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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497 views

Eagle: library with only common packages

is there some library with only common packages, but not compsed with devices? I use components from many sources and either I would end with tons of librarioes, or with tons of differnet models (...
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68 views

Which are the correct pins for this footprint?

I'm creating a footprint for M140T01-AE0507A micro switch. The datasheet does not mention which symbol pins correspond to the device pins. I guess pin 1 is COM, but I don't know what the other two ...
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568 views

Cost effect of different component packages during PCB assembly

We are looking at starting PCB design in house, up until now we have outsource design and manufacture. This means that we have yet to see the real cost of the PCB, components and assembly as discrete ...
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2answers
196 views

Kicad CONN_3X8 schematic component?

I am designing a prototype board in Kicad. I need CONN_3X8 schematic component and footprint module for connecting 8 off-board <...
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1answer
637 views

Designing a breakout for crenellated (castellated?) pads

I am brand new to PCB design, so far all i've made a simply 555 timer circuit with an led, a few resistors, a capacitor and a 555 timer and got it printed by OSHpark. That was my first experience ...
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4answers
5k views

Standard package footprints

I'm looking for footprint's dimmensions for the standar packages like 0402, 0603, 0805 etc. I did a quick search on the google and I got many different results and I got confused. Is there something ...
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3answers
867 views

Unable to change package footprint solder pad size in eagle

as the image shows, I want to change the BGA soldering dots from current size to something larger. Only size changes, or shall we say diameter changes, no shape or anything, but I couldn't. I clicked ...
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1answer
596 views

Are there surface-mount pin header footprints for KiCAD?

I'm designing a small module that breaks out a DIP SPI EEPROM to a 2x5 pin header socket(more info here: SPI-10). I want to mount the socket on the end of the board, with the pins lying parallel to ...
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1answer
368 views

How to create device variant with different pin count in Eagle?

I have a part that has 2 variants SOT-23-3 and SOT-23-5. Both have different schematics as one has 3 pins and other 5 pins. Package is also different due to difference in pin count. The problem is ...
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Parts footprint list in Orcad Capture

I intend to design my first PCB and i am using Orcad suite. So, i built the theoretical circuit and before proceeding to the next step i have to put the footprint values for each part. I have decided ...
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2answers
903 views

SOT23-3 Pin out: IPC or Datasheet?

IPC-7351 gives a pin out and a 0 degree rotation for SOT23-3 packages; but, IC vendors use many different pin numberings. When I make my library component should I use the IPC pin numbering for all ...
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2answers
100 views

Dimension of Component

I need to have a dimensio for a component however i could not be sure about it. I need "x" distance that i mentioned below. This is the datasheet drawings; In my opinion it should be x=1.3 mm Can ...
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3answers
660 views

Altium Panelizing

I want to send my board to production however i am not sure a component's actual sizes because there is not enough information on its datasheet. I put its image and the necessary dimension "x". This ...
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1answer
209 views

Using a component footprint drawing as a guide in Altium Designer's component editor

Just copying a footprint drawing image from a datasheet, placing it as a temporary background guide in the PCB component editor, scaling it and using it as a rough guide in conjunction with the grid ...
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4answers
214 views

is there any problem with these via-pads?

I'm designing a footprint . in this pictures we have vias and pads and i want to know is there any problem with that? i mean I've heard somewhere that something like this is a technology named via-in-...
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Why do the Sparkfun and Adafruit Eagle libraries use smaller footprints than the manufacturer's recommended land pattern?

I'm comparing two datasheets from Micron and Infineon to the Sparkfun and Adafruit footprints for TSSOP-28 Both the footprints use an SMD pad size of 1.0x0.3 mm, while the manufacturers recommend ...
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3answers
2k views

Altium: Place a component “inside” some other component

I have a problem with Altium, and unfortunately, I don't even know how to google this one. I have a board (Switch board) that is connected to another board (User interface board) via a board-to-board ...
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Altium: what layers these parts in this picture are?

I'm going to create foot print of D-sub sdf-us91-95. in its datasheet this picture of holes is shown. but what are the layers of others and generally what are they?
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Why do datasheets include Tape and Reel information?

Specifically: - Does a PCB designer need to be concerned with tape and reel information? - Is the information intended for PCB assemblers, pick and place machines, etc? - Will a pick and place ...
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1answer
104 views

Altium: Find schematics which use a footprint from the library

If I search for an item, and I find it's footprint, can I find which schematic/part it was referenced to. E.g. finding corresponding wiring/schematic symbol? Thanks in advance for your help.
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Why do KiCad's library footprints for 0402 resistors and capacitors have different pad sizes? [duplicate]

KiCad's default library footprint for C_0402 is longer than R_0402. Why?
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1answer
899 views

Wrong footprints in KiCad

I am designing an audio amplifier and I realized that the footprints that came with KiCad are wrong. I connected the transistor Q9 like this: But in the CvPCB, the transistor appeared like this: As ...
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2answers
2k views

Rotating components in Altium Designer, clearance

I can't find out how to properly rotate 45 degrees components in Altium Designer. I read two topics about that: Rotated component placement in Altium How can I rotate a part in Altium without an ...
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1answer
2k views

BNC connector schema pins

I am making a PCB using Eagle which features a few BNC connectors. Eagle comes with the RADIALL R141426161 component so I'll just use these instead of searching for other ones. The component has the ...
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1answer
87 views

Footprint of L6226Q

The L6226Q H bridge is using a QFN32 package. Actually in the datasheet, it has this layout: and it was noted that the pins 2 to 8 are connected to the die PAD and the die PAD must be connected to ...
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Why would metal from a pad be *underneath* the solder mask in a footprint specification?

