Skip to main content

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.

Filter by
Sorted by
Tagged with
1 vote
1 answer
118 views

Unknown SMD component - PCB Designation question

I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
user388256's user avatar
0 votes
0 answers
32 views

please identify this 6 - pins smd with code DBXCLC [closed]

I can't find anything with mach a 6 pin smd chip marked DBXCLC. It shoud be a part of buck converter step down or dc to dc converter with 12Volt output (input 30 - 45 volt). I'm looking for a ...
Antonello Caraceni's user avatar
5 votes
1 answer
755 views

What is this rectangular SMD part with a stripe along one of the long edges?

The dimensions are 1.60mm x 3.20mm. Schematically, the side without the white stripe is connected to this node in a buck/boost converter... Here is the part in context, with the transistors Q1-Q4 ...
bigjosh's user avatar
  • 10.2k
1 vote
1 answer
49 views

Need help with identifying a SMD part

Can anyone please help in identifying this SMD part marked with "CP6W"? This is part of the power supply of a 8 inch tablet from China, "Chuwi Hi8 pro". My findings as of now are: ...
Harry S's user avatar
  • 13
2 votes
2 answers
230 views

Need help implementing a 16x13bit ROM

I'm trying to build a tiny "hex font ROM" analogous to the ones embedded in for example the HP TIL311 and am pretty much unable to find useful parts. Since it's for hexadecimal, I'd need 16 &...
nonchip's user avatar
  • 207
2 votes
1 answer
54 views

Unknown SMD Component LP 27 L#

I'm trying to identify and find analog for the smd component on a PCB. The PCB is a an engine control unit from Mersedes W168. The unknown component is a 2-pin polar component in the red circle. The ...
iu-m's user avatar
  • 23
15 votes
4 answers
3k views

How to join two PCBs with a very small separation?

I want to join two PCB boards with "Headers" type connectors, like this image: But the separation between both PCBs must be 4.8mm, as shown in this other image. But with the connectors ...
Fabián Romo's user avatar
0 votes
1 answer
81 views

8 pin SMPS controller chip

I have a 12v 10amp SMPS unit, the main controller ic was damaged and broke apart on removal - hence no markings retrievable. Is there any way to narrow down to possible matches of the controller chip ...
Sundeep Goel's user avatar
0 votes
0 answers
59 views

Help in identifying SMD SMPS driver chip

please help in identifying this chip (use in 12v 5a SMPS board for a driver LED)
Sundeep Goel's user avatar
3 votes
1 answer
402 views

Identify an IC labeled LB21

What is this IC? Trying to find a datasheet for it. Best I can make out from markings is: LB 21 Package: SOT-89-3
Monesh Rathod's user avatar
1 vote
1 answer
55 views

Matching SMD footprints to transmission line track width

I created a simple transmission line on a PCB (coplanar waveguide) between two SMA connectors. I obtained the track width based on JLCPCB's Impedance calculator for the 7628 stackup. The track width ...
Hikikomori's user avatar
-1 votes
1 answer
87 views

Use of crystal oscillator ‎ ‎

Can I use this crystal oscillator instead of the crystal in this picture? ESP8266 Hardware Design Guidelines If so, can you explain to me how, I have to connect the crystal?
Frederik's user avatar
0 votes
0 answers
56 views

Connection of SMDs to non-upper-layer ground plane of a multi-layer PCB

Can SMDs always only automatically connect to a plane on the same side, so, if the SMD is put on F.Cu or B.Cu (as it physically can't be put into the PCB), the plane must be on exactly this layer? I ...
Tintenfisch's user avatar
0 votes
1 answer
66 views

Is there flux that doesn't brown under heat?

Adding flux (MG8341) to rework a component is resulting in ugly brown stains as shown in the picture below; this is a flexible circuit board with white cover-lay. The flux started to turn brown add ...
KJ7LNW's user avatar
  • 2,022
3 votes
1 answer
223 views

Identify 5 pin smd marked "KV.." from motherboard led tv Panasonic

Identify 5 pin smd from motherboard led tv Panasonic that burned.
Putri's user avatar
  • 31
2 votes
1 answer
101 views

Strange Resistor Situation

I am looking at a schematic for an RF sensing switch, and I notice that there are two resistors that are marked in the schematic as 18 Ω resistors. They are 2512 SMT types and are installed in ...
ChrisP's user avatar
  • 21
0 votes
0 answers
24 views

Troubleshooting power issue in LilyGo T4-S3 ESP32

I put a custom expansion board onto the nice T4-S3 devices' 2x15 header. But displaced by 1 pin (2 pins off) and shorted something out. Need help on how to troubleshoot and id the destroyed components....
Diego Alacerna's user avatar
1 vote
1 answer
56 views

Identify smd component ( p_j89 ck)

I have electronic board of level switch device. I have a problem in it a found an element it seems like a diode but I need its data sheet to find a replacement for it because it is short circuit in ...
Abdelrahman Esmat's user avatar
1 vote
2 answers
73 views

Are multiple SMD Chip Resistors in Series as Safe as a Wirewound Resistor for Mains Voltage?

