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3 / 6 page BDX33B, BDX33C* (NPN) BDX34B, BDX34C* (PNP) http://onsemi.com 3 Figure 1. Thermal Response t, TIME OR PULSE WIDTH (ms) 1.0 0.01 0.01 0.7 0.5 0.3 0.2 0.1 0.07 0.05 0.03 0.02 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 1000 500 RqJC(t) = r(t) RqJC RqJC = 1.92°C/W D CURVES APPLY FOR POWER PULSE TRAIN SHOWN READ TIME AT t1 TJ(pk) - TC = P(pk) RqJC(t) P(pk) t1 t2 DUTY CYCLE, D = t1/t2 D = 0.5 SINGLE PULSE 0.2 0.05 0.1 0.02 0.01 SINGLE PULSE 0.03 0.3 3.0 30 300 20 1.0 10 5.0 2.0 1.0 0.5 0.02 3.0 5.0 7.0 10 20 30 50 100 70 0.2 dc 5.0 ms 1.0 ms BDX33B BDX33C 500 ms 100 ms TC = 25°C CURVES APPLY BELOW RATED VCEO 0.05 0.1 2.0 20 1.0 Figure 2. Active-Region Safe Operating Area VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS) 10 5.0 2.0 1.0 0.5 0.02 3.0 5.0 7.0 10 20 30 50 100 70 0.2 dc 5.0 ms 1.0 ms BDX34B BDX34C 500 ms 100 ms TC = 25°C BONDING WIRE LIMITED THERMALLY LIMITED @ TC = 25°C (SINGLE PULSE) SECOND BREAKDOWN LIMITED CURVES APPLY BELOW RATED VCEO 0.05 0.1 2.0 VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS) BONDING WIRE LIMITED THERMALLY LIMITED @ TC = 25°C (SINGLE PULSE) SECOND BREAKDOWN LIMITED 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 3 is based on TJ(pk) = 150 °C; TC is variable depending on conditions. Second breakdown pulse limits are valid for duty cycles to 10% provided TJ(pk) = 150°C. TJ(pk) may be calculated from the data in Figure 4. At high case temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations imposed by second breakdown. 10,000 1.0 Figure 3. Small-Signal Current Gain f, FREQUENCY (kHz) 10 2.0 5.0 10 20 50 100 200 1000 500 300 100 5000 20 3000 200 500 2000 1000 30 50 300 0.1 Figure 4. Capacitance VR, REVERSE VOLTAGE (VOLTS) 30 1.0 2.0 5.0 20 100 10 200 100 70 50 TJ = 25°C Cib Cob 50 0.2 0.5 TJ = 25°C VCE = 4.0 Vdc IC = 3.0 Adc PNP NPN PNP NPN |
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