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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43 views

Placement of two independent crystals

This one is completely about PCB layout. I have two 26MHz crystals in the design, one for each processor on the board (TXC 7M-26.000MEEQ-T, datasheet: ...
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29 views

Surface-Mount Prototyping (AXL 335 & SFH 7050)

I'm working on a senior project and I'm having some trouble prototyping with surface mount components. I know you can find SMT adapters out there for most SMT chips and components, but I've been ...
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1answer
45 views

Automate Noise Sensitive Designs of SMD For 95% Sensitivity [on hold]

I am thinking of automating my noise sensitive designs of high sensitivity in SMD: maintain 95% signal sensitivity by adjusting the factors (1-3) in the thread What is the best way to layout a PCB ...
0
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1answer
29 views

Difference between ADUM6403 and ADUM6403ARIZ?

I bought ADUM6403ARIZ and I am thinking how it might fit ADUM6403. I am thinking the differences between the two chips ADUM6403 ADUM6403ARIZ ADUM6400ARIZ should be equivalent to ADUM6403, but not ...
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2answers
127 views

100nF MLCC bypass capacitor spontaneously exploding on 3.3V bus, how does this even happen?

A 1608/0603 multilayer ceramic chip capacitor was functioning as a bypass capacitor for the 3.3V supply of a InvenSense MPU-6050 6 axis (gyro + accelerometer) MEMS sensor. It somehow exploded forming ...
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1answer
58 views

Desoldering a TO-220 MOSFET from a plated through-hole board with SMD complications

I'm planning on replacing a TO-220F package MOSFET on a through-hole circuit board that also has SMD components on it. In this case, an SMD capacitor is connected to the source gate of the MOSFET by ...
1
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1answer
91 views

Change only one side the roundness in SMD

I'm doing my own component in Eagle for a PCB design. This is the footprint that the manufacturer gives: But I have a problem with the SMD roundness when I try to draw the SMD footprint at the ...
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1answer
82 views

Can anyone indetify this SMD component?

This is from N9005 phone and i would love to know what SMD component is this. Here is a photo. Thank]1
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3answers
178 views

Preparing solder paste for syringe-style dispenser

I've been hand soldering SMD components for years and recently decided to buy a cheap solder paste dispenser hooked up to an air compressor. One of these with a 30cc syringe: I don't know much ...
3
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1answer
60 views

How do you test SMD ICs that are not soldered to a PCB?

To be more specific, let's say I have SOP16 SMD chips that have been purchased from overseas. I have several PCBs that they need to be soldered to, but I don't want to risk paying for assembly and ...
0
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1answer
56 views

Burning bootloader on atmega1284 tqfp

Is the process of burning a bootloader (JChristensen's mighty-1284 to be precise), on an Atmega1284 microcontroller same for both DIP (Atmega1284p) and tqfp (Atmega1284-au)? While searching online ...
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1answer
78 views

Possible to identify burnt component and its value?

The device is a Banana Pi M3, I accidentally short it out when I was playing around with my multimeter on the GPIO pins.... A noticeable spark came from that component in the above picture circled in ...
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2answers
151 views

Are SMD microcontrollers less affected by noise than DIPs?

Are SMD packages of microcontrollers (to be more exact : AVR mega series) less affected by noise rather than DIP packages? Or the opposite is true? By noise I mean anything that can disrupt the ...
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2answers
143 views

Is there any reason to prefer one MLCC manufacturer over another?

I'm specifying some SMD chip capacitors for the first time and I note there are several manufacturers out there: muRata, Yageo, Vishay, AVX, Kemet in particular, perhaps others. Is there any good ...
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1answer
453 views

Why put vias underneath an IC?

Several designs I've seen have a load of vias underneath high frequency or analog ICs. For instance, this is a part of a PCB design for a DDS unit: Design from http://rudius.net/oz2m/ngnb/dds.htm ...
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0answers
58 views

6-Pin SMD Identifier Help

I need help identifying this SMD please. Markings say 326X and goes to a Kortek AD Board Lotus for 22" LCD KT-LS221DCS-23. Any help would be appreciated. Thank you!
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3answers
95 views

Question after my first attempt with reflow soldering

I have a couple of questions, plus I'd invite any comments/feedback/suggestions to improve my results. I used solder paste Chipquik SMD291AX10 (Sn 63 / Pb 37) on the pads and also flux (Chipquik ...
0
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1answer
72 views

Simple parallel SMD LED circuit(need help)

I'm going to make some LED circuits, but I'm not sure if it will work. The problem is that I want to use Red and Blue leds, but they have different drop voltage. Will this circuit work?
3
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1answer
85 views

Do all/most SOIC chips whitstand the 235 degrees C for reflow soldering?

I want to try reflow soldering for several projects (small scale). For some of the components (e.g., resistors and ceramic capacitors), the datasheet does give specific information about maximum ...
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3answers
107 views

Best Way to Solder/Desolder Surface Mount Components

I recently got my hands on some old motherboards/PCB's, and even though I know reusing parts from old PCB's is not as good as using new parts, I was wondering what the best way is to solder/Desolder ...
9
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1answer
260 views

What is a good methodology to identify small SMD components?

Having been in the position of trying to identify a strip of mystery 0603 components I found on my floor, I thought a good general question to pose to this community might be what a recommended set of ...
3
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1answer
51 views

Missing pad tCream

I've just finished my first component footprint and then I figured out that there is a pad without tCream, which I guess it is generated automatically. What could be went wrong? By the way, does it ...
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1answer
63 views

Help Identifying this chip (ATH342)

Fairly simple, I have a small 8pin chip on a board, and I have no idea what its doing, and cant find any information about it online. There are no manufacturer logos on it, and the serial number ...
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1answer
100 views

How to mount an OLGA package IC for development

I need to mount an IC with an OLGA package in a protoboard or wirewrapping board for development. There is no development kit in the manufacturer's website for this IC, so all I have is two samples of ...
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2answers
50 views

Peak Voltage Ratings of SMD Inductors

Off the shelf SMD Ferrite coils are widely available and popular .The power ratings are adequate for many applications.The manufacturers are clear about the current ratings for saturation and copper ...
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1answer
176 views

Cooling for D2PAK dissipating 30W?

I'm designing a board with some MOSFETs that dissipate a fair amount of power. The best device (low Rds and low Qg) available in this scenario would run at 30W max. This is available in D2PAK and ...
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88 views

Removing SMD connector from PCB

I have a old PCB board and there are some connectors on it that I would like to use again. Is there any possible method to remove the connector with plastic parts (say molex 53398-0271) without ...
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2answers
65 views

Should I design a high-power switched mode power supply with surface mount components?

I'm designing a SMPS for a fairly high-power application (2kW, 50A). In looking at the available components, sometimes almost the exact same components are available in surface-mount and through hole ...
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3answers
102 views

Is there such a thing as a multimeter with needle prongs as small as an exacto knife tip? [closed]

im working with repairing cell phones and I need to test connectivity, but the multi-meters that i have too big of a tip. are there micro tip multi-meters for precision use on tiny chips as small as ...
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1answer
137 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
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4answers
653 views

Jumper or resistor?

I have in my BOM (Bill of materials) the following component CR21- 000-T and in the datasheet of the component : CR, CJ series is specified CR21 series as 0805 resistor. But the 000 is specified as ...
3
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3answers
265 views

Tape and reel - using components OK?

If I buy a full reel of components (let's say resistors) with the intention of sending it to an assembler later so they can assemble my product, is it OK to use components from the reel when I'm ...
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1answer
58 views

SOJ socket to PCB

I was wandering, is there some socket for ICs (memory) with SOJ packaging? I mean one that would have contacts that could go through PCB. Like some hybrid between SOJ socket SMT and DIP socket. Or can ...
3
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1answer
336 views

Can massive ammounts of 0603 SMD 1uF ceramics displace power caps?

