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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SMD component identification - possibly BJT

I found a defective SOT-23 on a broken PCB, but can't identify it. Probably a BJT, but what kind? The one on the right seems to be the same as the blown one. I would appreciate your help.
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SOP-4 Package Footprint Standard

I've got a TCMT1102 Vishay optocoupler. Its a 4-pin SMD part but there is no standard package type associated on the datasheet - i.e SOP, SSOP, TSSOP etc. Vishay has a footprint document that ...
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52 views

Thick film resistors failure mode

I'm experiencing failures on thick film resistors. In a metering device which samples the mains voltage through a voltage divider formed by a series of 150K 1% 1206 SMD resistors, many of the ...
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85 views

Can anyone identify what this smd component is?

It’s on a Pentax camera lens. I know it’s made by Murata. Believe there are six terminals.
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481 views

How should I design a heat sink for an SMD power mosfet?

I really like the specs for the Infineon OptiMOSPower-Transistor IPT007N06N, but how would I keep this beast cool? Usually I use regular aluminium heat sinks (with water cooling or a fan) for MOSFETs ...
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19 views

Fine-pitch SMD pads on flex PCB using coverlay rather than soldermask

SMD: "Solder-Mask-Defined" NSMD: "Non-Solder-Mask-Defined I am making a thin flex-PCB (0.2-0.3 mm) on which I am going to mount a component which has SMD pads. I would like to also make ...
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48 views

Component ID: SMD resistor(?)

tl;dr: how to procure a SMD replacement if all i know is the 3R3 marking and sizes (square 6.5mm sides, 2.9mm tall), with no extra information on thermal, etc. One component on my motherboard fried to ...
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52 views

What kind of diode is this? Marked “1934 MZ”

My drone's power distribution board heated up. There is a diode in the picture - I could not identify it. Can anyone help?
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57 views

How to identify SMD components?

I am trying to understand SMD components. Came accross ICs and seems like quite hard to hunderstand. Is there any general rule? Could someone help me to identify the ICs in the pics. One is marked as &...
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26 views

2 terminal SMD resistor marking code with Omega+F

What kind of code are the markings on the resistors in the picture? I think they write out the Omega symbol, just because there is enough space on the component and looks nice, but I was not able to ...
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65 views

Help identify this SMD oscillator

This oscillator provides clock to an FPGA which powers the ultrahdmi mod for an N64 (https://www.retrorgb.com/ultrahdmi.html). It's clearly marked A03ZZ 1414 Clock output is diametrically opposite pin ...
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An other smd identification help

Searched a lot and didnt managed to find this smd . Any suggestion , replacement smd ? Thanks in advance. (SMD code as pic shows PH69 A 918010 ) Here is an other pic
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Are there any differences between SMD and THT inductors?

I wonder if there exist any differences in performance between chip-SMD (like 0805) inductors and THT inductors? More specifically I need to solder 10 uH 0805 SMD inductor for my bias tee module (like ...
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55 views

Trying to identify SMD component from a Ps2 Slimline

(English isn't my first language) I'm trying to fix an old Playstation 2 Slim my cousin had that was turning off by itself after 5 minutes playing. After some search on the internet, I found that it ...
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Calculate the Thermal Resistance (Junction to ambient) from Thermal Resistance (Junction to mounting base)

I have this MOSFET - MOSFET Datasheet I want to calculate the maximum junction temperature of the MOSFET part. I have calculated the power dissipation. In the MOSFET datasheet, there is only Thermal ...
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Why are thin-film surface-mount resistors particularly suitable for use in cryogenic environments/conditions?

I am currently studying The Art of Electronics, third edition, by Horowitz and Hill. Appendix C.4 Resistor types says the following: The usual choices for general-purpose use are metal-film (axial-...
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75 views

Identify SMD transistor - top marking BC RJ

I need to know the specifications of the transistor Q5 with top marking BC RJ
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102 views

Why is this resistor only connected on one side?

I have taken a photo against the light so you can see through the board. It seems the circled resistor is only connected on one side. My hypothesis is that there is more than one version of this ...
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Is there another part number for z1w47 SMT zener diode?

So I need to replace a SMT component that burnt on a board. The part number that I was able to get from the component is Z1W47. A quick google search lead me to CZ1W47. However, I can't find anyone ...
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34 views

Unknown SOT23 IC without matching code?

I'm trying to pick apart a signal conditioning board. I found a SOT23-6 package marked "4DLB" which doesn't seem to have any matching SMD code in any charts I found. I suspect it may be a ...
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64 views

Can't identify SMD component

I need to identify this SMD component, which looks like a tantalum SMD capacitor. But I can't find specs that would match the marking on a component. I hope that someone can help me.
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38 views

SM 03 Diode Identification

I'm trying to replace a bad diode in my Chevrolet Captiva C100 rear wiper motor circuit board. The marking on the SMD diode says SM 03 and I could not cross reference the marking with the correct type ...
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32 views

Replacing a hard to get BGA part with a small circuit board?

