Order this document by BUH51/D SEMICONDUCTOR TECHNICAL DATA POWER TRANSISTOR 3 AMPERES 800 VOLTS 50 WATTS The BUH51 has an application specific state-of-art die designed for use in 50 Watts Halogen electronic transformers. This power transistor is specifically designed to sustain the large inrush current during either the start-up conditions or under a short circuit across the load. This High voltage/High speed product exhibits the following main features: * Improved Efficiency Due to the Low Base Drive Requirements: -- High and Flat DC Current Gain hFE -- Fast Switching * Robustness Thanks to the Technology Developed to Manufacture this Device * Motorola "6 SIGMA" Philosophy Providing Tight and Reproducible Parametric Distributions IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII IIIII IIIIII IIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII IIIII IIIIII IIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII IIIII IIIIII IIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII CASE 77-07 TO-225AA TYPE MAXIMUM RATINGS Symbol Value Unit Collector-Emitter Sustaining Voltage Rating VCEO 500 Vdc Collector-Base Breakdown Voltage VCBO 800 Vdc Collector-Emitter Breakdown Voltage VCES 800 Vdc Emitter-Base Voltage VEBO 10 Vdc Collector Current -- Continuous -- Peak (1) IC ICM 3 8 Adc Base Current -- Continuous Base Current -- Peak (1) IB IBM 2 4 Adc *Total Device Dissipation @ TC = 25_C *Derate above 25C PD 50 0.4 Watt W/_C TJ, Tstg - 65 to 150 _C RJC RJA 2.5 100 TL 260 Operating and Storage Temperature THERMAL CHARACTERISTICS Thermal Resistance -- Junction to Case -- Junction to Ambient Maximum Lead Temperature for Soldering Purposes: 1/8 from case for 5 seconds _C/W _C (1) Pulse Test: Pulse Width = 5 ms, Duty Cycle 10%. Designer's and SWITCHMODE are trademarks of Motorola, Inc. This document contains information on a new product. Specifications and information herein are subject to change without notice. Motorola, Inc. 1995 Motorola Bipolar Power Transistor Device Data 1 BUH51 IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ELECTRICAL CHARACTERISTICS (TC = 25C unless otherwise noted) Characteristic Symbol Min Typ Max Unit Collector-Emitter Sustaining Voltage (IC = 100 mA, L = 25 mH) VCEO(sus) 500 550 Vdc Collector-Base Breakdown Voltage (ICBO = 1 mA) VCBO 800 950 Vdc Emitter-Base Breakdown Voltage (IEBO = 1 mA) VEBO 10 12.5 Vdc Collector Cutoff Current (VCE = Rated VCEO, IB = 0) ICEO 100 Adc OFF CHARACTERISTICS Collector Cutoff Current (VCE = Rated VCES, VEB = 0) @ TC = 25C @ TC = 125C ICES 100 1000 Adc Collector Base Current (VCB = Rated VCBO, VEB = 0) @ TC = 25C @ TC = 125C ICBO 100 1000 Adc IEBO 100 Adc Emitter-Cutoff Current (VEB = 9 Vdc, IC = 0) ON CHARACTERISTICS Base-Emitter Saturation Voltage (IC = 1 Adc, IB = 0.2 Adc) @ TC = 25C @ TC = 125C VBE(sat) 0.92 0.8 1.1 Vdc Collector-Emitter Saturation Voltage (IC = 1 Adc, IB = 0.2 Adc) @ TC = 25C @ TC = 125C VCE(sat) 0.3 0.32 0.5 0.6 Vdc DC Current Gain (IC = 1 Adc, VCE = 1 Vdc) @ TC = 25C @ TC = 125C hFE DC Current Gain (IC = 2 Adc, VCE = 5 Vdc) 8 6 10 8 @ TC = 25C @ TC = 125C 5 4 7.5 6.2 -- DC Current Gain (IC = 0.8 Adc, VCE = 5 Vdc) @ TC = 25C @ TC = 125C 10 8 14 13 -- DC Current Gain (IC = 10 mAdc, VCE = 5 Vdc) @ TC = 25C @ TC = 125C 14 18 20 25 -- 1.7 V -- DYNAMIC SATURATION VOLTAGE VCE(dsat) IC = 1 Adc, IB1 = 0.2 Adc VCC = 300 V @ TC = 25C @ TC = 125C 6 V IC = 2 Adc, IB1 = 0.4 Adc VCC = 300 V @ TC = 25C 5.1 V @ TC = 125C 15 V fT 23 MHz Output Capacitance (VCB = 10 Vdc, IE = 0, f = 1 MHz) Cob 34 100 pF Input Capacitance (VEB = 8 Vdc, f = 1 MHz) Cib 200 500 pF Dynamic Saturation Voltage: Determined 3 s after rising IB1 reaches 90% of final IB1 DYNAMIC CHARACTERISTICS Current Gain Bandwidth (IC = 1 Adc, VCE = 10 Vdc, f = 1 MHz) 2 Motorola Bipolar Power Transistor Device Data BUH51 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIII IIIIII IIII IIII IIII III IIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ELECTRICAL CHARACTERISTICS (TC = 25C unless otherwise noted) Characteristic Symbol Min Typ Max Unit SWITCHING CHARACTERISTICS: Resistive Load (D.C. 10%, Pulse Width = 40 s) Turn-on Time IC = 1 Adc, IB1 = 0.2 Adc IB2 = 0.2 Adc VCC = 300 Vdc Turn-off Time Turn-on Time IC = 2 Adc, IB1 = 0.4 Adc IB2 = 0.4 Adc VCC = 300 Vdc Turn-off Time @ TC = 25C @ TC = 125C ton 110 125 150 ns @ TC = 25C @ TC = 125C toff 3.5 4.1 4 s @ TC = 25C @ TC = 125C ton 700 1250 1000 ns @ TC = 25C @ TC = 125C toff 1.75 2.1 2 s SWITCHING CHARACTERISTICS: Inductive Load (Vclamp = 300 V, VCC = 15 V, L = 200 H) Fall Time @ TC = 25C @ TC = 125C tfi 200 320 300 ns @ TC = 25C @ TC = 125C tsi 3.4 4 3.75 s Crossover Time @ TC = 25C @ TC = 125C tc 350 640 500 ns Fall Time @ TC = 25C @ TC = 125C tfi 140 300 200 ns @ TC = 25C @ TC = 125C tsi 2.3 2.8 2.75 s @ TC = 25C @ TC = 125C tc 400 725 600 ns IC = 1 Adc IB1 = 0.2 Adc IB2 = 0.2 Adc Storage Time IC = 2 Adc IB1 = 0.4 Adc IB2 = 0.4 Adc Storage Time Crossover Time TYPICAL STATIC CHARACTERISTICS 100 100 VCE = 3 V hFE , DC CURRENT GAIN hFE , DC CURRENT GAIN VCE = 1 V TJ = 125C 10 TJ = - 20C 1 0.001 TJ = 25C 0.01 0.1 1 IC, COLLECTOR CURRENT (AMPS) Figure 1. DC Current Gain @ 1 Volt Motorola Bipolar Power Transistor Device Data 10 TJ = 125C 10 TJ = - 20C 1 0.001 TJ = 25C 0.01 0.1 1 IC, COLLECTOR CURRENT (AMPS) 10 Figure 2. DC Current Gain @ 3 Volt 3 BUH51 TYPICAL STATIC CHARACTERISTICS 100 10 IC/IB = 5 VCE , VOLTAGE (VOLTS) hFE , DC CURRENT GAIN VCE = 5 V TJ = 125C 10 TJ = - 20C 1 0.001 TJ = 25C 0.01 0.1 1 IC, COLLECTOR CURRENT (AMPS) TJ = 125C 1 TJ = 25C TJ = - 20C 0.1 0.01 0.001 10 Figure 3. DC Current Gain @ 5 Volt 10 Figure 4. Collector-Emitter Saturation Voltage 10 1.5 IC/IB = 5 1 VBE , VOLTAGE (VOLTS) IC/IB = 10 VCE , VOLTAGE (VOLTS) 0.01 0.1 1 IC, COLLECTOR CURRENT (AMPS) TJ = 25C TJ = - 20C 1 TJ = - 20C TJ = 25C 0.5 TJ = 125C TJ = 125C 0.1 0.001 0.1 1 0.01 IC, COLLECTOR CURRENT (AMPS) 0 0.001 10 Figure 5. Collector-Emitter Saturation Voltage 0.1 1 0.01 IC, COLLECTOR CURRENT (AMPS) 10 Figure 6. Base-Emitter Saturation Region 1.5 2 IC/IB = 10 TJ = 25C 1 TJ = - 20C 0.5 TJ = 25C TJ = 125C 0 0.001 1.5 3A 2A 1A 1 0.5 VCE(sat) (IC = 500 mA) 0.1 1 0.01 IC, COLLECTOR CURRENT (AMPS) Figure 7. Base-Emitter Saturation Region 4 VCE , VOLTAGE (VOLTS) VBE , VOLTAGE (VOLTS) 4A 10 0 0.01 1 0.1 IB, BASE CURRENT (A) Figure 8. Collector Saturation Region Motorola Bipolar Power Transistor Device Data 