All Questions
Tagged with pcb surface-mount
156 questions
4
votes
3
answers
534
views
What options are there to reattach/replace this pad?
This pad came off while I was desoldering a PLCC chip. I still have the pad.
As you can see I was able to scrape away to expose the via the pad was connected to and get a blob of solder onto it. I ...
- 65
0
votes
3
answers
108
views
Alternatives to SMA connectors in multiple-channel RF applications
I have a circuit with multiple input channels (~10-20), where to each channel I am applying RF voltage signals, usually sine waves, with varying frequency in the range of 1MHz to 1GHz and 0-5V peak-to-...
- 15
0
votes
0
answers
78
views
DIY board: double-sided SMD vs. joining two boards flat together?
I have this rough layout for a design with some serious space constraints:
It has connectors on both sides and the layout rules out through-hole soldering. I only have access to a Hakko IR preheater ...
- 101
2
votes
1
answer
70
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 ...
- 23
1
vote
1
answer
102
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 ...
- 15
1
vote
1
answer
85
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 ...
3
votes
1
answer
559
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 ...
1
vote
1
answer
105
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 ...
- 13
1
vote
2
answers
167
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 ...
- 133
7
votes
2
answers
920
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 ...
1
vote
1
answer
120
views
SMD small footprint problem, extending pads for more solder
I have this component (LTST-FC12WEGBD-5A SMD LED by Lite-On) that has been very difficult to use due to the pad sizes being so small.
Below is the footprint.
The problem is with the smaller square ...
0
votes
2
answers
52
views
Courtyard Determination for SMT Trimpot
I would like to use the Bourns PVG3G103C01R00 in a design and am trying to figure out how to determine the courtyard for this part, compliant with IPC-7351B. I do not currently have access to the IPC-...
0
votes
1
answer
184
views
Identify SOT-23-5 component marked 8311 J1A9
I'm working on a circuit, and I can't find information on the component shown in the picture:
Close-up
Surrounding circuit
The component package is an SOT-23-5. It is marked "8311 J1A9." ...
- 11
2
votes
1
answer
84
views
FFC connector with solder terminals on cable entry side
Are there any FFC connectors that have all solder pins on the same side as the FFC slot (i.e. where the FFC cable is inserted).
I know in most situations / designs this wouldn't make any sense, but I ...
- 43
0
votes
1
answer
106
views
An unknown SMD inductor on DVD PCB
Here is PCB taken out of Eplutus portable DVD player. Broken SMD inductor is soldered out because it is cracked in half. It is L 46. I need to know its parameters/values.
2
votes
1
answer
105
views
Identify component: SOT-23 "ADSL" "19"
Pictured is the power section of a midi controller mainboard. It's a PreSonus Atom SQ (The motherboard is labeled "BEEP_Main_Board_V3.0").
The sad story is that it was bought 2nd hand and ...
- 21
1
vote
0
answers
275
views
I need help identifying a component on my ps vita motherboard
I need help identifying a component on my PS Vita 2000 motherboard. It seems to be a resistor of some sort that is connected to the ID pin out for the micro USB and it is a millimeter in length.
I’m ...
- 21
1
vote
2
answers
211
views
NPTH through SMD pad
I'm trying to incorporate this design for an 18650 battery clip into my PCB. I'm using KiCad.
If you look at the datasheet, you'll notice that there's actually two tabs sticking down from both ends of ...
- 11
2
votes
3
answers
1k
views
Identifying an SMD diode
I have a small PCB from an automotive button.
I would like some help to identify the diode. I am not finding a lot if I search for 1429. My multimeter in diode mode gives 740 mV (diode in situ).
Since ...
- 201
3
votes
3
answers
2k
views
What is the difference between 1206 and 0612 (reversed) SMD resistors?
I wanted to know what is the difference and if a 1206 resistor can be chosen as second source of a 0612 if the other specifications are the same
- 31
0
votes
1
answer
64
views
What SMD components from an LCD control board are these?
The reference designator of the first unknown component I'm asking for is "AC1". And then I can't find anything similar to the 10 µH pictured below too. It's around 1.2mm tall and has a ...
- 103
0
votes
1
answer
97
views
Best way to hold a slightly twisted, castellated-hole PCB board to another during reflow/hand solder?
I have a 31x61mm PCB with castellated holes that are slightly twisted - enough to prevent it from having great contact to the other PCB during baking.
What I currently do is place the PCB by hand and ...
- 178
0
votes
1
answer
292
views
Aluminium PCB - Bottom Entry Connector
Is there something like this connector that is easier to buy? I need to find something that lets me connect an aluminium PCB to an FR4 PCB with part of the enclosure between them. The part of this ...
- 133
0
votes
1
answer
75
views
5
votes
1
answer
351
views
What are these PCB coax holders called?
I have RG6 coax which I need to attach to a board and would like
to use a strain relief method as shown here:
What are these connector "claw grip" things called?
I believe this "claw ...
- 728
1
vote
1
answer
209
views
Disobeying recommended pad size of 0603 LED
I need to pack a cluster of 0603 LEDs (https://docs.rs-online.com/c349/0900766b81180479.pdf) as close together as possible on a PCB. The datasheet recommends a pad-to-pad width of 2.3mm.
As the board ...
- 753
0
votes
2
answers
202
views
Thermal issues: surface mounted on 1" x 1" FR4 board
A number of parts are rated at certain thermal impedance with a note, something along the lines of
surface mounted on 1" x 1" FR4 board
like in this datasheet for instance - MOSFET Vishay ...
