Questions tagged [surface-mount]
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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Alternatives for 0402 0.1 uF capacitors in custom RP2040 PCB
I've been designing my own custom RP2040 board, but with only a minimal number of components to do a UART and I2C peripheral, and no USB. However, the design guide https://datasheets.raspberrypi.com/...
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What do these capacitor markings mean?
I think the two cans in the two photos below are aluminum electrolytic capacitors (the top photo is much more zoomed in, but the capacitors are about the same physical size),
probably from the same ...
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Why do these SMD switches have keepout zones?
This type of switches comes with keepout zones. This is the default footprint used in Kicad (specifically it's Button_Switch_SMD:SW_SPST_SKQG_WithStem).
Why are there keepout zones for this switch?
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Connect a U.FL connector to a printed PCB antenna
I want to connect a U.FL connector to a PCB antenna on the ATWINC15x0-MR210PB, which is a meandered inverted F Antenna (IFA). I am not sure where to begin termination. C21 is where the antenna signal ...
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Can I place vias under components if they're not on the pads?
There are several posts on this site (and elsewhere) discussing why, in general, vias on pads need to be avoided.
Understood. Can I place vias under components if they're not under the pad?
If so: Is ...
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Which manufacturer makes these crystal units?
I'd like to identify the manufacturer of these crystal units. Apparently the first line contains the frequency information (8 MHz, 16 MHz...).
The second line starts with a small 'e' which is probably ...
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SMD Potentiometers, with long and standing wiper
I am trying to find a component, but I am not sure if such a component exists.
I want the potentiometer with the standing wiper, like this:
However, all the potentiometers that I find of this type (...
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Identifying SMD component on Philips TV 65OLED804/12 remote control
I need to know what kind of SMD this is. The text on it says: VUAI, and the device is the Philips remote control YKF463-001.
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Need help identifying smd capacitor value
I have a samson auro x12D powered speaker and I cannot find a schematic or service manual anywhere on the internet for this board.
I identified 2 open capacitors (c10 c11) on the power board but I ...
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Please identify this burnt SMD component in this LED driver PCB
This is an LED driver labeled as ED-SC 50W1200 (on the plastic housing) and no data is written on the back side of the PCB.
The other side of the PCB is immersed in a black resin that is now locked as ...
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Desolder solder via deep fryer?
I was reading this post and came up with a wonderful, horrible idea. Can electronics survive in cooking oil?
Has anybody heard of using hot oil as a medium to transfer for the purpose of soldering/...
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Footprint for 12.3x12.3mm SMD inductor
I want to incorporate this inductor:
https://www.lcsc.com/product-detail/Inductors-SMD_SHOU-HAN-CYH127-150UH_C2929506.html
in my project.
Datasheet it here: https://datasheet.lcsc.com/lcsc/...
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NPTH through SMD pad
I'm trying to incorporate this design for an 18650 battery clip into my PCB. I'm using KiCad.
If you look at the datasheet, you'll notice that there's actually two tabs sticking down from both ends of ...
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Identify SMD DC-DC converter chip
I am trying to identify the DC-DC converter chip in the images below (two variants of the same PCB). Input (B1) is in the range of 20-60V and output is 12V. I have found devices from Torex Semicon ...
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What is the SMD component (MRY marking)?
I could not find the part number for this component (right arrows).
The component on the left is a Schottky diode, right?
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Help me identify a chip marked `145AZ01 A2E1A53 C`
This is part of a 4 channel WiFi switch - most probably a resistive or capacitive touch controller. However, I am unable to find any reference online using marking from the chip (145AZ01 A2E1A53 C). ...
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Can anybody help me identify this SMD component?
I'm trying to identify this SMD component. If I'm not mistaken, what's written there is "23F"
Device: Laptop
Model: Toshiba Satellite C850-P5010
SMD Location: Near display connector
Problem: ...
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Looking for an SMD fuse spare part marked with "PP"
I am bit out of ideas for this SMD fuse marked with "PP", where I can only find "P" ones. It's about 2x1mm in size. Does anyone have a clue what that is? Maybe its no fuse, after ...
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Can a small glass cylinder with "6.00" marking be a fuse?
My guess is that this part soldered to an SMD board is about 20 years old (it's from the controller of a Mecablitz 50MZ-5 wand flash). The controller currently is not working but that may be due to ...
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Identifying an SMD diode
I have a small PCB from an automotive button.
I would like some help to identify the diode. I am not finding a lot if I search for 1429. My multimeter in diode mode gives 740 mV (diode in situ).
Since ...
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What is the difference between 1206 and 0612 (reversed) SMD resistors?
I wanted to know what is the difference and if a 1206 resistor can be chosen as second source of a 0612 if the other specifications are the same
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Found a bizarre looking capacitor
I found these capacitors from a broken test equipment in my lab. I guess these are capacitors since the component label starts with 'c'. But I'm not 100% sure what they are exactly. I've also noticed ...
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Final design considerations for LM5143A-Q1 buck converter. Are these features needed?
After a few days of learning how to make a buck converter using the LM5143A-Q1 TI IC, it's finally becoming a reality! This is the final design, highly inspired from page 30 in the datasheet, some ...
