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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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23 views

KV7RF SMD Datasheet

Can someone identify a 6-Pin IC SMD with the marking code KV7RF? Searching in Google I didn't find anything. Any help on this?
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1answer
27 views

How do I identify the SMD component marked as !3S 4?

I have a SOT-23 SMD component marked \$\underset{\bullet}{\vert}3\bar{\textrm{S}}\;\bar{4}\$ as shown in the following images I managed to find out that \$\textrm{3S}\$ stands for MMBT5551 NPN ...
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0answers
19 views

7030 SMD LED pad configuration

I have not done a lot of work with SMD LEDs and have a question about pad layout. I have done quite a bit of research and haven't found much helpful info yet. I am working with 7030 SMD leds ...
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57 views

How to remove/desolder very minute smd chips safely? [duplicate]

This is the component I'm trying to remove: BU48xx voltage detector VSOF package (attached pic)
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0answers
61 views

Need help decoding part number for SOT23-5 chip

I have a circuit board that has come out of a smart plug-in lamp dimmer/switch module. I would like to find the part number of a small SOT23-5 integrated circuit chip that is on this board. The SMT ...
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10 views

Replacement of DMP2215L P-Channel MOSFET with AO3401 from Alpha & Omega

I want to replace a faulty Diodes DMP2215L SOT23 p-channel MOSFET https://www.diodes.com/assets/Datasheets/ds31125.pdf with the p-channel AO3401 MOSFET from Alpha & Omega http://www.aosmd.com/pdfs/...
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39 views

My SMD workstation has current leakage [closed]

I have Chinese SMD workstation I bought recently for my personal projects. The problem is when I increase the soldering iron temp more than 350 degrees, it leaks current and trips the RCCB if I ...
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41 views

Do I ground mounting pins and unused pins on an smd header?

I'm looking at using a MOLEX Pico smd connector (model 5037630491) on a board. The pcb (male) side of the connector has two mounting pads labeled "nail" on one of the spec drawings. Here is the more ...
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27 views

Antenna formed from the RF module shielding wall and cover

Can anyone provide details how an antenna can be designed from RF module shielding wall or cover? More specifically if any company is making this kind of antenna product for general communication or ...
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0answers
58 views

Identification of mystery SMT capacitor [closed]

I am in the middle of a computer repair project and I have found a bad surface mount capacitor with the the text "AN3" printed on it. I have looked around online a bit and found a website which states ...
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1answer
101 views

Removed all ceramic SMD capacitors without markings on them from the board… what to do? [closed]

When I told a buddy that I am taking electronics courses and learning to manufacture simple homemade PCB boards, he found me a client with an interesting offer: To reverse engineer a small PIC ...
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3answers
82 views

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
58 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
50 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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37 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 ...
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1answer
187 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
151 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
121 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
159 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
71 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
42 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
37 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
70 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
508 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
539 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
37 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
135 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
78 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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52 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
2k 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
184 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
230 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
94 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
59 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
48 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
468 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
235 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
79 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
206 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) ...
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1answer
152 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 ...