The process of mounting electronic components onto a printed circuit board. This can be done manually with a soldering iron, or automatically using a "Pick and Place" machine.

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14
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3answers
1k views

Replace SOT-23 (5 pin) package in production with wire

I have found a hardware bug on a board design after many PCBs have been manufactured but not populated. I can fix the problem by removing a SOT-23 component and putting a wire across two of the pads. ...
1
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1answer
84 views

Can anyone indetify this SMD component?

This is from N9005 phone and i would love to know what SMD component is this. Here is a photo. Thank]1
3
votes
1answer
55 views

How are system configuration flash or eeprom chips programmed?

I've seen, quite often actually, a circuit that will have an eeprom or flash chip soldered next to the application chip. Take a look at the ESP8266, it has some kind of programmable memory that sets ...
1
vote
1answer
74 views

Chamfer the corners of PCB

Almost all the PCBs I've seen for now are right angle. But I think such acute angles are not safe for handing, even when installed on the products, it may do some bad to the wires connecting the ...
2
votes
2answers
145 views

How to avoid solder bridges between LGA-16 pads (paste applied manually)?

I made a breakout board for an LGA-16 part (LIS3DH) and two attempts at soldering failed with a solder bridge between two pads. Top view of the PCB: The land pattern was created according to ST's ...
0
votes
1answer
113 views

What should I consider before purchasing a professional Pick and Place machine?

I am thinking to expand business and go with a professional pick and place machine. Not the most expensive, but not the cheaper ones. I will ask about software licenses/usage, training and post sales ...
6
votes
1answer
73 views

Soldering a male-female bus connector

'Stackable bus connectors' are common nowadays on Arduino and other boards where a single connector has both the male pins (for the board below) and female sockets (for the board above) In DIY ...
3
votes
4answers
1k views

Is it ok to clip component leads after soldering?

When working with through the hole components, I have read that you should clip leads before soldering so the shock from clipping doesn't break the joint. On the other hand I've seen a ton of ...
1
vote
2answers
64 views

Component bodies physically touching

Is it ok when components touch each other (with body, not leads) after assembly? I know that resistors should be ok, but how about capacitors? Is it ok when I assemble them densely? Will there be any ...
5
votes
3answers
679 views

Good way to affordably manufacture low-quantity PCB?

I am thinking about making an open-source development board for a specific field in power conversion. If there is interest from local universities, I will manufacture a few hundreds of these boards. ...
0
votes
4answers
151 views

Small and cheap pcb-to-pcb connection [closed]

I'm looking for a smart way to connect two PCB's in a cheap manner. I would prefer not to use any external components for the connection (if possible). The PCB's are rather small (20 x 20 mm). Do ...
7
votes
1answer
83 views

What initial orientation do pick&place machines use when applying the “rotation angle”?

PCB assemblers require a file describing the component identifiers, the X and Y coordinates of the centre, and the rotation angle. I generate that file automatically from my CAD package (DesignSpark ...
1
vote
3answers
127 views

Four layer PCB, leaks current on edges

I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer. It seems that there are several ...
1
vote
1answer
139 views

Is there a problem to solder only one side of a dual PCB?

If I do a double layer PCB (with the toner method) is there a problem if a solder the bottom side only? there are parts that are so hard to solder from the top layer, do I have to solder everything in ...
1
vote
1answer
138 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
2
votes
3answers
204 views

QFN Standoff (Solder Joint) Height

When designing a QFN footprint, I've read from (reputation limited, only 2) sources... http://www.freescale.com/files/analog/doc/app_note/AN1902.pdf http://www.atmel.com/images/doc8583.pdf ...that ...
2
votes
0answers
50 views

Can flux residue affect sensitive ADC circuitry?

I have designed a product that uses a T.I. ADS1230 20-bit Delta-Sigma ADC. I've assembled 20 prototype boards. Two of those boards are having completely insane oscillations (+30/-30 raw values) with ...
3
votes
3answers
199 views

Steps to ensure greatest success in PCBA production runs?

