A complete guide to Protel component packaging

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A complete guide to Protel component packaging [Copy link]

A complete guide to Protel component packaging

Parts package refers to the appearance and location of solder joints when the actual parts are soldered to the circuit board. It is a pure spatial concept . Therefore, different components can share the same parts package, and the same components can also have different parts packages. Like resistors, there are traditional pin-insertion types. This type of component is large in size, and the circuit board must be drilled to place the component. After drilling, the component is inserted, and then passed through a tin furnace or sprayed with tin (it can also be hand-soldered), which is costly. Newer designs all use small surface mount components ( SMD ). This type of component does not require drilling. Use a steel film to pour semi-molten solder paste into the circuit board, and then put the SMD component on it, and it can be soldered on the circuit board.

Resistor AXIAL

Non-polar capacitor RAD

Electrolytic capacitor RB-

Potentiometer VR

Diode

Transistor TO

Power Regulator 78 and 79 Series TO - 126H and TO-126V

Field effect tube is the same as triode

Rectifier bridge D－44 D－37 D－46

Single row multi-pin socket CON SIP

Dual in-line package DIP

Crystal oscillator XTAL1

Resistors: Package attributes are AXIAL series

Non-polarized capacitors: Package attributes are RAD-0.1 to RAD-0.4

Electrolytic capacitors: Package attributes range from RB.2/.4 to RB.5/1.0

Potentiometer: Package attributes are VR-1 to VR-5

Diode: Package attributes are DIODE-0.4 ( low power ) DIODE-0.7 ( high power )

Transistor: Common packaging properties are TO-18 (ordinary transistor) TO-22 ( high-power transistor ) TO-3 ( high-power Darlington tube )

The power regulator blocks include 78 and 79 series; 78 series include 7805 , 7812 , 7820 , etc. , 79 series include 7905 , 7912 , 7920 , etc. Common packaging attributes include TO126H and TO126V

Rectifier bridge: Package attributes are D series ( D-44 , D-37 , D-46 )

Resistor:　AXIAL0.3-AXIAL0.7　　, where 0.4-0.7 refers to the length of the resistor, AXIAL0.4 is generally used.

Ceramic capacitor: RAD0.1-RAD0.3　　, where 0.1-0.3 refers to the capacitance, and RAD0.1 is generally used.

Electrolytic capacitor: RB.1/.2-RB.4/.8 , where .1/.2-.4/.8 refers to the capacitance. Generally less than 100uF

RB.1/.2, 100uF-470uF use RB.2/.4, greater than 470uF use RB.3/.6

Diode:　DIODE0.4-DIODE0.7 , 0.4-0.7 refers to the length of the diode, generally DIODE0.4 is used

LED: RB.1/.2

Integrated block:　DIP8-DIP40, where 8-40 refers to the number of pins, 8-pin is DIP8

Chip resistors

0603 means the package size has nothing to do with the specific resistance value.

But package size is related to power. Generally speaking

0201 1/20W

0402 1/16W

0603 1/10W

0805 1/8W

1206 1/4W

The corresponding relationship between the capacitor and resistor dimensions and the package is :

0402=1.0x0.5

0603=1.6x0.8

0805=2.0x1.2

1206=3.2x1.6

1210=3.2x2.5

1812=4.5x3.2

2225=5.6x6.5

As for the parts package, we have mentioned before that, except for the components in the DEVICE.LIB library, the components in other libraries have fixed component packages. This is because the components in this library have various forms: take transistors as an example:

Transistor is one of the components we often use. In DEVICE.LIB library, there are only NPN and PNP . But in fact, if it is NPN 2N3055 , it may be TO - 3 with iron shell . If it is NPN 2N3054 , it may be TO-66 or TO-5 with iron shell . And the CS9013 we use has TO-92A , TO-92B , TO-5 , TO-46 , TO-52 , etc. There are many kinds of components. Another one is resistor. In DEVICE library , it is simply called RES1 and RES2 . It doesn't matter whether it is 100Ω or 470KΩ . For circuit board, it has nothing to do with ohm number. It is completely determined by the power number of the resistor. The 1/4W and even 1/2W resistors we choose can be packaged with AXIAL0.3 components. If the power number is larger, AXIAL0.4, AXIAL0.5, etc. can be used. The commonly used component packages are organized as follows:

Resistors and non-polar two-terminal components AXIAL0.3-AXIAL1.0

Non-polar capacitors RAD0.1-RAD0.4

Polarized capacitors RB.2/.4-RB.5/1.0

Diode DIODE0.4 and DIODE0.7

Quartz crystal oscillator XTAL1

Transistor, FET , UJT TO-xxx(TO-3,TO-5)

Variable resistor ( POT1 , POT2 ) VR1-VR5

It is best for everyone to memorize these commonly used component packages. These component packages can be split into two parts to remember. For example, the resistor AXIAL0.3 can be split into AXIAL and 0.3 . AXIAL is translated into Chinese as axial, and 0.3 is the distance between the pads of the resistor on the printed circuit board, which is 300mil (because in the field of motors, the imperial unit is the main unit). Similarly, for non-polar capacitors, RAD0.1-RAD0.4 is the same; for polar capacitors such as electrolytic capacitors, the package is RB.2/.4 , RB.3/.6 , etc., where " .2 " is the pad spacing and " .4 " is the outer diameter of the capacitor cylinder. For transistors, just look at its appearance and power. For high-power transistors, use TO - 3 . For medium-power transistors, if they are flat, use TO-220 . If they are metal shells, use TO-66 . For low-power transistors, use TO-5 , TO-46 , TO-92A and others are fine, since their pins are long and can be bent. For commonly used integrated IC circuits, there are DIPxx , which is a dual in-line component package, DIP8 is a double row, with 4 pins in each row, the distance between the two rows is 300mil, and the distance between the pads is 100mil . SIPxx is a single row package. And so on.

It is worth noting that transistors and variable resistors are the most troublesome in terms of packaging. The same packaging may not have the same pins. For example, for packaging such as TO-92B , pin 1 is usually E (emitter), while pin 2 may be B (base) or C (collector); similarly, pin 3 may be C or B. The specific one can only be determined after the component is obtained. Therefore, the circuit software dare not rigidly define the pad name (pin name). Similarly, field effect transistors and MOS tubes can also use the same package as transistors, which can be used for components with three pins. Q1-B , in the PCB , when loading this network table, the node will not be found (cannot match). Similar problems will also occur on variable resistors; in the schematic diagram, the pins of the variable resistor are 1 , W , and 2 respectively , and the generated network table is 1 , 2 , and W. In the PCB circuit board, the pads are 1 , 2 , and 3 . When these two components are present in the circuit, the difference between PCB and SCH needs to be modified . The fastest way is to change the transistor pins to 1 , 2 , 3 directly in the network table after generating the network table ; and change the variable resistor to 1 , 2 , 3 with the same appearance as the circuit board components .

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