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BF257 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. BF257
Description  HIGH VOLTAGE VIDEO AMPLIFIERS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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BF257 Datasheet(HTML) 2 Page - STMicroelectronics

   
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ELECTRICAL CHARACTERISTICS (Tamb =25 °C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I CB O
Collector Cutoff Current
(I E =0)
for BF257
for BF258
for BF259
VCB = 100 V
VCB = 200 V
VCB = 250 V
50
50
50
nA
nA
nA
V(BR) CB O
Collector-base
Breakdown Voltage
(I E =0)
I C =100 µA
for BF257
for BF258
for BF259
160
250
300
V
V
V
V(BR)CEO *
Collector-emitter
Breakdown Voltage
(I B =0)
I C =10 mA
for BF257
for BF258
for BF259
160
250
300
V
V
V
V(BR) EB O
Emittter-base
Breakdown Voltage
(I C =0)
I E =100 µA5
V
VCE (s at)*
Collector-emitter
Saturation Voltage
I C =30 mA
I B =6 mA
1
V
h FE*
DC Current Gain
IC =30 mA
VCE =10 V
25
f T
Transition Frequency
I C =15 mA
VCE =10 V
90
MHz
Cre
Reverse Capacitance
IC =0
f= 1 MHz
VCE =30 V
3pF
*
Pulsed : pulse duration = 300
µs, duty cycle = 1 %.
DC Current Gain.
THERMAL DATA
Rth j-cas e
R th j-amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max
Max
30
175
°C/W
°C/W
BF257-BF258-BF259
2/5


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