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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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Help identifying an SMD component [duplicate]

I need help identifying an SMD component it is a small(1 mm X 1.5 mm) black part with an "O" written on top if it. I think it is a Schottky diode for reverse polarity protection ?. (Source, first ...
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1answer
41 views

SMD Stencil Material Choice

We are planning to purchase a stencil for our LED boards. This will be my first stencil purchase so I don't have much idea about a good or bad one. The inquiries I received typically suggest two ...
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4answers
2k views

Probably overheated black color SMD pads

Can you give me an advice what to do with probably overheated SMD soldering pads on the board? The photo is of a computer bus card, where there are 4 SMD 0603 positions labeled R1 - R4. They are used ...
3
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1answer
54 views

What is this SMD part?

I’m trying to repair a powered recliner touch sensor, and I’ve isolated the part that I think is the problem. The issue is, I don’t know what it is! In the first image, you can see that it has three ...
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1answer
46 views

Identify SOT-563 device with top code 49K

Please help me to identify this SOT-563 device with top code 49K
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0answers
27 views

SMD IC identification - AGQ6NA

I'm trying to repair a Yamaha LED headlight. The panel has SOIC-10 ICs with AGQ6NA marking and no manufacturer info. They are probably boost or buck-boost converter controllers, they drive PJD25N06A ...
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0answers
35 views

SMD Detector Microswitch Replacement

One of my son's toys stopped working and I decided to jump in to see what was causing the problem. I found that a number of the smaller detector microswitches had their tabs broken off. Therefore ...
3
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1answer
177 views

Why did KiCad merge my pins into one open blob in the solder mask gerber?

I designed a PCB with an IC that has a pitch of 0.5. The footprint solder mask looks like this: However, the gerber came out with one blob that looks like this: Why did it do that? Can I stop it? ...
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4answers
141 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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2answers
118 views

I don't know the name of the following 4-pin connector

I want to replace an SMD connector on the following PCB, but I do not know how to search for it, in order to buy it. I have attached a photo from the male connector, it might help. Can you name it?
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1answer
151 views

Identifying this smd component

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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2answers
70 views

IC has different pinouts on different packages? [closed]

I am going to use the HT16C21 LCD driver to drive my LCD. Looking at the datasheet (in the "Pin Assignment" section), I noticed that the IC comes in 4 different packages, each with varying numbers of ...
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0answers
41 views

Looking for a ribbon cable with this connector

I’m trying to identify this connector to buy or build an extension ribbon cable for it, but there are no identifying markers on either side of the connector. It is for a small camera component. Any ...
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1answer
36 views

Surface mount package size 201-1

Does anyone know what a 201-1 package size is, and how it might differ from a 'normal' 0201? I found it in a MacBook schematic. Thanks in advance for your help.
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2answers
68 views

Help to identify SMD part

Can anyone help to give any clues about identifying this part? It is from a Chinese guitar pedal and appears to be at the beginning of the input chain, so I would suspect perhaps some kind of op amp, ...
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2answers
504 views

Help identifying SMD component

I’m trying to replicate something I got a few years ago for practical use and I found every component except for this one. It says WL BD on the package and measures 2.58x1.53mm (LxW) and around 1.3mm ...
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4answers
534 views

Beyond what is recommended by fabricators, how far should traces be from SMD pads?

Having followed a fabricator's DRC (this case being OSHPark), this distance between an SMD pad and a trace is considered acceptable (see attached images). However, I wanted to inquire about what the ...
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2answers
114 views

What's the name of smd buttons build of a simple thin metal sheet which flex when pressed?

As the topic title, I tried to find them but cannot get any informations about. They are a sort of SMD tact switch made only by a very thin curved metal sheet. When you press they flex and make ...
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2answers
33 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
95 views

Calculating SMD resistor temperature rise

I am interested in knowing the actual power dissipation of an SMD resistor at a 70C ambient temperature. I am looking at a 10kOhm 2512 1Watt resitor RMCF2512JT10K0. from the electrical specifications ...
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1answer
68 views

Eagle - Custom pad shape for SMT inductor

I'm trying to make the following footprint in Eagle for an SMT inductor: I understood how to make D-shape pads and similar, but this is driving me nuts: my idea was to enclose a pad into a polygon ...
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0answers
50 views

What is the type of this fuse?

this is 160mA SMD fuse, what is the type of this fuse?
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1answer
1k views

Identify unknown SMD component code A6530 72130

I have a TTL to RS485 driver board and I am try identify one of the manufacturer part number from the board. Can anyone identify the SMD Code and manufacturer part number of the following device? ...
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1answer
150 views

SMD identification SOT23 “t” “7” symbol

I tried to identify the component marked with "t 30" the SOT23 package. I looked for the "t" of "7" symbol in this list and also tried smd marking search engine but couldn't find it.
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2answers
196 views

Troubleshooting defective LED bulbs

I bought 10 Thomas Watt LED bulbs and 8 are dead in less than a year (each last about 2-3 months). Soometimes a couple of days before they stop working, they flicker when I switch them on or after ...
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4answers
89 views

Attaching wires to a SMT footprint

I have a pre-made motor controller which I want to re-purpose for a hobby project by pulling the MCU off and attaching to a custom control circuit (with a more powerful MCU, current sensors, etc). The ...
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0answers
52 views

How to increase SMD codes readability

is there any substance to increase the SMD codes readability when the component is very small or has a poor print on it? Some years ago I saw a video where they suggest to use alchol, but I tried ...
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0answers
35 views

identify ic component - VL7TA

can you please help me to identify this IC? it could be a voltage regulator. it's marked as VL7TA, has 10 pins at the bottom. Please see the pictures below:
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0answers
53 views

Identifying surface mount components on a video card

I'm having difficulty identifying some surface mount components on a video card I'm attempting to repair (They have been knocked off). I have a working card which i can use as reference- attached ...
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7answers
2k views

How can the ACS712 pin handle 20 A?