10 BUH51 TYPICAL STATIC CHARACTERISTICS 1000 1000 TJ = 25C 900 Cib BVCER (VOLTS) C, CAPACITANCE (pF) TJ = 25C f(test) = 1 MHz 100 Cob 800 700 600 BVCER @ 10 mA 500 BVCER(sus) @ 200 mA, 25 mH 400 10 1 10 VR, REVERSE VOLTAGE (VOLTS) 100 10 Figure 9. Capacitance 100 1000 RBE () 10000 100000 Figure 10. Resistive Breakdown TYPICAL SWITCHING CHARACTERISTICS 2500 10 IB1 = IB2 VCC = 300 V PW = 40 s 8 IC/IB = 5 t, TIME ( s) t, TIME (ns) 2000 1500 1000 IC/IB = 5 6 4 2 500 TJ = 125C TJ = 25C 0 0 1 2 IC, COLLECTOR CURRENT (AMPS) IB1 = IB2 VCC = 300 V PW = 40 s TJ = 125C TJ = 25C 0 3 0 Figure 11. Resistive Switching, ton 1 2 IC, COLLECTOR CURRENT (AMPS) 3 Figure 12. Resistive Switch Time, toff 4 7 IC/IB = 5 t, TIME ( s) 3 t, TIME ( s) 5 IC/IB = 10 IB1 = IB2 VCC = 15 V VZ = 300 V LC = 200 H IB1 = IB2 VCC = 15 V VZ = 300 V LC = 200 H 2 3 1 TJ = 125C TJ = 25C TJ = 125C TJ = 25C 0 1 0 2 1 IC, COLLECTOR CURRENT (AMPS) Figure 13. Inductive Storage Time, tsi Motorola Bipolar Power Transistor Device Data 3 0.5 1 1.5 IC, COLLECTOR CURRENT (AMPS) 2 Figure 13 Bis. Inductive Storage Time, tsi 5 BUH51 TYPICAL SWITCHING CHARACTERISTICS 1000 800 IB1 = IB2 VCC = 15 V 800 VZ = 300 V LC = 200 H tc t, TIME (ns) t, TIME (ns) IB1 = IB2 VCC = 15 V VZ = 300 V 600 L = 200 H C tc 400 tc 600 400 tfi ttfifi 200 200 TJ = 125C TJ = 25C TJ = 125C TJ = 25C tfi 0 0 0.5 1.5 1 2 IC, COLLECTOR CURRENT (AMPS) 2.5 0.5 1 1.5 2 IC, COLLECTOR CURRENT (AMPS) Figure 14. Inductive Storage Time, tc & tfi @ IC/IB = 5 Figure 15. Inductive Storage Time, tc & tfi @ IC/IB = 10 4 450 IBoff = IB2 VCC = 15 V VZ = 300 V LC = 200 H 400 t fi , FALL TIME (ns) 350 tsi , STORAGE TIME (s) 2.5 3 IC = 0.8 A 2 IC = 2 A TJ = 125C TJ = 25C 1 2 4 IB1 = IB2 VCC = 15 V VZ = 300 V LC = 200 H 6 hFE, FORCED GAIN 300 250 200 150 100 8 10 3 5 4 t c , CROSSOVER TIME (ns) 6 7 hFE, FORCED GAIN 8 9 Figure 17. Inductive Fall Time TJ = 125C TJ = 25C 700 IC = 0.8 A 0 Figure 16. Inductive Storage Time 800 TJ = 125C TJ = 25C IC = 2 A 50 IC = 2 A 600 IB1 = IB2 VCC = 15 V VZ = 300 V LC = 200 H 500 400 300 200 IC = 0.8 A 100 3 4 5 6 7 hFE, FORCED GAIN 8 9 10 Figure 18. Inductive Crossover Time 6 Motorola Bipolar Power Transistor Device Data 10 BUH51 TYPICAL SWITCHING CHARACTERISTICS 10 VCE 9 dyn 1 s 90% IC IC 8 6 0V tfi tsi 7 dyn 3 s 10% IC 10% Vclamp Vclamp 5 tc 4 90% IB 3 1 s 2 3 s IB 90% IB1 IB 1 0 TIME Figure 19. Dynamic Saturation Voltage Measurements 0 1 2 3 4 TIME 5 6 7 8 Figure 20. Inductive Switching Measurements Table 1. Inductive Load Switching Drive Circuit +15 V 1 F 150 3W 100 3W IC PEAK 100 F MTP8P10 VCE PEAK VCE MTP8P10 RB1 MPF930 IB1 MUR105 MPF930 +10 V Iout IB A 50 MJE210 COMMON 150 3W 500 F IB2 RB2 MTP12N10 1 F Inductive Switching L = 200 H RB2 = 0 VCC = 15 Volts RB1 selected for desired IB1 V(BR)CEO(sus) L = 10 mH RB2 = VCC = 20 Volts IC(pk) = 100 mA -Voff RBSOA L = 500 H RB2 = 0 VCC = 15 Volts RB1 selected for desired IB1 TYPICAL THERMAL RESPONSE POWER DERATING FACTOR 1 SECOND BREAKDOWN DERATING 0.8 0.6 THERMAL DERATING 0.4 0.2 0 20 40 80 120 100 60 TC, CASE TEMPERATURE (C) 140 160 Figure 21. Forward Bias Power Derating Motorola Bipolar Power Transistor Device Data 7 BUH51 TJ(pk) may be calculated from the data in Figure 