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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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 ...
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56 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 ...
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295 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 ...
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1answer
53 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 ...
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1answer
230 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 ...
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26 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 ...
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1answer
47 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 ...
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56 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 ...
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0answers
27 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 ...
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2answers
83 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) ...
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2answers
62 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 ...
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1answer
88 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 ...
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60 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
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1answer
221 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 ...
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1answer
345 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, ...
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3answers
94 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 ...
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2answers
64 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 ...
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0answers
117 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. ...
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1answer
73 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 ...
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2answers
122 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 ...
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3answers
99 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 ...
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1answer
59 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 ...
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3answers
159 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 ...
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48 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 ...
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1answer
85 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 ...
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81 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 ...
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1answer
72 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.
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1answer
127 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 ...
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1answer
49 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 ...
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1answer
86 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, ...
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2answers
209 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 ...
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2answers
521 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. ...
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2answers
317 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 ...
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1answer
151 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 ...
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2answers
248 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 ...
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2answers
158 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
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1answer
151 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 ...
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1answer
645 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
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2answers
231 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: ...
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0answers
76 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 ...
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3answers
635 views

0402 Land Pattern

I'm working on the second iteration of a board which uses quite a lot of 0402 caps for decoupling around processors. On the first version of the board I had complaints from the subcontractor that ...
2
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1answer
196 views

LM348 replacable by LM358

I want to give SMD soldering a try and therefore I was looking for some useful circuit (no LED-blink-crap) I could build more or less easily. So I found a nice DIY function generator here. It uses ...
3
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1answer
48 views

Physical stability of different surface mount footprints

While looking for rotary switches to use as user inputs to a processor, I came across these three footprints: I'm considering using a surface-mount part for board layout considerations, but ...
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1answer
111 views

Identify and replace a resistor [closed]

My APC UPS stopped working. I have had it for many years and it was serviced once by APC while in warranty and never opened again. Now since it is not in warranty anymore I opened it and saw two ...
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1answer
75 views

Building a SMT footprint for a MSOP

I'm putting together a board and it's requiring a footprint for a 16 lead Plastic MSOP. Usually I try to dig around and find a manufactures recommended footprint and try to stick with that. I figure ...
2
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2answers
114 views

How to find a datasheet for a part that doesn't exist on the manufacturer's website?

While bored recently, I decided to take apart a few old pieces of electronic equipment and attempt to reverse-engineer them. I've been doing pretty well, but I've come to an IC that I can identify ...
7
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3answers
943 views

Help identifying pwm controller “67A”

I am repairing a battery charger that uses two power supplies. TH20594 (couldn't find any info on that either) controls the primary PSU, while the mysterious chip controls the bootstrap/standby supply ...
2
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1answer
183 views

Are thermal reliefs on SMD pads beneficial when reflow soldering?

I know that thermal reliefs have benefits when hand-soldering through-hole components. For some high-frequency or high-current components, I understand why it's a good idea not to use thermal ...
2
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2answers
98 views

differences between different footprint surface mount RLC components

This is my first question here and I am new to board level digital design(I have years of experience on programming development boards though). So here is my question, what are the differences ...
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4answers
903 views

How can I indicate pin 1 on a SMT package footprint without silkscreen

Sometimes when I order PCBs from a board house, I omit the bottom silkscreen for budgetary reasons. When I place surface-mount chips on the bottom of the board, I then end up with a footprint that ...