MJ10020 MJ10021

6

Motorola Bipolar Power Transistor Device Data

The Safe Operating Area figures shown in Figures 13 and are

specified for these devices under the test conditions shown.

100

Figure 13. Maximum Forward Bias Safe

Operating Area

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

2.0

5.0

10

20

50

300

10

1.0

0

Figure 14. Maximum RBSOA, Reverse Bias

Safe Operating Area

VCEM, COLLECTOR–EMITTER VOLTAGE (VOLTS)

50

150

250

40

100

TC = 25°C

80

60

20

IC/IB ≥ 25

25

°C ≤ TJ ≤ 100°C

100

200

250

0.1

0.01

dc

1 ms

100

200

300

30

70

50

10

90

0

TURN–OFF LOAD LINE

BOUNDARY FOR MJ10021

THE LOCUS FOR MJ10020

IS 50 V LESS

10

µs

100

µs

1.0

BONDING WIRE LIMIT

THERMAL LIMIT (SINGLE PULSE)

SECOND BREAKDOWN LIMIT

VBE(off) = 5 V

VBE(off) = 0 V

VBE(off) = 2 V

SAFE OPERATING AREA INFORMATION

FORWARD BIAS

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 13 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 13 may be found at any case tem-

perature by using the appropriate curve on Figure 15.

TJ(pk) may be calculated from the data in Figure 12. At

high case temperatures, thermal limitations will reduce the

power that can be handled to values less than the limitations

imposed by second breakdown.

REVERSE BIAS

For Inductive loads, high voltage and high current must be

sustained simultaneously during turn–off, in most cases, with

the base to emitter junction reverse biased. Under these

conditions the collector voltage must be held to a safe level

at or below a specific value of collector current. This can be

accomplished by several means such as active clamping,

RC snubbing, load line shaping, etc. The safe level for these

devices is specified as Reverse Bias Safe Operating Area

and represents the voltage–current condition allowable dur-

ing reverse biased turn–off. This rating is verified under

clamped conditions so that the device is never subjected to

an avalanche mode. Figure 14 gives the RBSOA character-

istics.

0

Figure 15. Power Derating

TC, CASE TEMPERATURE (°C)

40

80

120

40

0

100

80

60

20

200

SECOND BREAKDOWN

DERATING

160

THERMAL

DERATING