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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Pad size of power jack

I want to use a dc power jack in my circuit, and I chose this. After eagle does not have this schematic, I have to draw it on my own. Unfortunately I do not understand the pad size dimensions. It ...
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42 views

Replacing a Piezo with a button

In my senior engineering design class for high school, my teacher bought a toaster oven and microcontroller and tasked my group to make surface mount digital dice kit for him to teach surface mount ...
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0answers
22 views

SMD thin/thick film resistor in external Magnetic field

I have an application where the need is to use SMD and MELF type resistors that have tolerance of 0.05%. I prefer the Vishay thin film resistors. Then comes another constrain -> The entire PCB needs ...
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3answers
106 views

What soldering kit for tiny electronics? [duplicate]

This is a my first foray into building electronics. I am building a project that uses chip/SMD LEDs and resistors. What type of soldering kit should I be using for those devices?
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1answer
36 views

What's the ID nr of this SMD transistor?

Need to replace this transistor, SOT-23. Any ideas on ID?
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1answer
56 views

Which SMD footprints can be hand soldered and which can't? [closed]

This was the first question I had once I was given a project that didn't restrict the use of SMD components. I feel like there are a lot of different SMD footprints out there, and surely it's been ...
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1answer
57 views

High Power LED connected to Dry battery

I am new to electronics as i love working with circuits. I have 12V 6W SMD LED, which I want to attach with Battery Powered Driver which currently gives me from 10v-14v DC with 50mAmp. Shall I connect ...
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1answer
60 views

IC chip for PCB to stabilize 12v input?

Hi I'm wondering if there's any SMD IC chip to stabilize a 12v input to a stabilized output? I need something like that to regulate power on PCB. Thank you.
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2answers
55 views

Is there a way to fix a unsoldered SMD decoupling capacitor?

I'm rather a newbie regarding electronics but I came here to seek for a simple response. I realized that a electronic appliance I have doesn't work anymore. I tried to investigate the issue and found ...
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3answers
83 views

Is it possible to solder this non-standard package (sim900) using hot-air station?

I don't have any experience with hot-air soldering. Would it be possible for a complete newbie to solder this kind of package using a hot-air station: I only need to solder pads closer to the edges ...
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2answers
80 views

How do I solder a surface mount (smd) voltage regulator?

I have a PCB in front of me with a surface mount 5V voltage regualator. I'm wondering how I got about soldering this with just solder (I don't have paste). I have heat paste, but I'm wondering if ...
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0answers
104 views

Tips for soldering delicate smd ICs without smd equipment

Lets say I have a physically rather delicate part like a MAX6143AASA50 (a SOIC-8 package, the one I am going to solder, but the exact chip doesn't really matter) and want to solder it, but don't have ...
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2answers
63 views

Figuring out pin configuration for a small SMD transistor

The data sheet of the dual transistor IMZ1A shows pin layout as: But the chip I received looks like this: There is a small dot on top left, but according to the datasheet, pin 1 should be on ...
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1answer
38 views

How robust are SMD DC power inlets compared to through-hole?

Normally it takes a reasonable amount of force to push in a (say) 2.5mm DC low voltage plug into a PCB mounted socket. For that reason I have normally only used through hole devices. How do the SMT ...
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6answers
1k views

How to hold SMD parts in place while soldering?

I go through this every time I have PCBs I need to populate with SMD parts, and this has become more an issue as pin spacings have gotten tighter, and my hands have become less steady with age. So ...
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2answers
88 views

How to break out SMD chips in-circuit?

For a current project I am attempting to amplify and cross-wire the signals from the address pins of SMD RAM chips. Basically this means I am trying to break out the pins of a SMD chip, similar to how ...
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2answers
113 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?
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3answers
166 views

Violin bow position tracking with SMD LEDs and photoresistors

Objective: Marking labels indicating the positions of the violin bow on an acoustic signal, for example, a single musical note played by a full-length bow. The following video shows the example I am ...
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1answer
72 views

Any help identifying these parts and their purpose

Short: I'd like a manufacturer identified. Long; I've been tearing apart old electronics and looking at them to see how they work and getting caps, op amps, transistors, small logic circuits and the ...
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3answers
364 views

0805 LED on a 0805 resistor footprint?

The LED in question is described as 0805 dimensionally. However, the footprint in the PDF is different from that described as being suitable for a resistor. For example, the gap between the anode and ...
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2answers
83 views

Standard SMT button size? [closed]

I need an SMT pushbutton on my PCB. I'm drowning in options on Mouser and just want to select something that is future-proof. Is there a standard size and footprint for pushbuttons that I can use to ...
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2answers
90 views

Use expensive or inexpensive capacitor for decoupling

I'm in the middle of a project to create a small development board using a 100Mhz Cortex M4 MCU and have to buy some decoupling SMT capacitors. I've found the following options: Cheap 10 cent from ...
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1answer
139 views

Altium Creating Custom SMD Pad Shape

I tried to create a custom pad shape in altium desginer 14 for my pcblib but i missing a option in altium to assign a designator to the region. i already assigned solder/paste mask and now placed a ...
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0answers
18 views

Murata SMD External Drive Pizeo from SBC

I would like to drive a Murata SMD from a SBC (Arietta G25) with a 3.3v Logic PWM output. I've looked through the Murata catalog and seen the examples however I'm still confused as to how the circuit ...
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1answer
80 views

Solution for broken pin repair (SMD(SMT) components)

While I was working with a IS62WV51216BLL-55TLI, I broke off by chance a pin at the base near the component body. that's perfect! LoL! It makes me to think about this question: Can we fix such ...
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3answers
376 views

Find first pin of a LQFP chip

I have bought some ATSAM4E8C chips in LQFP 100 package. The datasheet shows that the IC should have a dot indicating the first pin, but mine have two dots. One larger in the corner, and a smaller ...
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1answer
115 views

How to program a msp430 without bootloader or ISP connector?

I'm looking for a way to program a msp430 microcontroller in-circuit and with all the components SMD, including the ISP connector. Could, in this case, USB still be an option?
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2answers
159 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 ...
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2answers
85 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 ...
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1answer
310 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 ...
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2answers
380 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
81 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 ...
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0answers
110 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, ...
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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 ...
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3answers
155 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 ...
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2answers
170 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 ...
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4answers
150 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 ...
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1answer
141 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 ...
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2answers
101 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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3answers
404 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
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1answer
126 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
256 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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0answers
30 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
220 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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1answer
100 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
47 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
107 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
129 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
105 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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1answer
157 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 ...