I realize SMD Chip Resistors are not recommended for Mains Voltage and it's no wonder since their maximum voltage rating is lower than 100 V. I also understand that WireWound Resistors are recommended ...
Dinis's user avatar
  • 73
0 votes
1 answer
30 views

Troubles in understanding the TGA2214-CP microwave power amplifier datasheet

The datasheet of the Qorvo microwave amplifier is here. I have troubles with the following points: In p. 9, they give a schematic of the way to mount the amplifier (I believe). But at the end of the ...
MikeTeX's user avatar
  • 1,898
0 votes
1 answer
47 views

Soldering flux and cleaner for analog SMT boards

I decided to build some precision analog circuits and will need to solder a few parts (on a surface mount board). So far I have soldered almost exclusively digital or non-precision analog and almost ...
Davide's user avatar
  • 101
0 votes
1 answer
36 views

Locating the temp sensor on motor controller

I am helping my neighbor with fixing his out of warranty EV UTV. I have narrowed it down to a faulty temp sensor. -Controller: Curtis 1234SE 72vdc 3Ph VFD. Fault code:15. What would a label next to it ...
ClintG's user avatar
  • 1
5 votes
1 answer
275 views

Can anyone identify this 6-pin SMD integrated circuit? (multi-charger)

This is a part of the ISDT N16 multi-charger. The part labeled BF seems to be broken. I think it's SOT-23-6, but I'm not sure. It is connected in parallel with a gate of 8 FETs and is presumably a ...
festool's user avatar
  • 51
2 votes
1 answer
68 views

Help identifying SMD diode

I'm retrofitting an 8BitDo Pro 2 controller for a project, and in doing so I melted one of the components on the board. I'm looking into ordering another one, as it was the same as another component ...
J_R's user avatar
  • 21
0 votes
1 answer
35 views

identifying component 12QF 65I COVQ

Can you please help identifying this component with top marking: 12QF 65I COVQ Device: an earlier 2020 revision of Xmos isolated I2S USB interface
cserl's user avatar
  • 13
0 votes
1 answer
34 views

Identify smd top marking ADLG

Can you please help to identify the 8 pin component with the top marking: ADLG? It was in an earlier 2020 hardware revision of this circuit: enter link description here
cserl's user avatar
  • 13
1 vote
1 answer
66 views

Please help identify this component 1.6 x 2.9 mm 6 pin SMD, SOT26 package

I am having no luck identifying this SMD. I tried all my usual reference tricks but still no success. This is the whole board. The red arrow bottom center points to the component in question. I am ...
De P's user avatar
  • 11
0 votes
0 answers
34 views

YR5iD marking code SMD IC

I have a 5 pin material, but I couldn't find the code, can you help. There is also hcpl0601 connection with 1pc ds75176
Electronic repair's user avatar
1 vote
1 answer
52 views

How to determine contacts to jump a SMD button on garage door remote?

I am attempting to control my garage door remote using a Raspberry Pi controlled relay. I have done this in the past with other remotes (i.e. the relay part is not an issue), but my new house's garage ...
Oliver Cooper's user avatar
1 vote
1 answer
101 views

What features to look for when buying a microscope?

I have been looking at different microscopes for soldering, specifically for micro-soldering (SMDs). I have seen the dinky USB microscopes, the smaller pedestal-type with small screens, units mounted ...
agarza's user avatar
  • 113
2 votes
1 answer
430 views

What is this part marked WH5 33?

What is this part and what is its part number? I can't find a part with the code WH5 33.
Ahmad Abd El Maksoud's user avatar
0 votes
1 answer
89 views

LCD PCB component identification, SOT-23-5, "DK-NON"

I have a question about an SMD component that blew up on my microscope's LCD PCB. It has 5 pins (2 on one side and 3 on the other), the lettering on the back says DK-NON. enter image description here ...
Warlock1663's user avatar
1 vote
1 answer
68 views

Need help identifying a rotary switch component

I've tried all kinds of rotary encoders and rotary switches, but none seem to match this one exactly. It is from an old car radio (many radios have them). When rotated, the current flows through one ...
Programmer's user avatar
2 votes
1 answer
112 views

