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.

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10
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1answer
1k views

Which is better - components on both sides or components on one side of the PCB?

I am working on a PCB design. 50k PCBs will be produced. SMD components: 100 Through-hole components: 25 I need to minimize PCB size. There are no high-speed signals or sensitive signals in the ...
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2answers
107 views

Where can I look for USB 3.x superspeed mux chips for poor people that only have through-hole soldering tools?

I'm new to this realm of purchasing and I'm not exactly sure which of the different package names (SSOP, VQFN, etc.) are more friendly than others for basic through-hole soldering. I would also be ...
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1answer
98 views

Please identify this 6-pin SMD marked AI531

It is a 6-pin SMD from 1.6W blue laser driver The code on the case is AI531 Please help to identify this SMD. https://tr.aliexpress.com/item/33045090236.html?spm=a2g0n.shopcart-amp.item.33045090236 ...
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3answers
121 views

Are 1uF NP0/C0G capacitors different than regular 1uF capacitors?

I am reviewing an schematic and it contains several reference to 1uF 0402 SMD capacitors, some of them are marked simply as "1uF" and others as "1u, NP0/C0G" , I think both are the same, is there any ...
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1answer
603 views

How to find SMD transistors library for Altium Designer?

I am new in PCB design, so excuse me if this is a bad question! I know the basic electronics and how to draw schematics in Altium. But about SMD parts, I am a little confused! How can I find SMD ...
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1answer
64 views

Should I apply soldermask over SMT thermal pads?

On page 8 and 9 of the following datasheet, there's a description of thermal pads for this MOSFET: https://www.vishay.com/docs/63302/si2342ds.pdf What I am wondering is: I will design the footprint ...
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1answer
156 views

How to find replacement LED for TV backlight

My TV has a damaged LED in its backlight. The LED had started flickering like 2 weeks ago and finally the whole backlight stopped working. Nothing obviously unusual on the LED driver board, the MOSFET ...
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2answers
105 views

Antenna Impedance Matching, 0 Ohm Response

I'm currently trying to match some SMD antenna breakout boards. These boards have one type of SMD antenna, footprints for an SMD pi network and a 50 Ohm cable as connection to my VNA. Now the problem ...
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1answer
55 views

How to change the led on this board to a brighter led? 12v input

Needed to change these led to brighter led. Is it possible? If yes then how can it be done? Noobie!!
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2answers
1k views

How to assemble PCBs when SMT machine doesn't have enough feeders?

I just got access to an SMT machine in a DIY fablab. I have a board that has about 50 unique components that I wish to assemble and test drive this new machine. I intend to make 20 of these boards. ...
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1answer
113 views

What is this component, labelled as “RT” on the PCB?

Can someone tell me the name of the below component? It is labelled as RT on the PCB:
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3answers
294 views

Component identification (SMD) - Beelink X55 Ultimate

Recently my NUC has decided to release some magic smoke. I found two problematic components in it. F1 fuse, which failed (?) to protect the board and U10 which has manifested a nice eruption point. ...
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2answers
721 views

PCB component with abbreviation SR1

I have a laptop battery pack with a fried component (visually fried) that has the appearance of a large surface mount resistor (only 2 connectors). It has the PCB abbreviation next to it of "SR1" ...
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2answers
80 views

If I have two aligned PCBs with pads touching each other, will they bind if I reflow them?

I have a design where two boards of the same size will be stacked like pancakes and physically touching. I want to electrically connect them, and I thought of just adding matching solder pads and ...
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2answers
73 views

SMD Electronics Part that could be used for hanging

I'm working on a decorative PCB and I want the ability to hang it up on a wall conveniently. I was trying to think of something that would work similar to the saw tooth looking piece in this example ...
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0answers
98 views

SMD LED without soldering

I am working in a project at the university and we need to test (electrically and optically) several different SMD LEDs. The idea is to use or create a socket able to connect the terminals of the LEDs ...
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4answers
3k views

SMD ceramic capacitor 0805 vs 1206

I don't know what size to choose. Does SMD capacitor package matter in my case, Is it wrong to choose 0805 package?
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2answers
95 views

Why would this power mosfet be made in a surface mount package?

I’m looking at the CSD17303Q5 power mosfet which boasts a 100A max drain current. It confuses me why they have it in a VSON surface mount package because most pcbs would not be able to handle that ...
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1answer
28 views

Pad disconnected from smd chip

I was trying to breadboard a circuit using 3-D antenna chip. I didn't have pcb board ready for it so I tried to solder jumper wires on the pads and then test the circuit by breadboarding. After ...
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2answers
276 views

SMD SOT89 identification

I am trying to Identify this SMD component, Pin 1 GND , 2-VCC, 3-? Out I can identify top letter is C , Bottom is G11, I think it might be a transistor but it odd being connected to the main power ...
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1answer
172 views

Should thermal pads be connected to GND or not?

I'm creating a footprint for the TPS2141 (LDO and current limiter) and I wonder if the thermal pad should be connected to the GND plane or if thats a bad idea? Should it just have its own copper zone ...
4
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1answer
99 views

How to solder large smd components on a PCB with 2oz copper

I’ve got a large inductor that needs to be soldered to my board. The pads are hidden underneath the component so hand soldering is not an option. The data sheet says to reflow at 260c for 40 seconds ...
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1answer
101 views

What is this SOT-89 component marked 43B H42?

