2N3442

http://onsemi.com

3

ACTIVE REGION SAFE OPERATING AREA INFORMATION

There are two limitations on the power−handling

ability of a transistor: average junction temperature and

second breakdown. Safe operating area curves indicate

for reliable operation, i.e., the transistor must not be

subjected to greater dissipation than the curves indicate.

is variable depending on conditions. At high case

temperatures, thermal limitations will reduce the power

that can be handled to values less than the limitations

imposed by second breakdown.

20

2.0

10

7.0

5.0

3.0

2.0

1.0

0.7

0.2

5.0

20

100

200

CURRENT LIMIT

SINGLE PULSE

SECOND BREAKDOWN LIMIT

dc

1.0 ms

10 ms

0.5

0.3

3.0

7.0 10

30

50 70

30 ms

50 ms

100 ms

100 ms

Figure 2. 2N3442

400

0.1

Figure 3. DC Current Gain

4.0

0.2 0.3

0.5 0.7 1.0

2.0 3.0

5.0

10

40

20

100

60

25°C

−55 °C

6.0

10

200

7.0

Figure 4. Collector−Saturation Region

1.4

2.0

0

5.0

10

20

50

100

200

500

1.0k 2.0k

1.0

0.8

0.6

0.4

4.0 A

8.0 A

1.2

0.2

2.0 A