Package size of PCB

PCB packaging is mainly divided into SMD and plug-in type

1) SMD Component Package Description
LED: color has red, yellow, green, blue points, brightness divided Puliang, highlighting, super bright three and so on
Class, the commonly used package form has three types: 0805, 1206, 121 (commonly used package is rb.1/.2)

the extension is: 0805C, 0805D, 0805L, etc.            

Diode: According to the limit of the current withstand, the package form is broadly divided into two categories, small current type (such as 1N4148) package is 1206,

large current type (such as IN4007) does not have a specific package form, can only give a specific ruler inch: 5.5 x 3 x 0.5 capacitance: Can be divided into two types of nonpolar and polar, electrodeless capacitance the following two types of packages are most common, namely 0805, 0603, and polar capacitance is what we normally call electrolytic capacitors, usually we use the most aluminum electrolytic capacitors, because of their electrolyte is aluminum, so its temperature stability and accuracy are not very high, and paste

Chip components due to its close to the circuit version, so the requirement of high temperature stability, so the chip capacitor to the tantalum capacitor as much,
According to its pressure difference, the chip capacitor can be divided into a, B, C, D four series, the specific classification as follows:

3528

type	Package Form  < /td>	Withstand voltage
A	3216	10V
B	16V
C	6032	25V
D	7343	35V

Dial switch, crystal oscillator: In the market can find different specifications of the SMD package, its performance price will be based on their PIN plating
The nominal frequency and the segment are associated.
Resistance: Similar to the polar capacitance, the most common is 0805, 6,032 classes, the difference is that she can be the identity of the exclusion of the presence,
Four-bit, eight-bit, the specific package style can refer to MD16 emulation version, or to
Design the internal PCB library query.
Note:
A\b\c\d four type of package in the form of its specific size, in the form of L x S x H
1210 The exact size is the same as the electrolytic capacitor class B 3528 type
0805 Specific Size: 2.0 x 1.25 x 0.5
1206 Specific Size: 3.0 X 1.5 0X 0.5
Fixed resistors are commonly used in the packaging model "axial" series, including "AXIAL-0.3", "AXIAL-0.4" "AXIAL-0.5",
"AXIAL-0.6", "AXIAL-0.7", "AXIAL-0.8", "AXIAL-0.9" and "AXIAL-1.0", etc., the suffix
The number represents the spacing of two pads in the package model, in inches (1 inch =1000mil=2.54cm). SMD Resistor Package
Model 0805 refers to the 80mil*50mil.

The encapsulation model of the electrodeless capacitance is RAD series, e.g. "RAD-0.1" "RAD-0.2" "RAD-0.3" "Rad
-0.4 "and so on, the suffix number indicates the distance between two pads in the package model, in units of" inches ". Electrolysis
The capacitor package model is the RB series, for example from "rb-.2/.4" to "rb-.5/.10", with the first
The number represents the distance between two pads in the package model, and the second number represents the size of the capacitance form, in units "
Inch ".
(2) IC chip packaging form effect does not affect performance?
As we all know, IC chip packaging SMD and double-row in the sub-type. It is generally believed that the difference between SMD and double-row is mainly
It is different in volume and welding method, which has little effect on system performance. actually otherwise
Every trace on the PCB has an antenna effect. Each component on the PCB also has an antenna effect, the larger the conductive part of the component, the day
The stronger the line effect. Therefore, the same type of chip, package size is smaller than the package size of large
The antenna effect is weak. This explains a phenomenon that many engineers have noticed: the same device, the use of SMD components than the use of dual
Inline components are easier to pass through EMC testing.
In addition, the antenna effect is related to the working current loop of each chip. To weaken the antenna effect, in addition to reducing the package size, you should try to
Reduce operating current loop size, reduce operating frequency and di/dt. Pay attention to the latest type of IC chip (especially the single chip) of the pin cloth
The Bureau will find that most of them abandon traditional methods-the lower-left corner is VCC at the upper-right corner of GND, and VCC and Gnd are arranged in adjacent locations
is to reduce the working current loop size.
In fact, not only the IC chip, the resistor, the capacitor package is also related to EMC. Better EMC performance with 0805 package than 1206 seal, with
The 0603 package also has better EMC performance than the 0805 seal. The current international popularity is the 0603 package.