Can anyone help me identify the SOT-89 component in the picture below? It is marked \$\text{43B H42}\$. I have searched to find anything resembling a match, and I found that it could be both a ...
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2answers
143 views

Finding solder pad sizes for capacitors / resistors based on density level

I found out that there are differences in the sizes of soldering pads for SMD components depending on the required reliability and available space. For resistors (805) I found good sizes (datasheet ...
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2answers
425 views

Reflow Soldering at home

I’m trying to solder my TSSOP-16 chip to the DIP adapter. I’m planning to apply solder paste to the adapter’s pads, put the chip on the adapter and then use my kitchen oven to melt solder paste and ...
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3answers
277 views

Need help identifying burnt SMD

Help me identify the burnt out SMD located on M801 position in the attached photographs. It belongs to a Philips Bodygroom BG2024/15 PCB. I intended to replace the two rechargeable batteries, but ...
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1answer
68 views

What parts to really keep out of antennas keep-out box, and which not so much?

I'm in the process of designing a pcb for a very small IoT device and need to get it as compact as possible. I'm currently considering these two smd antennas: https://www.molex.com/pdm_docs/as/AS-...
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1answer
193 views

PCB Pads vs Components Footprints in PCB design

I want to understand the process of PCB design using a software like Altium. I have come across two approaches as follows: Approach 1: While making the component parts library we make the footprints ...
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1answer
69 views

how to know the rotation direction and pin order When manufacturer is doing SMT

I want to know about the SMT requirement documents. what I mean is that when I make a partlist and XY-coordination data from PCB software. that shows me rotation angle like R90 or MR270 I know that ...
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0answers
88 views

SMD jumper design rules

The SMD jumper. One of the most basic devices on any board using SMD technology. Yet, considering devices from various sources and looking into the hints of designing it, I get differing techniques ...
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1answer
2k 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.
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1answer
109 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.
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0answers
50 views

Parallel LTC3127 based software controlled supercapacitor charger

I am trying to charge 3 supercapacitors rated for 2.7VDC-300F connected in parallel, giving a total of 900F@2.7V. The IC I am trying to use is the LTC3127 from Analog Devices(Linear Technologies). I ...
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1answer
74 views

PWM to analog voltage conversion for communication between two microcontrollers

I want to use this schematic for sending PWM signals from an STM32F0 Arm microcontroller to an ATtiny85. I want to convert the PWM signal to a proper analog voltage, so that the ATtiny analogRead() ...
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0answers
35 views

Is this circuit ok for MCP9700 temp sensor?

I am trying to use multiple MCP9700 temperature sensors and probe certain power IC heatsinks for sensing the temperature through an attiny85. I have two parts in the overall schematic. For each ...
4
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5answers
8k views

Using a home oven for solder paste

I'm doing a project and I have a PCB which needs surface mount components attaching to it. One component has already been attached, and I have some 138deg solder paste in a syringe. This is possibly ...
1
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3answers
77 views

Need positioning arms for soldering 0201 [closed]

I'm looking for some kind of micro positioning arm to help me solder wires on tiny SMD devices. Some kind of pantograph mechanism where my hands move much further than the tip controlling the wire. ...
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2answers
63 views

drilling SMT footprints for fitting THT parts

I have bought by mistake some THT caps instead of SMD and would like to use them still. They were bought from a supplier who has the bad habit of not answering customer requests. These are 5000h caps, ...
2
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3answers
173 views

Via in pad, reflow soldering problem

Recently I've designed a PCB for the ESP8266EX-chip. With my amount of knowledge, I thought it would be smart to stitch vias into pads. To be specific, not only the ground pad of the chip, but also ...
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0answers
52 views

LED Board Driver Calculation [duplicate]

If there is a Board that has 100 LED diodes however using different Diodes that have Different specs (Maximum Reverse Voltage, Max Wattage, Maximum drive current etc.) similar to a Quantum Board LED ...
2
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3answers
250 views

Heatsink on top of SMD plastic IC or bottom of PCB?

I often do designing power modules and always wonder if there is some kind of rule how to properly cool SMD devices. I always look at final products from other companies and some are placing heatsink ...
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2answers
78 views

Need help identifying and finding similar SMD variable resistor

The component appears to be damaged, but the datasheet for the board in question shows that this is a 47k ohm variable resistor. Looks like a trimmer, but not 100% sure. However, I've been trying to ...
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1answer
80 views

How to physically connect AS3933 to 3D antenna?

I'm trying to breadboard LF frequency receiver circuit using AS3933 receiver chip IC and CAS143-147 3D antenna chip. However I don’t understand how can I connect AS3933 pins to CAS143 on a breadboard. ...
2
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1answer
77 views

Eyelet replacement trace repair?

I'm new to electronics, I was working on a surface mount board and I desoldered one of the eyelets a bit too much and burnt its trace as well. What steps should I take to repairing this? I'm not ...
15
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5answers
2k views

SMD IC mounted upside-down inside a drill hole for extreme low-profile requirements

I don't know if the title is descriptive enough, but I came across this PCB and could stop to wonder about its brilliant design. It is an aftermarket trigger controller for an airsoft gun that works ...
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2answers
804 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
5
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1answer
269 views

How to identify SMD device marked LEFBV?

I have a SOT23-3 component marked \$\underline{\textrm{L}}\,\underline{\textrm{E}}\,\overline{\textrm{F}}\,\overline{\textrm{B}}\,\textrm{V}\$ as shown in the following images: The following ...
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2answers
140 views

Identifying this SMD capacitor

I would like to ask you for help with identify one capacitor at photo below (can't find it). I got GTX 1080 Ti to my hand with torn out capacitor on VRM. I am looking for the identical one. Can any ...
2
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1answer
120 views

Need help identifying SMD component

This is a board from a Johnny Lightning V-bot, it has these SMD 6 pin components that just have a M03 and a dot on one of the terminals. Does anyone have a datasheet or any idea on how to ask for one ...
2
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1answer
100 views

Does anyone know what this smd chip is?

I have some PCB and on it this chip. I'm trying to figure out what it is. I've searched all over the google, SMD codebooks, datasheet websites and I haven't even found a similar thing

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