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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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1answer
95 views

Is there any push-button off-on switch? [closed]

I have the following problem, I need to use a pushbutton that is of the switch type on / off, but I do not get any since all are of momentary action and I need one that maintains the state until I ...
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2answers
211 views

What ohms reading will be 10U 25V Capacitor [closed]

I am noobi in soldering and don't have much knowledge to identify components, i have a lot of Capacitors and resisters, now i want to know if i need 10U 25V Capacitor from what i have stock than how i ...
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0answers
101 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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2answers
1k views

using plumber's copper solder as a “solder paste” for SMD components

Can I ? :D It is what I currently have plenty of lying around and, well... it says S-Sn97-Cu3 at composition If not, could I use regular solder wire, coat the SMT ...
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1answer
1k views

MLCC Capacitor color

Why MLCC capacitors have a different colors ranging from Brown to White? I wonder if it is related to ceramic / dielectric type or maybe some manufacturing reasons? Maybe manufactures add pigment in ...
3
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1answer
1k views

SMD Component Identification 6 pin with diode properties

I am having a difficult time trying to identify the following 6 pin SMD component: I have been searching for what it might be, or the company who made it but have had no luck thus far. It seems to ...
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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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1answer
93 views

Unknown “GG6M” smd integrated circuit

I bought 6 month ago a controller for a screen (T.VST59.031) https://fr.aliexpress.com/store/product/Free-Shipping-T-VST59-031-V59-universal-definition-LCD-TV-panels-HDMI-LCD-driver-board/...
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4answers
129 views

Identifying a SMD component?

anyone has seen the component in picture? I have searched google but no results.
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1answer
238 views

identifying a SMD chip: A44 66P2

I have a handful of these chips and I'm trying to figure out what they are. This post links to two sites, smdcode and s-manuals. The former is dead and the latter only classifies A44 as perhaps a ...
36
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1answer
55k 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 ...
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1answer
263 views

in Eagle, how to exclude SMD pad from the tCream layer

In Eagle, how do you exclude SMD pads from the tCream layer such that in gtp there is no pad there?
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1answer
62 views

Component ID: AA3 03

I'm trying to identify a fault on a printed circuit board in a consumer product. So I tried to find a pin-out diagram, specifications, etc. for this surface mount component designated AA3 03: There ...
6
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1answer
375 views

Design constraints when dealing with very high resistances in op amp's feedback loop

I have designed a PCB for a charge amplifier to handle a piezoelectric sensor, the first prototype is working properly. However, now coming down to the specific working frequency range, since the ...
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1answer
144 views

Help identify these two components

I am trying to identify these components, and I couldn't find anything with just the marking. Any help is appreciated. The first picture I thought is Passive crystal/oscillator!!! This one is marked ...
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2answers
460 views

SMD diodes suitable for hand soldering

I have done a fair amount of soldering with SMD components now. I can solder an 0402 size component I prefer not to. I can solder an 0603 just fine and anything bigger. But my question is, what diode ...
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1answer
1k views

How to tell if capacitors are damaged?

I have two identical devices, the Megger MIT525 5 kV Diagnostic Insulation Resistance Tester. One of them present this behavior: When it is charging connected to the electric network, the device turn ...
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0answers
365 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 ...
2
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2answers
232 views

SMD Elements on the back of THT

I'm designing a PCB right now and found out I can save a lot of space using the back of THT elements: In the picture there's IC1 (ATMega) and LCD. I design only 1-sided PCB for now. IC1 and LCD are ...
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2answers
153 views

Surface scratch between neighbor SMD components

I recently started an advanced SMD soldering project. I hqve a couple smaller projects under my belt, so I'm raising the bar this time. I was pre-tinning some 0603 resistor and capacitor pads and ...
0
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1answer
508 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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2answers
145 views

AVR Programming problem

I recently soldered a ATMega328P in a TQFP package onto a PCB I designed. The conncetions seem to be fine and there are no bridges. I have used 100nF decoupling caps on the power pins. The RESET pin ...
7
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3answers
460 views

Needed PCB surface to cool a SOIC-8 EP package

I have got a part in a SOIC-8 EP package. The "EP" indicates it is a package with a exposed pad which can transfer heat to the PCB. I would like to have a better understanding how much pcb surface I ...
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2answers
1k views

Placing the pads of SMD components in different layers (KiCad PCB design)

I am designing a PCB with KiCAD where components such as SMD resistors and capacitors are placed before and after DC/DC converters. I am trying to build two different common grounds: one placed on ...
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4answers
1k views

Can you put a through-hole part behind an SMT part?

I'm wondering if it's possible to place a through-hole connection on the opposite side of an SMT microcontroller. I have a small connector with a solder pin (for the shield) on one side of the board, ...
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0answers
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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1answer
316 views

Identifying SMD Resistor with a code that contains a colon

What are the blue components seemingly labeled "69:1" in the attached image? There is reason to believe that they are resistors, but of what value? I thought perhaps the ":" is a "00" written on top ...
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1answer
1k views

Centroid of component for pick and place machine using Eagle

Just finished designing a PCB and sent the Gerbers off to my board house (Bittele) and they have requested that I also provide them with a pick and place file. Using Eagle, I ran mountsmd.ulp and ...
3
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4answers
1k views

How to check if the pin headers are soldered well?