- 1,061
4
votes
2
answers
680
views
Shorting (connecting) two pads that are on opposite sides of the PCB
I have a PCB that has two rectangular pads on either side of the PCB, exactly opposite to each other. They need to be temporarily shorted (connected) to allow setting of some parameter through ...
- 41
0
votes
0
answers
97
views
Do entire IC labels need to match? ULN2803A replacement
I burned out an IC on my OmniLogic pool controller and am looking to try to replace it. I've never attempted repairs with ICs before, and don't know much about them. The chip is a TI 1CZRL34 ULN2803A ...
0
votes
1
answer
325
views
Proteus Ares traces do not connect
I am trying to connect a Vcc pin to a power source in Proteus Ares, but it does not let me do anything different from what I designed in Schematic Capture.
How can I connect the selected trace to the ...
0
votes
1
answer
143
views
SMD components and PIC microcontroller
I'am working on a digital clock project with a PIC16F877. I'm designing the PCB with Proteus. The PCB contains mostly SMD components and I don't have any experience with that so I have some questions:
...
0
votes
1
answer
168
views
I can't find the SMD package for a buzzer in Proteus
I am new to SMD Technology. For the circuit with a PIC microcontroller I am designing, I need to use a buzzer but I can't find the right SMD package for it. What SMD package can I use for a buzzer? I ...
2
votes
4
answers
894
views
Identify part and how/where to order it from
I'm trying to fix a board in my overhead fan unit above my oven (there was a power event at the house). I have located the chip that was burned, but couldn't identify the chip.
I was forced to ...
- 23
1
vote
2
answers
211
views
Keepout region for Molex SMD connector footprint
I am trying to understand the technical justification to have a keepout region around the 2 large outer pads of a Molex connector (PN# 5055670881).
I would like to have more area around these outer ...
4
votes
1
answer
365
views
SMT Reflow solder quality issue with SN42/BI58 paste
I have been doing hardware design and PCBA prototyping for a while and I have issues with quality of reflow soldering. I have a small lab including a pick'n'place machine, stencil printer (eC-stencil-...
- 453
2
votes
1
answer
947
views
What are wettable flanks in semiconductor packages?
What are wettable flanks? Is there any difference between packages with wettable flanks and other leadless packages?
Can we say the package given above has wettable flanks?
14
votes
1
answer
2k
views
Are surface mount or through hole connections more reliable for safety critical applications?
While obviously factors like safety certifications and margins of error are more important when it comes to safety critical applications, e.g. aerospace, I saw an article that said that one of the ...
- 243
0
votes
0
answers
82
views
QFN-28 REVERSE Breakout Board
I am trying to build a PCB board that I found on GitHub. In a rash we ordered few sets of the PCBs without inquiring about the parts availability. Turns out one of the parts is not available in all ...
- 109
2
votes
1
answer
231
views
Problem with LED lamp PCB
Problems:
RED – PCB trace gets blown up.
PURPLE – There seems to be some arcing from the live terminal to the resistor on the side, which results in a bridging that blows the traces between.
So far ...
- 21
0
votes
2
answers
106
views
How to infer resistor size from the manual of this microcontroller board?
I have STM32's NUCLEO-F302R8 board. The manual is given here. I couldn't find any PCB design file for this board so that I can open it in KiCad, Eagle,etc..
From the manual I couldn't figure out the ...
- 1,859
2
votes
0
answers
86
views
Connector identification for Avermedia C875
I have an AverMedia C875 device, I would like to capture an analog output of my VCR with it. The device has a specific connector for such purposes, but I sadly don't have the dongle that originally ...
- 31
0
votes
1
answer
325
views
Restrict layer issue in EAGLE using C1206F334K1RACTU capacitor
I've been trying to google this problem and find solutions in this forum as well, however, as I am still new to EAGLE and posting in this forum I'd appreciate any advice.
I have been trying to connect ...
15
votes
2
answers
1k
views
Unknown SMD Component
I'm trying to find the components of the PCB I have. I have a problem with a 5 pin (SOT23-5) component. Can someone help me with this?
There are version1, version2 and version3 of the PCB and marking ...
- 673
1
vote
1
answer
736
views
What is this through-hole component holder used on aluminum PCBs?
I've been buying these cheaps LED lightbulbs and tore them down to see how the LEDs are driven.
On all of them I have found this surface mount component that allows a through hole component (here a ...
- 81
0
votes
1
answer
651
views
Trying to fix a possible non-removable permanent fuse
I'm having some issues with a PCB in an alarm unit. I think the unit shorted. I'm now trying to identify the broken component to replace it.
The board is mains powered, but also has a battery - ...
3
votes
2
answers
106
views
SMD to DIP question
I bought one of these modules: https://www.decawave.com/product/dwm1000-module/
The problem is that its pins are very close together, they are not the same size as the traditional breadboard. I ...
0
votes
2
answers
241
views
Aligned vs not-aligned components: Which is better for PCBA process?
I am designing a Raspberry Pi hat PCB for a home automation control project.
It contains many SMD resistors and capacitors.
I was just wondering if aligned components have any benefit over not-aligned ...
- 73
6
votes
2
answers
1k
views
What is this bridge like component?
As I was looking at some Texas Instruments evaluation module, FDC2214EVM to be precise, I found a component unknown to me:
- 159
2
votes
1
answer
489
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 ...
- 73
2
votes
1
answer
1k
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 ...
