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Questions tagged [markings]

Used when asking questions about the meaning or use of marks, symbols or codes used on components, PCBs, or cases with regard to controls or connections. Can be used for advice to help identify marking meanings or what markings to use to help others identify.

2
votes
2answers
173 views

What is this component? Marked R5

Edited: Added more pictures. I'm reverse engineering a PCB but I'm stuck at one component. I can't find out what it is. I thought it is a diode because of the marking on top of it but when I test it ...
4
votes
0answers
137 views

How to identify SMD device marked LEFBV?

I have a SOT23-3 component marked \$\underline{\textrm{L}}\,\underline{\textrm{E}}\,\overline{\textrm{F}}\,\overline{\textrm{B}}\,\textrm{V}\$ as shown in the following images: The following ...
2
votes
1answer
40 views

How to read markings on EMI/RFI filter

I am looking at a 3-pad SMD EMI filter chip (see photo) which is marked on the top with "222J". I am familiar with reading the markings on top of resistors and capacitors, but am not sure how to ...
0
votes
1answer
77 views

KV7RF SMD Datasheet

Can someone identify a 5-Pin IC SMD with the marking code KV7RF? Searching in Google I didn't find anything. Any help on this?
6
votes
4answers
7k views

Why datecode is SO IMPORTANT to chip manufacturers?

With the miniaturization of the devices, chip marking has shrunk, not only in size, but also in content. And while the part number got compressed to as little as two letters (or in some cases ...
3
votes
1answer
46 views

How do I identify the SMD component marked as !3S 4?

I have a SOT-23 SMD component marked \$\underset{\bullet}{\vert}3\bar{\textrm{S}}\;\bar{4}\$ as shown in the following images I managed to find out that \$\textrm{3S}\$ stands for MMBT5551 NPN ...
1
vote
2answers
67 views

Component recognition from marking code

I need help to recognize a dead component from a lab instrument control board. It is part of a TTL-serial interface, arguably a logic gate or some level shifter, in a TSSOP-14 package. You can see ...
1
vote
1answer
57 views

Axial Lead Capacitors - BC 050 - What Are These Markings?

EE, I am trying to fix a circuit and have come across a group of axial capacitors with markings that I have had no luck deciphering. As best as I can tell, they are marked "BC 050" which doesn't ...
0
votes
1answer
99 views

Radial capacitor marking

I have radial capacitors with markings 235 RCN on one side and 333 C5K on the other side. How do I interpret these? Front side: Back side:
1
vote
1answer
177 views

What does it mean when a capacitor and it's connectors are marked with a red marker?

Is there some kind of convention in electrical component maintenance that would explain a red marking on a capacitor? I found this in my Pioneer SA 5300 audio amplifier and wondered if this carried ...
0
votes
1answer
222 views

Need help! SOT23 SMD transistor identify by marking FEQEQ

Can somebody help me to identify SOT23 SMD transistor by marking FEQEQ
0
votes
0answers
1k views

6 pin SMD IC marking code ADS

Please help me to identify 6 pin SMD IC with top marking ADS
0
votes
1answer
2k views

SMD transistor marking

I have a SOT-23 SMD transistor marked "2.X L" as shown in the image. I managed to find out that "2X" stands for 2N4401 and the dot seems to mean "lead free". But I couldn't find the meaning of the ...
1
vote
0answers
355 views

How to identify a dead potentiometer?

So, I've cracked open my Roland Micro Cube which is a portable 2W guitar amplifier with digital modelling. The issue I've had with it since recently is the tone control potentiometer. Here's a picture ...
3
votes
1answer
934 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 ...
1
vote
1answer
99 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. ...
0
votes
0answers
161 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: ...
-1
votes
1answer
166 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
votes
1answer
184 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.
0
votes
0answers
2k views

Explaining the date code of Nichicon electrolytic capacitors

I want to know how to read the date code of Nichicon brand electrolytic capacitors. For example - I have the capacitor wit date code B1538. So it means it was ...
0
votes
2answers
299 views

ESD label requirements

We buy a board which has been designed in Germany specifically for us, the board is manufactured in China and delivered straight to our manufacturing plant (not in Germany). There is a ESD label on ...
2
votes
1answer
1k views

Why are capacitors usually marked on the negative terminal, not positive?

Does anyone know the reason (historical, practical, etc) that polarized capacitors usually have the negative lead marked instead of the positive lead? I would expect markings to indicate a positive ...
1
vote
1answer
985 views

What does the reference designator DB mean when printed on a PCB?

I have seen this question but I can't seem to find a meaning for DB. What does DB mean? Circuit from Plasma Lamp Circuit from Fluorescent Light bulb Even my lucky light bulb has it!
0
votes
1answer
392 views

Transistor with S250 marking

does anyone knows what type of transistor this is: DGS S250 PH1d Thanks in advance, Pedro
12
votes
2answers
1k views

What do capacitor markings in dash-dot style mean?

I have got a few capacitors in my sortiment which have got dash-dot markings above and below the value code, like this: What do these dash-dot codes mean? Do they reflect voltage rating or ...
0
votes
1answer
663 views

What does the 3-figure code below the value code mean?

