關于PCB封裝的資料收集整理. 大的來說,元件有插裝和貼裝.零件封裝是指實際零件焊接到電路板時所指示的外觀和焊點的位置。是純粹的空間概念.因此不同的元件可共用同一零件封裝，同種元件也可有不同的零件封裝。像電阻，有傳統的針插式，這種元件體積較大，電路板必須鉆孔才能安置元件，完成鉆孔后，插入元件，再過錫爐或噴錫（也可手焊），成本較高，較新的設計都是采用體積小的表面貼片式元件（SMD）這種元件不必鉆孔，用鋼膜將半熔狀錫膏倒入電路板，再把SMD 元件放上，即可焊接在電路板上了。晶體管是我們常用的的元件之一，在DEVICE。LIB庫中，簡簡單單的只有NPN與PNP之分，但實際上，如果它是NPN的2N3055那它有可能是鐵殼子的TO—3，如果它是NPN的2N3054，則有可能是鐵殼的TO-66或TO-5，而學用的CS9013，有TO-92A，TO-92B，還有TO-5，TO-46，TO-52等等，千變萬化。還有一個就是電阻，在DEVICE 庫中，它也是簡單地把它們稱為RES1 和RES2，不管它是100Ω 還是470KΩ都一樣，對電路板而言，它與歐姆數根本不相關，完全是按該電阻的功率數來決定的我們選用的1/4W 和甚至1/2W 的電阻，都可以用AXIAL0.3 元件封裝，而功率數大一點的話，可用AXIAL0.4,AXIAL0.5等等?，F將常用的元件封裝整理如下：電阻類及無極性雙端元件：AXIAL0.3-AXIAL1.0無極性電容：RAD0.1-RAD0.4有極性電容：RB.2/.4-RB.5/1.0二極管：DIODE0.4及DIODE0.7石英晶體振蕩器：XTAL1晶體管、FET、UJT：TO-xxx(TO-3,TO-5)可變電阻（POT1、POT2）：VR1-VR5這些常用的元件封裝，大家最好能把它背下來，這些元件封裝，大家可以把它拆分成兩部分來記如電阻AXIAL0.3 可拆成AXIAL 和0.3，AXIAL 翻譯成中文就是軸狀的，0.3 則是該電阻在印刷電路板上的焊盤間的距離也就是300mil（因為在電機領域里，是以英制單位為主的。同樣的，對于無極性的電容，RAD0.1-RAD0.4也是一樣；對有極性的電容如電解電容，其封裝為RB.2/.4，RB.3/.6 等，其中“.2”為焊盤間距，“.4”為電容圓筒的外徑。對于晶體管，那就直接看它的外形及功率，大功率的晶體管，就用TO—3，中功率的晶體管，如果是扁平的，就用TO-220，如果是金屬殼的，就用TO-66，小功率的晶體管，就用TO-5，TO-46，TO-92A等都可以，反正它的管腳也長，彎一下也可以。對于常用的集成IC電路，有DIPxx，就是雙列直插的元件封裝，DIP8就是雙排，每排有4個引腳，兩排間距離是300mil,焊盤間的距離是100mil。SIPxx 就是單排的封裝。等等。值得我們注意的是晶體管與可變電阻，它們的包裝才是最令人頭痛的，同樣的包裝，其管腳可不一定一樣。例如，對于TO-92B之類的包裝，通常是1 腳為E（發射極），而2 腳有可能是B 極（基極），也可能是C（集電極）；同樣的，3腳有可能是C，也有可能是B，具體是那個，只有拿到了元件才能確定。因此，電路軟件不敢硬性定義焊盤名稱（管腳名稱），同樣的，場效應管，MOS 管也可以用跟晶體管一樣的封裝，它可以通用于三個引腳的元件。Q1-B，在PCB 里，加載這種網絡表的時候，就會找不到節點（對不上）。在可變電阻
上傳時間： 2013-11-03
上傳用戶：daguogai
The CAT25128 is a 128−Kb Serial CMOS EEPROM device internally organized as 16Kx8 bits. This features a 64−byte page write buffer and supports the Serial Peripheral Interface (SPI) protocol. The device is enabled through a Chip Select (CS) input. In addition, the required bus signals are clock input (SCK), data input (SI) and data output (SO) lines. The HOLD input may be used to pause any serial communication with the CAT25128 device. The device featuressoftware and hardware write protection, including partial as well as full array protection.
上傳時間： 2013-11-15
上傳用戶：fklinran
The CAT823, CAT824, and CAT825 provide basic reset and monitoring functions for the electronic systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer, after a minimum timer of 140ms; toallow the systems power supply to stabilize.
上傳時間： 2014-11-18
上傳用戶：BOBOniu
The PAM2862 is a continuous mode inductivestep-down converter, designed for driving singleor multiple series connected LEDs efficientlyfrom a voltage source higher than the LEDvoltage. The device operates from an inputupply between 6V and 30V and provides anexternally adjustable output current of up to 1A.Depending upon supply voltage and externalcomponents, this can provide up to 24 watts ofoutput power.
上傳時間： 2013-11-16
上傳用戶：司令部正軍級
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間： 2013-10-10
上傳用戶：inwins
The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallelInput/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed toenhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders providea simple solution when additional I/O is needed for ACPI power switches, sensors,push buttons, LEDs, fans, etc.
上傳時間： 2013-10-09
上傳用戶：731140412
The PCA9537 is a 10-pin CMOS device that provides 4 bits of General Purpose parallelInput/Output (GPIO) expansion with interrupt and reset for I2C-bus/SMBus applicationsand was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders.I/O expanders provide a simple solution when additional I/O is needed for ACPI powerswitches, sensors, push-buttons, LEDs, fans, etc.
上傳時間： 2013-10-14
上傳用戶：wuchunzhong
<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
標簽： oscillators X-tal bit mic
上傳時間： 2013-11-12
上傳用戶：穿著衣服的大衛
The PCA9538 is a 16-pin CMOS device that provides 8 bits of General Purpose parallelInput/Output (GPIO) expansion with interrupt and reset for I2C-bus/SMBus applicationsand was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders.I/O expanders provide a simple solution when additional I/O is needed for ACPI powerswitches, sensors, push-buttons, LEDs, fans, etc.
上傳時間： 2014-01-24
上傳用戶：youmo81
The PCA9539; PCA9539R is a 24-pin CMOS device that provides 16 bits of GeneralPurpose parallel Input/Output (GPIO) expansion with interrupt and reset forI2C-bus/SMBus applications and was developed to enhance the NXP Semiconductorsfamily of I2C-bus I/O expanders. I/O expanders provide a simple solution when additionalI/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間： 2013-11-10
上傳用戶：ewtrwrtwe
