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2011 ROHM Co., Ltd. All rights reserved.

2011.11 - Rev.B

Data Sheet

BC857B



Electrical characteristics curves

Fig.9 Collector output capacitance vs.

collector-base voltage

Emitter inputcapacitance vs.

emitter-base voltage

−0.5

−20

2

5

10

−1

−2

−5

−10

20

Cib

Cob

Ta=25°C

f=1MHz

0A

0A

Fig.8 Gain bandwidth product vs.

emitter current

50

100

0.5

20

50

100

200

500

1000

12

5

10

mA)

Ta=25°C

=

−12V

-0.1

-1

-10

-100

0

-0.2

-0.4

-0.6

-0.8

-1

-1.2

BASE TO EMITTER VOLTAGE : V

V

Ta=125ºC

75ºC

25ºC

-55ºC

0

-20

-40

-60

-80

-100

-120

0-2

-4

-6

-8

-10

COLLECTOR TO EMITTER VOLTAGE : V

-450uA

-400uA

-350uA

-300uA

Ta=25ºC

Fig 1. Grounded Emitter Propagation

Characteristics

Fig 2. Grounded Emitter Output

Characteristics (I)

-0.01

-0.1

-1

-0.1

-1

-10

-100

COLLECTOR CURRENT : I

I

Ta=125ºC

75ºC

25ºC

-55ºC

Fig 7. Collector Saturation Voltage

vs. Collector Current (II)

10

100

1000

-0.1

-1

-10

-100

COLLECTOR CURRENT : I

V

Ta=125ºC

75ºC

25ºC

-55ºC

-0.01

-0.1

-1

-0.1

-1

-10

-100

COLLECTOR CURRENT : I

Ta=25ºC

I

20/1

10/1

Fig 5. DC Current Gain vs.

Collector Current (II)

Fig 6. Collector Saturation Voltage

vs. Collector Current (I)

10

100

1000

-0.1

-1

-10

-100

COLLECTOR CURRENT : I

Ta=25ºC

V

-3V

-1V

Fig 4. DC Current Gain vs.

Collector Current (I)

0

-5

-10

-15

0

-0.4

-0.8

-1.2

-1.6

-2

COLLECTOR TO EMITTER VOLTAGE : V

Ta=25ºC

Fig 3. Grounded Emitter Output

Characteristics (II)