BD237

2

Motorola Bipolar Power Transistor Device Data

Figure 1. Active Region Safe Operating Area

10

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

3

1

0.1

3

10

30

100

0.3

TJ = 150°C

dc

5 ms

1

100

µs

1 ms

BD237

BD236

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–temperature

derating must be observed for both steady state and pulse

power conditions.

Figure 2. Collector Saturation Region

IB, BASE CURRENT (mA)

1.0

0

0.2

0.8

0.6

0.4

0.2

1.0

2.0

10

30

50

200

IC = 0.1 A

0.25 A

1.0 A

0.5 A

0.3

0.5

100

20

3.0

5.0

TJ = 25°C

1000

Figure 3. Current Gain

IC, COLLECTOR CURRENT (mA)

10

100

TJ = + 150°C

TJ = + 55°C

VCE = 2.0 V

700

500

300

200

70

50

30

20

TJ = + 25°C

3.0 5.0

10

20 30

50

2000

2.0

100

200

1000

300 500

Figure 4. “On” Voltages

0

1.5

3.0 5.0

10

20 30

50

2000

2.0

100

200

1000

300 500

1.2

0.9

0.6

0.3

IC, COLLECTOR CURRENT (mA)

TJ = 25°C

VBE(sat) @ IC/IB = 10

VCE(sat) @ IC/IB = 10

VBE @ VCE = 2.0 V

Figure 5. 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 0.03

0.05

0.1

0.2 0.3

0.5

1.0

2.0 3.0

5.0

10

20

30

50

100

200 300

1000

500

θJC(t) = r(t) θJC

θJC = 4.16°C/W MAX

θJC = 3.5°C/W TYP

D CURVES APPLY FOR POWER

PULSE TRAIN SHOWN

READ TIME AT t1

TJ(pk) – TC = P(pk) θJC(t)

P(pk)

t1

t2

DUTY CYCLE, D = t1/t2

D = 0.5

SINGLE PULSE

D = 0.2

D = 0.1

D = 0.05

D = 0.01