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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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3
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2answers
159 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?
1
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2answers
77 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 ...
-1
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1answer
23 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 ...
0
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2answers
208 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 ...
0
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1answer
91 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
62 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 ...
2
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2answers
165 views

SMD desoldering - struggling to get this chip quik stuff working, what am I doing wrong?

So I have to replace a SMD connector, and although i do have soldering experience, it's all with THT. I watched like 10 different YouTube videos on chip quik, and they all made it look so easy, so i ...
0
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1answer
61 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 ...
0
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2answers
40 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 ...
0
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1answer
256 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 (...
0
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2answers
119 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 ...
3
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3answers
154 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 ...
0
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3answers
142 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. ...
0
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1answer
65 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-...
0
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1answer
68 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 ...
0
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1answer
57 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 ...
0
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0answers
39 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 ...
1
vote
1answer
716 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.
3
votes
2answers
350 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
78 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.
0
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0answers
46 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 ...
0
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0answers
78 views

What is this SMD for on a SZBK07?

I purchased a SZBK07 CCCV Step Down Buck Converter and I was hoping to remove the TRIMPOT and replace with a potentiometer how ever there was a Orange SMD thing bridged between the 2 and 1 pin's on ...
1
vote
1answer
54 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() ...
0
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0answers
27 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
6k 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
62 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. ...
0
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2answers
52 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
votes
3answers
89 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 ...
0
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0answers
47 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
votes
3answers
114 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 ...
0
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2answers
69 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 ...
0
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1answer
49 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
votes
1answer
39 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
votes
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 ...
7
votes
2answers
705 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 ...
0
votes
0answers
35 views

EAGLE SMD Overlap

I have created a footprint for an SMA-Connector like this: The footprint looks like this: There are 3 SMD-Pads on the Bottom Layer and 2 SMD-Pads on the Top. The SMDs on the outside overlap with ...
5
votes
1answer
235 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 ...
0
votes
2answers
126 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
votes
1answer
93 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
votes
1answer
89 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
2
votes
3answers
264 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 0.5 A , and I am driving a MOSFET Vgs of 15 V, based on these two ...
0
votes
1answer
525 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 ...
2
votes
2answers
115 views

Have SO(P)X components 2.54mm, 1.27mm or smaller pin spacings?

I'm a bit confused about the pin spacings of SO8/SOP8. Example: in Detail 2.54 SOP8, pin spacing is 2.54mm. However, according to Small_Outline_Integrated_Circuit, fragment: Small-outline package ...
1
vote
1answer
880 views

How to decode the markings on an SMD choke?

I have a broken Ravensburger Tiptoi pen for kids. I opened it and the choke L7 broke. It is SMD and marked 420. I found out that this could be either 42 micro or nano Henries. Question is, which is it,...
35
votes
1answer
57k views

How do I identify SMD components? (or how do I identify any component)

How do I identify the markings on an SMT component and match it up with a part number so I can be a good designer and actually look at a datasheet (and read the whole thing)? Or identify a part to ...
1
vote
1answer
73 views

Damaged Connector Identification

This connector got damaged while repairing a device, and I've been unable to identify it to replace it. The connector is SMD mounted with the circuit board underneath based on the image above. It is ...
1
vote
1answer
142 views

Any way to surface mounting a through-hole resistor?

I need to solder a 2W through-hole Resistor on one side of pcb, mean like smd component but this is for through-hole resistor. I google and found there is a way call ...
0
votes
0answers
33 views

SMT marking code 81TI and TI8A

I'm not able to find device based on marking code. I search in google, distributors and manufacturers site without success. Please help to identify it. They are in 2 different, but similar dimmer ...
0
votes
2answers
76 views

How to interface with SMD pads to a custom MCU on PCB

I have a board that I want to remove the existing microcontroller and apply my own. I'll be swapping out one brand of microcontroller and putting in something completely different and so I intend to ...
1
vote
1answer
75 views

I need help to identify a SMD component

I want to identify a SMD component of a Nubia Z9 MAX board (NX512JMB) In the next picture you can see the red square. A 4 PIN SMD component (or 2 PIN component, I don't know). The green square I ...