The meaning of silk screen letters on the PCB board

On the PCB board, there are a lot of silk screen letters, such as R107, C118, Q102, D202 and so on. Do you know what these letters mean?

In fact, the letters on the PCB board represent the abbreviation of electronic components, and often follow the numbers behind the letters, and these numbers are also meaningful. 

B: Buzzer 

C: Capacitor 

D: diode 

F: fuse 

J: jumper 

L: Inductor 

Q: transistor 

R: resistor 

S: thermistor 

T: transformer 

U: chip, integrated circuit (IC)

W: regulator 

Y: crystal oscillator

R107, C118, Q102, D202 and other numbers are often seen on the PCB board. In general, the first letter identifies the device category, such as R for resistor, C for capacitor, D for diode, Q for transistor, etc. The second is a number, indicating the circuit function number, such as "1" means the motherboard circuit, "2" means the power circuit, etc., which is determined by the circuit designer; The third and fourth digits indicate the serial number of similar devices on the PCB board.

kingford Electronics Co., Ltd. specializes in providing integrated PCBA electronic manufacturing services, including upstream electronic component procurement to PCB production and processing, SMT patches, DIP plug-ins, PCBA testing, finished product assembly and other one-stop services.

The company gives full play to its competitive advantages in scale procurement and quality control, and has signed long-term cooperation agreements with many electronic component manufacturers at home and abroad and around the world to ensure the quality and stable supply of raw materials, and transfer the benefits to customers.

Long-term maintenance of IC, resistors, capacitors, inductors, audiodes and other components procurement advantages, can greatly save customers' inventory costs, improve production turnover efficiency, save time. Currently for the United States, Britain, Japan, Russia, France, Canada, Australia, Romania, Switzerland and other countries and regions to provide PCBA processing services. 

We provide PCBA processing services, starting from PCB circuit board production, our own PCB manufacturers (obtained the extremely strict automotive industry TS16949 certification), focusing on the quality of the PCB circuit board and PCBA quality control system. Due to decades of experience in purchasing electronic components, we maintain long-term cooperation with large brands to ensure the original packaging and procurement channels of components. 

In the packaging process of components, the selection of thousands and Locai solder paste to ensure the reliability of welding, with automatic printing press, Panasonic high-speed placement machine, upper and lower eight temperature zone reflow, AOI automatic optical detector, can effectively ensure the reliability and quality of electronic packaging process. In addition, perfect IPC, IPQC, OQA and other management processes, clear job responsibilities, strict implementation of IPC electronic assembly acceptance standards. 

For PCBA testing, we have professional engineers to perform 100% batch testing using a variety of test stands, including channels, noise, amplitude, signal, temperature, humidity, drop or to perform customer-specific test plans. All efforts are aimed at becoming a refined PCBA processing factory.