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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2
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2answers
308 views

Non plated through hole to PTH

I have defined Plated through holes on my PCB design.But somehow my pcb manufacturer has drilled it as non plated through hole and PCB has arrived.Now I need a suggestion to convert this non plated ...
1
vote
3answers
50 views

how to get a breakout made for module that doesn't have one?

I'm just starting out in this field and I got ideas for projects I want to build but I'm running into problems, not so much with how to find the part I want or how to get it to work. but how to ...
0
votes
1answer
36 views

Best way to prototype a TDFN package chip (MAX9814 and MAX9820)?

For my engineering project, we wanted to use the gain control and amplifier available on these two chips, but are finding difficulty with prototyping them as they are so tiny. One of the chips is a 14 ...
3
votes
2answers
113 views

Possible to Solder top of through-hole header?

I have designed a small 2-sided PCB with through-hole parts, which I plan to have fabbed professionally. Given the lack of space (2"x2" was a design constraint to keep costs low, as I will need a ...
0
votes
1answer
34 views

TVS unintentionally shorting on USB?

I had a very peculiar situation on a PCB I am working on, and the only possibility I can think of is that my assembler installed the wrong chip on my board. I'd like to present it to the forum to see ...
1
vote
0answers
30 views

how to identify pads of a chip antenna?

I am using a chip antenna called ACA-102-T. The linked document says that Pad No1 is the input pad, and Pad No2 is the ground short pad and an example circuit I am going to solder the ...
0
votes
0answers
43 views

How to Clean Solder Stencils?

I have had great success in the past using the reflow soldering method, using a syringe and needle to apply the paste to the board. However, I found myself repeatedly making the same boards so I ...
14
votes
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
vote
1answer
90 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
74 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
108 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
215 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
117 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
90 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
73 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
709 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. ...
1
vote
4answers
235 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
89 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
152 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
184 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
150 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
314 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
62 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
221 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
136 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
122 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, ...
7
votes
3answers
847 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
85 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
130 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
83 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
77 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
47 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
170 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
52 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
117 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
92 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
243 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
2k 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
votes
2answers
4k 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
88 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
262 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
197 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
118 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
178 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
816 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
706 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
251 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
358 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 ...