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 ...
user avatar
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 ...
user avatar
  • 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, ...
user avatar
  • 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 ...
user avatar
  • 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): - ...
user avatar
  • 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 ...
user avatar
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'...
user avatar
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 ...
user avatar
  • 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:
user avatar
  • 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 &...
user avatar
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 ...
user avatar
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
user avatar
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.
user avatar
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 ...
user avatar
  • 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
user avatar
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 ...
user avatar
7 votes
Accepted

D2PAK 2-pin NMOS?

The tab is the drain terminal. Route the tab as best in your application.
user avatar
  • 89.6k
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 "...
user avatar
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 ...
user avatar
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
user avatar
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 ...
user avatar
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 ...
user avatar
  • 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/...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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: ...
user avatar
  • 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, ...
user avatar
  • 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 ...
user avatar
  • 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!), ...
user avatar
  • 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 ...
user avatar

Only top scored, non community-wiki answers of a minimum length are eligible