We periodically get some boards produced and assembled in small runs of 50 - 200. The PCBA company just makes and loads the boards (SMD reflow), we do the programming and testing after delivery ...
0
votes
1answer
117 views

Tethering a TO-92 IC to a PCB

I need to tether a TO-92 package IC to a PCB - as shown in figure below. The cable length would be less than 50mm. Questions: How can I achieve CONN1 - i.e, attaching a cable (comprising of at ...
0
votes
1answer
107 views

How to program modules on assembled PCBs?

Suppose a Bluetooth module like the HC-05 is part of the PCB design. During production, how/when are the modules programmed? Is each programmed before or after assembly? If it happens after assembly, ...
6
votes
3answers
692 views

SMD Crystal solder(?) problem and any recommended test procedure

I use a 32.768 kHz SMD crystal (datasheet) for a MCU. Here is the layout part of the crystal. Here is a view from an actual PCB I mounted the components by hand-soldering, and produced about 30 ...
1
vote
1answer
81 views

I'm looking for a specific replacement PCB module connector [closed]

I wonder of anyone here may be able to help. I've been looking for some time now for a replacement for an old (c. 1980s or early 1990s) PCB module connector. I'm looking for anything similar in order ...
2
votes
1answer
108 views

From what pitch should I consider ENIG finish

My design (4-layer, FR4, 1.6mm) has a couple of ICs with 0.5mm pitch pads and some LEDs with 0.4mm pitch pads, very small LEDs. Should I consider ENIG (more expensive) or will HASL do the job? I read ...
1
vote
0answers
66 views

BOM/OPL parts help before PCB fab

I am completing my first official PCB project. I am outsourcing the PCB fab to Seeeed Studio. I was wondering if any of you might be able to shed some light on my issue. I am using their PCB ...
1
vote
1answer
73 views

SMT reel: taking a couple of parts off the reel

I have a couple of SMT parts that I ordered "digireels" for - i.e., essentially tapes wound around a spool, with some leader tape attached at the front. This is good for the pick and place machine - ...
17
votes
3answers
2k views

What are the 'knuckles' on through-hole LEDs and photodiodes for?

I am using an IR LED and a photo diode, and I have designed the PCB according to the specifications that I found on the datasheet - i.e. hole sizes for the pins being 0.6 mm. However, on these ...
0
votes
2answers
44 views

Can I mount LTC6102 on breadboard?

LTC6102 is a shunt resistor current sensor with the following datasheet: http://cds.linear.com/docs/en/datasheet/6102fe.pdf The package Description has come on page 24. If everything is in mm, then ...
2
votes
1answer
141 views

Should PCBs be rinsed after being cleaned with IPA?

A lot of people recommend using 99% IPA to clean flux (and other stuff) off PCBs. I haven't been rinsing off boards after cleaning with IPA as to my knowledge it's not corrosive, but I'd like to hear ...
0
votes
1answer
50 views

Who is responsible for panelizing solder paste layers?

When creating small PCBs, it is often convenient to panelize them for higher volume production. In my package of gerber files, I include all the layers for one image, and then include a PDF detailing ...
1
vote
0answers
102 views

fiducials on a panel

have a little question about fiducials: My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel. My job is to build the program for the ...
1
vote
2answers
83 views

Suitable FFC socket for this LCD module

I've ordered this LCD module, and I'm trying to find a suitable connector for it. It's 26 pins with pitch of 0.8mm, but as you can see, the right hand side is "sticking out" of the connector. Is this ...
0
votes
1answer
191 views

Maximum protusion length for through-hole component pins

I'm working on a PCB that has through-hole components on both sides of the board. The "top" side of the board is mounted flush to a Delrin plastic block (the only top-side component is a gas sensor ...
3
votes
1answer
1k views

How to generate Assembly drawing in Altium

How to generate Assembly drawing with designators inside the boxes like this in Altium? Is it by placing designators (silkscreens) inside manually? I guess not.
3
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2answers
3k views

Eagle - export pick & place file

How do I export/generate an pick & place file for my board in CadSoft Eagle? Is there a standard (like gerber) for pick & place machine files?
0
votes
2answers
84 views

Inkjet Printers+lamp+unused pcb can It work? [closed]

So suppose I have design x Can I print design x inverted onto paper, shine a lamp on it above unused pcb and make a printed pcb? Sorry for my ignorance Cheers!
4
votes
1answer
257 views

What is this foreign material on my outsourced PCB?

