TIP140 TIP141 TIP142 TIP145 TIP146 TIP147

4

Motorola Bipolar Power Transistor Device Data

ACTIVE–REGION SAFE OPERATING AREA

There are two limitations on the power handling ability of a

transistor: average junction temperature and second break-

down. 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 dissipa-

tion than the curves indicate.

The data of Figure 6 is based on TJ(pk) = 150_C; TC is

variable depending on conditions. At high case temper-

atures, thermal limitations will reduce the power that can be

handled to values less than the limitations imposed by

second breakdown.

SECONDARY BREAKDOWN LIMIT

BONDING WIRE LIMIT

THERMAL LIMITATION @ TC = 25°C

Figure 6. Active–Region Safe Operating Area

dc

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

2.0

10

10

0.2

5.0

20

1.0

20

TJ = 150°C

50

30

TIP140, 145

3.0

7.0

15

70

100

TIP141, 146

TIP142, 147

15

10

1.0

2.0

5.0

7.0

Figure 7. Unclamped Inductive Load

L, UNCLAMPED INDUCTIVE LOAD (mH)

0.5

1.0

2.0

5.0

10

20

50

100

100 mJ

INPUT

MPS–U52

50

50

RBB1

1.5 k

RBB2

= 100

VBB2 = 0

VBB1 = 10 V

TUT

VCE MONITOR

100 mH

VCC = 20 V

IC

MONITOR

RS = 0.1

TEST CIRCUIT

NOTE 1: Input pulse width is increased until ICM = 1.42 A.

NOTE 2: For NPN test circuit reverse polarities.

INPUT

VOLTAGE

COLLECTOR

CURRENT

1.42 A

VCE(sat)

– 20 V

COLLECTOR

VOLTAGE

V(BR)CER

w

≈ 7.0 ms (SEE NOTE 1)

5.0 V

0

100 ms

0

VOLTAGE AND CURRENT WAVEFORMS

Figure 8. Inductive Load

PNP

NPN

Figure 9. Magnitude of Common Emitter

Small–Signal Short–Circuit Forward

Current Transfer Ratio

f, FREQUENCY (MHz)

2.0

1.0

10

5.0

100

1.0

3.0

5.0

7.0

2.0

7.0

10

VCE = 10 V

IC = 1.0 A

TJ = 25°C

5.0

4.0

0

1.0

2.0

3.0

Figure 10. Free–Air Temperature

Power Derating

TA, FREE–AIR TEMPERATURE (°C)

0

40

80

120

160

200

20

50

70

PNP

NPN