24. At any case temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations imposed by second breakdown. For inductive loads, high voltage and current must be sustained simultaneously during turn-off with the base to emitter junction reverse biased. The safe level is specified as a reverse biased safe operating area (Figure 23). This rating is verified under clamped conditions so that the device is never subjected to an avalanche mode. There are two limitations on the power handling ability of a transistor: average junction temperature and second breakdown. Safe operating area curves indicate IC - VCE limits of the transistor that must be observed for reliable operation; i.e., the transistor must not be subjected to greater dissipation than the curves indicate. The data of Figure 22 is based on T C = 25C; T J(pk) is variable depending on power level. Second breakdown pulse limits are valid for duty cycles to 10% but must be derated when T C > 25C. Second breakdown limitations do not derate the same as thermal limitations. Allowable current at the voltages shown on Figure 22 may be found at any case temperature by using the appropriate curve on Figure 21. 4 10 IC, COLLECTOR CURRENT (AMPS) IC, COLLECTOR CURRENT (AMPS) 100 1 s 10 s 1 ms 1 DC 5 ms EXTENDED SOA 0.1 GAIN 4 3 2 1 -5 V 0V 0.01 TC 125C LC = 500 H -1.5 V 0 10 1000 100 VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS) 200 Figure 22. Forward Bias Safe Operating Area 500 300 400 600 700 800 VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS) Figure 23. Reverse Bias Safe Operating Area TYPICAL THERMAL RESPONSE r(t), TRANSIENT THERMAL RESISTANCE (NORMALIZED) 1 0.5 0.2 0.1 0.1 P(pk) 0.05 0.02 t1 t2 DUTY CYCLE, D = t1/t2 SINGLE PULSE 0.01 0.01 0.1 1 RJC(t) = r(t) RJC RJC = 2.5C/W MAX D CURVES APPLY FOR POWER PULSE TRAIN SHOWN READ TIME AT t1 TJ(pk) - TC = P(pk) RJC(t) 10 100 1000 t, TIME (ms) Figure 24. Typical Thermal Response (ZJC(t)) for BUH51 8 Motorola Bipolar Power Transistor Device Data 900 BUH51 PACKAGE DIMENSIONS -B- U F Q -A- NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. C M 1 2 3 H K J V G S R 0.25 (0.010) A M M B M D 2 PL 0.25 (0.010) M A M B M DIM A B C D F G H J K M Q R S U V INCHES MIN MAX 0.425 0.435 0.295 0.305 0.095 0.105 0.020 0.026 0.115 0.130 0.094 BSC 0.050 0.095 0.015 0.025 0.575 0.655 5 _ TYP 0.148 0.158 0.045 0.055 0.025 0.035 0.145 0.155 0.040 --- MILLIMETERS MIN MAX 10.80 11.04 7.50 7.74 2.42 2.66 0.51 0.66 2.93 3.30 2.39 BSC 1.27 2.41 0.39 0.63 14.61 16.63 5 _ TYP 3.76 4.01 1.15 1.39 0.64 0.88 3.69 3.93 1.02 --- STYLE 1: PIN 1. EMITTER 2. COLLECTOR 3. BASE CASE 77-08 TO-225AA TYPE ISSUE V Motorola Bipolar Power Transistor Device Data 9 BUH51 Motorola reserves the right to make changes without further notice to any products herein. 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Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, Toshikatsu Otsuki, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-3521-8315 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE (602) 244-6609 INTERNET: http://Design-NET.com HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 10 Motorola Bipolar Power Transistor Device Data *BUH51/D* BUH51/D