2 Motorola Bipolar Power Transistor Device Data
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ELECTRICAL CHARACTERISTICS (TC = 25
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C unless otherwise noted)
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Collector–Emitter Breakdown Voltage(1) BD676, 676A
(IC = 50 mAdc, IB = 0) BD678, 678A
BD680, 680A
BD682
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Collector Cutoff Current (VCE = Half Rated VCEO, IB = 0)
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Collector Cutoff Current
(VCB = Rated BVCEO, IE = 0)
(VCB = Rated BVCEO. IE = 0, TC = 100°C)
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Emitter Cutoff Current (VBE = 5.0 Vdc, IC = 0)
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DC Current Gain(1)
(IC = 1.5 Adc, VCE = 3.0 Vdc) BD676, 678, 680, 682
(IC = 2.0 Adc, VCE = 3.0 Vdc) BD676A, 678A, 680A
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Collector–Emitter Saturation Voltage(1)
(IC = 1.5 Adc, IB = 30 mAdc) BD678, 680, 682
(IC = 2.0 Adc, IB = 40 mAdc) BD676A, 678A, 680A
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Base–Emitter On Voltage(1)
(IC = 1.5 Adc, VCE = 3.0 Vdc) BD678, 680, 682
(IC = 2.0 Adc, VCE = 3.0 Vdc) BD676A, 678A, 680A
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Small–Signal Current Gain (IC = 1.5 Adc, VCE = 3.0 Vdc, f = 1.0 MHz)
—
(1) Pulse Test: Pulse Width
v
300 µs, Duty Cycle
v
2.0%.
Figure 2. DC Safe Operating Area
5.0
1.0 VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)
2.0
1.0
0.5
0.05 2.0 5.0 10 50 100
BONDING WIRE LIMIT
THERMAL LIMIT at TC = 25
°
C
SECONDARY BREAKDOWN LIMIT
0.2
0.1
IC, COLLECTOR CURRENT (AMP)
TC = 25
°
CBD676, 676A
BD678, 678A
BD680, 680A
BD682
20
There are two limitations on the power handling ability of a
transistor average junction temperature and secondary
breakdown. Safe operating area curves indicate IC – VCE lim-
its of the transistor that must be observed for reliable opera-
tion; e.g., the transistor must not be subjected to greater
dissipation than the curves indicate.
At high case temperatures, thermal limitations will reduce
the power that can be handled to values less than the limita-
tions imposed by secondary breakdown.
Figure 3. Darlington Circuit Schematic
BASE
PNP
BD676, 676A
BD678, 678A
BD680, 680A
BD682
COLLECTOR
EMITTER
[
8.0 k
[
120