Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

1
vote
2answers
108 views

What's the name of smd buttons build of a simple thin metal sheet which flex when pressed?

As the topic title, I tried to find them but cannot get any informations about. They are a sort of SMD tact switch made only by a very thin curved metal sheet. When you press they flex and make ...
0
votes
2answers
24 views

Eagle - outlines/placeholder for smd (0603)

I'm a bit new in this area, trying to make a PCB for my little project and cannot find how to make placeholders for smd components in Eagle 9.2.2. Is it possible to have/create outlines for smd (...
0
votes
1answer
39 views

Calculating SMD resistor temperature rise

I am interested in knowing the actual power dissipation of an SMD resistor at a 70C ambient temperature. I am looking at a 10kOhm 2512 1Watt resitor RMCF2512JT10K0. from the electrical specifications ...
0
votes
1answer
47 views

Eagle - Custom pad shape for SMT inductor

I'm trying to make the following footprint in Eagle for an SMT inductor: I understood how to make D-shape pads and similar, but this is driving me nuts: my idea was to enclose a pad into a polygon ...
0
votes
0answers
48 views

What is the type of this fuse?

this is 160mA SMD fuse, what is the type of this fuse?
6
votes
1answer
1k views

Identify unknown SMD component code A6530 72130

I have a TTL to RS485 driver board and I am try identify one of the manufacturer part number from the board. Can anyone identify the SMD Code and manufacturer part number of the following device? ...
1
vote
1answer
51 views

SMD identification SOT23 “t” “7” symbol

I tried to identify the component marked with "t 30" the SOT23 package. I looked for the "t" of "7" symbol in this list and also tried smd marking search engine but couldn't find it.
2
votes
2answers
97 views

Troubleshooting defective LED bulbs

I bought 10 Thomas Watt LED bulbs and 8 are dead in less than a year (each last about 2-3 months). Soometimes a couple of days before they stop working, they flicker when I switch them on or after ...
0
votes
4answers
80 views

Attaching wires to a SMT footprint

I have a pre-made motor controller which I want to re-purpose for a hobby project by pulling the MCU off and attaching to a custom control circuit (with a more powerful MCU, current sensors, etc). The ...
0
votes
0answers
48 views

How to increase SMD codes readability

is there any substance to increase the SMD codes readability when the component is very small or has a poor print on it? Some years ago I saw a video where they suggest to use alchol, but I tried ...
0
votes
0answers
24 views

identify ic component - VL7TA

can you please help me to identify this IC? it could be a voltage regulator. it's marked as VL7TA, has 10 pins at the bottom. Please see the pictures below:
0
votes
0answers
41 views

Identifying surface mount components on a video card

I'm having difficulty identifying some surface mount components on a video card I'm attempting to repair (They have been knocked off). I have a working card which i can use as reference- attached ...
9
votes
7answers
2k views

How can the ACS712 pin handle 20 A?

I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
-2
votes
1answer
67 views

I have an SMD switch how can I find the part number?

I have an SMD switch but I don't know its part number. I searched suppliers sites like Digikey and ... but I couldn't find it. Is there any other way to find the part Number? The size is 6*6*5(...
0
votes
0answers
58 views

0402 SMD resistance shortcut [duplicate]

I am wiring a small plastic model with 11 yellow 3V 0402 LEDs. I used the resistance calculator to find I need as many 56ohm resisters attached to each LED in parallel to keep them running properly, ...
0
votes
1answer
46 views

How do i find Current Consumed by Circuit designed on Surface mount PCB without damaging PCB? [closed]

I have a circuit designed on PCB, and components (resistors, capacitors, diodes, Microcontrollers etc.) are all surface mount. I want to find the total current consumed by this circuit. I have traced ...
1
vote
2answers
458 views

What is the purpose of this extra PCB pad?

I am looking to use this crystal in an upcoming design and I am a little bit confused by the datasheet. The datasheet is available here: CMR200T Datasheet This is the image in question: Question: ...
7
votes
2answers
1k views

What is the effect that makes components on a circuit board move into place?