Identify 3 terminal SMD device, probably NPN transistor or FET, marked BKZE7

I usually manage to find myself, but with this one I am stuck completely. I suspect it must be some kind of NPN transistor or FET. Most probably part of the marking is manufacturing site, but I also ...
Anonymous's user avatar
  • 7,120
2 votes
4 answers
902 views

I obliterated a ceramic SMD, how to find out what piece it is?

this is from a laser GRBL generic from China, 12v and 5v. The neighbor SMD appears identical to the one that was cracked. The multimeter measured 1.0 mega and milliohms, I couldn't get a reading. Do ...
bandybabboon's user avatar
1 vote
1 answer
85 views

Identify SOD882 diode marked F1

I am trying to identify a diode on a Turtle Beach controller. I can't find what diode this could be.
mik ikiki's user avatar
4 votes
1 answer
391 views

identifying an SMD component (marked as 1J15)

I'm having issues identifying a SMD component (the one marked with "1J15"). The component is a part of a differential circuit breaker. Here's the picture : Its length is 2.7mm. To me, it is ...
Maxime's user avatar
  • 143
3 votes
1 answer
117 views

Resistors lose resistance after a while

I have 3 different batch of resistors (10k 0805 SMD) which all fail the same way. I am supplying 5V across the resistor, with an ammeter connected in series. For the first hour or so everything go as ...
George's user avatar
  • 31
1 vote
1 answer
57 views

6-pin SMD identification on BMS smart controller

Can anyone help me identify the component in the attached picture? I've never seen a similar package.
salvatore cirasa's user avatar
3 votes
1 answer
538 views

Help me identify an SMD diode

I have a faulty power supply circuit of a PELCO PTZ camera. It has a burnt diode with the marking CT 6DZRS. I can't find the exact specs or type of the diode. The image is attached Help will be much ...
Abdullah Shafiq's user avatar
0 votes
1 answer
78 views

Identify SOT23-5 IC marking 834sx inside mains power adapter

I have SOT23-5 SMD IC with markings 834sx From inside 17V power adapter: I need help identifying that IC used in the mains power adapter.
Berk 's user avatar
  • 11
1 vote
1 answer
74 views

Identifying SMD component on a dash camera PCB

I was installing a dash camera into a vehicle and didn't realize the input voltage for the camera was only 5 V instead of the 12 V I obtained from the car. Once plugged in the camera let out the magic ...
Morgan's user avatar
  • 13
1 vote
2 answers
153 views

Identify part marked 'Z14' or '214'

Need help identifying the 6 pins SMD IC. This is a push button controller for servos with LEDs to identify position. Appears to say either Z14 or 214. Close up: Bottom: Original image: https://i....
Chris Schlodder's user avatar
1 vote
2 answers
154 views

What is this mystery footprint on my PCB?

Doing some repair work on a Yamaha FGDP-30 finger drumming instrument, and I came across this unpopulated footprint on the main PCB The CN999 label and proximity to the main IC lead me to believe it ...
Nick Badal's user avatar
7 votes
2 answers
898 views

Which type of female connector is this?

I am reverse engineering a smart LED bulb. I have almost got the all of the components, but one thing I couldn't get is the connector highlighted below. The LED bulb has 2 PCBs: the vertical PCB has a ...
Muhammad Haris's user avatar
0 votes
0 answers
147 views

What is this 6-pin SMD from an ethernet switch?

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 an ethernet switch and I need to replace it. The switch accepts ...
Hossein salamat's user avatar
0 votes
1 answer
43 views

SMD component on a dotmatrix printer driver board

This SMD (code: 327G) is mostly used between data lines from the microprocessor and (possibly) some solenoids of a dot matrix printer. So it should be some switching device. I redraw related part of ...
kemal's user avatar
  • 95
1 vote
0 answers
55 views

Identify 433MHz RF interface chip with markings `119B D904 125`

I'm trying to identify an unknown QFN chip originating from a door/window contact sensor. The sensor is manufactured by Climax but the manual has little clues, besides model number ...
kiler129's user avatar
  • 121
2 votes
1 answer
315 views

How to identify surface mount electrolytic capacitors?

Various surface mount electrolytic capacitors seem to have no consistent marking method. Here are some examples: (Image sources: 1, 2, 3) How can I identify what value and voltage rating these are?
JYelton's user avatar
  • 34.3k
3 votes
2 answers
155 views

Cheap vs. expensive reflow oven

I am trying to build my capacity to solder SMD onto two-sided boards. As far as I understand, for example from this post, a reflow oven is better than a hotplate for reasons of uniformity in ...
villaa's user avatar
  • 139

1
2 3 4 5
24