Surface-Mount Technology (SMT) refers to the way components are mounted on a PCB: SMDs (Surface-Mounted Devices) have pins or contacts which lay on top of the PCB's pads, without the need for holes in the PCB.

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2
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1answer
100 views

Need help with a vertical mount, male A USB connector

I need to figure out a way to get a Male A USB connector to vertically attach to a PCB. Ideally, we wouldn't use a surface mount right angle connector. Any help would be greatly appreciated! Most ...
3
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2answers
64 views

How to manually place 0.5mm pitch bga

I'm a hobbyist and I'm trying to place a 0.5mm pitch BGA with tweezers. I've yet to land the chip properly on 3 attempts. At ~$30/board, I need a better way. What are my options? I've seen some DIY ...
0
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0answers
110 views

Esp8266 (esp-03) breakout

Recently, Hackaday is talking a lot about the esp8266, a wifi to serial chip. I want to use the esp-03, a breakout with half-hole connectors that has 2mm pitch. Is there a breakout board that can turn ...
1
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2answers
103 views

SMD size 0805 vs 1206

Using SMD to make the PCB smaller is an easy choice but I'm wondering if using mainly 0805 size is really worth it compared to 1206. I don't want to store a mix of both. These are some pro and cons, ...
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1answer
53 views

Can i replace a 0.75A 76V SMD fuse with a 1.25A 250V one? [closed]

It's for an LCD TV inverter. The seller said I could even use a thin wire. I'm not sure about that that's why I still bought it but I want to make sure before putting it in. It seems that it's for ...
1
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0answers
86 views

Surface Mount vs Through Hole Aluminium Electrolytic Capacitors?

What are the differences between SMD and TH Aluminium Electrolytic Capacitors? Why are TH variants available with such greater lifetimes? (For example, Digi-key has SMD aluminium caps up to 10k hours, ...
0
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0answers
78 views

Why are there so many SMD resistors near CPUs and GPUs? [duplicate]

I'm not really sure if these SMDs are resistors or capacitors, but I've always wondered the purpose of them. Supposing that they are resistors: Do they work as a sort of protection measure? Current ...
1
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3answers
123 views

Need help with an LED flash circuit

I joined just because I'm having sort of a dilemma. I need to design a flash circuit for a tiny SMD based project, and I have a way of doing it, but I want to see if I can make it better and I haven't ...
1
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2answers
122 views

Choosing an SMD LED size

I am designing a PCB an need an LED on it. I'm going to direct the light from the LED using a light pipe, so I need it to be as bright as possible. The question is what size I should use? All the ...
1
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4answers
132 views

How to protect trade secrets on board with SMD components?

I have a design which uses a secret technique, and I would like it to remain secret, at least for a period of time. My plan was to pot the board in epoxy. Specifically, MG Chemicals 832TC is ...
0
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1answer
94 views

ATmega 328P SMD version

Currently I am using the normal ATmega328P chip with my barebone Arduino I have made. I am planning to switch it with an SMD version of ATmega328P, since it's smaller in size it will consume less ...
0
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2answers
82 views

How to identify SMT transitors

im trying to identify the following 4 transistors, but am having trouble tracking them down. The one that I think is the dual transistor is marked .1Ft on top of it, and the other three leg one is ...
4
votes
3answers
356 views

How can one organize SMT parts prior to/during PCB assembly?

Suppose one is hand-assembling a board with many SMT components. Unlike THT, SMT components are often not labeled. This means that having two different kinds of parts "out" at the same time is a ...
2
votes
1answer
87 views

What is the name the IC package which is SMD version of DIP in the same dimensions?

There is an optocoupler which comes in DIP package. But it also has an SMD version of the DIP package. This SMD package is not SOIC, because its pin pitch size is 100mil instead of 50mil. What is the ...
3
votes
1answer
249 views

What are the contact pads near the ATmega32 chip on the Arduino Yun?

What are/What use have these pads near the ATmega chip? I thought they are used for testing or something else, they seems to expose the ATmega traces directly. Maybe they can be useful to connect ...
1
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0answers
27 views

Can I change a design from using one polypropylene cap to four PEN/PET caps in series?

