BF457
BF458-BF459
January 1989
HIGHVOLTAGE VIDEO AMPLIFIERS
DESCRIPTION
The BF457, BF458 and BF459 are silicon planar
epitaxial NPN transistors in Jedec TO-126 plastic
package. They are particularly intended for use as
videooutputstagesincolourandblackandwhiteTV
receivers, class A output stagesand drivers forhor-
izontal deflection circuits. These transistors have
beenstudied inorder toguarantee the maximumre-
sistance against flash over.
ABSOLUTE MAXIMUM RATINGS
Value
Symbol Parameter BF 457 BF 458 BF 459 Unit
VCBO Collector-base Voltage (IE= 0) 160 250 300 V
VCEO Collector-emitter Voltage (IB= 0) 160 250 300 V
VEBO Emitter-base Voltage (IC=0) 5 V
ICM Collector Peak Current 300 mA
IBM Base Peak Current 50 mA
Ptot Total Power Dissipation at Tamb ≤25 °C
Tcase ≤25 °C1.25
12.5 W
W
Tstg Storage Temperature – 55 to 150 °C
TjJunction Temperature 150 °C
SOT-32
INTERNAL SCHEMATIC DIAGRAM
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ELECTRICAL CHARACTERISTICS (Tcase =25°C unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ICBO Collector Cutoff Current
(IE=0) for BF 457
for BF 458
for BF 459
VCB = 100 V
VCB = 200 V
VCB = 250 V
50
50
50
nA
nA
nA
V(BR)CEO* Collector-emitter Breakdown
Voltage (IB=0) I
C=10mA for BF 457
for BF 458
for BF 459
160
250
300
V
V
V
V(BR) EBO Emittter-base Breakdown
Voltage (IC=0) I
E=100µA5 V
V
CE (sat )* Collector-emitter
Saturation Voltage IC=50mA IB=10mA 1 V
hFE* DC Current Gain IC=30mA VCE =10V 30 80
f
TTransition Frequency IC=30mA VCE = 10 V 90 MHz
Cre Reverse Capacitance IC=0
f = 1 MHz VCE =30V 4 pF
C
oe Output Capacitance IC=0
f = 1 MHz VCE =30V 5 pF
* Pulsed : pulse duration = 300 µs, duty cycle = 1 %.
DC Current Gain. Collector-emitter Saturation Voltage.
THERMAL DATA
Rth j-case
Rth j-amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient Max
Max 10
100 °C/W
°C/W
BF457-BF458-BF459
2/5
Transition Frequency. Outputand Reverse Capacitance.
BF457-BF458-BF459
3/5
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 7.4 7.8 0.291 0.307
B 10.5 10.8 0.413 0.445
b 0.7 0.9 0.028 0.035
b1 0.49 0.75 0.019 0.030
C 2.4 2.7 0.04 0.106
c1 1.2 0.047
D 15.7 0.618
e 2.2 0.087
e3 4.4 0.173
F 3.8 0.150
G 3 3.2 0.118 0.126
H 2.54 0.100
SOT-32 MECHANICAL DATA
0016114
BF457-BF458-BF459
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Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor forany infringement of patents orother rights of third partieswhich may results from its use. No
license is granted by implication or otherwiseunder anypatent or patent rights ofSGS-THOMSON Microelectronics.Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts arenot authorizedforuse as criticalcomponents inlife supportdevices or systemswithout express
written approval of SGS-THOMSON Microelectonics.
1994 SGS-THOMSON Microelectronics- All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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BF457-BF458-BF459
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