source:Industry News release time:2022-04-09 Article author:sznbone Popular:pcb
For most electronic components, common discrete component packages mainly include diodes, capacitors, resistors, and transistors; common integrated circuits include single-in-line and dual-in-line.
Diodes: Diode-type components are generally packaged with the number DIODE-xx, where the number xx represents the distance between the diode-type components’ pins. For example, a component package number of DIODE-0.5 means that the distance between component pins is 500mil.
Capacitive: Capacitive component packages can be divided into two categories, which are non-polar capacitors and polar capacitors. The package number of non-polar capacitive components is RADxx, where the number xx represents the distance between the pins of the component package; the number of the polar capacitive component package is RBxx-yy, where the number xx represents the distance between the component pins, and the number yy Indicates the diameter of the element.
Resistors: Resistive component packages can also be divided into two categories, which are ordinary resistors and variable resistors. The package number of ordinary resistance components is AXIAL-xx, where the number xx represents the distance between the component pins; the number of the variable resistance component package is VRx, where the number x represents the category of the component.
Integrated circuits: the serial number of the single in-line component package is SIL-xx, where the number xx represents the number of pins of the single in-line integrated circuit; the number of the dual in-line component package is DIP-xx, where the number xx represents The pin count of the dual in-line integrated circuit.
Components of component packaging
To form a package of components, three main elements should be paid attention to:
1) Pads - used to fix the device to the circuit board and connect signals with other devices through wires. We need to draw the shape, location and number of the pad according to the data sheet, and the number corresponds to the pin of the device serial number;
2) Outline - the outline of the component package is to tell the designer the area occupied by the device, and no device can be placed within the outline, otherwise it will lead to conflict;
3) Silkscreen annotation - we need to mark the key information of the device through silkscreen, such as which pin is the starting pin? Device polarity, orientation, etc.
In addition to the above three major elements, most CAD software has added 3D data. According to these data, the designer can know the three-dimensional shape of the device, which is very important in the design of mechatronics.
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