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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43 views

SMT Machine Feeders

I am trying to set up an SMT line. The company that I am interested to buy the pick and place machine from asked me to provide a list regarding feeder quantity. I have included the width of the reel ...
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3answers
268 views

How do I get pin headers to reflow flat to the board?

I work for a small company as an apprentice. We build mostly mass produce double sided PCBs. We are having trouble keeping the pin headers flat to the PCB through the reflow oven process. The first ...
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What is this SMD component, component designator B7?

What is this SMD component, with component designator B7 on the PCB?
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what this is smd sot23-6 marking code 63

i need help. I have problem with resistive touchscreen 4 wire, I've replaced with a new touchscreen but it still doesn't work. Capacitor & other part around ic is normal. I think this ic damage. ...
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1answer
68 views

KiCad leave room for optional through hole resistor on top of default SMD?

I was wondering how one would go about creating a footprint for an SMD resistor leaving room for a through hole one to be soldered on top should one wish to adjust the value, a bit as seen on this PCB ...
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47 views

SMD diode part number and manufacturer from marking code

Please help me to identify the part number and manufacturer from the package marking "724 C E" on the SMD diode which I have attached here.
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SMD high voltage resistors and capacitors

In my current design, just for uniformity I wish to keep all the components as SMD. There is one copper line on the PCB which goes up to 1000V (with current in milliamps obviously,) for which I need ...
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2answers
90 views

DIY Repair but want to know if I have the correct part [closed]

I am wanting to make sure I have the correct SMD piece to fix this laptop. A while back had a laptop that burnt out, wanted to repair it myself instead of paying the company to repair it instead ...
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37 views

Identify these two components (presumably voltage regulators) - top markings "25M 95" and "812CC"

Below is a photo of the components. The PCB is 12V battery powered. It's still actually working and I'm just looking at its circuit to get some ideas for my project. I think the two components are ...
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63 views

Convert a through-hole type circuit board to SMD type

I want to replace the through hole parts of the following circuit with SMD parts (control section.) This is an 80W FPC using L6562A. Is this a straightforward action or does it require further ...
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1answer
69 views

I'm looking for an SMD diode in a (small) haystack, hearing aid repair [closed]

It works, but it buzzes through the earpiece if you turn up the volume much, I'd like to do some signal tracing, but first I'd like a schematic. I found one using 3 NPN transistors that might be close,...
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97 views

Help regarding identification of a DC-DC ic bearing the print "ER=1B 73H" in a faulty BOE-hm185wx1-400 panel

I am having a faulty BOE-hm185wx1-400 panel, where the MLG voltage has dropped to 15 V instead of the usual 25.4 volts. After a bit of diagnosis, it appears that the DC-DC ic below is possibly faulty. ...
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1answer
73 views

Ceramic capacitor, does the size matter?

I am making a buck power supply and I need on the input and the output 4x 22uF @ >5V ceramic capacitor. Even at 10V I find plenty of cheap X5R MLCC in the sizes 0603, 0805 or 1206. By looking at ...
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60 views

Is there anything that can replace this part?: AP7333-33SRG-7 [closed]

(It's my first experience in this field and it's my first question on this site, so please understand that my question is awkward.) Part in question: mouser.com/ProductDetail/Diodes-Incorporated/...
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1answer
99 views

Why does this 3V linear voltage regulator output 1.6V?

This regulator in my faulty airplane remote that can't turn on is outputting unstable voltage that swings around 1.6V - 1.5V at pin 5. My multimeter shows that the input voltage is stable at 3.3V on ...
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1answer
70 views

How do I find a replacement for this SMD voltage regulator (top marking "ODM")? [closed]

The 5 pin SMD voltage regulator: I need to replace this component because it is shorted (I think because it is extremely hot.) I am having trouble identifying which one to buy online because there ...
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1answer
149 views

Why do I have shorts/bridges on QFN packages on PCBA during assembly? Stencil Printing problem

I am trying to do a home assembly of PCB but I have issues after reflow soldering. Especially I have bridges/shorts on the pins of QFN packages. I have assembled multiple boards other joins are okay ...
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82 views

How to identify SMD component

I am trying to investigate an issue with an FPV quad that I have, on my flight controller, there is continuity between the ground and 5v pads, people tell me this means that one of the 5v regulators ...
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1answer
116 views

Identify this burnt SMD component marked QA / RA14

I hope to repair a PCB for a hard disk drive which has a burnt out SMD component. It has a connection at each end, with a polarity(?) line at one end. It has "ON" in a circle, and "QA&...
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73 views

Alternative IC mounting options

I have a nice bunch of TI LDC0851 inductive proximity switches and would like to use them for some anti-tamper experimentation, but their connection is 3x3mm WSON-8, which as far as eBay, Digi-Key, ...
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0answers
38 views

Advantages of PML SMD Film cap from Rubycon over other SMD film caps?

