ST 2SC945 NPN Silicon Epitaxial Planar Transistor for switching and AF amplifier applications. The transistor is subdivided into five groups, R, O, Y, P and L, according to its DC current gain. As complementary type the PNP transistor ST 2SA733 is recommended. On special request, these transistors can be manufactured in different pin configurations. TO-92 Plastic Package Weight approx. 0.19g Absolute Maximum Ratings (Ta = 25℃) Symbol Value Unit Collector Base Voltage VCBO 60 V Collector Emitter Voltage VCEO 50 V Emitter Base Voltage VEBO 5 V Collector Current IC 150 mA Power Dissipation Ptot 250 mW Junction Temperature Tj 150 O Storage Temperature Range TS -55 to +150 O C C SEMTECH ELECTRONICS LTD. (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) ® Dated : 22/07/2004 ST 2SC945 Characteristics at Tamb=25 OC Symbol Min. Typ. Max. Unit Current Gain Group R hFE 40 - 80 - O hFE 70 - 140 - Y hFE 120 - 240 - P hFE 200 - 400 - L hFE 350 - 700 - V(BR)CBO 60 - - V V(BR)CEO 50 - - V V(BR)EBO 5 - - V ICBO - - 0.1 μA IEBO - - 0.1 μA VCE(sat) - 0.15 0.3 V fT - 300 - MHz COB - 2.5 - pF NF - 4 - dB DC Current Gain at VCE=6V, IC=1mA Collector Base Breakdown Voltage at IC=100μA Collector Emitter Breakdown Voltage at IC=10mA Emitter Base Breakdown Voltage at IE=10μA Collector Cutoff Current at VCB=40V Emitter Cutoff Current at VEB=3V Collector Saturation Voltage at IC=100mA, IB=10mA Gain Bandwidth Product at VCE=6V, IC=10mA Output Capacitance at VCB=6V, f=1MHz Noise Figure at VCE=6V, IE=0.5mA at f=1KHz, RS=500Ω SEMTECH ELECTRONICS LTD. (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) ® Dated : 22/07/2004 ST 2SC945 Total power dissipation vs. ambient temperature Normalized collector cutoff current vs. ambient temperature 300 P tot (mW) 250 200 150 100 50 0 50 25 75 150 125 100 I CBO(Ta) Normalized collector cutoff current I CBO(Ta=25 C) 10000 Free air 1000 100 10 1 0 20 40 100 120 140 80 60 160 Tamb ( C) Tamb ( C) Collector current vs. collector emitter voltage Collector current vs. collector emitter voltage 1.0 0.9 0.8 0.7 0.6 0.5 100 80 10 4.5 4 8 3.5 0.4 3 6 0.3 Ic - mA Ic - mA 60 40 0.2 2.5 2 4 1.5 1 20 2 I B =0.1mA 0 0 0.4 1.2 0.8 1.6 0 0 2.0 IB=0.5 A 10 30 20 VCE, V 40 50 VCE, V h FE - I C h FE - I C 360 360 pulse d 320 320 280 280 VCE=6V pulsed VCE=6.0V 200 160 3.0V 120 2.0V 80 1.0V 0.5V 40 DC CURRENT GAIN DC CURRENT GAIN Ta=75 C 240 240 200 25 C 160 120 -25 C 80 40 0 0 0.01 0.1 1 10 100 0.01 COLLECTOR CURRENT, mA 0.1 1 10 100 COLLECTOR CURRENT, mA SEMTECH ELECTRONICS LTD. (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) ® Dated : 22/07/2004 ST 2SC945 Collector current vs. base emitter voltage Normalized h-parameters vs. collector current 100 10 VCE=6V pulsed He= Normalized h-parameters 1 -25 C Ta= 25 C 75 C 10 Ic - mA VCE=6V f=1kHz Hie 0.1 Hre he(Ic) he(Ic=1mA) Hoe Hfe 1 Hfe Hoe Hre Hie 0.01 0.2 0.4 0.3 0.5 0.6 0.7 0.9 0.8 0.1 0.1 1 10 1 Ic , VBE , V mA Collector and base saturation fT - I E voltage vs. collector current 10 10000 1 IC/IB=10 VBE(sat) 1000 20 50 50 VCE(sat) 0.1 20 fT - MHz VBE(sat) , V VCE(sat) , V pulsed VCE=10V 6V 100 2V 1V IC/IB=10 0.01 0.1 1 10 10 100 -0.1 -1 Emitter Current, mA Collector Current, mA Small signal current gain vs. DC current gain VEB, VCB vs. Cib, Cob 1000 100 VCE=6V Ic=1mA f=1kHz Small signal current gain f=1MHz Cib(Ic=0) Cib, Cob - pF -100 -10 10 Cob(IE=0) 1 0.1 0.1 1 10 100 800 600 400 200 0 200 VEB, VCB - V 400 600 800 1000 DC current gain SEMTECH ELECTRONICS LTD. (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) ® Dated : 22/07/2004 80 60 40 20 0 50 40 30 20 10 0 VCE=6V Ic=1mA f=1kHz 40 30 hoe hre hie 20 10 0 200 400 600 800 Normalized h-parameters vs. collector emitter voltage 3 Normalized h- parameters hoe - Output admittance ( s) 100 Input impedance, voltage feedback ratio and output admittance vs. small signal current gain 50 hie - Input impedance(k ) hre - Voltage feedback ratio (x10 -4 ) ST 2SC945 1000 hfe - Small signal current gain Ic=1mA f=1kHz he(VCE) He= he(VCE=6V) 2 hoe hre hfe 1 hre hoe hfe 0 hie hie 20 10 VCE - V SEMTECH ELECTRONICS LTD. (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) ® Dated : 22/07/2004 30