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Identifying an SMD component
It is related to the USB bus voltage in a Delta HMI that has been damaged. Is this a 2.4 V Zener diode? This component is marked with the letter D311 on the PCB.
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How to choose the right inductor current limit for buck converter?
While learning and trying to make my first two-phase buck converter to power some servos, I found 2 x 3.3 uH inductors are needed for an application that will draw 30A (15A each). The problem is that ...
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What SMD components from an LCD control board are these?
The reference designator of the first unknown component I'm asking for is "AC1". And then I can't find anything similar to the 10 µH pictured below too. It's around 1.2mm tall and has a ...
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How to choose the right inductor for buck converter with LM5143A-Q1? (from TI)
While working on my first voltage regulator circuit I got stuck at calculating the inductor value... The IC is LM5143A-Q1 from Texas Instruments, and according to the datasheet, the formulas for ...
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How to put the LM5143A-Q1 IC in voltage adjustment mode? (From Datasheet)
I'm trying to make my first voltage regulator circuit using the LM5143A-Q1
Buck IC. The datasheet does include examples and all the values required to get the 3.3/5V fixed output, but it barely has ...
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Why are SMD components not good for high power applications?
I have been using this capacitive power supply to drive a circuit (an OP amp and relay), but what I can't understand is that when I tried using an SMD resistor (R2) after some testing (turning on and ...
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Best way to hold a slightly twisted, castellated-hole PCB board to another during reflow/hand solder?
I have a 31x61mm PCB with castellated holes that are slightly twisted - enough to prevent it from having great contact to the other PCB during baking.
What I currently do is place the PCB by hand and ...
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How can you tell if a resistor is SMD or THT?
In my small project, every type of component I am using (inductors, capacitors, ICs) has something to indicate that is a surface mount type except for the resistors. I need to know so I can select the ...
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IC identification - Analog Devices IC with top marking S 0Z - 10 pin SMD IC
I need help identifying this 10 pin SMD IC with just "S 0Z" as top marking.
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Need help to identify SOT23-5 component
I'm in need for some help to identify 2 components marked with:
S3TJ
S2TI
There are found in PC Controller from 8bitdo and it contains 3.7v battery and charges using USB.
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Need help identifying SOT-23 component with marking S5NCA
I'm working on an active subwoofer made by Jamo. Subwoofer works normally but while in auto sleep mode it blows a fuse. I measured components off the PCB and only suspicious thing I found was this ...
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Reflow soldering with decreased footprint size fully within pad
So the original footprint is first, followed is the edited footprint to allow for inner pads to be accessed.
As you will notice the extended pad footprint is smaller than the pad. Will this cause ...
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OverAir 2.4G/5.8G SMD Antenna OA-W01
has anyone ever used this type of antenna? the brand and type that I'm looking are OverAir SMD Antenna OA-W01, but there is no datasheet and clear way of placement on
PCB. I have attached some ...
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Could 94-HB board be used for SMD and THT soldering?
I have a circuit that I designed lately which is quite simple based on just 1 opamp and have an SMD and THT components (like a relay) and will be producing mass production in Chinese factories and it ...
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SMD button not in jlcpcb BOM
I want to try the jlcpcb assembly service.
I created the BOM, by using the bom2grouped_csv_jlcpcb. I inspected the generated file and indeed all the SMD components ...
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Aluminium PCB - Bottom Entry Connector
Is there something like this connector that is easier to buy? I need to find something that lets me connect an aluminium PCB to an FR4 PCB with part of the enclosure between them. The part of this ...
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How is this USB connector supposed to be soldered
I'm using this USB-C connector in a project but could not figure out how it should be soldered to the PCB. I could not figure it out from the datasheet either. It says it is an SMT component - does ...
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Help me identify this capacitor to fix my monitor
My monitor ( Samsung C32HG70 ) is having a common issue about 2 years in with horizontal/vertical line issues.
I've narrowed it down to this capacitor that I can tap on a bit and the back to normal ...
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SMD Package type selection based on component role
Apologies if this is an obvious question, but as a novice, I wanted to ask - is there a rule of thumb when it comes to selecting a surface mount package type (https://en.wikipedia.org/wiki/...
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Need help identifying DFN-8 Part
I've got an 8 pin DFN-8 package I can't seem to identify. Things I know:
Its a DFN-8 2mmx2mm
Its got a large pad underneath
Pins 2 and 5 are connected to the GND on the micro-usb connector on the ...
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Please help identify this SMPS IC
I need to repair a charger for an e-bike. The model is SHC-8100L made by stchargers.com.
The unknown IC (marked U1 here, a 3x2 mm SMD IC marked 71427) seems to be faulty.
Input voltage seems to be on ...
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Identification of two 3+1 pin SMD components - DC P39 and BD P44
I have these two SMD components, one with the nomenclature DC P39 and the other BD P44. I would like you to help me identify each of them, what they are, what they are used for, and provide the ...
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Kicad - 0805 Hand soldered package
When I try to select a footprint for an 0805 resistor in Kicad, there are two options.
What is the difference between them and which one do I choose?
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Switching Voltage Regulator not Outputting Correct Voltage
I am working with a LM2576T-ADJ that is taking as an input voltage a 2 cell Li-Po battery that in my application won't decrease below 8V and should output a voltage of approximately 6V to power a pair ...
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