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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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2answers
94 views

003V SOT23-6 What is this component

This IC produces 29.6 kHz square wave and there is no external components. What it can be? I looked at all codes and I can’t find it.
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1answer
19 views

Does the 969973-3 SMD receptacle need mounting holes?

I am designing a board that uses a 969973-3 wire-to-board receptacle. In its drawing there are specified six 1.2 mm (mounting?) holes. Does anybody know what are they used for? I've seen pictures ...
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7answers
4k views

What is this SMD component, marked as D7 with an underline?

I'm trying to identify the SMD component (marked as D7 with an underline) on a circuit board of an ARGB LED controller. I think it is a diode or resistor, but I'm not sure about it. Please can I get ...
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2answers
206 views

What is this component? Marked R5

Edited: Added more pictures. I'm reverse engineering a PCB but I'm stuck at one component. I can't find out what it is. I thought it is a diode because of the marking on top of it but when I test it ...
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1answer
121 views

Please help to identify SMD diode

The markings are: 1112 1Z The package is 2010 (5025 metric). Any clues will be much appreciated. Apparently it is located right at the 12V input. On DMM / ...
2
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2answers
144 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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0answers
32 views

how fine is fine pitch technology in SMT - is it still below 0.635mm (25mils)?

with lots of components going much smaller these days, is there any amendment in IPC for the definition of Fine Pitch Technology for SMT?
5
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1answer
228 views

How to identify SMD device marked LEFBV?

I have a SOT23-3 component marked \$\underline{\textrm{L}}\,\underline{\textrm{E}}\,\overline{\textrm{F}}\,\overline{\textrm{B}}\,\textrm{V}\$ as shown in the following images: The following ...
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1answer
35 views

Help ID SMD components

I need some help correctly identifying the U9 and U10 components on the PCB. I've tried some codebooks and I found several options. For U9: H1 - X6603 is a 300mA, low quiescent, high PSRR, low noise ...
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0answers
89 views

What LED PWM controller has marking AT508CS?

I have an LED worklight with low- and strobe-functions. One click: On - full Power Two clicks: half Power Three clicks: strobe Four clicks: Off The controller is circled: No markings on the top ...
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0answers
57 views

Move part to bottom layer without mirroring in Eagle

How can I move a SMD part in Eagle to the bottom layer without using mirror? The resulting PCB should have the SMD pads on the bottom layer but mirrored (if you turn the PCB and look on it from top ...
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1answer
143 views

How to remove kapton tape from soldered parts in bulk?

I have PCBs with SMT nuts (SMTSO2060MTJ) which has been assembled onto a PCB - the nut has kapton tape on top to allow easy pickup for assembly. However, removing the kapton post reflow is proving ...
2
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1answer
121 views

Identifying SMD component 22P W8

I've been trying to identify a component on a main board for a TV that I believe to be faulty. As I haven't been able to come up with anything that I feel confident about, I'm hoping to get some ...
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1answer
80 views

Query regarding unknown component

Hi guys I'm very new to this field and I'm having a problem with my sound devices 664 recorder. There's a faulty component and it needs to be replaced. I couldn't find the component here in the local ...
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0answers
68 views

1st KiCad design. Concerns with an abnormal circuit

I just wanted some input before sending this off for manufacture. It is for a test fixture and just has a funny circuit. Even though it seems relatively straight forward, it took a bit of finagling. ...
3
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1answer
179 views

SMD LED: How to calculate optical power (in mW) from luminous intensity (in mcd)?

I chose an LED for my application but I need optical power, in mW. In the data sheet, luminous intensity is shown in mcd but I did not find formulas for calculation although there are graphs, etc. ...
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1answer
678 views

KV7RF SMD Datasheet

Can someone identify a 5-Pin IC SMD with the marking code KV7RF? Searching in Google I didn't find anything. Any help on this?
3
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1answer
61 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
63 views

7030 SMD LED pad configuration

I have not done a lot of work with SMD LEDs and have a question about the 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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0answers
61 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
78 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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0answers
26 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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0answers
29 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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1answer
147 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
108 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
67 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
91 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
42 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 ...
4
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1answer
269 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
173 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
126 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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2answers
279 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
77 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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1answer
41 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
101 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
610 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 ...
3
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4answers
582 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
118 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
65 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
527 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
162 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
57 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
609 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
587 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
119 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 ...
0
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0answers
55 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 ...
12
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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 ...