BF998 Datasheet, Replacement, Applications

yunying Release time：2023-11-24 Page View：1736

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

Frequently Asked Questions

2N5551 vs BC547 BJTs Comparison

2024-05-05 Page View：2149

The 2N5551 and BC547 are both NPN bipolar junction transistors (BJTs) commonly used in various electronic circuits. While they share some similarities, there are also key differences between them, making them suitable for different applications. This article provides a comprehensive comparison of these two transistors, focusing on their specifica...

LM3914 vs LM3915 vs LM3916 vs LM3917 How They Work?

2024-05-04 Page View：1695

This post is about LM3914 vs LM3915 vs LM3916 vs LM3917 detailed comparison.

Top 12 electronic component distributors 2024

2024-04-25 Page View：6216

Explore the leading electronic component distributors of 2023. From Arrow Electronics to WPG Holdings, discover how top distributors are shaping the global market.

TPS5450DDAR Datasheet, Pinout, Specification

2024-04-22 Page View：551

Understanding the : A Comprehensive GuideThe TPS5450DDAR is a highly integrated, step-down converter with an integrated MOSFET, designed to deliver up to 3A of continuous output current.

C945 Transistor Datasheet:C1815 VS C945 Comparison

2024-04-18 Page View：3138

C945 Transistor Datasheet: Features, Applications, and Comparison with C1815. Learn about the C945's pinout, circuits,operation, and how to use it. C945 VS C1815

Lithium Battery Charger TP4056: Datasheet, Schematic, Price

2024-04-15 Page View：12752

TP4056 charging module: Single-cell Li-ion charger. Find TP4056 datasheet & TP4056 pinout & TP4056 power path circuit here

TDA7265 Audio Amplifier:How To Connect And Test?

2024-04-02 Page View：3065

TDA7265 DatasheetTDA7265 PinoutTDA7265 Circuit DiagramTDA7265 EquivalentTDA7265 ICPriceTDA7265 FeaturesTDA7265 PackageTDA7265 ApplicationsTDA7265 Applications CircuitHow to Connect and TestTDA7265 Audio Amplifier?TDA7265 VS TDA7269VS TDA2050VS TDA7294What isTDA7265?The TDA7265 is a pop...

1n4007 vs 1n5399 Rectifier Diode: Pinout, Datasheet, Specifications

2024-03-30 Page View：5127

**1N4007 vs 1N5399 Rectifier Diode: Pinout, Datasheet, Specifications****Introduction**Rectifier diodes are essential components in electronic circuits, responsible for converting alternating current (AC) to direct current (DC). Among the commonly used rectifier diodes are the 1N4007 and 1N5399.

SN74HC595N vs SN74HC574N Shift Register Datasheet,Specs

2024-03-20 Page View：728

Dear friends，this post will help you make a better choice betweenSN74HC595N vs SN74HC574N for you, and revealShift Register Datasheet,Specs.SN74HC595N:Shift Register 2/6V -40°C~85°C Shift Register 74HC Series 74HC595 16 Pin 5V 16-DIP (0.300, 7.62mm)SN74HC574N:2V~6V 36MHz 8 Bit D-Type Flip Flop DUAL 74...