BF959

$0.12

Description：RF TRANS NPN 20V 700MHZ TO-92
Series：-

SKU:a4c26886a6ad Category: Bipolar RF Transistors Brand: onsemi

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Product introduction

Product Detailed Parameters

Description：RF TRANS NPN 20V 700MHZ TO-92
Series：-
Mfr：onsemi
Package：Bulk
Transistor Type：NPN
Voltage - Collector Emitter Breakdown (Max)：20V
Frequency - Transition：700MHz
Noise Figure (dB Typ @ f)：3dB @ 200MHz
Gain：-
Power - Max：625mW
DC Current Gain (hFE) (Min) @ Ic, Vce：40 @ 20mA, 10V
Current - Collector (Ic) (Max)：100mA
Operating Temperature：-55°C ~ 150°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-226-3, TO-92-3 Long Body
Supplier Device Package：TO-92 (TO-226)
Grade：-
Qualification：-

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BF959

Overview

The BF959 is an NPN silicon VHF transistor manufactured by onsemi, designed for linear broadband amplifier stages and SAW filter driver applications in TV tuners. It operates within a collector-emitter voltage range of up to 20 Vdc and supports continuous collector currents of 100 mAdc. The device features a current-gain bandwidth product (fT) ranging from 600 MHz to 700 MHz at specified bias conditions. Electrical characteristics include a DC current gain (hFE) between 35 and 40, with a typical noise figure of 3.0 dB at 200 MHz. Thermal resistance values are 200 °C/W junction-to-ambient and 83.3 °C/W junction-to-case.

Feature Summary

Optimized for linear broadband VHF amplifier stages
Designed for SAW filter driver applications in TV tuners
High current-gain bandwidth product suitable for VHF frequencies

Applications

Linear broadband VHF amplifier stages
SAW filter driver applications in TV tuners

Procurement Notes

Verify the specific ordering suffix when purchasing, as it determines the packaging format such as bulk box, ammo pack, or tape and reel. Confirm that the component meets Pb-Free requirements if necessary, indicated by the 'G' suffix in part numbers like BF959G. Ensure the pin configuration matches Style 21 (Collector, Emitter, Base) for your circuit design. Check for any recent product change notices regarding lead frame or material updates.

Selection Notes

Select this component for VHF frequency applications requiring high linearity and low noise figures. Consider the thermal constraints, as total device dissipation is limited to 625 mW at ambient temperature. Verify that the required DC current gain and bandwidth product meet the specific amplifier design specifications. Ensure the operating voltage does not exceed the 20 Vdc collector-emitter breakdown limit under all signal conditions.

Part Context

The BF959 belongs to the family of NPN silicon transistors intended for radio frequency and video tuner applications. It is distinct from general-purpose switching transistors due to its optimized small-signal characteristics at VHF frequencies. The device is housed in a TO-92 package, providing a compact solution for consumer electronics where space is limited but RF performance is critical.