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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30 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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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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95 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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155 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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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
93 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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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
47 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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114 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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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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224 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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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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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
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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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44 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
242 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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593 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 ...
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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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83 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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2answers
70 views

Desoldering SMT components with a reflow oven

I'm wondering if it's possible to desolder all smd components on a PCB using a reflow oven? My plan is to hang the PCB upside down over a piece of aluminum foil, use a standard reflow profile and let ...
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What's the third footprint pad on some SMD LEDs for?

This has been asked, or brushed by before, but not really answered, for instance, here: SMD LED footprint I still don't know what the 3rd footprint pad for some SMD LEDs (like the Vishay VSMG10850; ...
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3answers
554 views

SMD desoldering - struggling to get this chip quik stuff working, what am I doing wrong?

So I have to replace a SMD connector, and although i do have soldering experience, it's all with THT. I watched like 10 different YouTube videos on chip quik, and they all made it look so easy, so i ...
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1answer
138 views

Connect rectangle pad to jumpers

I'd like to know some general approaches to creating DIY connectors for a custom PCB or card. Mainly I'd like to know how to connect some flat SMD pads to standard jumpers that would connect to a ...
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64 views

SMD oscillator and decoupling caps placement/routing

I want to design a four-layer board with a PIC32MM0256GPM048T microcontroller. All components must be on the top of the board. I tried routing OSC1 (osc in) and OSC2 (osc out) lines, and placing the ...
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3answers
512 views

Is it possible to solder this non-standard package (sim900) using hot-air station?

I don't have any experience with hot-air soldering. Would it be possible for a complete newbie to solder this kind of package using a hot-air station: (source: soselectronic.pl) I only need to solder ...
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101 views

Identify SOT-23-6 component marked “FGSU” or “FG0U” (perhaps RF switch or amplifier)

I have a real problem in finding the component that has SMD marking "FGSU" or "FG0U". By "or" I mean I see them both in the same circuit design in the same place. It's a component that is used in MRI ...
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5answers
109k views

Safe temperature for desoldering SMD components w/ hot-air rework gun?

What is a reasonably safe temperature to use for desoldering SMD components using a hot-air rework gun? I have a new-to-me rework station from Xytronic and the documentation clearly assumes you know ...
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61 views

Identify 6-pin SMD device with top marking A6DB 276

Please help me to identify the circled 6-pin SMD device with top marking A6DB 276 and its manufacturer.
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1answer
75 views

Strange markings on SMT resistors

The other day, a network card was acting up (even thought the software didn't report any functional problems, the network didn't connect in duplex). On checking the board visually, I found these ...
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1answer
75 views

Solder jumper wire to the pin of a mounted chip

I have a USB serial device from Sparkfun. https://www.sparkfun.com/products/15096 Unfortunately, I need access to the RTS pin (to, connect to an ESP8266) but this module does not pin it out. I have ...
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2answers
564 views

Usefull 0402 and 0603 solderbridge footprints compatible with machine manufacturing?

I am currently in process of my eagle library cleanup, and came up with the idea to create a footprint similar to the one from nucleo boards. Those pads are meant to be easily bridged by just solder ...
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Why do some SMD electrolytic capacitors have platforms?

I’m working on a computer monitor’s power board (to replace a capacitor or two, which I assume is the problem), and found these: Replacements are easy to find, so no issues there, but I’m curious why ...
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How can I find a replacement LED to repair RJ45 tester? (re: SMD size, measured with multi-meter)

I'm trying to fix an RJ45 (CAT5/6 lan cable) tester and I need to replace some LEDs and diodes (SMD and not through-hole). The tester has 8 LEDs (one for each wire) and only a few are blown so I ...
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77 views

Identify some SMD components

I need to identify some SMD component. COMPONENT 1: Markings are T5 and G7. Seems package is DFN 6. COMPONENT 2: Markings are J90 (underscored) Package is a 6 pin SOT This one I suspect is some ...
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2answers
157 views

How do I solder a ~20-pin USBc connector near heat-sensitive components?

I currently have an LG V20 and its charging port is deteriorating. Unfortunately, it is out of warranty and the best price that I can find to have it professionally repaired is US$60, which is about ...
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56 views

5-pin SMD device identification - top marking CaC9A

Please help me to find the name of this SMD device with top marking CaC9A
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4answers
135 views

Supporting SMT electrolytic capacitors in high vibration environments

I recently experienced a situation where an engine ECU failed. The post-failure analysis showed that two capacitors had broken loose from the board due to stress from vibration. I have replaced the ...
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2answers
519 views

Is there any connector for SMD components

I want to fine-tune the resonance of multiple LC-circuits with hand made inductors(coils), and SMD capacitors (NP0 type). Currently, I am tuning the resonance frequency by soldering and desoldering ...
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2answers
921 views

Help identify missing component USB power

Can anyone help identify the component that is missing from this circuit board? The board is the main controller board for a music keyboard. The keyboard is meant to be able to be powered over USB but ...
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1answer
654 views

Can Computer Motherboards Work Fine Even With A Damaged SMD Capacitor/Resistor?

I'm asking this because when I was replacing my laptop battery, I accidentally hit and broke/disconected one SMD capacitor off the board, then I turned my laptop on, it made some weird electrical ...
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Electronic component identification and sourcing

I'm trying to repair a electronic component but don't know what it is called and where I'd get a couple of them. The 2 to the right have the number on them. 425 BGT is what it looks to be. Any help ...
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1answer
81 views

Identifying a two numbers SMD capacitor

On this board, I'm trying to identify the burned component, which I believe might be a capacitor. When zooming in, I think I recognize "47" written on the first line, and maybe "16V" on the line below....
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1answer
122 views

How to determine the model/type of SMD Capacitor and EMI Suppression Filters on a laptop PCB?

I am a newbie to PCB electronic components and I have the following questions on SMD on a laptop PCB. The picture below shows the SMDs around a m.2 connector for SATA SSDs. 1) The SMD in the red ...
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48 views

Diffrence between cr0603 and r0603

I am shopping for parts on mouser and was wondering if someone knew the difference between cr0603 and r0603 concerning smd resistors. You see this one has code CR0603 https://www.mouser.ca/...
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68 views

can you please help me to identify this smd component marked M 412 727a?

Hi please help me identify this smd component marked M 412 727a thanx
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1answer
244 views

Identification of a very strange SMD component

Could anyone help me identify what component this is? It is the white component with a black stripe. What ever it is, it appears to be a open circuit. I couldn't measure any resistance (or ...
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1answer
175 views

How to name SMD packages in my Pick&Place library

I have massive problem with finding a correct scheme to name the packages correctly in my Pick&Place machine's library. For example: QFN-16 I have one QFN-16 with 6+6+2+2 leads and another QFN-16 ...
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1answer
320 views

Identifying a cylindrical SMD component with two banded color markings [closed]

I have been looking at google images of cylindrical smd resistors, but they don't look like the ones on my board. So my question is: What component is this? Long story: This board is a 230VAC to 11....
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1answer
83 views

Beginner questions on some SMD components in phone motherboard

I'm trying to understand smartphone motherboard components and have a few questions that might be easy for some of you to answer. Please refer to the attached image for the question numbers: Are ...

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