I am going to apologize ahead of time if this is a really simple question. I started learning to solder during my internship but I had no EE knowledge prior. When I was working with surface mount ...
-1
votes
1answer
127 views

Identify SMD component labelled W16 95

I'm trying to find out what element is the one that is on the PCB that is labeled as QD2. On the body it has mark W16 and 95, but I couldn't find anywhere on internet what this element is. This is ...
1
vote
3answers
67 views

Electrical isolation problems when routing between pads of SMT resistors/caps

According to answers to this previous question, routing traces between the pads of SMD caps/resistors, as shown in the picture, is not dangerous as long as trace to pad clearances are obeyed and the ...
1
vote
0answers
74 views

Can anyone please identify this 6 pin SMD integrated circuit?

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 a solar charger and I need to replace it.
1
vote
1answer
48 views

How would I determine the ideal capacitor for a specific application

I am attempting to replace a Surface Mounted Multilayer Ceramic Capacitor in an Amiga A4000 which is described in a BOM as: Capacitor, SM, MLC, NPO, 100pF (1206) ...
8
votes
1answer
124 views

I need help to identify this old SMD device

I'm working on a circuit and I can't find information on this component (see picture). This hybrid circuit is part of an old industrial PSU. It is a PFC circuit based on UC3854 but I don't know if the ...
0
votes
1answer
64 views

Does Solder paste file is necessary for through hole component as same as SMD or not?

I have designed a PCB and there are only through hole components in the top of my board and only some surface mount components in the bottom of the board. Now, I don't know exactly is TOP SOLDER ...
1
vote
0answers
30 views

Identifying 6 pin SMD 23ALB7

I need some help identifying these SMD . 23ALB7 with 6 pins. They are found on a laptop TOSHIBA SATELITE L650.
5
votes
1answer
683 views

Do SMD resistors have to be reflowed black side up, or is black side down okay?

I reflow my own boards in a toaster oven. When I drop my resistors off the paper tape, I always flip them over to black side up before I place them. Should I bother if it doesn't really matter?
-1
votes
0answers
29 views

SMD NP0 soft termination or SMD Film capacitor for SMPS filtering and AC switch loop

Hello I have a problem where I've to select a suitable decoupling/bypass capacitor for the AC-path for the switch noise for the 400V switching H-bridge where I need low height of components. Where the ...
0
votes
3answers
51 views

0402 SMD resistance problems

I've trying make a very simple 3 LED circuit with a red, blue and green LED. I know my 3v battery will take the path of least resistance and only flow through the red, so I've added resisters to the ...
0
votes
2answers
34 views

reflow oven issues with RO4003 PCB

Im trying to reflow some RF pcbs in a legit reflow oven. The PCBs material is "Rogers RO4003 305 Um" and 3 layer. (Its a very thin pcb) If temperature is high enough to reflow the paste, the pcb ...
0
votes
0answers
86 views

Can I use SMD components or do I have to stick to through hole?

I work in a company which develops devices that need to withstand harsh environmental conditions, shocks, radiations, vibrations and whatever. Really, too many to count. In one of those devices is a ...
2
votes
2answers
78 views

Usefull 0402 and 0603 solderbridge footprints compatible with machine manufacturing?

I am currently in process of my eagle library cleanup, and came up with the idea to create a footprint similar to the one from nucleo boards. Those pads are meant to be easily bridged by just solder ...
1
vote
1answer
54 views

Help identifying SMD on USB Circuit (Wacom Intuos 5 - PTH850)

My Wacom Intuos 5 - PTH850 Tablet have one the following SMDs (the lower one, USB Data -) cracked. Could you help me identifying which component is? I know each component bridges USB data + with ...
1
vote
1answer
60 views

How to properly connect SMD component to inner layer

I have a four layer board. The stack is divided as follows: Layer 1: Signal Layer 2: GND Layer 3: Power Layer 4: Signal I have SMD components such as an SMD fuse,...
0
votes
1answer
74 views

PCB Power Pad destroyed for TPS51125. Fixable?