I have got plenty of capacitors which I do not know the manufacturer of. They are all marked with the 3-digit value code (for instance, "153", meaning 15×103 pF = 15 nF). There is a second code ...
7
votes
3answers
3k views

Date code in components marking

In some datasheet (two example in links below) I see only this information, about production date, in marking code explanation: Date code (A : 1997.1) If there ...
2
votes
1answer
803 views

SOT 23 package marked as A1⌐

Im currently trying to repair a board and I found this SOT23 component marked as A1⌐ (last symbol is a 7 but rotated 90 degrees to the left, I think). In the board is marked as D15 so I assumed ...
1
vote
1answer
444 views

What do the “F+” and “F-” pins on a power supply unit stand for?

I have a power supply unit I extracted from a media player and there is a pin connector with the labels "-24V", "GND", "F+", "F-". I know what the first two mean but what do the last "F+" "F-" mean? ...
1
vote
1answer
344 views

Reverse engineering a high side MOSFET driver SMD circuit board

I am trying to reverse engineer a high side MOSFET driver smd circuit and I have a few components. I am trying to gather data for it. One is a diode with markings ...
8
votes
3answers
2k views

What does the “D/V” marking on small DC motors mean?

I have noticed with the large amount of optical drives and CD/DVD players I have taken apart that most of the spindle motors (RF-300, RF-310, RF-400, etc.) have the somewhat cryptic marking "D/V 5.9" ...
13
votes
1answer
3k 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 ...
1
vote
1answer
753 views

How to infer pinout and winding ratio of this transformer?

Hi, I pulled this transformer from an EL wire inverter and am trying to figure out how to infer: Which pins correspond to the primary and secondary coils The ratio of the windings Any other useful ...
6
votes
2answers
867 views

Help understanding “unusually talked about” transistor code markings

I am a beginner trying to gain a better understanding of transistor codes. Before posting this, I searched the web looking for answers but I was unsuccessful. Please take a moment to look at the ...
11
votes
3answers
14k views

SMD LED polarity marking: is the cathode marking standardized?

SMD LEDs normally have some kind of marking like the following image from here indicates: The site states The CATHODE lead is always the lead to be identified with ALL LEDs, including surface-...
1
vote
4answers
6k views

Surface mount capacitor marking

In general... 1206 resistors have their value marked on them. Why don't 1206 capacitors have their values marked? The only reason I can guess is that marking them would somehow change their ...
1
vote
0answers
146 views

Any Home Made Alternatives to using X-rays to identify ICs?

I am on the hunt for several ICs by searching for the markings on them. But sometimes the markings are just too vague and I cannot really guarantee that the IC I found is the IC I am looking for. I ...
0
votes
2answers
893 views

Identifying an IC with markings: 0270000 DCP1227 0601

I have a chip on one of my boards, and I cannot identify it. I tried differnet variations of search patterns but I cannot find it anywhere. The marking on the chip are in three rows as following: ...
4
votes
3answers
2k views

Really odd capacitor markings

I got some capacitors about two years ago now, which I foolishly removed from their bag, and I quickly forgot their markings. I can't even figure out which kind of capacitor it is. Tantalum seems the ...
5
votes
3answers
8k views

What is the meaning of speed grade marking on Xilinx FPGAs?

According to Xilinx FPGA product datasheets, the numbers on the 5th line as 4C or 5I stand for speed grade and temperature.I have a XC3S400 with 4C speed grade (4= standard speed, 5= High performance)....
6
votes
2answers
434 views

What is this IC marked “1Y=61J”

I have opened up my friend's laptop and cleaned up the fan and changed the thermal paste. Then, I closed it up and the screen did not work. Also, connecting a monitor via VGA doesn't help, the monitor ...
53
votes
4answers
142k views

What do the PCB markings mean?

On a printed circuit board, I see lots of tiny letters and numbers. Is there some kind of standard that dictates what letter indicates what type of component?
24
votes
4answers
76k views

Ceramic capacitors: how to read 2-digit markings?

Related question: Ceramic capacitors: how to read 3-digit markings? I have some ceramic capacitors with a 2-digit marking. How to read them? Do the colored markings at the top mean anything? Image ...
5
votes
1answer
261 views

Need help deciphering markings on an electrolytic capacitor

I have a capacitor which is marked with "1200uF200wv". What does the "w" mean?
6
votes
3answers
3k views

What are markings on top of electrolytic capacitors?

I often see a marking like the following pattern on the top of radial PTH elcos. What does it mean? Is it an identification of the manufacturer?
6
votes
3answers
14k views

Small SOT-23 transistor markings

I've got a SOT-23 transistor (I think, but it could also be an IC) marked with 1E. Another one is marked with A7W. Then I can also see WR5. How are you supposed to decode these?
1
vote
2answers
463 views

Marking for Operating Tempature Range on Diode's data sheet?

My diode is: VISHAY GENERAL SEMICONDUCTOR 1N4004-E3 Diode Diode Type:Standard Recovery; Repetitive Reverse Voltage Max, Vrrm:400V; Forward Current, If(AV):1A; Forward Voltage Max, ...
10
votes
4answers
14k views

Various Small capacitors' markings?

Wikipedia explains the basics about the markings of capacitors, here. It lacks many markings most of which confuses me: Ceramic brown-yellowish cap 104 K5K (small ) --- what is the end "5K"? (...
15
votes
1answer
5k views

What does the e3 or e4 printed on an IC mean?

So after staring at a few ICs today, I was wondering what the "e3" or "e4" stands for on the top of an IC. For example, here is an e3: