MJ10012 MJH10012

4

Motorola Bipolar Power Transistor Device Data

Figure 9. Thermal Response

t, TIME (ms)

1

0.01

0.5

0.2

0.1

0.05

0.03

0.01

R

θJC(t) = r(t) RθJC

R

θJC = °C/W MAX

D CURVES APPLY FOR POWER

PULSE TRAIN SHOWN

READ TIME AT t1

TJ(pk) – TC = P(pk) R

θJC(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

0.02

0.05

0.1

0.2

0.5

1

2

5

10

20

50

100

200

2,000

500

0.7

0.3

0.07

0.02

1,000

50

5

Figure 10. Forward Bias Safe Operating Area

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

20

10

5

2

1

0.2

0.1

0.005

50

70 100

200

500

BONDING WIRE LIMIT

THERMAL LIMIT (SINGLE PULSE)

SECOND BREAKDOWN LIMIT

300

0.01

MJH10012

TC = 25°C

MJ10012

dc

5.0 ms

1.0 ms

100

µs

10

20

30

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 10 is based on TC = 25_C, TJ(pk) is

variable depending on power level. Second breakdown pulse

limits are valid for duty cycles to 10% but must be derated

when TC ≥ 25_C. Second breakdown limitations do not der-

ate the same as thermal limitations. Allowable current at the

voltages shown on Figure 10 may be found at any case tem-

perature by using the appropriate curve on Figure 11.

TJ(pk) may be calculated from the data in Figure 11. At high

case temperatures, thermal limitations will reduce the power

that can be handled to values less than the limitations im-

posed by second breakdown.

Figure 11. Power Derating

Figure 12. Usage Test Circuit

t1 to be selected such that IC reaches 6 Adc before switch-off.

NOTE: “Usage Test,” Figure 12 specifies energy handling

capabilities in an automotive ignition circuit.

100

80

60

20

0

0

40

80

120

200

TC, CASE TEMPERATURE (°C)

THERMAL DERATING

SECOND BREAKDOWN

DERATING

160

MJH10012

MJ10012

20

1.5

10 mH

STANCORE

C2688

VZ = 400 V

T.U.T.

0.3

µF

10 Vdc

VCC = 12 Vdc

0 Vdc

t1

5 ms

220

1N4933

2N5881

27