While trying to fix a laptop, I was de-soldering a TPS51125. I added a bit too much solder to the power pad while wicking so I had the "smart" idea to use a solder pump to remove it... but the pad ...
0
votes
1answer
77 views

SMD component list for capacitor

Being newbie to electronics, I'm unsure which SMD component to choose. I'm trying to build a step down voltage circuit using AMS 1117 (5 v to 3.3 v). I want to know the SMD capacitor component (...
5
votes
1answer
159 views

Routing large RF trace to small SMD pad

I am designing an RF board in Altium where due to the dielectric selected and its thickness, the trace width for a 50 ohm characteristic impedance is thicker than some of the SMD component pads. What ...
2
votes
2answers
78 views

What wire to buy to extend the legs of SMD components?

I am attaching some neopixels to an art project. Rather than buy the breadboard style neopixel which is 4x as expensive, I am buying the SMD style and just soldering legs on. This worked well for a ...
0
votes
3answers
92 views

Makeshift SMT Station. Any suggestions? [closed]

I am trying to do some surface mount soldering for my project and have hit a few snags. My hot air gun works perfectly fine for most of the PCBs I am making but one type in particular is problematic....
2
votes
3answers
113 views

MOSFET gate resistance's power rating

I wanted to verify the following or get some helpful pointers. So, I have a gate driver which can supply a maximum current of 0.5A , and I am driving a MOSFET Vgs of 15V, based on these two ...
-1
votes
1answer
110 views

Component identfication for IC marked C50 23XH

The letters on the chip are: C50 23XH What is the producer of this chip? What is this IC?
5
votes
2answers
93 views

How to deal with unused components in pick-and-place file?

I intend to send a board to a PCB manufacturer and I am wondering how to mark unused components in the pick and place file. I'm using EAGLE and I saw that it includes all components in the file, but I ...
2
votes
1answer
85 views

What is the name of this part?

I thought it was called a "jog dial" but I can't any parts by that name. There are five pins on the back and one on each side. What is it called and how can I find a replacement? It is similar to ...
4
votes
3answers
173 views

The best way to attach a heatsink to a SMD component?

There's a SoC I want to throw a heatsink on. What's the best way to do this for maximum heat transfer and longevity? I know of thermal pads, thermal adhesive, and thermal paste -- but when it comes ...
0
votes
1answer
42 views

Is there a popular footprint for right angle SMT LEDs?

I am designing a PCB with SMT LEDs at the edges. The LEDs have to be right-angle type (ie. shine sideways). With regular LEDs I can use an 0805 or 0603 footprint and tell the assembly house to place ...
1
vote
3answers
193 views

Can I get away with that poorly designed board?

I am designing a board but space is not a luxury that I have at the moment, can I get away with that design or I must use a SMD resonator?
0
votes
0answers
19 views

Advice on connecting a Li-Po battery to SMD terminal?

I would like to connect a Li-Po battery pack with female PH connector such as the one shown below to a PCB which will use SMD devices. I have also provided the circuit diagram below and highlighted ...
0
votes
1answer
66 views

Tolerance on SMD Aluminum Electrolytic Capacitors

I'm searching for some polarized surface mount device capacitors on lcsc.com and notice that they only have tolerances of \$20\%\$ tolerance devices in their catalog for this type of SMD device ...
1
vote
1answer
115 views

Component identification (SMD)

Help me identify this component: test results identify it as a diode. I believe the manufacturer is Vishay, but I can't find anything when I search for it. There is a label placed on the component: "....
10
votes
2answers
944 views

MLCC - Can I use high voltage rated caps for very low voltage scenarios?

Is there any important reason why I can`t use high voltage mulilayer ceramic capacitors for low voltage scenarios? For example 50V or 100V rated MLCCs for 3.3V DC applications? I have bad eyes, and ...
0
votes
1answer
72 views

What ceramic capacitor is this?

I'm almost sure this is a ceramic capacitor, but I have trouble finding its characteristics. The first picture is the top side, the second the bottom side. The first shows: 120G (or 12OG) and an F. ...