Questions tagged [dfm]

Design For Manufacturing - Principles and techniques that are used to ensure that a product is more easily manufactured, has higher yield during manufacture and/or exhibits lower cost of manufacturing. May be accomplished through choice of components, extra circuits for testing through to mundane issues like space for fixturing and labeling amongst many other techniques.

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23 views

Understanding Transition faults

I learned that the transition faults model checks whether data transition meets the clock or not Transition Faults : Assumes large delay defect concentrated at one logical node, such that any ...
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2answers
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How to automatically assemble lithium polymer battery?

I'm redesigning a product for automatic assembly (DFA / DFX). The current product includes a lithium polymer battery with solderable leads, very similar to this: Right now the leads are hand-...
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1answer
73 views

How close can BGA packages be placed to each other? [closed]

I'm wondering if there is some rule of thumb about how close different BGA packages can be placed to each other. What limits that besides pick and place accuracy? I'll ask a few board assembly ...
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3answers
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SMD LED Orientation From Top

Is there a way to determine the orientation of the LED in the image below? The blue squares in the corners seem like they are denoting the orientation however it's not marked in the datasheet. This ...
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0answers
354 views

Do 0402 chip component need solder mask web between the pads?

In my board, all 0402 parts are using gang solder mask. The pad to pad distance is 10 mils. Is there any risk of solder short? Do I need to suggest applying solder mask web between the pads for all ...
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3answers
2k views

Balancing copper on inner layers of PCB

A similar question was asked - What is Copper Thieving and why use it? And my question originates from the comments of the answer in the linked question. I have read and understand that to help the ...
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1answer
94 views

What does this statement about fiducials mean?

Found this slide and I didn't understand the last statement. All fiducials should have same image one layer down Are fiducials not top/bottom layer registration targets during assembly ? Are/Can ...
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1answer
206 views

PCB pads different diameter on top and bottom

When I had a DFM review on a board I have designed, the feedback was that the pads on layer 1 (top) needed to be reduced in size, to: "avoid the issue of copper temperature taking during wave ...
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2answers
778 views

Why are reversed geometry (0306, 0204) capacitors not used more often?

It seems that reversed geometry or low inductance ceramic chip capacitors (MLCCs) are simply better in every spec than regular geometry, and may allow using just one value to bypass instead of two (eg ...
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2answers
110 views

PCB Design Software for work collaboration and minor alterations? [closed]

In my workplace I need PCB software to make minor changes to PCB layouts from our design partners and also to review and suggest changes to incoming designs. Our design partners use x and y. X is ...
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1answer
118 views

Symmetry in routing

I'm moving a design to an 8"x6" panel, and got thinking as I drew the route layer(white). The cutouts on the right two boards will be routed out. The left cutout will stay with the frame. During ...
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3answers
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Via to Pad Clearance

Is it possible to put a via right next to the component pad it is connected to? In other words, if a via and a component pad are on the same net, can they touch as in the image below (red=top layer, ...
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1answer
942 views

Pogo Pins for 1.5mm Pitch Test Fixture

I'm working on a design and am going to source a smaller pcb and solder it to my design. Before using the sourced board I'm wanting to test it and so I'm trying to design a test fixture similar in ...
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4answers
8k views

Are acid traps real? (2014)

Some people online say that acute angles in trace routing will cause these problems: "Acid Trap" - PCB etchant gets stuck in the corner, and eats away too much, causing open circuit "Peelable" - ...
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1answer
645 views

How to make a device in miniSD or microSD form factor?

I would like to design and get produced a device in miniSD or microSD card form factor. This is not actually a memory card, it just uses that connector. There are other devices like that, for ...
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13answers
10k views

How to go from newbie to manufactured?

I'm a software guy who wants to get into the hardware side of things so I can enjoy the same creativity from software design in the physical world. I've found plenty of posts here regarding how to ...
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5answers
12k views

How close is too close for traces on a PCB?

Are these traces too close for conventional PCB manufacture? DRC check advises against it, but I haven't filled out all the settings for it. For scale, the resistors are all 0603.