PCBA Tech - Component description of PCBA patch processing

PCBA patch processing mainly includes two major processes: PCB circuit board production and PCBA patch processing. Electronic components are inevitably used in the middle. Electronic components are the basic part of PCBA patch processing and also affect the performance and quality of PCBA finished products. Key factor. So what are the commonly used electronic components for PCBA patch processing?

1. Resistance

Resistor is an electronic component with resistance characteristics, and it is one of the components widely used in PCBA processing. Resistors are divided into fixed resistors and variable resistors (potentiometers), which play the role of voltage division, current shunting and current limiting in the circuit.

2. Capacitance

Capacitor is also one of the basic components in PCBA processing. It is a component that stores electrical energy and plays the role of coupling, filtering, DC blocking and tuning in electronic circuits.

3. Inductance coil

Inductance coil is abbreviated as inductance, which has the function of storing magnetic energy. Inductance coils are usually composed of bobbin, winding, shield, magnetic core and so on.

4. Potentiometer

A resistor whose resistance value can be changed, that is, a resistor that can be continuously adjusted within a specified range, is called a potentiometer. The potentiometer is composed of a shell, a sliding end, a rotating shaft, a ring resistance body and 3 lead-out ends.

5. Transformer

The transformer is composed of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding.

A transformer is a device that transforms voltage, current, and impedance. When an alternating current is passed through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil. Transformers are mainly used for AC voltage conversion, current conversion, power transmission, impedance conversion and buffer isolation, etc., and are one of the indispensable important components in the PCBA machine.

6. Crystal diode

Crystal diodes (ie semiconductor diodes, hereinafter referred to as diodes) are made of a PN junction, electrode leads, and an externally sealed tube case. It has unidirectional conductivity.

7. Transistor

Transistor (hereinafter referred to as triode) is the core device for signal amplification and processing, and is widely used in PCBA complete machines.

8. Field effect tube

The field effect transistor (referred to as the field effect tube) is also a kind of semiconductor device with a PN junction. Unlike the triode, it does not use the conductivity characteristics of the PN junction, but uses its insulation characteristics.

9. Electroacoustic devices

The devices used in the circuit to complete the conversion between electrical signals and sound signals are called electro-acoustic devices. It has a wide variety of speakers, microphones, earphones (or earplugs), microphones, receivers, etc.

10. Optoelectronic devices

Photoconductive devices that use semiconductor photosensitivity to work, photovoltaic cells and semiconductor light-emitting devices that use semiconductor photovoltaics to work are collectively referred to as optoelectronic devices.

11. Display device

Electronic display devices refer to photoelectric conversion devices that convert electrical signals into optical signals, that is, devices used to display numbers, symbols, text or images. It is a key component of an electronic display device and has a great impact on the performance of the display device.

12. Sensor

A sensor can sense a device or device that is measured and converted into a usable signal according to a certain rule. It is usually composed of sensitive components and conversion components.

13. Surface mount components

Surface mount components (SMC and SMD) are also called chip components or chip components, which include resistors, capacitors, inductors and semiconductor devices, etc., have small size, light weight, no leads or very short leads, High installation density, high reliability, good anti-vibration performance, easy to realize automation and so on.

14. Thyristor

SCR is the abbreviation of SCR rectifier element. It is a high-power semiconductor device with a four-layer structure with three PN junctions, also known as a thyristor. It has the characteristics of small size, relatively simple structure, and strong functions. It is one of the more commonly used semiconductor devices.

15. Switches, relays, various connectors

Switches are used in electronic equipment to cut off, connect, or switch circuits. A relay is an automatic control device whose output will change leaps and bounds when the input (electricity, magnetism, sound, light, and heat) reaches a certain value.

What are the two processing methods for PCBA patch processing

The process flow of PCBA processing is very complicated, including many important processes such as PCB board manufacturing process, component procurement and inspection, SMT patch assembly, DIP plug-in, PCBA testing and so on.

The PCBA patch processing link can be divided into manual patching and machine patching according to the actual production quantity. Generally, samples with a quantity of less than 20PCS use manual patching, so what are the advantages of sample manual patching? The following Shenzhen Honglijie introduces to you:

1. What are the advantages of manual placement compared to machine placement?

1. Manual placement is more flexible, suitable for sample placement needs of small and medium-sized companies in the early stage of entrepreneurship.

2. The completion time is relatively short, 10PCS can generally be completed in 1 day.

3. There is no need for tray loading, just loose materials, and some materials can be purchased loosely on the market.

4. There is no material throwing of the high-speed placement machine, and there is generally no need to prepare another material.

5. No additional engineering fee or start-up fee will be charged.

2. How to control the quality of manual patch?

1. Generally, very experienced personnel are responsible for IQA, IPQA, OQA and other responsibilities.

2. Generally, a magnifying glass is used to inspect all the products.

3. All employees of the company have more than 4 years of relevant work experience in SMT factory.

3. How to prevent the wrong placement of the manual PCBA patch?

1. Analyze the BOM first, and each component is marked with a different color on the corresponding silk screen position map.

2. In the placement process, separate people and place different components. The next person needs to perform a simple check on the previous person's placement position and components.

3. Use magnifying glass to inspect all the products.

4. Is there any guarantee for BGA welding?

The visual alignment system BGA welding table is used for welding, which can fully guarantee the welding quality of BGA.