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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25 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
58 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 ... ...
30
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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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0answers
63 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 ...
6
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1answer
163 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 ...
5
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5answers
98 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
63 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
32 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
168 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
75 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
97 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
252 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
100 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
90 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
35 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 ...
2
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1answer
71 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
49 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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0answers
81 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 ...
6
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2answers
132 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
222 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 ...
5
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1answer
48 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
55 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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1answer
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 ...
3
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2answers
166 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
90 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
117 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
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
5
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3answers
256 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 ...
3
votes
1answer
80 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
74 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 ...
3
votes
1answer
100 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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2answers
160 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 ...
6
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2answers
165 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 ...
5
votes
1answer
470 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 ...
2
votes
3answers
111 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 ...
0
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1answer
100 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?
3
votes
1answer
90 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 ...
1
vote
3answers
137 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 ...
9
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1answer
322 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 ...
3
votes
1answer
55 views

Missing pad tCream

I've just finished my first component footprint and then I figured out that there is a pad without tCream, which I guess it is generated automatically. What could be went wrong? By the way, does it ...
1
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1answer
72 views

Help Identifying this chip (ATH342)

Fairly simple, I have a small 8pin chip on a board, and I have no idea what its doing, and cant find any information about it online. There are no manufacturer logos on it, and the serial number ...
0
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1answer
167 views

How to mount an OLGA package IC for development

I need to mount an IC with an OLGA package in a protoboard or wirewrapping board for development. There is no development kit in the manufacturer's website for this IC, so all I have is two samples of ...
0
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2answers
57 views

Peak Voltage Ratings of SMD Inductors

Off the shelf SMD Ferrite coils are widely available and popular .The power ratings are adequate for many applications.The manufacturers are clear about the current ratings for saturation and copper ...
4
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1answer
229 views

Cooling for D2PAK dissipating 30W?

I'm designing a board with some MOSFETs that dissipate a fair amount of power. The best device (low Rds and low Qg) available in this scenario would run at 30W max. This is available in D2PAK and ...
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2answers
111 views

Removing SMD connector from PCB

I have a old PCB board and there are some connectors on it that I would like to use again. Is there any possible method to remove the connector with plastic parts (say molex 53398-0271) without ...
2
votes
2answers
74 views

Should I design a high-power switched mode power supply with surface mount components?

I'm designing a SMPS for a fairly high-power application (2kW, 50A). In looking at the available components, sometimes almost the exact same components are available in surface-mount and through hole ...
0
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3answers
106 views

Is there such a thing as a multimeter with needle prongs as small as an exacto knife tip? [closed]

im working with repairing cell phones and I need to test connectivity, but the multi-meters that i have too big of a tip. are there micro tip multi-meters for precision use on tiny chips as small as ...