Datasheet

ManualsBrandsUnbranded ManualsBJTs & IGBTsN/A NPN NPN

BF257

BF258-BF259

October 1988

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.

ABSOLUTE MAXIMUM RATINGS

Value

Symbol Parameter

BF257 BF258 BF259

Unit

CBO

Collector-base Voltage (I

= 0) 160 250 300 V

CEO

Collector-emitter Voltage (I

= 0) 160 250 300 V

EBO

Emitter-base Voltage (I

=0) 5 V

Collector Current 100 mA

Collector Peak Current 200 mA

tot

Total Power Dissipation at T

amb

≤ 50 °C5W

stg

Storage Temperature – 55 to 200 °C

Junction Temperature 200 °C

INTERNAL SCHEMATIC DIAGRAM

TO-39

1/5

Summary of content (5 pages)

PAGE 1
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.
PAGE 2
BF257-BF258-BF259 THERMAL DATA R t h j- cas e R t h j-amb Thermal Resistance Junction-case Thermal Resistance Junction-ambient Max Max °C/W °C/W 30 175 ELECTRICAL CHARACTERISTICS (T amb = 25 °C unless otherwise specified) Symbol I CB O V (BR) Parameter Collector Cutoff Current (I E = 0) Test Conditions for BF257 for BF258 for BF259 V CB = 100 V V CB = 200 V V CB = 250 V Min. Typ. Max.
PAGE 3
BF257-BF258-BF259 Collector Cutoff Current. Collector-base Capacitance. Transition Frequency. Power Rating Chart. Safe Operating Area.
PAGE 4
BF257-BF258-BF259 TO39 MECHANICAL DATA mm inch DIM. MIN. A TYP. MAX. MIN. 12.7 TYP. MAX. 0.500 B 0.49 0.019 D 6.6 0.260 E 8.5 0.334 F 9.4 0.370 G 5.08 0.200 H 1.2 0.047 I 0.9 0.035 45o (typ.
PAGE 5
BF257-BF258-BF259 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 for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice.