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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7030 SMD LED pad configuration

I have not done a lot of work with SMD LEDs and have a question about the pad layout. I have done quite a bit of research and haven't found much helpful info yet. I am working with 7030 SMD LEDs ...
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348 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 ...
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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 ...
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94 views

What LED PWM controller has marking AT508CS?

I have an LED worklight with low- and strobe-functions. One click: On - full Power Two clicks: half Power Three clicks: strobe Four clicks: Off The controller is circled: No markings on the top ...
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255 views

Different balun configurations

I am looking for a balun to be used as a single-ended to differential converter, 1:2 impedance ratio, including range 1.5-2.5GHz, SMT and phase balance as good as possible (and return loss). Center ...
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136 views

I'm trying to identify this SMD

I'm trying to repair Black and Decker Thermal Leak Detector. I was testing the 9v input from the battery when I notices the chip was cracked. I'm thinking it is a transistor, but I haven't been able ...
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113 views

Potting a board with SMTs

I am trying to find the correct potting compound for a device that will sit on top of lead acid batteries. It will have SMTs, and we would like it to tolerate temperatures as low as -40. Because of ...
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71 views

How much of a surface mount PIN diode is semiconductor?

The problem: manufacturers provide a lot of information on the operation and characteristics of the devices, but not on what's inside. I'm trying to incorporate the effects of a surface mount PIN ...
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1answer
82 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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32 views

how fine is fine pitch technology in SMT - is it still below 0.635mm (25mils)?

with lots of components going much smaller these days, is there any amendment in IPC for the definition of Fine Pitch Technology for SMT?
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4answers
174 views

How to connect multiple 0402 leds to an Arduino for a 1:87 model

I want to replicate lighting a 1:87 scale police car with the aid of an Arduino Pro Micro ATmega32U4 powered by a 90mAh 3.7V LiPo which is connected to a TP4056 5V Lipo battery charger which is ...
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179 views

Self Resonant Frequency VS Package Size for capacitor

In general belief, smaller capacitors have better charactristic(more capacitive behaviour) in high frequency than bulky capacitors. On contrary in one of my RF project (8.5GHz - 9.5GHz) when checking ...
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105 views

Mystery component

I have this SMD component that popped. I cant seem to identify it properly. Could you please help? I tried to look it up, but had no luck. It is a led driver board.
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330 views

Identifying a SMD component

I have problem with identifying a SMD component. This component is a part of automotive module. It has 2 pins. One of the pins is attached to Vcc 12 V, and the other is attached to the circuit ...
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252 views

Thru-Hole Works, SMD Does not

I have been working on migrating a through-hole circuit design that works to a surface mount version. It is a preamp designed by an engineer named Ritter. Here is his schematic: www.ciphersbyritter....
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1answer
157 views

RF limiter for -20dbm

I am working on a receiver in which I would like to limit the RF power at input to -10dBm to -20dBm, the receiver is working for frequency 1GHz. I Have checked pin diode limiters and shottkey diode ...
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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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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 ...
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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 ...
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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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75 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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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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34 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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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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67 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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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 ...
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57 views

Smd Component identification

I was creating schematic from a pcb but could not understand what the component in the image is for. The name written on the component is L386. At first i thought that it is a voltage regulator like ...
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35 views

help identify the SMD AK1629

Failed DVR Suspect that burned down this detail:prozvanivatsya short circuit in both sides can't understand which part to replace?
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43 views

Figuring out Inductance

I am trying to figure out the Inductance used on this PCB. I know it's value but need to understand what type of inductor it is and other things so I can order it. The code on it ...
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1answer
61 views

Board soldered airtight capsule

Mechanical Engineer here, not an EE. I have some environmental sensors that need to be a part of a flow path. It occurred to me that it might be possible to have a metal "can" that sealed to the ...
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1answer
71 views

30 Meter in series LED SMD 5050 60 led/m 12v RGBW

I want to run 30 meter Led length in series in a room on the ceiling. LED specifications (according to the supplier:) LED Type: 5050 RGBW LED Light Strip Quantity: 60 LEDs / Meter Working Input ...
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66 views

Move part to bottom layer without mirroring in Eagle

How can I move a SMD part in Eagle to the bottom layer without using mirror? The resulting PCB should have the SMD pads on the bottom layer but mirrored (if you turn the PCB and look on it from top ...
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68 views

1st KiCad design. Concerns with an abnormal circuit

I just wanted some input before sending this off for manufacture. It is for a test fixture and just has a funny circuit. Even though it seems relatively straight forward, it took a bit of finagling. ...
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78 views

Need help decoding part number for SOT23-5 chip

I have a circuit board that has come out of a smart plug-in lamp dimmer/switch module. I would like to find the part number of a small SOT23-5 integrated circuit chip that is on this board. The SMT ...
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29 views

Replacement of DMP2215L P-Channel MOSFET with AO3401 from Alpha & Omega

I want to replace a faulty Diodes DMP2215L SOT23 p-channel MOSFET https://www.diodes.com/assets/Datasheets/ds31125.pdf with the p-channel AO3401 MOSFET from Alpha & Omega http://www.aosmd.com/pdfs/...
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30 views

Antenna formed from the RF module shielding wall and cover

Can anyone provide details how an antenna can be designed from RF module shielding wall or cover? More specifically if any company is making this kind of antenna product for general communication or ...
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43 views

SMD Detector Microswitch Replacement

One of my son's toys stopped working and I decided to jump in to see what was causing the problem. I found that a number of the smaller detector microswitches had their tabs broken off. Therefore ...
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2answers
77 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 (...
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55 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 ...
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91 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 ...
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1answer
253 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 (...
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1answer
48 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 ...
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67 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 ...
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111 views

Assemble a 9 * 9 * 0.05 mm steel foil and castellation PCB using standard pick and place

I have a hybrid PCB where I want to assemble a very thin steel foil on a PCB using standard pick and place SMT process. the picture below describe how the foil is like: The orange area is only hold ...
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1answer
44 views

What is this UP 4B2 smd chip in dfn8 case?

Acts probably as a driver to power the motor. There a two of this kind on the board. One burned, the train drives only in one direction.
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376 views

TRRS 3.5 mm Audio Plug (male) into a printed circuit board

Have a device I'd like to plug into a headphone jack of a cell phone. Wanted to start making some more professional prototypes; print my first circuit boards, etc. I'd like to be able to implement a ...
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1answer
523 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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52 views

Transmitter design methods using 0201 SMD

I have some experience designing an IOT transmitter (315MHz/345MHz/433MHz) using 0603 SMD parts, but am considering building a transmitter for production using 0201 parts. My question is, what is a ...
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148 views

soldering 5x5x1 high power SMD LED: anode, heatsink, cathode

I've got myself a high power SMD 850 nm LED, 650 mW radiant power. I need to use this non-stop for hours at a time. So I need to solder this to a heatsink to manage the heat. I've got 4 them, actually ...
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207 views

Help decoding resonator/oscillator marking

I'm looking at a PCB for a car remote (either 314.xx or 433.xx MHz), and the resonator or oscillator (SMD, crystal? ceramic?, Japanese?) has following markings: ...