We have a production design PCB with suddenly hard to source BGA part. It could be replaced with a much easier to source device, but we'd prefer not to go back to layout and redo/reverify the board ...
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38 views

Help identifying this SMD component (IR sensor) [closed]

I have a mini differential IR sensor PCB that serves as the bed probe for my 3d printer. Looking at the SMD components, there are a few items I can not find or identify. Does anyone know the part ...
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96 views

SMD chip identification - top marking “LA” then sideways “4”

Does anybody know this chip? It gets input from a photo-resistor and triggers a solar light circuit.
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79 views

2004 Chevrolet Avalanche surface mount component identification

My instrument cluster stopped working and when I plug it in, I smell some burning. I found this component smoking and seems to be the source of the trouble. Can anyone please help me identify what it ...
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72 views

Looking for some help with SMD Component identification N51K

I've got a faulty GTX 1070 Graphics card here with a blown SOT-23 casing IC. Looking at it you can se N51 and looking around on the board I can find another component like it with N51K. I cannot ...
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39 views

Identify this SMT device

Can anyone tell me what are these smt devices. Especially the one with square drawn at centre
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37 views

Soldering QFP with thermal pad (but with obstructions/no vias on underside)

I will start by saying that I'm a complete newbie when it comes to soldering SMD. I've been practicing with scrap boards, and I'm getting there, but not sure how to approach this one. I am trying to ...
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1answer
69 views

Using holes instead of vias for unused through-hole pins

I'm creating a footprint, in Eagle, for a USB-C connector. The part has 16 SMD pads and 16 duplicate through-hole pins. The pins are very close to each other and the specs in the datasheet have ...
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1answer
77 views

Please help me in identifying surface mount component

So I've accidentally knocked down a computer system used to take kitchen measurements. I've caused a short in the power supply which caused two SMD components to burn in the motherboard. I've ...
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87 views

What are these long gold plated SMD components on the NVidia Tesla A100?

This photo shows a NVIDIA Tesla A100 board. Please note the 4 SMD components on each side of the chip. Looks like gold plated ceramics. I have never seen components like this. Can someone identify ...
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76 views

Smd resistor code= IEE

r28=iee what is meaning of iee code of smd resistor?
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141 views

What is the correct pin spacing for this footprint?

I'm trying to import an IC footprint into CAD software and can't seem to nail down the exact dimension for pin spacing. The two supporting documents seem to conflict with each other (Land Patterns ...
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1answer
77 views

Identify component (diode?) based on photo

I am currently fixing a Akai MPK Mini mk2 midi controller with a loose USB port. In addition to the USB, it is missing one part labeled as D1. It can be seen in the attached picture circled in red. I ...
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Have a surface mount device 6G80 package SOT23-6 not able to find datasheet/ or even basic information

I have a cheap power supply that I am trying to modify. The 6G80 appears to be a regulator (driver) chip that drives an N-MOSFET. I do not have an oscilloscope with me, so I am unable to tell if it is ...
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62 views

How to solder qlpf48 (or how to fix it)?

I think I'm really not so good at soldering. All places say it's it's fairly easy to hand solder LQFP ICs, but for me it isn't... On videos the tin nicely melts between the pins, and do not create ...
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64 views

SMD diode identification

I cannot seem to find any information for this diode, or for the package. It is slightly bigger than a mini-MELF and has a repeating number 3 as cathode band. It meters like a normal silicon diode. ...
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25 views

Component identification: general semi LP 3C

I have this component salvaged. I think it's very generic, but I cannot find it. Properties: Dimensions: SMT 1206 length size, although the width is wider Logo: General Semi (now Vishay I think) ...
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Solder QFN88 by Hand

I just received my newest board i've designed and wanted to solder the first prototype. One of my Chips has a QFN88 Footprint. I'm quite experienced, but i just couldn't do it. Because of the small ...
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68 views

Secure a surface mount component to a plastic surface

I need to replace a broken planar circut (a Hall effect sensor) that was attached to a plastic hull of another unit (a rotor wheel assembly). And, most probably, will need to move the entire connector ...
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84 views

Solder bridging on vias

What's the possible risk of using a board with a solder splash on vias? I couldn't clean it and it's passed ICT test. please advise.
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71 views

Trying to identify SMD with morse coded? markings

New here and first question: Any idea what this component is and it's specs? Markings look like morse code which reads "XTK" and what looks like .A. It is part of a circuit for LED, back lit, press ...
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Need to keep re-soldering SMD resistors on PCB

I made a PCB to scale a +-100V signal into a 0v to 3.3V signal that I could read using an ADC on a microcontroller(see link for idea.) I used this solder paste flux to help with the soldering. ...
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25 views

Antenna impedance matching within metallic enclosures

What im trying to achieve is kind of an chip antenna breakout board, since it must sit within a metallic groove. The plan is a PCB of 10mm diameter with an U.Fl connector on the back and an antenna ...
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3answers
79 views

Voltage drop from PCB ground plane to motor driver

Note: Feedback has been addressed and the circuit has been updated, however the same behaviour still applies I'm new to creating circuits but have designed a PCB and made it with Eagle, however, the ...
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1answer
72 views

Is there a full list of the names & abbreviation of electronic components [closed]

I came by a few electronic components that I don't recognize them from their shape nor their letters printed on the PCB. Is there a full list of the names and abbreviation of electronic components? ...
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209 views

How to check SMD capacitor for being shorted, without disconnecting it from the electric board

This YouTube video shows that you can check SMD capacitors for being shorted using buzzer mode, by touching the ground of the electric board with the negative terminal while touching each side of the ...
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Practical Issues with Surface Mount Heatsinks?

I'm considering using surface mount heat sinks for D2PAK devices on a PCB. These heat sinks are bent sheet metal frames with tin/lead plating in tape/reel packaging which are suitable for soldering ...
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What is a 'piano THT' footprint for?

What is the 'piano' THT footprint for? Are these used for signal probing? See the second layout, as different from the first (KiCad ScreenGrabs).

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