I've inherited a design for a SEPIC converter that uses a polypropylene input filter capacitor from CDE. (Specific part number 715P472516LD3.) I'm considering shifting this design to surface-mount ...
0
votes
1answer
90 views

SMD diodes identification

I'm trying to identify the SMD components on a contactor control circuit. They are from General Semiconductors and have the labels: YR103, WX104, and RZ102. I think they are diodes, but I'm not sure ...
0
votes
1answer
75 views

Soldering CPUs/GPUs/FPGAs - temperature issue

I am thinking about making my own FPGA board and soldering using reflow. The tutorials I've read all say the process requires temperatures in excess of 220 °F. However, at least according to this ...
0
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0answers
35 views

How to rework bridging on an edge castellation RF module

I'm not sure if the solder paste was bad or the oven didn't reach the peak temperature, but when it was done there was some bridging between the pads that connect the edge castellations on the RF ...
1
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2answers
94 views

Identifying different chip packages

I wanted to buy an opamp for experimentation. I ended up with LM324. I searched the web and they come in different packages. For example, take a look in these two pictures. (source) (source) ...
4
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2answers
88 views

Size of SMD pads for components with high tolerances

I'm building an Eagle component for an LSM115J. The connectors on this part have fairly large tolerances (1.85-2.21mm width, 0.76-1.52mm length). There is no recommended land pattern. Should I go ...
1
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1answer
96 views

Red light therapy LED spotlight

What's the easiest way to mount a bunch of surface mount LEDs into an array or spotlight? There are a bunch of very interesting new papers on red light therapy for a variety of conditions. I want to ...
0
votes
1answer
113 views

Minimum voltage rating for output capacitor for use with LTC3525-5 boost voltage regulator

I'm (still) selecting parts to build a 3 to 5V boost DC-DC converter using the LTC3525-5. The board I'm planing to build is based on the typical application shown in page 11 of the aforementioned ...
4
votes
1answer
264 views

SMD Removal Process

I'm practicing my SMD soldering skills and done my research on how to remove SMD devices from a PCB motherboard and brought a T8280 PREHEATING STATION and 852D SMD station. I understand you have to ...
7
votes
1answer
375 views

LTC3525 datasheet states that capacitors must be X5R or X7R, not Y5V. Why?

I'm selecting parts to build a 3 to 5V boost DC-DC converter using the LTC3525-5. The board I'm planing to build is based on the typical application shown in page 11 of the aforementioned datasheet, ...
0
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4answers
200 views

Surface mount capacitor marking

In general... 1206 resistors have their value marked on them. Why don't 1206 capacitors have their values marked? The only reason I can guess is that marking them would somehow change their ...
0
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2answers
72 views

Is airbath + air gun reflow appropriate for low-volume commercial production?

I understand there are a number of ways of reflowing individual SMT boards. I've seen small temperature profile ovens, hotplates, skillets, airbaths, and hot air guns used. I'm trying to determine ...
0
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0answers
200 views

SMD component identification

I need help regarding identification of an SMD component , the package is SOT223 package. I checked many code books but couldnt find the marked number. ...
0
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1answer
91 views

SMD Code Parts BE P04 & AE P04

I'm looking to find out what these parts are on a PLC controller. Both are SOT-89 packages. The AE P04 I suspect maybe something to do with a constant current circuit for +24vDC for a 4-20mA loop ...
3
votes
2answers
149 views

What is a good lab surface to hot-air rework on?

I have been scouring the internet for information regarding what would be a good surface to do hot air rework on. Right now, my lab, if you want to call it that, is a wooden bench with cardboard ...
3
votes
3answers
123 views

How to connect 1.5mm SMT alternating pins to 0.1" pin header?

I have a toy I'm trying to rehabilitate - the microcontroller was fried and I'm attempting to replace it with an Arduino. It looks like the connections were at a SMT pin-pitch (1.5mm spacing). To ...
1
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1answer
72 views

10GHz Regime Differential to Single Ended Conversion

I'm looking for a board mount (IC) solution that will take the differential output of something like ONET1191 @10GHz and convert it to 50 or even 75 Ohm single ended. I've looked through various ...
1
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3answers
167 views

How can I “print” traces on the back of a ceramic package?

