The principle of PCB electronic components layout

Components is the independent individual in electronic circuit, through which an electric current amplitude frequency change or change flow direction of individual parts called device, otherwise is called components. In a semiconductor circuit transistors ( Transistors, diodes, silicon controlled rectifier, etc. ) Is the device, and resistor, capacitor, inductor is components, collectively called components. And one of electrolytic capacitors, ceramic capacitors, safety capacitors is belong to the PCB in the comparison of several common components, electronic components on the quality of international of eu CE certification, American UL certification and China CQC certification certification at home and abroad, such as to ensure that the components of qualified. In this paper, the comprehensive introduce you to what is PCB layout principles of circuit components. A: components single best placed. If you need to double placed component, at the bottom ( 底层) Place the pin type components) Components single best placed. It is possible to cause the circuit board is not easy to put, is unfavorable to welding, so at the bottom ( 底层) The best place patch yuan only at the bottom ( At the bottom) , similar to common computer graphics components on the PCB layout method. Only when the single placed on the circuit board of a do silk screen layer, easy to reduce costs. 2: reasonable arrangement of the position of the interface components and direction. In general, as a circuit board and the outside world, Power supply and signal lines) Connect even in general, as a circuit board and the outside world, Power supply and signal lines) In general connector components, often at the edge of the circuit board, such as serial port and parallel port. If placed in the middle of the circuit board, apparently for wiring, connector components, usually at the edge of the circuit board, such as serial port and parallel port. May also be unable to connect because of the other components of the block. Also should pay attention to the direction of the interface, when placed interface makes the connection wire can be placed in the interface should pay attention to the direction of the interface, when placed in the interface should pay attention to the direction of the interface leads to smoothly, away from the circuit board. Successfully lead, away from the circuit board. Interface place after the completion, should use interface components of the String ( String) Clearly indicate the type of the interface; For class interface power supply shall be marked voltage grade, prevent caused by wrong wiring circuit board burned. For class interface power supply shall be marked voltage grade, prevent caused by wrong wiring circuit board burned. 3: high pressure components and low voltage components should have wide electrical isolation belt between the best. That is to say, don't take the difference in voltage grade) High pressure components and low voltage components should have wide electrical isolation belt between the best. Don't put the difference in voltage grade of components, the components are put together, is advantageous to the electrical insulation already so, also has great benefits for the signal isolation and anti-jamming. 4: closely related to electrical connection components best placed together. This is the layout of the modular thought) That is close to the electrical connection components best placed together. This is the layout of the modular thought. Five: the noise generating components, such as clock generator vibration and high frequency components, should try to put them in place) For the components of the noise, such as clock generator vibration and high frequency components, such as clock input. Large current circuit and switch circuit is easy to generate noise, placed near the CPU clock input. Large current circuit and switch circuit is easy to generate noise, in the layout of these components or modules should be far away from the logic control circuit and storage circuit of high-speed signal circuit, or module should be far away from the logic control circuit and storage circuit of high-speed signal circuit, if possible, try to adopt the way of control board combined with the power board, using the interface to connect to, in order to improve the anti-interference ability and the work reliability of circuit board as a whole. Six: the serial number of components should be close to the components of the border to decorate, uniform size, direction and tidy, not with components, via and bonding pad weight) The serial number of components should be close to the components of the border to decorate, uniform size, direction and tidy, fold. Components or connector pins 1 said direction; Is the sign of the cathode should be clearly marked on the PCB, is not permitted to cover; Power conversion components ( Power source and switch power converter, linear transformation) Power conversion components ( Such as DC/DC converter, linear transformation power supply and switching power supply) Side should have enough heat dissipation space and installation space, with sufficient welding outer space, etc. With sufficient welding peripheral space, etc. Above is the principle of components in the PCB layout, because the components of its particularity generally don't recommend for too long, the capacitors should be stored under the condition of packing in the demolition could not, not exposed to direct sunlight or the dust, generally should be at room temperature ( 10℃~30℃） Under the environment of preservation. Aluminum electrolytic capacitor stored by careful, safety capacitors, monolithic capacitors is relatively can be stored longer. Hope the above help, electrolytic capacitor manufacturers welcome consultation.
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