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BC858B-HF
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BC858B-HF: Transistor Encyclopedia Entry

Introduction

The BC858B-HF is a type of transistor that belongs to the category of small signal transistors. This entry provides an overview of its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Basic Information Overview

  • Category: Small Signal Transistor
  • Use: Amplification and switching applications
  • Characteristics: High current gain, low noise, and low power dissipation
  • Package: SOT-23
  • Essence: NPN Bipolar Junction Transistor
  • Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

  • Collector-Base Voltage (VCBO): 30V
  • Collector-Emitter Voltage (VCEO): 25V
  • Emitter-Base Voltage (VEBO): 5V
  • Collector Current (IC): 100mA
  • Power Dissipation (PD): 250mW
  • Transition Frequency (fT): 150MHz
  • Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The BC858B-HF transistor has three pins: 1. Collector (C) 2. Base (B) 3. Emitter (E)

Functional Features

  • High current gain (hFE)
  • Low noise figure
  • Low power dissipation
  • Fast switching speed

Advantages and Disadvantages

Advantages

  • High current gain for amplification
  • Low noise performance
  • Suitable for low-power applications
  • Compact SOT-23 package

Disadvantages

  • Limited collector current compared to other transistors
  • Relatively low breakdown voltage

Working Principles

The BC858B-HF operates based on the principles of bipolar junction transistors. When a small current flows into the base terminal, it controls a much larger current between the collector and emitter terminals, allowing for amplification or switching of signals.

Detailed Application Field Plans

The BC858B-HF is commonly used in the following applications: - Audio amplifiers - Signal amplification circuits - Switching circuits - Oscillator circuits - Sensor interfaces

Detailed and Complete Alternative Models

Some alternative models to the BC858B-HF include: - BC847B - BC846B - 2N3904 - 2N2222A - 2N4401

In conclusion, the BC858B-HF transistor is a versatile component suitable for various amplification and switching applications, offering high current gain, low noise, and compact packaging. Its specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models make it a valuable choice for electronic circuit design.

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10 domande e risposte comuni relative all'applicazione di BC858B-HF nelle soluzioni tecniche

  1. What is the maximum collector current of BC858B-HF?

    • The maximum collector current of BC858B-HF is 100mA.

  2. What is the typical hFE (DC current gain) of BC858B-HF?

    • The typical hFE of BC858B-HF is 110-800 at a collector current of 2mA.

  3. What is the maximum power dissipation of BC858B-HF?

    • The maximum power dissipation of BC858B-HF is 200mW.

  4. What are the typical applications for BC858B-HF?

    • BC858B-HF is commonly used in audio amplification, switching circuits, and general purpose amplification.

  5. What is the voltage rating for BC858B-HF?

    • The voltage rating for BC858B-HF is 30V.

  6. What is the thermal resistance of BC858B-HF?

    • The thermal resistance of BC858B-HF is approximately 250°C/W.

  7. Is BC858B-HF suitable for low noise amplifier applications?

    • Yes, BC858B-HF is suitable for low noise amplifier applications due to its low noise characteristics.

  8. Can BC858B-HF be used in high-frequency applications?

    • Yes, BC858B-HF can be used in high-frequency applications due to its high transition frequency (fT) of 150MHz.

  9. What are the recommended operating conditions for BC858B-HF?

    • The recommended operating conditions for BC858B-HF include a collector current of 10mA, a collector-emitter voltage of 20V, and a power dissipation of 200mW.

  10. Are there any specific layout considerations when using BC858B-HF in a circuit?

    • It is recommended to minimize lead lengths and keep input and output leads as short as possible to reduce parasitic effects when using BC858B-HF in a circuit.