BF998 Datasheet, Replacement, Applications

yunying Release time：2023-11-24 Page View：1735

Trans RF MOSFET N-CH 12V 0.03A 4-Pin(3+Tab) SOT-143B

Catalog

BF998 Description
BF998 Overview
BF998 Pinout
BF998 CAD Model
BF998 Features
BF998 Applications
BF998 Alternatives
BF998 Typical Application Circuit
BF998 Functional Block Diagram
BF998 Package and Dimension
How to use the BF998
Advantages of the BF998 Transistor
Conclusion
Specifications
Datasheets

BF998 Description

Depletion type field effect transistor in a plastic microminiature SOT143B or SOT143R package with source and substrate interconnected. The transistors are protected against excessive input voltage surges by integrated back-to-back diodes between gates and source.

BF998 Overview

The BF998 is a dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) designed for high-frequency amplification and mixing applications. It is commonly used in RF (radio frequency) circuits, particularly in radio receivers and low-noise amplifiers. The BF998 features two separate gate terminals, which allows for independent control of the device's input and output impedance. This makes it well-suited for applications requiring high gain and low noise performance. The transistor is available in a variety of packages, including SOT143 and SOT143R, and is commonly used in radio frequency and communication circuits.

BF998 Pinout

BF998

BF998 CAD Model

Symbol

Footprint

footprint

3D-Model

BF998 Features

*Short channel transistor with high forward transfer

admittance to input capacitance ratio

*Low noise gain controlled amplifier up to 1 GHz.

BF998 Applications

*VHF and UHF applications with 12 V supply voltage,

such as television tuners and professional

communications equipment.

BF998 Alternatives

BF960 - Dual gate MOSFET
BF981 - Dual gate MOSFET
BF992 - Dual gate MOSFET
BF862 - Single gate MOSFET
BF256A - N-channel JFET

BF998 Typical Application Circuit

Gain control test circuit atf = 200 MHz.

Gain control test circuit atf = 800 MHz.

BF998 Functional Block Diagram

BF998 Package and Dimension

SOT143B

How to use the BF998

Advantages of the BF998 Transistor

Conclusion

Specifications

Manufacturer :: NXP Semiconductors

Product Category :: Transistors - FETs, MOSFETs - RF

Current - Test :: 10 mA

Current Rating (Amps) :: 30mA

Frequency :: 200MHz

Gain :: -

Noise Figure :: 0.6dB

Package / Case :: TO-253-4, TO-253AA

Power - Output :: -

Product Status :: Obsolete

Supplier Device Package :: SOT-143B

Transistor Type :: N-Channel Dual Gate

Voltage - Rated :: 12 V

Voltage - Test :: 8 V

Datasheets

Datasheets: BF998,235

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