Ref No. WU-RP-0277Sumitomo gold bonding wireEngineering Report[Electrical Properties of Gold Bonding Wire]Fusing down current Current vs Wire diameterCurrent vs Wire lengthCurrent vs Fsing down timeElectric resistivity measurementAnnealing temperature vs resistivityWire diameter vs resistivityElectrical resistivity and Self-inductanceSUMITOMO METAL MINING CO., LTD.ELECTRONICS DIVISION 1-6-1, SUEHIRO-CHO, OME-SHI, TOKYO, 198 JAPAN TEL NO. 0428(31)-4232 (DIRECT LINE) FAX NO. 0428(31)-9849MEMMALAYSIAN ELECTRONICS MATERIALS SDN. BHD.(The Subsidary of Sumitomo Metal Mining Co., Ltd.)Lots7&9,JalanRagum15/17,40200ShahAlam,SelangorDarulEhsan, MalaysiaTel: 03-5598302 Fax: 03-5598305SUMITOMO METAL MININGSMMGold wire fusing down current(Current vs Wire diameter)[Measuring condition]1) Apparatus DC Amperemeter (YEW Type 2011) DC power supplier (Model PAC35-5)2) Length of specimen 10.0 mm (0.394 inches)Wire diameter / umMeasured diameter / umFusing down current / AStandard deviationWire diameter / umMeasured diameter / umFusing down current / AStandard deviation152023253015.120.523.425.430.70.2800.4000.4600.5130.30.0100.0100.0100.0060.006333840537033.638.440.153.270.00.7330.8570.8701.2701.6900.0120.0120.0000.0100.01021.5Current / A10.5I (A) = -0.143 + 0.0261 * Dia. (um)0020ex. 1.0 mil wire I = -0.143 + 0.0261 * 25.4 (um) = 0.520 (A)406080Wire diameter / umSUMITOMO METAL MININGSMMGold wire fusing down current(Current vs Wire length)[Measuring condition]1) Apparatus DC Amperemeter (Digital multimeter TR6840 : Takeda riken) DC power supplier (San Rex DC AUTO 1510E : Sansya Electric)2) Wire diameter : 30 umLength (mm)MeanStd. Dev.Max.Min.48.930.6250.00870.6370.61129.670.6160.00430.6230.61111.400.6560.00470.660.96.620.7020.00870.7130.6933.410.8220.01210.8360.8031.281.2790.12711.5131.1331.5Current / A10.501020304050Wire length / mmSUMITOMO METAL MININGSMMGold wire fusing down current(Current vs fusing down time)[Measuring condition]1) Apparatus DC power supplier (San Rex DC AUTO 1510E : Sansya Electric)2) Wire diameter : 30 um10080 mil100 milFusing down time / m sec102.5 mm :t=274×e−1.66×I2.0 mm :t=135×e−1.57×I111.522.5Current / APower supplyCurrent/ A1.01.11.21.31.41.51.61.71.81.92.02.12.22.380 mil/ m sec.--------9.07.05.04.54.54.0100 mil/ m sec.-----30.017.014.513.011.09.58.57.56.5SwitchOsciloscopeGold wireWeight 0.65 gGold plate 2.3*2.3, th0.08Gold wire 1.3 milAluminum plateth 0.0280 mil100 milGlass plateSUMITOMO METAL MININGSMMElectrical resistivity[Measuring condition]1) Apparatus Ohmmeter (YEW Type 2769) Double bridge method is applied2) Sample : SGA(3)-SH Length : 500 mm (19.7 inches)Wire diameterResistance (ohm) No. 1 No. 2 No. 3 No. 4 No. 5Resistance mean value Resistivity in 1 m (Ω/m)Specific resistivity (μΩ･cm)cm)28 um18.818.818.818.818.818.8037.62.3230 um16.516.516.516.516.516.5033.02.3332 um14.114.014.014.114.114.0628.12.26Mean value of specific resistivity = 2.30(μΩ･Electrical resistivity / Ohm (Sample length : 500 m222018161412102628303234Wire diameter / umLSR=ρ25×[1+α(T−25)]×=2.30×10−6×[1+0.0040(100−25)]×LSR : Electric resistivity (Ω) T : Temperature (oC) α : Coefficient of temperature ρ : Specific resistivity (Ω⋅cm) L : Sample length (cm) S : Cross section area (cm2)SUMITOMO METAL MININGSMMElectric resistivity measurement[Measuring condition]1) Apparatus Ohmmeter (YEW Type 2769) Double bridge method is applied2) Sample : SGA(3)-SH 106 um Length : 500 mm (19.7 inches) Temperature : 21'C402.68Tensile strengthTensile strength / Kg/m , Elongation / %2.66302.Electrical resistivity2.622.6202102.582.56Elongation001002003004005002.54Annealing temperature / 'CSample wire is heated in the furnace at certen temperature for 60 mimutes. In electrical conductivity, tensile strength and elongation, five times of measurements are conducted in each temperature.As the garain growth by heating, electrical resistivity decrease about 4%.SUMITOMO METAL MININGSMMElectrical resistivity and Self-InductanceR=ρ⋅lSμ⋅l⎛2l3⎞−1L=⎜log−⎟ KKKK Self−inductance（H⋅m）2π⎝R4⎠=ρ⋅l KKKK Resistance（Ω）2π⋅r ρ ：Specific resistivity (Au : 2.35×10−8Ω⋅m) l ：Wire length (m) S ：Wire cross section area (m2) r ：Wire radious (m) μ ：Magnetic permeability (Au : 0.999965×4π×10−7)Electric resistivity0.15Self-Inductance0.12.52.1Wire length 1.5 mmWire length 2.0 mmWire length 1.5 mmElectric resistivity / OhmWire length 2.0 mm0.0921.90.10.080.07Self-Inductance / nH21.81.70.050.060.051.51.61.51.40202530350.041202530351.3Wire diameter / umWire diameter / umHowever, in case of high frequency working, the electric currents transfer through the wire surface region. And electric resistivity and self-inductance becomes higher in comparison with this calculated value.SUMITOMO METAL MININGSMMＡｕワイヤー溶断電流（溶断電流 vs 試料長さ）[測定条件]1) 装置 直流電流計 (Digital multimeter TR6840 : Takeda riken) 直流電源 (San Rex DC AUTO 1510E : Sansya Electric)2) 試料線径： ２０μｍ試料長さ(mm)平均標準偏差最大値最小値48.930.30.00870.3960.38029.670.3830.00430.3880.38011.400.4080.00470.4110.4046.620.4370.00870.4430.4313.410.5110.01210.5200.4991.280.7960.12710.9410.7051.5溶断電流／Ａ1Max.Min.0.5001020304050試料長さ／ｍｍSUMITOMO METAL MININGSMMGold wire fusing down time(Time vs Current)Fusing down time / ms1.00E+41.00E+31.00E+21.00E+11.00E+00.30.420μｍφSGA(3) 4NHG-2 2N0.50.60.70.80.911.11.2Fusing down current / A Temperature of wire break point is determined by Joule's heat and radiation by wire and air. And its temperature continues to rise up to melting point by Joule's heat which is raised by increased electric resistance in proportion to absolute temperature . As the heat generation rate is faster than radiation rate, the wire with higer specific resistance takes shorter time to reach melting point and its fuging current becomes smaller. Under balancing between Joule's heat and radiation rate, difference of electric resistance between 2N and 4N can be ignored in comparison with quantity of heat generation. And the difference of melting point between our 4N and 2N wire is below 10℃. So fusing current of 2N wire is almost same with 4N wire. By the way, reading of 2N-1mil is 0.518A and its of 4N-1mil is 0.521A. SUMITOMO METAL MININGSMM