I don't have much soldering experience. I soldered 5 level converters, they seem to work and look about the same as this STM32 as I soldered. However, after a closer look I see not all pens 'shine' ...
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2answers
588 views

How to identify the value of a SMD resistor soldered on a board and without marking?

How to identify the value of a SMD (surface-mount device) resistor soldered on a board and without marking? I suppose it is in 0603 package considering my measurements. Is there a way to do that? Or ...
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1answer
102 views

Need help identifying part [closed]

Hello i have what looks to be a PNP transistor.The marking code on it is U3W with the numbers 65 rotated 90 degrees next to U3W.Its a Sot-23-3 package,refer to image of schematic of how its connected. ...
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0answers
143 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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2answers
714 views

Identify SMD component

Could anyone help me identify what component this is, it's value and explain how they could tell. I would like to be able to do this myself but turned a blank on Google. What ever it is, it appears ...
3
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1answer
373 views

Identify Mystery SMD component code 470C

I have a BLDC driver board and am having trouble identifying a component. Its PCB label is X3 so I initially assumed it was a fuse of some type. However it is connected in 3 spots. I searched smd code ...
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2answers
476 views

What is the type of this surface mount transistor?

I have a no frost freezer which stopped freezing efficiently and after some research and trials I found the problem to be related to control board. And as of now I am pretty sure the problem is with ...
11
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1answer
10k views

Is there a difference between SOIC and SOP?

I'm looking at two integrated circuit packages: SOIC and SOP. They seem (almost) identical (pitch, overall size, etc...) SOP SOIC Is there any important differences between these two packages that ...
2
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2answers
349 views

Baking SMD integrated circuits for prolong time

I recieved samples of AD7175-2 and AD5684R with an instruction: If these samples are to be subjected to solder reflow or high temperature process, they must be baked for 24 hours at 125°C prior ...
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8answers
7k views

How do I prevent bridges while soldering SMD Components?

I have noticed that whenever I try to solder a component with many pins close together (like an IC), I get tiny bridges of solder, which shorts the pins. Is there any easy way to solder SMDs without ...
1
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2answers
283 views

How to find TPH equivalence to SMD parts [closed]

I'm trying to reproduce the following schematic but it's designed with SMD components, I want to build it with the TPH equivalents, the problem is with diodes, I have found S1A is equivalent to 1N4001 ...
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3answers
772 views

How to find SMD resistor values and size?

I want to do reverse engineering of a PCB, in which some SMD resistors are used. On top of each resistor it has marked with 1R0, 150 , 0 etc. Is that represents the value of the resistor? If so, how ...
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0answers
200 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: ...
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1answer
171 views

what component is this? Looks like a cap [duplicate]

It looks to be a cap,and i can measure 2.2uF using my multimeter.From the circuit the cap is in parallel on the positive side of where a ac/dc power source gets plugged in and goes into the Vin on a ...
0
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1answer
195 views

what tool to use for smd mark code to part number

Is there anyway to find a chip part # based only on the mark codes.it says 633 then below it says MV.from the circuit it seems to be a cap at 2.2uF. any help is appreciated thanks.
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2answers
505 views

help identify the part number from the marking of SOT-23 components

I want to figure out the part number of the following components all (SOT-23) from a 20 year old PCB i am trying to fix , it is coated with conformal coating , but i scratched the top of these ...
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0answers
324 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 ...
0
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1answer
98 views

Compatibility between XBEE-PRO 900 HP and XBEE SX

I wanted to use a 900 MHz xbee and I need one side to be surface mount. So I'm thinking of getting an XBEE PRO 900 HP (XBP9B-DMST-002) and an XBEE SX (XB9X-DMUS-001). These devices have the same ...
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1answer
56 views

Need to make a 4 position switch using one button input and SMD IC's

I have a system that can only have one push button input and I positions . I'm limited on space and power, however I will gladly yield some power to save space. I'm trying to find integrated ...
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2answers
297 views

Fried transistor identification help [closed]

I know this is sometimes a contentious question but this this one isn't marked with anything I recognise ... See image below there are 4 transistors, 2 marked "NY" and 2 marked "MY". No other visible ...
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0answers
51 views

When did they start making SMD2835 and others

i'm trying to build the chart of LED efficacy and power change over the past couple of years. does anybody know when did they start making 2835, 3528, 3014, 5630? google gives me 2015ish for 2835, ...
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1answer
1k views

Are there any SOT-23 BJT's with swapped Base and Emitter pins? [closed]

The standard NPN BJT in SOT-23 package has the following arrangement of pins: Do you know of any transistor that has pins 1 and 2 reversed? So that 2 is the base while 1 is the emitter (Doesn't ...