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Continental Device India Limited
An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company
NPN SILICON HIGH VOLTAGE TRANSISTORS BF257, BF 258, BF259
TO-39
Metal Can Package
INTENDED FOR VIDEO OUTPUT STAGES IN BLACK AND WHITE AND IN COLOUR
TELEVISION REVEIVERS.
ABSOLUTE MAXIMUM RATINGS (Ta=25ºC unless specified otherwise)
DESCRIPTION SYMBOL BF257 BF258 BF259 UNITS
Collector Emitter Voltage
Collector Base Voltage
Emitter Base Voltage
Collector Current Continuous
Peak
Total Power Dissipation @ Ta=25ºC
V
CEO
V
CBO
V
EBO
I
C
I
CM
P
D
Derate Above 25ºC <---------------6.67-------------> mW/ºC
Total Power Dissipation@ Tc=25ºC
P
D
Derate Above 25ºC <---------------46.67-----------> mW/ºC
T
Operating And Storage Junction
, T
j
stg
Temperature Range
THERMAL RESISTANCE
Junction to Ambient
Junction to Case
R
R
th(j-a)
th(j-c)
160 250 300 V
160 250 300 V
<----------------5----------------> V
<-------------100---------------> mA
<------------300----------------> mA
<------------1.0---------------> W
<----------------7----------------> W
<---------- -65 to +175------> ºC
<----------------150--------------> ºC/W
<----------------21.43-----------> ºC/W
ELECTRICAL CHARACTERISTICS (Ta=25º C unless specified otherwise)
DESCRIPTION SYMBOL TEST CONDITION BF257 BF258 BF259 UNITS
Collector Emitter Breakdown Voltage
Collector Base Breakdown Voltage
Emitter Base Breakdown Voltage
Collector Cut off Current
DC Current Gain
Collector Emitter Saturation Voltage
BV
CEOIC
BV
CBO
BV
EBO
I
CBO
h
FE
V
CE(Sat) IC
=10mA,IB=0
IC =100µA, IE =0
IE=100µA, Ic=0
VCB=100V, IE=0
V
=200V, IE=0
CB
V
=250V, IE=0
CB
IC=30mA,VCE=10V
=30mA,IB=6mA
>160
>160
>5
<0.05
ALL
>250 >300 V
>250 >300 V
>5 5 V
<0.05
<0.05
>25
<1 V
µA
µA
µA
DYNAMIC CHARACTERISTICS
Transition Frequency
f
IC=15mA, VCE=10V
T
TYP f=100MHz 75 MHz
Collector Base Capacitance
C
IE=0, VCB=30V,f=1MHz
cb
TYP 2.5 pF
*Pulse Test: Pulse Width <
Continental Device India Limited
300µs, Duty Cycle <2%
Data Sheet Page 1 of 3
Page 2
TO-39 Metal Can Package
BF257, BF 258, BF259
TO-39
Metal Can Package
A
B
DIM MIN MAX
A 8.50 9.39
B 7.74 8.50
C 6.09 6.60
C
E
D 0.40 0.53
E—0.88
F 2.41 2.66
G 4.82 5.33
K
H 0.71 0.86
J 0.73 1.02
K12.70 —
L 42 DEG 48 DEG
Al l d imens ions a r e i n mm
D
G
2
1
3
L
H
J
F
2
3
PIN CONFIGURATION
1. EMITTER
2. BASE
3. COLLECTOR
1
Packing Detail
PACKAGE
TO-39 500 pcs/polybag 540 gm/500 pcs 3" x 7.5" x 7.5" 20K 17" x 15" x 13.5 " 32K 40 kgs
Continental Device India Limited
STANDARD PACK INNER CARTON BOX
Net Weight/QtyDetails
Data Sheet Page 2 of 3
Qty
OUTER CARTON BOX
Qty Gr WtSize Size
Page 3
Notes BF257, BF 258, BF259
@
TO-39
Metal Can Package
Disclaimer
The product information and the selection guides facilitate selection of the CDIL's Discrete Semiconductor Device(s) best suited
for application in your product(s) as per your requirement. It is recommended that you completely review our Data Sheet(s) so as
to confirm that the Device(s) meet functionality parameters for your application. The information furnished in the Data Sheet and
on the CDIL Web Site/CD is believed to be accurate and reliable. CDIL however, does not assume responsibility for inaccuracies
or incomplete information. Furthermore, CDIL does not assume liability whatsoever, arising out of the application or use of any
CDIL product; neither does it convey any license under its patent rights nor rights of others. These products are not designed for
use in life saving/support appliances or systems. CDIL customers selling these products (either as individual Discrete
Semiconductor Devices or incorporated in their end products), in any life saving/support appliances or systems or applications do
so at their own risk and CDIL will not be responsible for any damages resulting from such sale(s).
CDIL strives for continuous improvement and reserves the right to change the specifications of its products without prior notice.
CDIL is a registered Trademark of
Continental Device India Limited
C-120 Naraina Industrial Area, New Delhi 110 028, India.
Telephone + 91-11-579 6150 Fax + 91-11-579 9569, 579 5290
e-mail sales
BF257_259Rev180701
Continental Device India Limited
cdil.com www.cdil.com
Data Sheet Page 3 of 3
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