SMT零件識別

　　一 電阻(Resistor):

　　SMT 電阻一般而言, 其常用之外型尺寸有以下數(shù)種規(guī)格:

　　Generally, the SMT resistor dimension of common using is following 3 types:

　　注:公制與英制間之單位換算會有些許誤差, 且各家廠商之產(chǎn)品間亦有少許差異, 因此上述之尺寸數(shù)據(jù)為概略值。There will be little of bias when we converse mm to inch. Different vendor will make little of dimension. Above table is estimate dimension.

　　SMT 電阻的阻值可直接由電阻上之?dāng)?shù)字計算出來:

　　The resistor value can be read by marking on resistor surface:

　　(1) 一般電阻: 其阻值以3碼標(biāo)示。單位為奧姆(ohm; Ω), 以下為例:

　　Normal resistor: Using 3 digital to represent resistor value:

　　*若電阻標(biāo)示為203, 則其阻值之計算方式為

　　If the digital is “203”, then the resistor value is:

　　20x103 = 20000 ohm = 20K ohm

　　*若電阻標(biāo)示為351, 則其阻值之計算方式為

　　If the digital is “351”, then the resistor value is:

　　35x101 = 35 ohm

　　*若電阻標(biāo)示為050, 則其阻值之計算方式為

　　If the digital is “050”, then the resistor value is:

　　05x100 = 5 ohm

　　(2)精密電阻: 其阻值以4碼標(biāo)示。單位為奧姆(ohm; Ω), 以下為例:

　　Precise resistor: Using 4 digital to represent resistor value:

　　若電阻標(biāo)示為1203, 則其阻值之計算方式為:

　　If the digital is “1203”, then the resistor value is:

　　120x103 = 120000 ohm = 120K ohm

　　若電阻標(biāo)示為1301, 則其阻值之計算方式為:

　　If the digital is “1301”, then the resistor value is:

　　130x101 = 130 ohm

　　若電阻標(biāo)示為0500, 則其阻值之計算方式為:

　　If the digital is “0050”, then the resistor value is:

　　050x100 = 50 ohm

　　(3) 0 奧姆電阻, 其阻值之標(biāo)示為0:

　　0 ohm is represented as below:

　　(4) 電阻標(biāo)示中若有”R”, 表示阻值中有小數(shù)點:

　　Letter “R” means dot as below:

　　5R6 = 5.6 ohm

　　二 電容 (Capacitor):

　　SMT 電容之外型尺寸與電阻相同, 常用之外型尺寸有以下數(shù)種規(guī)格:

　　SMT capacitor dimension is same as resistor, the dimension of common using is as below:
 

　　SMT 電容在外觀上無法辨別其電容值, 需以電容表量測。

　　Capacity value can’t show on the capacitor surface, it should be measured by meter.

　　三 IC:

　　(1) 名詞解釋(Definition):

　　Pin: IC 腳 (又稱lead)。

　　Pin: IC lead.

　　Pitch: Pin的中心點到相鄰Pin的中心點之距離。

　　Pitch: Distance between pin center to next pin center.

　　(2) 外觀分類(IC package type):

　　2.1 SOP(Small Outline Package): IC腳位于本體兩側(cè), 呈L型向外延伸。

　　SOP(Small Outline Package): IC leads are L-shape and locate in 2 side of body.