Concerns with an abnormal circuit
I just wanted some input before sending this off for manufacture. It is for a test fixture and just has a funny circuit. Even though it seems relatively straight forward, it took a bit of finagling.
...
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2answers
247 views
Connector footprint JAMMA
JAMMA connectors are card edge slots that were common in arcade games before cheap SBCs. They are designed for fairly high current (5A) and are robust and cheap in a range of sizes from 8 to 72 pin.
...
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887 views
THT: What is a squared annular “ring”? [duplicate]
At least in KiCad, the footprints of through-hole pin headers have one squared annular “ring”, the other ones are round:
What does the square indicate?
(Also I’m wondering if there is perhaps a ...
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1answer
149 views
pcb-4-pin passive crystal is soldered to a 2-pin crystal PCB package
I would like to know whether it is suitable (not harmful) to put a 4 pin passive crystal in a 2 pin footprint.
Thanks in advance.
I have a 2 pin footprint in my PCB board,however,I only have a 4 pin ...
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2answers
62 views
Grid like footprint on kicad for RPM5-3 component
I'm developing a PCB in KiCAD which uses the RPM5-3 DC power module from Recom. (Link to datasheet)
I created my schematic symbol and now I'm creating the footprint according to the datasheet ...
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78 views
Footprint panel is grayed on Altium Designer PCB
This is a project I imported from Eagle (not so bad by the way). I resolved all schematic compilation errors. But now I am facing some small issues in the PCB part:
On the properties panel when I ...
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1answer
152 views
Interpreting USB-C land pattern
I'm replacing USB Micro and USB B connectors on my PCBs for USB-C connectors, but only using USB 2.0.
So I'm looking for a connector that isn't too complex to layout or hard to solder. I found this ...
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3answers
462 views
Modifying land patterns generated with IPC-7351B wizard
I generated a 4x4mm 0.45mm pitch QFN28 according to the Atmega328P datasheet:
However, the pads on the corners (1+28, 21+22, 14+15, 7+8) are too close to each other, less than 0.2mm apart (when ...
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2answers
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IC has different pinouts on different packages? [closed]
I am going to use the HT16C21 LCD driver to drive my LCD.
Looking at the datasheet (in the "Pin Assignment" section), I noticed that the IC comes in 4 different packages, each with varying numbers of ...
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1answer
295 views
Altium Clearance Constraints on USB Receptacle Footprint
I made a manual footprint for a USB micro-B receptacle that is now giving me problems on my PCB in Altium Designer 16.
Here's the footprint drawing that I was going off of:
And here's what my ...
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48 views
PCB design - paste coverage calculation for exposed pad (TL;DR version?)
I have created a Web tool for creating solder mask and paste mask for exposed pad:
https://jsfiddle.net/d1wang/5t6urzwo/
The idea is get around limitation of DipTrace and help automate footprint ...
