BD157 BD158 BD159

2

Motorola Bipolar Power Transistor Device Data

25

20

15

10

5.0

0

20

40

60

80

100

120

140

160

Figure 1. Power–Temperature Derating Curve

TC, CASE TEMPERATURE (°C)

1.0

10

Figure 2. “On” Voltages

IC, COLLECTOR CURRENT (mA)

0.8

0.6

0.4

0.2

0

20

30

50

100

200 300

500

VBE @ VCE = 10 V

VCE(sat) @ IC/IB = 10

TJ = + 25°C

VBE @ IC/IB = 10

IC/IB = 5.0

1.0

10

Figure 3. DC Safe Operating Area

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

0.7

0.5

0.3

0.2

0.1

0.07

0.05

0.01

20

30

50

100

300

200

BONDING WIRE LIMITED

THERMALLY LIMITED @ TC = 25°C

(SINGLE PULSE)

SECOND BREAKDOWN LIMITED

0.03

0.02

TJ = 150°C

dc

500

µs

10

µs

1.0 ms

BD157

BD158

BD159

The Safe Operating Area Curves indicate IC – VCE limits

below which the device will not enter secondary breakdown.

Collector load lines for specific circuits must fall within the ap-

plicable Safe Area to avoid causing a catastrophic failure. To

insure operation below, the maximum TJ, power–tempera-

ture derating must be observed for both steady state and

pulse power conditions.

Figure 4. Current Gain

IC, COLLECTOR CURRENT (mAdc)

10

1.0

2.0

3.0

5.0

10

20

30

50

100

200

300

500

300

200

70

30

20

TJ = 150°C

50

100

+ 100

°C

+ 25

°C

– 55

°C

7.0

70

VCE = 10 V

VCE = 2.0 V