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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SOT 23 package marked as A1⌐

Im currently trying to repair a board and I found this SOT23 component marked as A1⌐ (last symbol is a 7 but rotated 90 degrees to the left, I think). In the board is marked as D15 so I assumed ...
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22 views

Cant Find 1N967 SMD Variety [closed]

I cant find any SMD packaged 1N967 Zener Diodes, do the SMD variety of this diode have different part number?
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2answers
86 views

Are SMT components bad for high voltage applications?

Majority of the assembly factories are asking for SMT jobs. My gut tells me through hole would be a better option for a high voltage application. Before the high voltage project is started, we need ...
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1answer
67 views

Battery connectors: how are they called?

How is this 3 pad connector called? I'm trying to build something similar into a product but can't seem to find anything similar.
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3answers
108 views

How to make perfboard circuits more compact

So, I've been working on my prosthetic limb for quite some time, and I've sorta bumped into a few problems, while the circuits I've made work, they don't fit inside the arm. Mostly because I have tons ...
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1answer
36 views

Thin film SMD resistor reliability

I am hoping someone can point me toward some clarity regarding the durability of thin film SMD resistors. Google pointed me toward a number of pages that indicate they are sensitive to humidity and ...
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3answers
83 views

Rotary encoder to 2 buttons

Please excuse me if this question is a very obvious one, I have searched on here but my electronics knowledge is very very basic. Here's what I'm trying to do, I have taken an old Android phone ...
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3answers
65 views

Magnifiers for SMD soldering [closed]

I need some some Magnifier for SMD soldering so I bought these Magnifying glasses: http://www.ebay.com/itm/381555608061?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT It is good for PCB ...
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1answer
34 views

How to safely remove SMD piezo-buzzer from QI charger?

I have a QI charger which goes by title "Solomon SQI-500". Whenever device is placed on the charger last makes annoying beep. I suppose I located this buzzer at the board of device and there it is on ...
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3answers
65 views

Why do smd components in eagle have padding?

I'm new to eagle and I don't understand why there is a small padding to the left and right of some SMD components (for example the 0402 cap in the image). Having the physical board in my hand ... ...
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2answers
3k views

Why are SMD LEDs shipped in a sealed bag containing desiccant?

I had a selection of 0805 LEDs in my last Mouser order and was a bit surprised to discover they arrived in heat-sealed (rather than folded and taped with sticker) bags containing a desiccant bag and ...
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70 views

Identify components on a SIEMENS PLC 1214c board

This is a 1214c PLC it has 3 boards : power-board ( 220 ac to 24 dc ) and a IO board A/D and a main-board . this PLC has failed after a power-cut also it didn't have a ground connection. In an ...
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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 ...
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1answer
180 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
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5answers
119 views

How to test SMD bluetooth modules without soldering them to a board [duplicate]

I have made a costum PCB with components and a WT51822-S2 bluetooth module. After testing, there seems to be a low percentage of modules that have a fault in them. Since they are SMD modules, with ...
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1answer
66 views

Ease of use of SMD Led components [closed]

I was thinking about inserting some lights in postcards. But classic leds would increase the thickness too much. Is it easy enough to use this kind of component for a simple circuit(just one or two ...
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0answers
35 views

qrd1113 vs qrd1114

Does anyone know the differences between qrd1113 and qrd1114? The datasheet doesn't include any information on the topic.
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2answers
170 views

What are the disadvantages or advantages in using larger SMD resistors and capacitors?

Are there tradeoffs associated with usinng SMD resistors or capacitors larger than a 0805 footprint? As the footprint becomes larger what considerations should be made?
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4answers
80 views

Advantage of using SMD components

I know that SMD components are smaller in size compared to their through-hole equivalents. They enable a designer to reduce overall pcb size. Is there any other advantage of using SMD over ...
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2answers
102 views

Identifying SOT-23 IC: N59M

I got a couple of SMC network switches (EZ Switch, SMCGS5, HW rev. A1), of which one is broken on account of something applying 12VDC to the 5VDC input. Looking at the broken switch's PCB, I can see ...
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2answers
253 views

Any idea on what this component is?

It's an 0402 sized component. Measures about 50 milliohms out of circuit. I also measured it with a cheap LCR meter and it shows -47nH. Capacitance measures 350mF. So I'm pretty sure it's a jumper. ...
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2answers
115 views

Please help me identify the SMD component in the picture (or help me fix my Wacom)

Could anyone help me identify what type of SMD component the one in the red circle is? The label seems to be ID but I can't really tell very well because it's so small. My guess is that it's a diode ...
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1answer
98 views

Reverse engineering a high side MOSFET driver SMD circuit board

I am trying to reverse engineer a high side MOSFET driver smd circuit and I have a few components. I am trying to gather data for it. One is a diode with markings ...
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1answer
39 views

Can 5630 SMD on LED strips be RGB?

Hi I've been trying to look online for RGB 5630 LEDs strips but I can't find any. All the strips I've found carried 5050s which give a max of 1020 lm/m more or less.. Any idea if strips carrying ...
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1answer
43 views

DIY SMT Reflow 48LQFP

I am new to this forum. I am building a prototype board which uses a 48 pin LQFP 0.5mm pitch IC including other components. Included on the board I have 1206 SMT components and SOIC components. All ...
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1answer
73 views

Game Boy Camera – How to identify this connector?

I want to get another male socket for the JST-looking connector that the 1998 Game Boy Camera uses. I haven't been able to identify it though – the pitch looks to be exactly 1.5mm center-to-center. ...
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2answers
51 views

Led SML/SMT and resistors R/M

I am making a PCB with Eagle and I need to place some leds SMD size 1206. Looking components, I see two different types of LEDs in this size: SML and SMT. Eagle components are LEDSML1206 and ...
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98 views

Colpitt's Oscillator: How do I set the output peak to peak voltage of the oscillations?