Edit:Warning: there's an error in one of my assumptions in this question, which more or less invalidates it. See Tom Carpenters answer. I'1m designing a switched mode power supply, and of course need ...
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1answer
112 views

What SMDs are these? [closed]

Just a quick question: Does anyone know what SMD are these?
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1answer
182 views

SMD diode value [closed]

I need to change surface-mount diode but i need to know its value. possible your assistance to know the value of the diode in the picture. what is the value of diode in picture? or how to get the ...
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1answer
173 views

Can I Reverse/upside-down mount SMD LED

I've seen reverse-mount LEDs which are meant to have the light shine through a hole in the PCB, instead of straight off. Is it possible to just add a drill hole for normal LEDs and just place them ...
0
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1answer
183 views

How to identify SMD devices from the codes on top of the component?

I have a PCB and I am trying to identify a couple of the ICs and other SMD devices that are on there but can't find anything on or offline that tells me what the package codings mean. I have a couple ...
0
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1answer
186 views

Replacing a SMD inductor, alternatives?

Trying to fix a board that had a SMD inductor. it was labeled L1 on the silk and there was no marking on the part, and I have no schematics. ...or there may have been markings, but someone tried to ...
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4answers
72 views

Temporary SMD Adhesives? [duplicate]

When I do prototyping I solder my PCBs by hand. That works fine most of the time, but I run into a problem when I have to solder chips with fine pitch (Google for VQ100 to get an idea of what I'm ...
4
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3answers
453 views

Looking for capacitance and voltage rating - How to read electrolytic SMD capacitor labels

I need to replace an SMD capacitor on a board. The printing on it says F1 560 2.5z I have googled intensely but have been unable to find information on how to read such a codes. I need to find out ...
2
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2answers
355 views

Mount SMD component raised 45 degree from board

My challenge is, how can mount a SMD component in a 45 degree angle raised from the PCB. I am doing a temperature sensing device, which is intended to be mounted on a wall, hence the PCB will be ...
4
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4answers
390 views

“Upside-Down” SMD LED

The light would shine down towards the board instead of up and away from it. This would be useful where for example the board is being used as some sort of capacitative touch pad with LED indicators. ...
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3answers
556 views

Making prototypes with high speed SMD components

Even today we have breadboard and strip board on which one can make "quick and dirty" circuits and also test prototypes. However, we have now moved into an era of predominantly surface mount ...
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1answer
181 views

stm32f4 HSE crystal

I'm trying to set up an HSE for my STM32f4, using this crystal. but there are 2 pins : OSC_IN and OSC_OUT, but my crystal only has one output. So what do I link OSC_IN and OUT to ?
0
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2answers
170 views

smd resistor and regular through hole resistor

My question is fairly simple. I am building an SMD LED board and i am limited in space. So originally i was planning on going with through hole resistors, but have it being i'm very limited on space ...
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3answers
773 views

Can I use thermal paste instead of solder for a SMD heat sink?

I have some high-power (~5W) SMD LEDs that I will be running for extended periods of time. I would like to use a PCB mill to make breakout boards for these chips for easy prototyping. Ideally I would ...
0
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1answer
155 views

Will an 0603 capacitor fit on an 0805 pad?

I am in a pinch and just submit my final board design to a pcb house. Unfortunately, I messed up the design and had an 0805 pad in a spot where a an 0603 should have been. I will be getting the boards ...
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2answers
151 views

list of general purpose smd transistors, diodes and mosfets [closed]

I want to start with building up a little stock of smd components. But i'm not sure where to start. Is there a list of general purpose smd Transistors, Diodes and (mos)fets? Thnx in advance
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259 views

Using a mixed technology, SMD and THT components in one PCB

I want change design from Through-hole technology to SMD design. Some components have no SMD version, for example some transistors in TO-92 package, and Power Mosfets, which available in DPAK SMD ...