One of TI's new regulators has a rather unusual footprint, with several pads (7-13 in this instance) requiring that the pad metal extend under the solder mask. This is in contrast to the usual case ...
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1answer
407 views

Update Altium designer schematics library and keep values unchanged

Whenever I choose a schematic library like a resistor and use Tools > Update Schematic button, all values of resistors that are set in my schematic document are reset to the library default value e.g. ...
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2answers
501 views

How do I create the layout for this rotary encoder on a pcb?

I am very new to designing boards and I am trying to do a board layout that contains a MODEL EN11-HNM encoder but I am not sure how to handle the tabs that provide the mechanical strength while it is ...
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1answer
605 views

Creating a new library: Pin association to footprints [Kicad 4.0.2]

I'm trying to create a library for Lipo battery connectors. I started with the most common connector XT60. I drew the schematic, and then drew the footprints. On Eeschema, I can connect my XT60 to ...
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2answers
1k views

Grove connector SMD footprint dimensions

I'm creating layout for my PCB and I want to use Gvove connector in SMD package (http://www.seeedstudio.com/wiki/images/e/e0/3470120P1.pdf). But footprint from the datasheet doesnt have all the ...
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2answers
283 views

SIM900 Footprints do not match in Eagle

I am designing SIM900 circuit in Eagle. To test the circuit I saved the board layout in pdf and took its print out. I placed the ...
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1answer
184 views

USB3.0 Shield connection

In the below image for Amphenol GSB343K33HR, do the 4 rectangular pads in the center of the image signify Shield connections?
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Understanding connector footprint on PCB

I wish to make a footprint for Amphenol GSB343K33HR connector that I am using on my PCB. I am however having difficulty in understanding the PCB layout that has been mentioned by the manufacturer in ...
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3answers
3k views

IPC Specification for pad width vs. pin width (SMD)

I am working on a board that has a fine-pitch component (0.35mm). Each pin is 0.15mm wide. I received a question from the manufacturer asking if they could adjust the pad width from 0.22mm to 0.18mm +/...
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1answer
844 views

HM-11 Bluetooth Footprint

I'm using HM-11 Bluetooth module and is in layout process currently. One of the concern raised by my friend referring to the datasheet is whether the footprint lead dimension is the same in bottom ...
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2answers
945 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
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4answers
4k views

Coin cell battery retainer, problems and best practices

I use Memory Protection Devices BK-913 CR2032 Through hole battery retainer. I use Adafruit's CR2032 PCB footprint, which is almost identical to the recommended footprint in the datasheet for the ...
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1answer
2k views

what is the meaning of 'landing pattern' in designing IC footprint?

I am designing the footprint of an IC using this tutorial http://dangerousprototypes.com/docs/Cadsoft_Eagle_how_to_make_parts_tutorial In that they have mentiond: "Important: It's very important to ...
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1answer
162 views

Is it possible to make a footprint off an assembly of pads in a gEDA PCB layout?

I have spent hours carefully assembling a couple of pads to form the footprint of a Bourns PEC11S rotary encoder. Now I'm stuck in the procedure I know, i.e. «Cut to buffer», «Split buffer elements ...
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2answers
4k views

Altium Database and Footprint density

I am currently trying to use the database in Altium, but I have one big question: I was expecting to get one database entry per resistor value. But, for a single 100k 0805 resistor (for example), ...
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2k views

What component does the 'coupon' label refer to in terms of PCBs?

I was looking at a motherboard recently and I found a couple interestingly labelled component footprints. They're two through-hole mounted components right next to the CPU, and they seem to be called ...
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4answers
2k views

What does “V.A.” mean in datasheet dimensions?

I'm looking at a datasheet for an LCD panel (pdf link to datasheet). I don't understand these two encircled dimensions: What does the acronym "V.A." mean for these dimensions? I have ...
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1answer
2k views

Extracting footprint existing PCB in Altium

I'm in the process of designing a carrier for an existing PCB. The upper layer of the carrier should contain pads to connect to the holes on the side of the original board. I can re-create the lay-...
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3answers
2k views

How bad is it to places vias under a QFN thermal pad?

I'm working on a PCB which has to be very small. There is a QFN IC which has a big thermal pad, although it doesn't really need to dissipate that much heat. So to save some space, I came up with the ...
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0answers
53 views

placing hermetical packages on PCB and soldering

I stumbled upon some hermetically enclosed packaged - Link. The package has a small bulge/projection on the bottom. This makes the package leads basically float without contact with the PCB. How do we ...
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4answers
3k views

8x1 header in OrCAD

I'm trying to create a LCD Arduino Shield for the Arduino Uno using OrCAD. I want to add 8 pin through hole to solder headers into them. However, the 8 pin header in OrCAD library under Connector ...
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3answers
8k views

Move silkscreen text from component on EAGLE CAD

How can I move a silk text from a component? I cant use the button move to the text and when I click smash nothing happend. I need to move the number 8 inside the board Edit1 I try to smash but ...
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1answer
7k views

Through-hole footprints: pad size from technical drawings

I'm creating some footprints for through-hole components in KiCad, and I've got some issues determining the correct pad dimensions from manufacturer's technical drawings. As an example, here's the ...
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1answer
114 views

Missing pad tCream

I've just finished my first component footprint and then I figured out that there is a pad without tCream, which I guess it is generated automatically. What could be went wrong? By the way, does it ...
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1answer
7k views

Pin dimensions on PCI Express card edge

I can see this as being 50/50 between here and Eng.SE, so I decided to ask here as it deals with the PCI Express standard. I'm attempting to create a library of PCI Express card edge footprints in ...