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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121 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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1answer
236 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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127 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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337 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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140 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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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
191 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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26 views

Practical Issues with Surface Mount Heatsinks?

I'm considering using surface mount heat sinks for D2PAK devices on a PCB. These heat sinks are bent sheet metal frames with tin/lead plating in tape/reel packaging which are suitable for soldering ...
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60 views

SMD oscillator and decoupling caps placement/routing

I want to design a four-layer board with a PIC32MM0256GPM048T microcontroller. All components must be on the top of the board. I tried routing OSC1 (osc in) and OSC2 (osc out) lines, and placing the ...
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80 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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4answers
223 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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203 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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365 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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257 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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37 views

Solder QFN88 by Hand

I just received my newest board i've designed and wanted to solder the first prototype. One of my Chips has a QFN88 Footprint. I'm quite experienced, but i just couldn't do it. Because of the small ...
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70 views

Trying to identify SMD with morse coded? markings

New here and first question: Any idea what this component is and it's specs? Markings look like morse code which reads "XTK" and what looks like .A. It is part of a circuit for LED, back lit, press ...
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24 views

Antenna impedance matching within metallic enclosures

What im trying to achieve is kind of an chip antenna breakout board, since it must sit within a metallic groove. The plan is a PCB of 10mm diameter with an U.Fl connector on the back and an antenna ...
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19 views

Asus Pg278q mainboard component

Hi I'm looking to repair the mainboard of my gaming monitor but I'm having a hard time finding the name of the burnt out components. I can't even find the schematic. Please help Asus pg278q monitor.
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41 views

Removing single 1212 (3030) LED

Is there any way to remove and replace a single 1212 (3030) LED from a heat-sink board as shown in the images?
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28 views

Identify smd capacitors

These smd capacitors have come off an old discman board. I've been looking into the main manufacturers (at mouser.com), but didn't find the exact labeling. They look like a 3.3uf 50v and 4.7uf 35v. ...
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97 views

Identify SOT-23-6 component marked “FGSU” or “FG0U” (perhaps RF switch or amplifier)

I have a real problem in finding the component that has SMD marking "FGSU" or "FG0U". By "or" I mean I see them both in the same circuit design in the same place. It's a component that is used in MRI ...
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55 views

Identify 6-pin SMD device with top marking A6DB 276

Please help me to identify the circled 6-pin SMD device with top marking A6DB 276 and its manufacturer.
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73 views

Identify some SMD components

I need to identify some SMD component. COMPONENT 1: Markings are T5 and G7. Seems package is DFN 6. COMPONENT 2: Markings are J90 (underscored) Package is a 6 pin SOT This one I suspect is some ...
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48 views

5-pin SMD device identification - top marking CaC9A

Please help me to find the name of this SMD device with top marking CaC9A
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47 views

Diffrence between cr0603 and r0603

I am shopping for parts on mouser and was wondering if someone knew the difference between cr0603 and r0603 concerning smd resistors. You see this one has code CR0603 https://www.mouser.ca/...
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69 views

Please help me identify the SMD component

I have two nVIDIA Quadro P5000 GPUs. This component got damaged in one of the GPU while I was removing it from the PC. Please help me to identify this SMD component so that I could purchase and solder ...
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1answer
62 views

Is it easy to predict or get notified about obsolescence for DIP ICs?

The question here might seem a bit tangent for this Stack Exchange but here it goes. In the product development phase, one of the important factors under consideration is the availability of selected ...
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1answer
135 views

Need help on troubleshooting PCB circuit

I recently got a freelancer to design a push-button latching circuit that powers a 12VDC motor from a 1S1P Li-Po cell. I have soldered all the components but the board does not seem to work properly. ...
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96 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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1answer
67 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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67 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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49 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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34 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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39 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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2answers
76 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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61 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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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
62 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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111 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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92 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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44 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
146 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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56 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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93 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
400 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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53 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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97 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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114 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 ...