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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66 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
50 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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98 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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2answers
75 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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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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2answers
71 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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76 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
91 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
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 ...
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1answer
93 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 ...
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1answer
66 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
63 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
45 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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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-...
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1answer
80 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
58 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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2answers
126 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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41 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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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 ...
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144 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 ...
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1answer
55 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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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 ...
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3answers
161 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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3answers
63 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
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, ...
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3answers
94 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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3answers
122 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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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 ...
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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 ...
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1answer
50 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. ...
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1answer
41 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 ...
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36 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 ...
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1answer
96 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 ...
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3answers
170 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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1answer
91 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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2answers
118 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 ...
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1answer
74 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 ...
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1answer
145 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 ...
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2answers
81 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 ...
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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 ...
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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 ...
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2answers
127 views

How do I find a replacement for this SMD Zener diode?

I am attempting to repair a circuit board where this particular Zener Diode is fried. I have attempted to search for any references to Zener diodes that are marked 8•9 (and 6•8) without success. ...
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2answers
128 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 ...
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1answer
50 views

I need help identifying two passive SMD components from [ GoPro Hero+ ]

[ This is the bottom side of the GoPro PCB. I marked the components I need identifying. I assume they are either capacitors and/or resistors, but I need confirmation.
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2answers
70 views

What are these two smd components?

I fried these two components by plugging in the battery the wrong way. What are they? I read SMDs have an ID which helps identify them but since they are burned i cannot read the ID. If i replace them ...
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1answer
111 views

Re-soldering SMD with SMD rework station

I recently purchased a clone 858D SMD rework station and would like to get familiar with de-soldering and re-soldering SMD chips. I was able to de-solder fine, but when trying to re-solder I can't ...
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1answer
82 views

Need Help To Identify Attached SMD Component

I am trying to fix a RS485 circuit. There is 3-pin protection components on both A and B pins. The component is connected serially to the line and mid pin is grounded. There is no label on the ...
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1answer
72 views

SMD capacitor damaged - use of X2 class

I have a question about the need of the use of the X2 capacitor. I have a simple design which can be connected to AC line and I not use an X2 class capacitor but I m using an SMD capacitor from Murata ...
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0answers
46 views

Magnavox circuit board question

I have TV that just died. Magnavox 32ME402V/F7. Pretty sure it's a bad capacitor. I'm sure I found one that's bad using my ESR tester. But I have two questions. The one that's bad according to my ...