(3) Protel Component Packaging Summary
Part encapsulation refers to the appearance and position of the solder joint that the actual part is soldered to the board. is a purely spatial concept. So the different
The components can be shared in the same 10-piece package, and the same components can be packaged in different parts. Like resistors, there is a traditional pin type, this element body
Larger, the circuit board must be drilled to place the components, after drilling, insert components, then tin furnace or spray tin (also can be welding), into
The higher, newer design is the small size of the surface SMD Element (SMD) This element does not have to drill, with a steel film will be semi-fused
Solder paste into the circuit board, and then put the SMD components on the circuit board can be welded.

resistor axial
electrodeless capacitance RAD
Electrolytic Capacitor rb-
potentiometer VR
Diode DIODE
Transistor to
Power Regulator blocks 78 and 79 series to-126h and to-126v
the FET is the same as the transistor .
Rectifier Bridge D-44 D-37 D-46
single row multi-pin receptacle CON SIP
Dual Inline Element DIP
Crystal oscillator XTAL1
Resistance: RES1,RES2,RES3,RES4; Package property is Axial series
nonpolar capacitance: cap; package properties are RAD-0.1 through rad-0.4
electrolytic Capacitor: electroi; package properties are rb.2/.4 to rb.5/1.0
potentiometer: Pot1,pot2; package properties vr-1 to Vr-5
Diode: Package property is diode-0.4 (Low power) diode-0.7 (high power)
transistor: Common Encapsulation property is to-18 (ordinary transistor) To-22 (high power transistor) To-3 (High power Darlington)

power supply voltage regulator block with 78 and 79 series, 78 series such as 7805,7812,7820, etc.
79 Series with 7905,7912,7920, etc.
Common encapsulation properties are to126h and to126v
Rectifier Bridge: Bridge1,bridge2: Package attribute is D series (d-44,d-37,d-46)
Resistance: axial0.3-axial0.7 which 0.4-0.7 refers to the length of the resistor, generally used AXIAL0.4

Porcelain chip capacitance: rad0.1-rad0.3. Wherein 0.1-0.3 refers to the capacitance size, generally with RAD0.1
electrolytic capacitance: rb.1/.2-rb.4/.8 which. 1/.2-.4/.8 refers to the capacitance size. For General <100uf
rb.1/.2,100uf-470uf with rb.2/.4,>470uf with rb.3/.6
diode: diode0.4-diode0.7 wherein 0.4-0.7 refers to the length of the diode, generally with DIODE0.4

Light Emitting diode: rb.1/.2
Integration block: DIP8-DIP40, where 8-40 refers to how many feet, 8 feet is DIP8
SMD Resistor: 0603 indicates that the package size is not related to the specific resistance, but the package size and power are usually

0201 1/20w
0402 1/16w
0603 1/10w
0805 1/8w
1206 1/4W
The corresponding relationship between the dimensions of the capacitance resistor 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
In the case of part encapsulation, in addition to the components in the DEVICE.LIB library, the components of other libraries already have a fixed component package, because this
The components in a library come in many forms: as an example of transistors: transistors are one of the components we use in device. Lib
Library, simple only NPN and PnP points, but in fact, if it is NPN N3055 that it may be the TO-3 of the iron shell, such as
It is the 2n3054 of the NPN, it may be the iron shell of the TO-66 or TO-5, and the learning CS9013, there are to-92a,to-92b, and TO-5,
To-46,to-52 and so on, ever changing. Another is the resistor, in the device library, it is also simply referred to as RES1 and RES2,
Regardless of whether it is 100ω or 470kω, it is not related to the Ohm number in the circuit board, it is completely based on the power of the resistor
Our choice of 1/4w and even 1/2w resistors, can be encapsulated with AXIAL0.3 components, and the power of a large number of words, usable AXIAL0.4,
AXIAL0.5 and so on. The commonly used components are now packaged as follows:

axial0.3-axial1.0 of resistive and nonpolar double-ended components
electrodeless capacitance rad0.1-rad0.4
Polar capacitance 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 resistors (POT1, POT2) VR1-VR5
Of course, we can also open the library under the installation disk to find the corresponding package of the parts used. These component seals
You can split it into two parts to remember as resistance AXIAL0.3 can be disassembled into axial and 0.3,axial translated into
The Chinese is axial, and 0.3 is the distance between the solder pads on the PCB, which is 300mil (because
In the field of electrical machinery, is based on imperial units. In the same way, for a capacitor with no polarity, rad0.1-rad0.4
The same is true for polar capacitors such as electrolytic capacitors, which are encapsulated in rb.2/.4,rb.3/.6, etc., where ". 2"
For pad spacing, ". 4" is the outer diameter of the capacitor cylinder. For transistors, look directly at its shape and power,
High-power transistors, using TO-3, medium power transistors, if flat, use TO-220, if
is a metal shell, with TO-66, small power transistor, with to-5,to-46,to-92a and so on can, anti-
It also has long legs and can bend a bit. For the commonly used integrated IC circuit, there is a dipxx, is the double-row direct plug
Component package, DIP8 is a double row, each row has 4 pins, the distance between the two rows is 300mil, the distance between the pads is
100mil. Sipxx is a single-row package. Wait a minute. It is worth noting that transistors and variable resistors, which
Packaging is the most headache, the same packaging, its pins may not necessarily the same. For example, for the to-92b
Class of packaging, usually 1 feet e (emitter), and 2 feet may be B-pole (base), or C (set
electrodes); Similarly, 3 feet can be C, or B, specifically, the only thing that gets the component
Are you sure. Therefore, the circuit software is not hard to define the pad name (pin name), the same, FET, MOS
Tubes can also be packaged in a transistor-like package, which can be used on three-pin components.

Package size of PCB