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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29 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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55 views

Identifying an unmarked SMD capacitor on the backside of AMD EPYC CPU [closed]

Could everyone please help with identifying an unmarked SMD capacitor on the backside of AMD EPYC CPU. The thing is that one appears to be broken (it happened during handling or transportation) and ...
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1answer
61 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
65 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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29 views

Help identify gold plated SMD components,

photo shows 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 this ...
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59 views

Smd resistor code= IEE

r28=iee what is meaning of iee code of smd resistor?
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1answer
71 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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1answer
54 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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132 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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30 views

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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580 views

Can anyone please identify this 6 pin SMD integrated circuit?

Can anyone please identify this 6 pin SMD integrated circuit or what it does? I could not find it by the code written on it. It is from a solar charger and I need to replace it.
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51 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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724 views

What is this SMD for on a SZBK07?

I purchased a SZBK07 CCCV Step Down Buck Converter and I was hoping to remove the TRIMPOT and replace with a potentiometer how ever there was a Orange SMD thing bridged between the 2 and 1 pin's on ...
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135 views

Need help on troubleshooting PCB circuit

I recently got a freelancer to design a push-button latching circuit that powers a 12VDC motor from a 1S1P Li-Po cell. I have soldered all the components but the board does not seem to work properly. ...
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1answer
22 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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38 views

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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1answer
61 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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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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2answers
80 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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70 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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15k views

The “right” 0805 footprint land pattern

My PCB design software comes with some libraries that include some common components, like chip resistors and capacitors. I have noticed, however, that the footprint land pattern for the 0805 ...
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0answers
24 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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2answers
48 views

Voltage drop from PCB ground plane to motor driver

I'm new to creating circuits but have designed a PCB and made it with Eagle, however, the BD6210F that I'm using doesn't want to allow me to run the motor due to the voltage only being input at 2.5v. ...
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1answer
70 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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3answers
71 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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3answers
1k 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 of ...
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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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2answers
2k views

How do you know which way round a 6-pin SOT23 goes?

Well, I have a 6-pin SOT23 and it is absolutely tiny. When I say tiny I mean it. Anyway, it is unclear which way it goes around as it has no indicator, so I don't know how I can install them on my ...
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2answers
1k views

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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1answer
65 views

What are these SMD components with 3 leads?

Full resolution link is here I am trying to repair a vacuum fluorescent display module by Futaba model code is M402SD07GS. It is seen that there is no energy on the display and Vcc and GND legs are ...
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19 views

Asus Pg278q mainboard component

Hi I'm looking to repair the mainboard of my gaming monitor but I'm having a hard time finding the name of the burnt out components. I can't even find the schematic. Please help Asus pg278q monitor.
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3answers
60 views

Why have a bottom mounted pad on a component and not use it?

For my design, I am using the ICM-20689. The pinout for the chip is taken from the datasheet: Once I get to the bottom of the datasheet, I notice that there is a bottom-mounted pad that is not ...
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2answers
89 views

NPN SMT Transistor with flipped Emitter and Collector

Good day! I have designed a little circuit and got some (5) PCBs printed and assembled in china and unfortunately I made a mistake when I transferred my prototype circuit into my schematic. Even less ...
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147 views

Eagle - outlines/placeholder for smd (0603)

I'm a bit new in this area, trying to make a PCB for my little project and cannot find how to make placeholders for smd components in Eagle 9.2.2. Is it possible to have/create outlines for smd (...
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1answer
41 views

Removing single 1212 (3030) LED

Is there any way to remove and replace a single 1212 (3030) LED from a heat-sink board as shown in the images?
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1answer
67 views

Help identify SMD diode without markings [closed]

It is a diode but no marking at all, except the cathode band. Please help.
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1answer
33 views

Identify sot-23 smd component and possible replacement

I need help identifying this rusty smd component (sot-23 3 pins). It comes from an early 90's sony discman. Thank you!
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28 views

Identify smd capacitors

These smd capacitors have come off an old discman board. I've been looking into the main manufacturers (at mouser.com), but didn't find the exact labeling. They look like a 3.3uf 50v and 4.7uf 35v. ...
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1answer
45 views

Identify this SMD TVS

What is this exactly? It measures 0.14" (3.55mm) wide x 0.22" (5.56mm) tall x 0.09" (2.26mm) thick, likely a DO-214AA or SMB package. Circa 2016. Removed and photographed. Out-of-circuit it measured ...
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1answer
111 views

Compatibility between XBEE-PRO 900 HP and XBEE SX

I wanted to use a 900 MHz xbee and I need one side to be surface mount. So I'm thinking of getting an XBEE PRO 900 HP (XBP9B-DMST-002) and an XBEE SX (XB9X-DMUS-001). These devices have the same ...
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5answers
1k views

Do SMD mount bases exist?

I'll soon need to test and work with SMD components, but these components are very small, about 2.5 mm x 2.5 mm (DFN package for example). I had a simple question that I can't answer despite my ...
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4answers
223 views

How to connect multiple 0402 leds to an Arduino for a 1:87 model

I want to replicate lighting a 1:87 scale police car with the aid of an Arduino Pro Micro ATmega32U4 powered by a 90mAh 3.7V LiPo which is connected to a TP4056 5V Lipo battery charger which is ...
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1answer
3k views

Is there a good replacement for stripboard in the surface mount world?

More and more components I want to use are only available in surface mount packages. I can either get a big collection of adapter boards for all flavors of SOIC/WFBGA/QDERP to 100 mil pin spacing, ...
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2answers
111 views

Identifying burned SMD component

I have this Philips One Blade trimmer (disassembly video) and I have probably by mistake tried to charge it with charger from the older Phillips shaver which had almost identical connector but 15V ...
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1answer
24 views

How do I pick a suitable SMD mosfet to control a 24V pneumatic valve with PIC32?

I need to control a valve (https://datasheet.octopart.com/VXZ242FGA-SMC-datasheet-110849414.pdf) of which I do not know its power consumption and drawn current. I don't have the part yet and usually ...
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1answer
42 views

Identify SMD tactile switch

Do SMD markings not apply to switches? Here is a Matsushita switch on a keypad matrix from circa 2008: The top is stamped with "8", "9", "R", and ":". It has the following measurements: 6.31mm ...
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1answer
238 views

Re-soldering SMD with SMD rework station

I recently purchased a clone 858D SMD rework station and would like to get familiar with de-soldering and re-soldering SMD chips. I was able to de-solder fine, but when trying to re-solder I can't ...
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2answers
573 views

Identifying this smd component [closed]

A beginner in electronics, I have gone into an attempt in fixing an LCD screen (Lacie 324i) that wasn't switching on. I have found that it was due to a small capacitor that was dead at the level of ...
11
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3answers
3k views

Should SMD footprints be rounded?

I was looking at the footprints in Altium's Atmel library, and I noticed that many (most?) of the pads had rounded rectangles. However, if you use Altium's own "IPC compliant footprint generator", by ...
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2answers
72 views

22uF 0805 SMD capacitor for voltage regulator?

I'm trying to use some part of this circuit dual power supply circuit: http://embedded-lab.com/blog/multi-purpose-dual-power-supply-5-0v-and-3-3v-regulator-board/ Credits to embedded-lab.com. I ...

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