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STMicroelectronics
STMicroelectronics

BF257 Datasheet

HIGH VOLTAGE VIDEO AMPLIFIERS


BF257 Datasheet Preview


BF257
BF258-BF259
HIGH VOLTAGE VIDEO AMPLIFIERS
DESCRIPTION
The BF257, BF258 and BF259 are silicon planar
epitaxial NPN transistors in Jedec TO-39 metal
case. They are particularly designed for videooutput
stages in CTV and MTV sets, class A audio output
stages and drivers for horizontal deflection circuits.
TO-39
INTERNAL SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VCBO
VCEO
VEBO
IC
I CM
Pt ot
Tstg
Tj
Collector-base Voltage (IE = 0)
Collector-emitter Voltage (IB = 0)
Emitter-base Voltage (IC = 0)
Collector Current
Collector Peak Current
Total Power Dissipation at Tamb 50 °C
Storage Temperature
Junction Temperature
October 1988
Value
BF257 BF258 BF259
160 250 300
160 250 300
5
100
200
5
– 55 to 200
200
Unit
V
V
V
mA
mA
W
°C
°C
1/5
Page 1

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

Collector Cutoff Current.
BF257-BF258-BF259
Collector-base Capacitance.
Transition Frequency.
Power Rating Chart.
Safe Operating Area.
3/5
Page 3
Part Number BF257
Manufactur STMicroelectronics
Description HIGH VOLTAGE VIDEO AMPLIFIERS
Total Page 5 Pages
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BF257 datasheet
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BF257 datasheet
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