Questions tagged [footprint]
Footprints are the CAD representations of the pads (and other physical/mechanical features) of a board-level component.
201
questions
1
vote
1answer
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 (...
0
votes
0answers
31 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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
1
vote
0answers
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 ...
0
votes
1answer
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
2
votes
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 ...
3
votes
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 ...
3
votes
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: ...
1
vote
2answers
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 ...
0
votes
1answer
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 ...
3
votes
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 ...
1
vote
2answers
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.
9
votes
3answers
2k views
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
0answers
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.
...
0
votes
2answers
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.
...
6
votes
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
0answers
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 ...
1
vote
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 ...
4
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
10
votes
2answers
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’...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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....
3
votes
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 ...
1
vote
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 ...
0
votes
2answers
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
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. ...
0
votes
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 ...
2
votes
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 ...
0
votes
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 ...
0
votes
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 (...
0
votes
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
...
4
votes
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 ...