I had this board populated by an EMS house. There is foreign material around some of the pins. They don't know what it might be. Our collective best guess is that it is somehow shavings from the ...
2
votes
1answer
184 views

Is it bad to route a trace edge of a rectangular pad?

I got a quick friendly critic from someone in production for the below trace that I should not route the trace from the edge of a pad. What he said that it would create an extra force to the trace ...
3
votes
1answer
108 views

pick and place cannot read LCC module

The assembly house has a P&P machine (Yamaha i-pulse M4S) and the export file is from Altium. All components are read from the machine fine except an LCC gsm module MG323-b which has a particular ...
3
votes
2answers
161 views

What is the proper zero orientation for a SMT LED?

What is the proper zero orientation for a SMT LED? According to screaming circuits and IPC-7351, the cathode should be on the left for a molded diode. HOWEVER, when I use Altium's component wizard to ...
9
votes
2answers
797 views

Strange Solder Spots on PCB

I was tearing down some old CD drives and while taking a look to the PCB I found two pointy solder spots, connected to the first pin of each side of a chip which makes me think is an EEPROM. There ...
3
votes
2answers
620 views

Why we need the PCB Panelised for assembly?

I have a PCB finished in invidividual size for customer but they gave me comment that it can't be used by their assembly vendor and ask me make the new batch for them, When we make the board in 2 up ...
2
votes
1answer
217 views

PCB assembly cost per-board

I know this question might get closed because of being opinion depended but I couldn't find any answer from google or any other search, so I decided to ask it here. For clarity of question I want to ...
1
vote
0answers
322 views

Single- vs double-sided PCB assembly costs

I'm working on a new design (still laying out the components) and I have a chance here to reduce the size of the PCB by roughly 40%-50% if I use the other side for a QFP-100 IC (so it's heavy and will ...
0
votes
1answer
598 views

Suggestions for in-house PCB/FPC lab? [closed]

We are a hardware startup based out of Greece, looking for in-house PCB/FPC fabing solutions/equipment. LPKF's ProtoLaser U3/S look great but they cost $140K and $70K (if I'm not mistaken) ...
3
votes
3answers
2k views

Solder Mask and Pad Area (SMD vs NSMD)

I have been trying to figure out the "right" way to size pads for surface mount components, and I have found some conflicting wisdom floating around the internets. Lets say I have this hypothetical ...
0
votes
1answer
755 views

Smallest possible PCB size for TI CC3200 [closed]

I'm just getting started with hardware side of Computers. At this point, I'm really interested in TI's CC3200 Network Processor, which has an integrated CPU to allow me to run custom code. You can see ...
1
vote
3answers
187 views

Creating with BGA

I have a project that I've begun to work on, it's sort of an embedded PC type project, with a iMx6 arm processor. However, since this is a (potentially) commercial venture, we can't use prebuilt ...
3
votes
1answer
1k views

Testing procedure for a PCB

I have a little bit of experience with PCB design and made a couple of small circuits for learning purposes. I need to test out a new PCB designed by another person and its kind of a complicated ...
6
votes
4answers
282 views

Export restrictions when sourcing parts for PCB assembly in foreign country

If a company has a PCB design and wishes to assemble them economically, a natural choice is China. Some Chinese companies are asking for the parts (or some of them) to be shipped to them. This means ...
3
votes
4answers
1k views

Holding components without bending leads when soldering upside down?

I am gaining experience in soldering components onto PCBs. I'm working through some one sided through hole PCBs and one thing that I'm having trouble with is holding components once I flip the board. ...