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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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55 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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34 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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45 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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62 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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104 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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61 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
43 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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29 views

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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2answers
50 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
47 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
198 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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72 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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1answer
93 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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105 views

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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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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207 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
51 views

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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2answers
76 views

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
140 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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68 views

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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200 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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1answer
873 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
124 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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69 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
119 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
432 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
77 views

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
207 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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45 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 ...
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595 views

‘One for all’ standardized land pattern v.s. specified land pattern in datasheet

I’ve designed lot of ‘simple’ PCBs for hobby and proof-of-concept purposes, but never for (mass)manufacturing. In order to do so in the future, and further expanding my design skills and knowledge, I’...
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1answer
177 views

Keepout in Solder Mask in Altium 17 for SD Card Connector

I am creating footprint for Amphenol's SD Card Connector in Altium Designer 17. The datasheet shows ...
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1answer
587 views

Creating a slotted & plated through-hole in EAGLE: where to draw milling outline

Problem summary I want to create a rectangular slot in my PCB for this component. Do I draw the milling outline on the footprint library or on the board after placing the component? Does it matter? I ...
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1answer
120 views

Crystal 4 Pins SMD footprint

I'm designing PCB that includes 24MHz SMD 4 pins crystal. According to my understanding, the crystal package marking is for Pin number 4. I wonder, how should I indicate in the PCB this pin? Should ...
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1answer
45 views

AM437x ZDN (N491 BGA) Footprint Dimensions

I have downloaded and studied the layout that TI provides for the TMDSEVM437X AM437x Evaluation Module. After calculating some distances, I concluded that the pad size used for the ZDN footprint is 0....
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2answers
336 views

Usefull 0402 and 0603 solderbridge footprints compatible with machine manufacturing?

I am currently in process of my eagle library cleanup, and came up with the idea to create a footprint similar to the one from nucleo boards. Those pads are meant to be easily bridged by just solder ...
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2answers
343 views

Altium Designer IPC Footprint wizard error for chip components

It is the first time I am designing a PCB with surface mount components. I am trying to generate footprints for 0805 resistors and capacitors, and 1210 capacitors using the IPC footprint wizard which ...
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159 views

Altium Polygon pour

I am designing a PCB in Altium. I finished my routing and proceeded to Polygon pour for Gnd plane. I was surprised to find the pour in between my 0805 caps pads as well. Although, I don't have a top ...
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2answers
366 views

edit component in *.intlib library

I have a previously used a resistor component in my project that originated from an *.intlib library. Now I want to use an alternate footprint. However, I cannot access the .schlib file of the ...
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2answers
174 views

How can I attach the same footprint to subparts of the same IC in Altium?

I have two sub parts of the same IC (STM32L476RG). I have added these sub parts as two components in the same schematic library and have attached the same footprints for both of them. But when I ...
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1answer
237 views

Smd footprint Altium

I'm trying to make the footprint of a smd resistor. But when I place the resistor on pcb layout and flip it, the pads go on bottom layer but the body remains on top layer, viewing from 3D mode. ...
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1answer
48 views

Is there a popular footprint for right angle SMT LEDs?

I am designing a PCB with SMT LEDs at the edges. The LEDs have to be right-angle type (ie. shine sideways). With regular LEDs I can use an 0805 or 0603 footprint and tell the assembly house to place ...
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2answers
763 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 ...
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1answer
837 views

Defining a circular cutout in a pad in Altium

I'm creating the footprint for a Wurth inductor, 744043100. The recommended land pattern is below. They use a radius 1.8 mm circle in the middle of the component to define a void in the pad. I'm ...
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1answer
131 views

LM2596 TO-263-5 or TO-263-6

Hi just a dumb question that I have to be sure. I will be using LM2596 It is stated in its description: IC REG BUCK 5V 3A TO263-5 That its package is TO-263-5. But on its package is TO-263-6, D²Pak (...
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2answers
149 views

first pin of package LQFP

this could be most stupid question but i couldnt find where is the first pin: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11157-32-bit-Cortex-M4-Microcontroller-SAM4E16-SAM4E8_Datasheet.pdf ...
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1answer
305 views

Strange footprint labeled PJ## on laptop's motherboard

Today I came across a picture of a laptop motherboar (below). I noticed three strange looking small footprints, labelled PJ12, PJ36 and PJ37. The J may stand for jumper, and on the top left corner ...