I have a project I'm working on that is so tightly packed that I'm totally out of room. I could save the whole thing by slapping a bunch of surface mount LEDs (30 of them) on the back of a ...
0
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0answers
55 views

Pb-free reflow soldering of thick packages on PCB

We have a PCB board with approx. 600 SMT components (various IC, passive components, etc.). This board is to be assembled by our manufacturing house and they do use a reflow oven to solder our ...
2
votes
1answer
129 views

SMD component clearance limitations and guidelines?

I'm laying out a fairly compact PCB (first SMD design of this degree) and am concerned about how close some of my SMD components are getting. I've been unable to find any guidelines or advice online ...
0
votes
1answer
143 views

How can I adapt a 8-WFDFN Exposed Pad to a breadboard?

I got a few of these:http://www.digikey.com/product-detail/en/DRV8837DSGR/296-34806-2-ND/3471184 without looking close enough at the package type. Is there an adapter for this so I can fit it on to a ...
1
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1answer
82 views

Fiber-coupled diode laser in an SMD package?

Does anyone manufacture a fiber-coupled diode laser in an SMD package? Something like this, but smaller.
0
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1answer
162 views

SMD capacitors for a guitar distortion pedal

I'm trying to build a guitar distortion pedal. Alright, a bit about the motivation behind this project : It's my friend's birthday in a couple of days and I wanted to get him a distortion pedal cause ...
-4
votes
1answer
54 views

Identify part number of a surface mount device

I have a commercial data logger to gather data from a heat flux sensor. The sensor puts out a signal in the microvolt-range. This signal is amplified before it gets logged. I think that I've located ...
1
vote
1answer
98 views

DIY SMD - options for covering exposed vias?

I printed a PCB + got a kapton stencil made for a project I'm working on. One of the components is a BGA chip, and has vias close to the bga pads. The vias on the board don't have solder mask on them, ...
-2
votes
2answers
424 views

1N4004 SMD replacment [closed]

Please help me, how do I find the corresponding equaivalent of 1N4004 Diode. Also as not everything is available in local market here in India, I would appreciate, if there are some well known ...
9
votes
2answers
734 views

Is it possible to attach leads to surface mount component?

I ordered an op amp to experiment with. I knew this was a surface mount component when I ordered it. I assumed that I would be able to somehow attach leads to it, so I could use it on my breadboard. ...
1
vote
2answers
462 views

How does power dissipation for surface mount components work?

I know that with usual through hole components we can attach heatsinks etc. But how does it work with surface mount components? Is having a copper plate around the component the way to go? How do we ...
2
votes
1answer
239 views

Why are SMD Diodes different Packages than Resistors and Capacitors?

I was looking for SMD Schottky Diodes on Digikey, and they all come in weird packages like SOD-123. There were some that were 1206 or 0805, but they seem fairly rare. Why is this? The only difference ...
6
votes
3answers
540 views

KiCad : How can I create a footprint with thermal vias?

I have a SMD chip that gets pretty warm when operating and I want to try and design a footprint that allows more ventilation and extra copper to keep it in range. Does anyone know of a tutorial that ...
6
votes
2answers
160 views

Soldering guidelines for freezer applications?

I'd like to do a home project where I take temperatures inside of my freezer and inside liquids. Liquid-compatibility aside, I'm mostly curious about whether or not anyone can recommend some best ...
4
votes
1answer
199 views

What standard governs the dimensions of SMT chip resistors and capacitors?

I am aware of the JEDEC registered outlines, which define the standard mechanical dimensions and tolerances for a wide variety of solid-state packages. However, these standards do not appear to cover ...
0
votes
1answer
867 views

Soldering underside pads of Teensy 3.1

I have to place this Teensy 3.1 on a PCB, I am planning to make the PCB such that it has headers on which the whole Teensy will fit. Essentially, it is similar to making a shield like we make for ...
2
votes
2answers
312 views

Rule of Thumb for PCB pad sizes of SMD devices?

I am trying to make a PCB for the first time and am concerned about the sizes of the soldering pads over the actual dimensions that I should realize on the board. That is, with the following diagram: ...
1
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0answers
87 views

Standard for right angle SMD LED?

I'm trying to specify a SMD LED which has "right angle" mounting, ie edge mounted, with the light going parallel to the horizontal PCB. I need a RGB version (tri-color). Example. As usual, there ...