Q4008LH4 Product Overview

Introduction

The Q4008LH4 is a semiconductor product belonging to the category of high-power silicon controlled rectifiers (SCRs). This component is widely used in various electrical and electronic applications due to its unique characteristics and performance.

Basic Information Overview

• Category: High-power silicon controlled rectifier (SCR)
• Use: The Q4008LH4 is utilized for controlling high power AC loads in applications such as motor drives, industrial heating, and power supplies.
• Characteristics: This SCR features high surge capability, low thermal impedance, and high reliability, making it suitable for demanding applications.
• Package: The Q4008LH4 is available in a TO-220AB package, which provides efficient heat dissipation and mechanical strength.
• Essence: The essence of this component lies in its ability to handle high power levels with precision and reliability.
• Packaging/Quantity: It is typically packaged individually and available in varying quantities based on customer requirements.

Specifications

• Voltage Rating: 400V
• Average On-State Current: 40A
• Gate Trigger Current: 60mA
• Gate Trigger Voltage: 1.5V
• Operating Temperature Range: -40°C to 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220AB

Detailed Pin Configuration

The Q4008LH4 SCR has a standard TO-220AB package with three leads: 1. Anode (A) 2. Cathode (K) 3. Gate (G)

Functional Features

• High Surge Capability: The Q4008LH4 can withstand high surge currents, making it suitable for rugged applications.
• Low Thermal Impedance: This SCR exhibits low thermal impedance, enabling efficient heat dissipation.
• High Reliability: With its robust design, the Q4008LH4 offers high reliability in demanding environments.

Advantages and Disadvantages

Advantages

• High surge capability
• Low thermal impedance
• High reliability
• Precise control over high power AC loads

Disadvantages

• Sensitive to voltage and current spikes
• Requires careful handling during installation

Working Principles

The Q4008LH4 operates based on the principle of controlling the flow of alternating current by triggering the SCR into conduction using a gate signal. Once triggered, the SCR conducts current until the AC cycle reverses or the current falls below the holding current level.

Detailed Application Field Plans

The Q4008LH4 finds extensive use in the following application fields: - Motor Drives: Controlling the speed and direction of motors in industrial and automotive applications. - Industrial Heating: Regulating the power supplied to heating elements in industrial furnaces and ovens. - Power Supplies: Managing the output voltage and current in high-power DC power supply units.

Detailed and Complete Alternative Models

• Q4010LH4: A higher voltage variant with similar characteristics
• Q2008LH4: Lower voltage rating with comparable performance
• Q6012LH4: Higher current handling capacity for heavy-duty applications

In conclusion, the Q4008LH4 SCR serves as a reliable and efficient solution for controlling high-power AC loads across diverse industrial and electronic applications.

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