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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What SMD is “A40” and “SB”?

here are some images of a little LED "backlight" board. It just lights two (red) high-intensity LEDs. There are two ICs on it which could use some identification help please. 2.00mm square ...
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1answer
1k views

Help me identify this resistor

I am trying to troubleshoot a faulty camcorder PCB and stumbled upon this resistor(?) that is right near the DC jack. The resistance between it is 0 Ohms. What is this component? I couldn't find ...
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1answer
67 views

Flex Cracking for 0402 MLCCs

Is there any data to show that 0402s are relatively flex crack resistant due to their size? I can find lots of references about 0805 and larger capacitors cracking due to board flex, but I can't find ...
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42 views

Need help identifying SMD, 6 pins, 3x3mm, top marking 82S

Does anyone know what it might be? Dimensions 3x3 mm, 6 pins, top marking 82S
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1answer
32 views

Need help to identify smd component of VGA adapter MSI GTX1070

I did clean my VGA adapter MSI Geforce gtx 1070 with compressed air and one smd component has gone, now the adapter did not work. On another adapter I found out the marking on the component body and ...
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28 views

Can I use common cathode PLCC 4 led to replace common anode PLCC 4 led?

I need to replace the led on my car gear shifter. From my research, I understand that I need to get the common anode PLCC 4 3528 led with green color. However, the seller sent me the common cathode ...
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43 views

What type of polarized surface mount capacitor should I use?

I am having a PCB printed by OSH Park and then I will hand-solder surface mount components onto it. For my design, I am using two polarized capacitors; one is the timing capacitor for a 555 timer and ...
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1answer
67 views

Help identifying component (LED matrix PCB)

I have a led matrix PCB without a driver and I'm trying to figure out how to control it. I'm having trouble identifying one of the components on the PCB. Here is a scheme of a part of the PCB: These ...
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0answers
44 views

Help Identify this Blue LED

Please help in identifying this blue LED, around 470nm, 3030 SMD. Has this kind of "strong blue" phosphor coating. Very interesting piece and can't seem to find it. Any help appreciated.
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1answer
28 views

identification SMD 3 Pin 3x1.5mm code 4B C39 for stereo camera

I am trying to build stereo camera using android or iphones. The pcb is from a wired selfie stick and works well. By using 2 pcb's with one push button, simultaneous photos can be taken. I have looked ...
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1answer
69 views

What could have caused this SMD capacitor failure?

I have an 0805 capacitor that has failed short circuit on a board. The maximum voltage it would see should be 16V. It has value 4.7uF, is rated to 25V and is X7R. I don't understand why it might have ...
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3answers
113 views

Is there a component that will provide an elevated SMD pad?

Is there a surface-mount component I can put on a pad, that simply has another pad on top that I can solder something on to? Here is a side view showing pins above the pads that would need bent down ...
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1answer
67 views

Making a Darlington transistor (eg: TIP120) with D882 to drive 12V LEDs with 3.3V or 5V input RPi

I am getting into circuits and trying to improve my knowledge but even though it might sound like a silly question but here is my story short: What I am trying to do I am building a circuit to drive ...
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1answer
59 views

Do the contacts on a SIM card and card holder always match?

I am trying to choose an SMD SIM card holder for my PCB but while doing so noticed a few inconsistencies for the C1-C8 locations on a product's footprint. It has got me wondering if all SIM cards and ...
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Mosfet Protection Diode Part Number 3S4L VH10

Mosfet Protection Diode Part Number 3S4L VH10 I can not find it or anything like it. It has 2 leads like a diode, but uses a Mosfet. Very low voltage drop. I am using it for reverse voltage ...
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Need help identifying this SMD

I don't know what this component is. It's found on an adblue ECU for Citroen. I suspect it's faulty and need to order it.
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1answer
65 views

Should I insulate between 2 PCB's when SMT joining them together?

