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Marking Query

When it comes to marking query screen printing for electronic components, specific models can be identified based on the information provided above the components. Generally, electronic components have their own screen printing, such as chip resistors. For example, a chip resistor may have the screen printing "102" to represent a 1K resistor with a 5% accuracy. On the other hand, "1001" may also indicate a 1K resistor, but with a 1% accuracy. The markings "102" and "1001" correspond to the values of 1K ± 5% and 1K ± 1%, respectively.

In most cases, approximately 95% of the components have their own screen printing. These markings can vary based on different standards (such as GB), manufacturers, and component types. Examples of components with screen printing include plug-in resistors, chip resistors, electrolytic capacitors, tantalum capacitors, safety capacitors, and polyester capacitors. By observing the markings on these components, one can determine the type of component and its value. For integrated circuits (ICs), the factory's screen printing provides information such as the company's logo, model number, and batch number. The information about a particular IC can be found on the official website of the manufacturer, such as NXP for the LPC2119 chip. Similarly, for chips like the ST7282, which is manufactured by ST, the manufacturer's identity is easily recognizable.

However, the challenge arises when dealing with the screen printing of certain components, especially transistors. Firstly, transistor sizes tend to be relatively small, making it difficult to print detailed information. Additionally, various manufacturers produce transistors, both domestic and foreign. Among the well-known domestic manufacturers is Long Power, while foreign manufacturers include ST, NXP, TI, and others. For instance, a Long Power transistor labeled "Y1" may not be easily identifiable to someone unfamiliar with electronics, but those knowledgeable in electronics would recognize that "Y1" represents the SS8050 transistor. Similarly, East Conduction Technology has compiled a reference for commonly used transistor codes.

Code	Device	Manufacturer	Base	Package
12A	MMBD1502A	Nat	K	SOT23
12A	PZM12NB2A	Phi	A	SOT346
12E	ZC2812E	Zet	D	SOT23
12V	PZM12NB	Phi	C	SOT346
12Y	BZV49-C12	Phi	O	SOT89
13	DTA143EUA	Rho	N	SC70
13	DTA143EKA	Rho	N	SC59
13	DTA143ECA	Rho	N	SOT23
13t	BC846BPN	Phi	N	SOT363
13s	BAS125	Sie	C	SOT23
13s	BAS125W	Sie	C	SOT323
13	MA4CS103A	M/A	C	SOT23
13	MUN5313DW1	Mot	DP	SOT363
13A	MMBD1503A	Nat	D	SOT23
13A	PZM13NB2A	Phi	A	SOT346
13E	ZC2813E	Zet	A	SOT23
13V	PZM13NB	Phi	C	SOT346
13Y	BZV49-C13	Phi	O	SOT89
14s	BAS125-04	Sie	D	SOT23
14s	BAS125-04W	Sie	D	SOT323

When we come across the same screen printing on different models, how do we determine the specific model? In such cases, it is necessary to rely on physical analysis, which is typically based on schematic analysis.

In some cases, we encounter chip components that have no silk screen markings. There are a few reasons for this. Firstly, manufacturers may customize components according to specific customer demands and choose not to include silk screen markings (Marking) on the components. Secondly, it could be due to deliberate actions by the manufacturer to polish off the original markings in order to prevent technology leakage. Thirdly, over a long period of use, the screen printing may naturally wear off. However, such cases are quite rare and unlikely to occur frequently.

What should you do when faced with such a situation? Identifying the model of the chip becomes the most challenging aspect in the Marking query. This process requires a certain level of technical expertise and a stroke of luck. There are various methods for conducting the query, and depending on the type of Printed Circuit Board Assembly (PCBA), the PCB schematic can be used as a reference. Alternatively, clues can be sought directly from the film itself. Shenzhen East Guide Technology possesses a strong advantage in this area, offering expertise in navigating and solving such challenges.

Code	Device	Manufacturer	Base	Package
12A	MMBD1502A	Nat	K	SOT23
12A	PZM12NB2A	Phi	A	SOT346
12E	ZC2812E	Zet	D	SOT23
12V	PZM12NB	Phi	C	SOT346
12Y	BZV49-C12	Phi	O	SOT89
13	DTA143EUA	Rho	N	SC70
13	DTA143EKA	Rho	N	SC59
13	DTA143ECA	Rho	N	SOT23
13t	BC846BPN	Phi	N	SOT363
13s	BAS125	Sie	C	SOT23
13s	BAS125W	Sie	C	SOT323
13	MA4CS103A	M/A	C	SOT23
13	MUN5313DW1	Mot	DP	SOT363
13A	MMBD1503A	Nat	D	SOT23
13A	PZM13NB2A	Phi	A	SOT346
13E	ZC2813E	Zet	A	SOT23
13V	PZM13NB	Phi	C	SOT346
13Y	BZV49-C13	Phi	O	SOT89
14s	BAS125-04	Sie	D	SOT23
14s	BAS125-04W	Sie	D	SOT323

When we come across different models with the same screen printing, how can we determine their specific model? The key lies in conducting a physical analysis, typically based on the schematic diagram.

In some cases, we may encounter chip components on which no silk screen markings are present. Why does this occur? There are a few reasons. Firstly, manufacturers may customize components according to specific customer demands, and as a result, they choose not to include silk screen markings (Marking) on those components. Secondly, it could be a deliberate action taken by the manufacturer to polish off the original markings in order to prevent the leakage of their proprietary technology. Thirdly, over time, the screen printing on components may naturally wear off. However, it's important to note that such cases are quite rare and occur infrequently.

What should you do when faced with this situation? Identifying the model of the chip becomes the most challenging aspect of the Marking query. It requires a combination of technical expertise and a bit of luck. There are various methods for conducting the query, and depending on the type of Printed Circuit Board Assembly (PCBA), the PCB schematic can serve as a valuable reference. Alternatively, clues can be sought directly from the film itself. Shenzhen East Guide Technology possesses a relatively strong advantage in this area, providing expertise in navigating and solving such challenges.