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.

Filter by
Sorted by
Tagged with
5
votes
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 ...
0
votes
1answer
21 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 ...
0
votes
2answers
89 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 ...
0
votes
1answer
36 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 ...
0
votes
2answers
66 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 ...
0
votes
2answers
57 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 ...
4
votes
2answers
5k views

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; ...
1
vote
0answers
50 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 ...
2
votes
2answers
123 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 ...
0
votes
0answers
85 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 ...
0
votes
1answer
73 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 ...
0
votes
0answers
51 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.
0
votes
1answer
70 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 ...
-1
votes
0answers
32 views

SMD IC manufacturer label identification

I have an IC as shown in the image. Please help me to identify the part and manufacturer.
8
votes
2answers
7k views

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 ...
0
votes
2answers
82 views

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 ...
2
votes
2answers
116 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 ...
0
votes
0answers
72 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 ...
0
votes
0answers
43 views

5-pin SMD device identification - top marking CaC9A

Please help me to find the name of this SMD device with top marking CaC9A
0
votes
4answers
108 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 ...
4
votes
2answers
511 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 ...
5
votes
2answers
800 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 ...
3
votes
1answer
529 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 ...
1
vote
2answers
72 views

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 ...
0
votes
0answers
46 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/...
0
votes
1answer
56 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 ...
0
votes
2answers
65 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
4
votes
1answer
172 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 ...
7
votes
1answer
235 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 ...
2
votes
1answer
176 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....
0
votes
1answer
60 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 ...
0
votes
0answers
68 views

Please help me identify the SMD component

I have two nVIDIA Quadro P5000 GPUs. This component got damaged in one of the GPU while I was removing it from the PC. Please help me to identify this SMD component so that I could purchase and solder ...
0
votes
1answer
61 views

Is it easy to predict or get notified about obsolescence for DIP ICs?

The question here might seem a bit tangent for this Stack Exchange but here it goes. In the product development phase, one of the important factors under consideration is the availability of selected ...
10
votes
1answer
1k views

Which is better - components on both sides or components on one side of the PCB?

I am working on a PCB design. 50k PCBs will be produced. SMD components: 100 Through-hole components: 25 I need to minimize PCB size. There are no high-speed signals or sensitive signals in the ...
0
votes
2answers
94 views

Where can I look for USB 3.x superspeed mux chips for poor people that only have through-hole soldering tools?

I'm new to this realm of purchasing and I'm not exactly sure which of the different package names (SSOP, VQFN, etc.) are more friendly than others for basic through-hole soldering. I would also be ...
0
votes
1answer
94 views

Please identify this 6-pin SMD marked AI531

It is a 6-pin SMD from 1.6W blue laser driver The code on the case is AI531 Please help to identify this SMD. https://tr.aliexpress.com/item/33045090236.html?spm=a2g0n.shopcart-amp.item.33045090236 ...
0
votes
3answers
92 views

Are 1uF NP0/C0G capacitors different than regular 1uF capacitors?

I am reviewing an schematic and it contains several reference to 1uF 0402 SMD capacitors, some of them are marked simply as "1uF" and others as "1u, NP0/C0G" , I think both are the same, is there any ...
2
votes
1answer
77 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....
0
votes
1answer
122 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. ...
1
vote
1answer
59 views

Should I apply soldermask over SMT thermal pads?

On page 8 and 9 of the following datasheet, there's a description of thermal pads for this MOSFET: https://www.vishay.com/docs/63302/si2342ds.pdf What I am wondering is: I will design the footprint ...
0
votes
1answer
81 views

How to find replacement LED for TV backlight

My TV has a damaged LED in its backlight. The LED had started flickering like 2 weeks ago and finally the whole backlight stopped working. Nothing obviously unusual on the LED driver board, the MOSFET ...
0
votes
2answers
80 views

Antenna Impedance Matching, 0 Ohm Response

I'm currently trying to match some SMD antenna breakout boards. These boards have one type of SMD antenna, footprints for an SMD pi network and a 50 Ohm cable as connection to my VNA. Now the problem ...
0
votes
1answer
54 views

How to change the led on this board to a brighter led? 12v input

Needed to change these led to brighter led. Is it possible? If yes then how can it be done? Noobie!!
0
votes
1answer
104 views

What is this component, labelled as “RT” on the PCB?

Can someone tell me the name of the below component? It is labelled as RT on the PCB:
0
votes
2answers
77 views

If I have two aligned PCBs with pads touching each other, will they bind if I reflow them?

I have a design where two boards of the same size will be stacked like pancakes and physically touching. I want to electrically connect them, and I thought of just adding matching solder pads and ...
12
votes
2answers
1k views

How to assemble PCBs when SMT machine doesn't have enough feeders?

I just got access to an SMT machine in a DIY fablab. I have a board that has about 50 unique components that I wish to assemble and test drive this new machine. I intend to make 20 of these boards. ...
0
votes
2answers
73 views

SMD Electronics Part that could be used for hanging

I'm working on a decorative PCB and I want the ability to hang it up on a wall conveniently. I was trying to think of something that would work similar to the saw tooth looking piece in this example ...
0
votes
0answers
85 views

SMD LED without soldering

I am working in a project at the university and we need to test (electrically and optically) several different SMD LEDs. The idea is to use or create a socket able to connect the terminals of the LEDs ...
11
votes
4answers
3k views

SMD ceramic capacitor 0805 vs 1206

I don't know what size to choose. Does SMD capacitor package matter in my case, Is it wrong to choose 0805 package?
1
vote
2answers
93 views

Why would this power mosfet be made in a surface mount package?

I’m looking at the CSD17303Q5 power mosfet which boasts a 100A max drain current. It confuses me why they have it in a VSON surface mount package because most pcbs would not be able to handle that ...

1
2 3 4 5
14