SMD film caps like the WIMA SMD PPS line (with high capacitances of >1uF to ~10uF) are usually huge with 2220 to 6054 footprints. Does anyone know the tradeoffs of these Acrylic Rubycon PML film ...
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Solder SMD on through hole

Can I just solder an SMD part directly on the through holes of the PCB? The pitch of SMD matches the pitch of the through holes.
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1answer
67 views

Help to identify an SMD SOD-123 diode

I need to replace a diode on heavily damaged board. Unfortunately, I don't have any schematics. It is an SOD-123 package (I measured it and it is around 3.6 mm width.) Is there a way to identify it? ...
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2answers
81 views

Replacement of a ceramic smd capacitor without diagram or screen printing

I was tasked with trying to repair a Samsung motherboard from a NP740u3M laptop with a BA92-16998A model board, a drink has been spilled there. It is a fault of ceramic smd capacitors. I'm looking for ...
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1answer
166 views

What is the purpose of voids near thermal pad in a MOSFET?

http://www.aosmd.com/res/data_sheets/AONP36336.pdf Why do MOSEFT manufacturers provide a void as shown below?
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Creating a wire break alarm exclusively with surface mounts

Also called wire cut circuits, alarm circuits, etc. Basically a circuit that, when a wire loop is cut sends a signal out like a NO switch being pressed. I've made them before and it's mostly going ...
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1answer
87 views

Please identify microchip with 8 pins as in the picture [closed]

It is written on the outer cover as shown in the photo.
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1answer
64 views

please identify 5-Pin R1K SOT-23 Package

[![like this ][top mark ][R1K] in the topmark R1K
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2answers
306 views

Re-reflow SMT boards

A SMT supplier messed up the reflow process of several PCB, though I have to urgently ship. As seen on the picture, the reflow temperature was too low and thus the solder did not properly flow on some ...
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1answer
106 views

please identify this 6 - pins smd with code Z17B

on the cover code Z17B with6 pins bar on the numbers
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1answer
59 views

RF ground capacitor broken off on Raspberry Pi 4 - How does it affect performance?

Observe the following image: A small SMD capacitor near the J4 display connector has broken off on my Raspberry Pi 4 Model B. WiFi appears to function normally on the 5GHz band, but I'm very curious ...
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1answer
94 views

Can you help me identify these SMD components?

I'm trying to repair a Nintendo Switch. I've noticed that the board is missing 2 SMD components. The little one seems to be a 0 ohm resistor, but I still can't identify the one with 5 legs (3+2.) I've ...
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1answer
25 views

Micro switch replacement in LG CM2630b CD reader

I'm trying to fix the CD reader in my LG CM2630b Micro Hi-fi System that suddenly stopped working: it doesn't detect when I'm trying to insert a CD. After disassembling it, I found that the problem is ...
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36 views

Determining reflow oven temperature wave and best practices

I am new to reflow soldering and am wondering the general approach for determining reflow wave setpoints. The solder paste I am using is MG chemicals data sheet and am using several decently ...
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2answers
296 views

What could this unmarked SMD just before mini USB connector be?

It seems to be connected to D+ and D- pins of mini usb connector.
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1answer
51 views

Solder pad dimensions for small SMD

I'm currently designing a board and one of the SMD components has a particularly small package of 1.5x2.5 mm (CYSJ106C datasheet). It doesn't have a recommended landing pad in the datasheet and these ...
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60 views

Need help finding what this component is - top marking L5 (sideways X)

I am currently working on a GPS and I am having trouble finding what exactly this component is. Can someone help me identify it? First photo: component Second photo: removed component with nearby ...
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1answer
78 views

Unknown 8pin smd component marking 2050

This is a component off my fisher & paykel dishwasher controller. Based on how the circuit it is in, operates: When pin 1 is hi, pin 4 will connect with pin 2&3 which connect to GND. Pin 4 is ...
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1answer
58 views

Choosing an SMT capacitor size (and voltage) for high-power RF coupling at 300W

I'm looking for an SMT capacitor that can couple 300W at 144MHz on the output side of an LDMOS bias. This answer talks about wattage dissipation based on ESR, so I can figure that out; my questions ...
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2answers
927 views

Solder paste storage

Solder paste should be stored in a refrigerator and it has an expiration date. But what exactly will go wrong when it is stored at a higher temperature or past its shelf life? From what I know, solder ...
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1answer
69 views

Can someone identify a resistor with only markings on it see TP?

I am trying to repair circuit boards that fried on my hydraulic anchors (Power Poles) on my boat. Both have the same resistor fried. I have found the same one elsewhere on the board, see pic. I ...
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44 views

Unknown MCU in LQFP 100 package

Does someone recognize this microcontroller? It has 100 pins, and looks like LQFP package. UART is 5V out, so it's not 3v3 IC. It also has 2 CAN channels. https://www.microchip.com/ParamChartSearch/...
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1answer
70 views

Why do some SMA connectors have a rectangular center pins?

I came across an edge mount SMA connector where the soldering portion of the center pin is rectangular rather than round like normal. My initial assumption is a stronger solder joint. Any other ideas? ...
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2answers
83 views

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
73 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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0answers
92 views

Need help identifying SMD, 6 pins, 1.6x1.6mm, top marking 82S

Does anyone know what it might be? Dimensions 1.6x1.6 mm, 6 pins, top marking 82S. upd: This is CarAudio Board Motrex MXTM200.
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1answer
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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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47 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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46 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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