Datasheet

ELECTRICAL CHARACTERISTICS (T
amb
=25°C unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
CBO
Collector Cutoff Current
(I
E
=0)
for BF257
for BF258
for BF259
V
CB
= 100 V
V
CB
= 200 V
V
CB
= 250 V
50
50
50
nA
nA
nA
V
(BR) CBO
Collector-base
Breakdown Voltage
(I
E
=0)
I
C
=100µA
for BF257
for BF258
for BF259
160
250
300
V
V
V
V
(BR)CEO
* Collector-emitter
Breakdown Voltage
(I
B
=0)
I
C
=10mA
for BF257
for BF258
for BF259
160
250
300
V
V
V
V
(BR) EBO
Emittter-base
Breakdown Voltage
(I
C
=0)
I
E
=100µA5 V
V
CE (sat)
* Collector-emitter
Saturation Voltage
I
C
=30mA I
B
=6mA 1 V
h
FE
* DC Current Gain I
C
=30mA V
CE
=10V 25
f
T
Transition Frequency I
C
=15mA V
CE
=10V 90 MHz
C
re
Reverse Capacitance I
C
=0
f=1MHz
V
CE
=30V
3pF
* Pulsed : pulse duration = 300 µs, duty cycle = 1 %.
DC Current Gain.
THERMAL DATA
R
th j-case
R
th j-amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max
Max
30
175
°C/W
°C/W
BF257-BF258-BF259
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