Good day, we are currently working on a VCO project that uses a transistor based Colpitt's Oscillator. We were asked to select a frequency of operation where we selected 89.1MHz as its center ...
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2answers
139 views

LD1117 / SO-8 heat dissipation

I'm new to SMD, and was thinking of using the SO-8 package for the LD1117V33, which I'm using to step down from 6v to 3.3v, running at about 50mA max. I was noticing that while the other packages ...
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2answers
237 views

Why are there no SMD AC Power Connectors?

Is this just a matter of having the wrong search terms, or is there a reason why there are no SMD AC connectors. They all seem to be thru-hole, like this: I can imagine several benefits to an all ...
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1answer
52 views

Placement of two independent crystals

This one is completely about PCB layout. I have two 26MHz crystals in the design, one for each processor on the board (TXC 7M-26.000MEEQ-T, datasheet: ...
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3answers
58 views

Surface-Mount Prototyping (AXL 335 & SFH 7050)

I'm working on a senior project and I'm having some trouble prototyping with surface mount components. I know you can find SMT adapters out there for most SMT chips and components, but I've been ...
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51 views

Automate Noise Sensitive Designs of SMD For 95% Sensitivity [closed]

I am thinking of automating my noise sensitive designs of high sensitivity in SMD: maintain 95% signal sensitivity by adjusting the factors (1-3) in the thread What is the best way to layout a PCB ...
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1answer
29 views

Difference between ADUM6403 and ADUM6403ARIZ?

I bought ADUM6403ARIZ and I am thinking how it might fit ADUM6403. I am thinking the differences between the two chips ADUM6403 ADUM6403ARIZ ADUM6400ARIZ should be equivalent to ADUM6403, but not ...
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2answers
171 views

100nF MLCC bypass capacitor spontaneously exploding on 3.3V bus, how does this even happen?

A 1608/0603 multilayer ceramic chip capacitor was functioning as a bypass capacitor for the 3.3V supply of a InvenSense MPU-6050 6 axis (gyro + accelerometer) MEMS sensor. It somehow exploded forming ...
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1answer
104 views

Desoldering a TO-220 MOSFET from a plated through-hole board with SMD complications

I'm planning on replacing a TO-220F package MOSFET on a through-hole circuit board that also has SMD components on it. In this case, an SMD capacitor is connected to the source gate of the MOSFET by ...
2
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1answer
129 views

Change only one side the roundness in SMD

I'm doing my own component in Eagle for a PCB design. This is the footprint that the manufacturer gives: But I have a problem with the SMD roundness when I try to draw the SMD footprint at the ...
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1answer
94 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
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301 views

Preparing solder paste for syringe-style dispenser

I've been hand soldering SMD components for years and recently decided to buy a cheap solder paste dispenser hooked up to an air compressor. One of these with a 30cc syringe: I don't know much ...
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1answer
94 views

How do you test SMD ICs that are not soldered to a PCB?

To be more specific, let's say I have SOP16 SMD chips that have been purchased from overseas. I have several PCBs that they need to be soldered to, but I don't want to risk paying for assembly and ...
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1answer
87 views

Burning bootloader on atmega1284 tqfp

Is the process of burning a bootloader (JChristensen's mighty-1284 to be precise), on an Atmega1284 microcontroller same for both DIP (Atmega1284p) and tqfp (Atmega1284-au)? While searching online ...
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1answer
113 views

Possible to identify burnt component and its value?

The device is a Banana Pi M3, I accidentally short it out when I was playing around with my multimeter on the GPIO pins.... A noticeable spark came from that component in the above picture circled in ...
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161 views

Are SMD microcontrollers less affected by noise than DIPs?

Are SMD packages of microcontrollers (to be more exact : AVR mega series) less affected by noise rather than DIP packages? Or the opposite is true? By noise I mean anything that can disrupt the ...
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2answers
174 views

Is there any reason to prefer one MLCC manufacturer over another?

I'm specifying some SMD chip capacitors for the first time and I note there are several manufacturers out there: muRata, Yageo, Vishay, AVX, Kemet in particular, perhaps others. Is there any good ...
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1answer
473 views

Why put vias underneath an IC?

Several designs I've seen have a load of vias underneath high frequency or analog ICs. For instance, this is a part of a PCB design for a DDS unit: Design from http://rudius.net/oz2m/ngnb/dds.htm ...
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113 views

Question after my first attempt with reflow soldering

I have a couple of questions, plus I'd invite any comments/feedback/suggestions to improve my results. I used solder paste Chipquik SMD291AX10 (Sn 63 / Pb 37) on the pads and also flux (Chipquik ...
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116 views

Simple parallel SMD LED circuit(need help)

I'm going to make some LED circuits, but I'm not sure if it will work. The problem is that I want to use Red and Blue leds, but they have different drop voltage. Will this circuit work?
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1answer
91 views

Do all/most SOIC chips whitstand the 235 degrees C for reflow soldering?

I want to try reflow soldering for several projects (small scale). For some of the components (e.g., resistors and ceramic capacitors), the datasheet does give specific information about maximum ...
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3answers
142 views

Best Way to Solder/Desolder Surface Mount Components

I recently got my hands on some old motherboards/PCB's, and even though I know reusing parts from old PCB's is not as good as using new parts, I was wondering what the best way is to solder/Desolder ...
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394 views

What is a good methodology to identify small SMD components?

Having been in the position of trying to identify a strip of mystery 0603 components I found on my floor, I thought a good general question to pose to this community might be what a recommended set of ...