I have designed a circuit board (5v, .02 amp max draw, UART and I2C comms) for an electronics project with many surface mounted components, which I have built and SMT from a house in China. When the ...
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1answer
54 views

SMD transistor identification - top marking ARRL 1S

I have an SMD transistor. As I tested it, I know it's a MOSFET, but the top code is ARRL 1S. All 1S are NPN transistors and I know it's surely a MOSFET. Please help find the correct part number.
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49 views

SMD - identify two parts

I think one is a 10uf capacitor 10-20l. Second one no idea.
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1answer
79 views

Need help identifying this SMD component

Does anyone know what this is? It's an SMD taken from a Citroen 2.0 BlueHDi AdBlue ECU that's faulty. https://i.stack.imgur.com/YZZN9.jpg! [the mosfet is to Top left above Q111. The TVS is the big SMD ...
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27 views

Identifying 6-pin SMD from LXM05AD17M2 servo motor controller

I have LXM05AD17M2 servo motor controller and I need to replace a burnt 6 pin SMD component, but I don't know what it is. I got this picture from the internet. I circled the part which I need. Thank ...
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1answer
32 views

What transistor is this with SMD marking 72C9?

I am not sure what this part could be, and using some SMD codes on the web, didn't help. The case size is either SC70 or SOT-523
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Is there anyway to get a more solid connection from pads to planes in Eagle pcb layout?

Below, in blue and white, is the suggested pcb layout from the data sheet: https://www.mouser.com/datasheet/2/468/RPX_1_0-1903909.pdf and here is my pcb layout from eagle as you can see in the data ...
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1answer
36 views

Do pads 6,7,8 have to be connected with pad 12 in this layout?

In eagle there is a line that says these have to be connected but the data sheet doesn't mention it. Here is the data sheet in case it helps https://www.mouser.com/datasheet/2/468/RPX_1_0-1903909.pdf
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1answer
34 views

What is the name of these connectors? (XBee Radio Module)

I'm migrating a design from an older through hole module, to a new module that has edge connectors. The dev kit has these nice spring loaded connectors on the carrier board where the module just pops ...
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0answers
35 views

EMI Shielding on PCB

I'm thinking about replacing an 915MHz RF module on a PCB I designed with an equivalent circuit directly implemented on my PCB to overcome some supply chain issues. The module I'm replacing has an EMI ...
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1answer
42 views

what is the smd equivalent package of BD139 transistor? [closed]

I am developing a basic switching circuit using a PIC microcontroller where the maximum drive current will be up to 2A in this case I was using BD139 but now due to my PCB has a Single-layer option I ...
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1answer
65 views

Part Identification, Board says C32 but it looks nothing like a capacitor and has 6/9 marking on it

First, I understand that you have to remove the components to fault find but this is just something to play with. It's an internal HDD SATA adapter to USB3 with additional 12VDC for 3.5" HDDS. It ...
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1answer
68 views

362J04 230AP SMD SOT23-6 PWM IC on DELL LED Monitor Power Supply

Is there any way to find the datasheet for 362J04 230AP SMD SOT23-6 PWM IC of a DELL LED Monitor Power Supply? At least a close match is good. Figure 1: PCB top view Figure 2: 362J04 SMD in DELL ...
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1answer
62 views

What is a DC block and how can I put this on a PCB?

The circuit diagram that I am trying to replicate casually mentions a component called "DC block" but doesn't go into details. I believe this has something to do with RF filtering? Will I ...
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1answer
70 views

Substitute for transistor 2N3904 that is a SMD [closed]

I have the circuit shown below and one of the components (Q2) is a common through-hole transistor. I'd like to replace this through hole device 2N3904 with a common SMD transistor that will do the ...
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1answer
43 views

What component is I5B38?

I am in the process of repairing a circuit board. Can you give me a replacement for the component outlined in red? The imprint on the board is DZ with consecutive numbering (here DZ18). Is it maybe a ...
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1answer
32 views

USB Type-C SMD connector PCB layout reference design

I am designing a board with a USB 3.2 Type-C connector from Molex, and I understand that at a possible 10Gbps, this design is going to need to be very well laid out. Is there somewhere a reference ...
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0answers
63 views

SMD Component blown in earphone circuit in S9 mobile phone - please help identify and how?