I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
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1answer
68 views

I have an SMD switch how can I find the part number?

I have an SMD switch but I don't know its part number. I searched suppliers sites like Digikey and ... but I couldn't find it. Is there any other way to find the part Number? The size is 6*6*5(...
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0answers
59 views

0402 SMD resistance shortcut [duplicate]

I am wiring a small plastic model with 11 yellow 3V 0402 LEDs. I used the resistance calculator to find I need as many 56ohm resisters attached to each LED in parallel to keep them running properly, ...
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1answer
47 views

How do i find Current Consumed by Circuit designed on Surface mount PCB without damaging PCB? [closed]

I have a circuit designed on PCB, and components (resistors, capacitors, diodes, Microcontrollers etc.) are all surface mount. I want to find the total current consumed by this circuit. I have traced ...
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2answers
466 views

What is the purpose of this extra PCB pad?

I am looking to use this crystal in an upcoming design and I am a little bit confused by the datasheet. The datasheet is available here: CMR200T Datasheet This is the image in question: Question: ...
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2answers
1k views

What is the effect that makes components on a circuit board move into place?

I am going to apologize ahead of time if this is a really simple question. I started learning to solder during my internship but I had no EE knowledge prior. When I was working with surface mount ...
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1answer
191 views

Identify SMD component labelled W16 95

I'm trying to find out what element is the one that is on the PCB that is labeled as QD2. On the body it has mark W16 and 95, but I couldn't find anywhere on internet what this element is. This is ...
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3answers
76 views

Electrical isolation problems when routing between pads of SMT resistors/caps

According to answers to this previous question, routing traces between the pads of SMD caps/resistors, as shown in the picture, is not dangerous as long as trace to pad clearances are obeyed and the ...
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1answer
190 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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1answer
50 views

How would I determine the ideal capacitor for a specific application

I am attempting to replace a Surface Mounted Multilayer Ceramic Capacitor in an Amiga A4000 which is described in a BOM as: Capacitor, SM, MLC, NPO, 100pF (1206) ...
8
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1answer
147 views

I need help to identify this old SMD device

I'm working on a circuit and I can't find information on this component (see picture). This hybrid circuit is part of an old industrial PSU. It is a PFC circuit based on UC3854 but I don't know if the ...
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1answer
79 views

Does Solder paste file is necessary for through hole component as same as SMD or not?

I have designed a PCB and there are only through hole components in the top of my board and only some surface mount components in the bottom of the board. Now, I don't know exactly is TOP SOLDER ...
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0answers
38 views

Identifying 6 pin SMD 23ALB7

I need some help identifying these SMD . 23ALB7 with 6 pins. They are found on a laptop TOSHIBA SATELITE L650.
5
votes
1answer
712 views

Do SMD resistors have to be reflowed black side up, or is black side down okay?

I reflow my own boards in a toaster oven. When I drop my resistors off the paper tape, I always flip them over to black side up before I place them. Should I bother if it doesn't really matter?
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3answers
57 views

0402 SMD resistance problems

I've trying make a very simple 3 LED circuit with a red, blue and green LED. I know my 3v battery will take the path of least resistance and only flow through the red, so I've added resisters to the ...
0
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2answers
34 views

reflow oven issues with RO4003 PCB

Im trying to reflow some RF pcbs in a legit reflow oven. The PCBs material is "Rogers RO4003 305 Um" and 3 layer. (Its a very thin pcb) If temperature is high enough to reflow the paste, the pcb ...
0
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0answers
87 views

Can I use SMD components or do I have to stick to through hole?

I work in a company which develops devices that need to withstand harsh environmental conditions, shocks, radiations, vibrations and whatever. Really, too many to count. In one of those devices is a ...
3
votes
2answers
170 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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1answer
59 views

Help identifying SMD on USB Circuit (Wacom Intuos 5 - PTH850)

My Wacom Intuos 5 - PTH850 Tablet have one the following SMDs (the lower one, USB Data -) cracked. Could you help me identifying which component is? I know each component bridges USB data + with ...
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1answer
105 views

How to properly connect SMD component to inner layer

I have a four layer board. The stack is divided as follows: Layer 1: Signal Layer 2: GND Layer 3: Power Layer 4: Signal I have SMD components such as an SMD fuse,...
0
votes
1answer
86 views

PCB Power Pad destroyed for TPS51125. Fixable?

While trying to fix a laptop, I was de-soldering a TPS51125. I added a bit too much solder to the power pad while wicking so I had the "smart" idea to use a solder pump to remove it... but the pad ...