26
votes
Is this a zero ohm resistor?
That cuticle shape of the pads is characteristic of ferrite beads, for some reason. As is the black sides of the part.
Resistors typically expose the alumina substrate on the sides:
It's hard to ...
- 331k
24
votes
SMD 0402 resistor flipped on its side
It's called "billboarding". The IPC standard is mute on the precise reason, but it notes that billboarding may occur during assembly. That condition is acceptable for all three IPC classes ...
- 7,210
18
votes
Accepted
Solder SMD on through hole
For DIY project, no problem.
If you manufactured a large quantity then you'd have to care about having a low number of defects which means taking care of all the details. But for one-off DIY projects, ...
- 59.6k
17
votes
Accepted
What is this bridge like component?
It's just a test point for easily attaching a scope probe ground.
The silk screen indicates it is connected to ground, there may be some for other signals although they are usually just small round ...
- 29.6k
15
votes
SMD high voltage resistors and capacitors
Is there any SMD component that I can use?
You have to employ tricks when you have 1 kV around like putting a bunch of lower voltage rated resistors in series (as per the light blue block below): -
...
- 384k
14
votes
Having a hard time identifying this component; maybe the logo can help
It very much appears to be a 4601 dual MOSFET.
The "Q" in "Q6" next to the component indicates it is a transistor device.
A single MOSFET would have four pins on one side connected ...
- 2,073
13
votes
Accepted
SMD 0402 resistor flipped on its side
As stated in vir's answer, the issue is called billboarding.
is this defect always caused by an incorrect pick-and-place setup, or can it happen during reflow in a phenomenon akin to tombstoning?
It'...
- 17.4k
12
votes
Accepted
SMD high voltage resistors and capacitors
There is the Bourns CHV series of high voltage resistors. The CHV2010 model can stand up to 2 kV and CHV2512 up to 3 kV continuous.
However, clearance and creepage requirements are often larger. For ...
- 4,719
11
votes
Accepted
Whats's the electronic component in this picture called?
99% sure it's a 3.3V linear regulator. Clues:
33 marking on the package
I (input), G (ground), O (output) markings on the PCB.
Potentially a part like AZ1117CH2-3.3TRG1, which has the same pinout:
- 7,450
11
votes
What kind of tactile switch is this?
This is a familiar feature in DSLR shutter controls- partial press for focus and full press for shoot.
Here is a lower profile switch from (major Japanese switch manufacturer) ALPS. They call it a &...
- 331k
10
votes
SMD high voltage resistors and capacitors
There are some large case (e.g. 1206, 1210, 1812, 2512) capacitors in pF and nF range having at least 1kV rated voltage.
For resistors, things are a bit different. For example, today's 1206 case ...
- 17.4k
9
votes
SMD high voltage resistors and capacitors
You do place them in a series string, for example five of them. Also keep in mind that miliamperes on kV range is high power and dangerous.
HI Res photo - Courtesy of EEVblog
- 23k
9
votes
Help please with this SMD identification - SOT23-6 top marking F1TL
Most likely it is a AO6601 MOSFET, a complementary n and p channel pair in a single package.
Here is a package marking description.
And here is a datasheet.
- 91
8
votes
What is the purpose of voids near thermal pad in a MOSFET?
It's called a wettable flank to make the soldered joint easier to inspect. If part of the pad reaches the side, a correctly soldered joint with enough paste that reflows correctly will develop a ...
- 7,210
7
votes
Is this a zero ohm resistor?
It's likely a 0805 ferrite bead. https://en.wikipedia.org/wiki/Ferrite_bead
For example: https://www.digikey.com/en/products/detail/laird-signal-integrity-products/HI0805Q310R-10/806633
- 4,613
7
votes
Accepted
Is this a zero ohm resistor?
It's hard to tell definitely what it is without measuring its complex impedance at several frequencies. If you do any sort of component-level repair, having a network analyzer with a component test ...
7
votes
Accepted
7
votes
Accepted
Help identify IC
Found it, and deleted my previous answer. How ironic was finding the IC after saying "almost impossible to find" (facepalm).
Anyway, here it is: AOZ1282
What we did wrong was to Google "...
- 17.4k
7
votes
Unknown SMD Component
The usual search from s-manuals (https://www.s-manuals.com/smd/aa) didn't bring useful results.
The part looks like a low voltage op amp judging from the schematic. The right-hand side sub-circuit ...
- 17.4k
7
votes
Unknown SMD Component
This is roughly how that circuit can be re-drawn:
simulate this circuit – Schematic created using CircuitLab
And here is it re-drawn to be easier to follow:
simulate this circuit
6
votes
Accepted
KiCad leave room for optional through hole resistor on top of default SMD?
If you don't want to create a new footprint with duplicated pads, the easiest way is probably to put two resistors in parallel in your schematics. Assign one SMD and one THT footprint.
Then, stack ...
- 96
6
votes
Accepted
Can anyone identify this SMD?
Putting things into context, the circuit in the picture is about Ethernet interface.
The component CL2 has a connection to Ethernet socket metal shell. Thus it must be the common mode capacitor ...
- 89.6k
5
votes
Accepted
Why do I have shorts/bridges on QFN packages on PCBA during assembly? Stencil Printing problem
Solution:
I borrowed a new stencil printer and improved the process and I got proper results. I didnt need to change the stencil. Thank you for the tips.
These things must be done in my case:
Wipe/...
- 391
5
votes
Why does this 3V linear voltage regulator output 1.6V?
Something else downstream of the regulator is broken and shorted, or just consuming too much current.
The regulator can't provide enough current so the output voltage does not reach the intended value ...
- 89.6k
5
votes
D2PAK 2-pin NMOS?
The tab/pad is a pin. Same as pin 2 (the cut pin) Not your fault. Datasheet unclear. Can't know without experience. The tab is not always electrically connected though, especially if there is a ...
- 47.1k
5
votes
Accepted
Can you help identifying this SMD part?
It looks like an SMD fuse from Littelfuse.
If so, it will be rated for 12A since it is marked "X":
It should test as a complete short circuit if you use an ohmmeter on it.
How I found it:
...
- 58.4k
5
votes
Accepted
SMD, reflow or hot-air gun?
The advantage of a reflow oven is that it evenly heats everything in a controlled and automated way. Assuming the oven is well calibrated you can precisely reproduce the manufacturers reflow profile, ...
- 10.5k
5
votes
What kind of tactile switch is this?
The behavior is called "double action" by many manufacturers. A not uncommon feature.
The size and packaging and specifics of the connections will vary by manufacturer and model and thats a ...
- 71k
4
votes
Re-reflow SMT boards
Not really an answer to how to fix it, but you should be checking your contract with the manufacturer (or rather, you should have checked it before). This is their responsibility to fix (hopefully!), ...
- 7,299
4
votes
How to identify this SMD crystal oscillator or resonator?
As @Justme says, this is a ceramic resonator. You can use this circuit from a Murata datasheet to test the device and at determine the frequency:
Note that the chip must be a 74HCU04 (unbuffered ...
- 331k
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