Hi all, I am trying to identify the components marked "MT" and "7" in the first picture. They are in the earphone circuit of a UK Samsung S9 G960F mobile phone. The repair company ...
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0answers
49 views

Need help for identifying SMD component

I've got a lenovo tablet (lenovo ideapad miix 300) from my friend, upon opening it, i found a burned out smd component that is the same component shown in the picture. I need help identifying this ...
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3answers
82 views

Could static electricity from trading card binder pages damage SMD components?

I bought a trading card binder to hold SMD components. I chose it because its card-sized sleeves can hold more than just tape strips and also it has a zipper. However my concern is that the clear ...
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0answers
66 views

Help me identify this smd component marked. GMCAA

This smd is in the power supply section of a small monitor. Size of ic 8 pin 5 x 3.5 mm.
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1answer
63 views

SMD part identification

Can someone help me to identify these two similar SMD components? My guess it could be SMD fuses, 0805 package. But I'm not a hundred percent sure.
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1answer
60 views

Help identify smd component

Im trying to repair a diagnostic interface, I've got a burnt chip and cant find any board data. Multimeter: diode mode in one direction reading : 1380, in other way 820 test in resistance ( 2000 ohm ...
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1answer
31 views

Question regarding Connector

Can someone please help me to understand what type of connector is the below : How do we classify this 99S12D-40MA5-y connector which is on page 33 in the Catalog document? Do we call it as a ...
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1answer
71 views

Film over an SMD LED to change its colour?

I require an RGB white + amber LED SMD chip. Unfortunately, it looks like nobody really makes such a thing except for one seller on Aliexpress. I tried purchasing a few of these only to find their ...
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0answers
107 views

Can this component be identified? Top mark is 2B with a sideways F

What do you think, does this look right? https://www.mouser.com/datasheet/2/916/PMPB215ENEA-1600076.pdf Short is gone........ This is the 1V rail for a GTX 2060 GPU which is currently shorted. I'm ...
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1answer
36 views

SMT Multi-Footprint Size to IPC standards for production

I am currently designing a board that will need end up getting CE tested, and I am currently testing the effects of different sized decoupling capacitors but I am constrained on space. I want to make ...
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1answer
41 views

what is the pitch for vssop-8?

I recently took on a personal project that requires a vssop-8 chip:ADC081C021. In order to help me solder the pins on the pcb, I ordered a vssop-8 stencil online. But when it arrived, I found the ...
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2answers
50 views

How would you connect a light dependent resistor / photoresistor/ CdS cell at a right angle to a surface mount board?

My project uses light dependent resistors (aka photoresistors or CdS cells). All the ones I can find for sale from the usual suppliers are through hole type. ie. they have two wire legs. The PCB I'm ...
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0answers
37 views

Can anyone please identify this 6 pin SMD A28L integrated circuit or what it does?

I could not find it by the code written on it - A28L. It is from a headlamp light with lithium battery and I need to replace it.
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2answers
43 views

SMD Resistor Power Rating Calculation

I'm extending my question from previously. How to find SMD resistor and capacitor value and correct size I'm doing some calculation and find something confusing below is the calculations: V = 5 R = ...
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2answers
617 views

How to find SMD resistor and capacitor value and correct size

I'm new to the SMD world and struggling to find an easy and quick way to get the correct SMD resistor and SMD capacitor size and value based on a circuit schematic; any tips will help. For example, I'...
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1answer
50 views

Help troubleshooting diy battery charge/protect/step-up circuit

I am following the schematic below trying to put together the circuit for a battery charger with over/under voltage protection and 3.7 to 5v step up. I have populated only the battery charger part of ...
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1answer
55 views

SMD SOT-23-3 device identification - top marking E8LJ0

I have a small SOT-23 (3 pins, transistor-like) device that burned out (shorted between 2 pins). I need to identify it so I can replace it, but I can't find the code at all. The code is: E8LJ0 Thank ...

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