The Insulating Mica for TO-264 Transistor Package is a high-quality thermal insulator for power transistors and MOSFETs. It ensures efficient heat transfer to heatsinks while preventing electrical shorts, making it vital for power electronics. It’s a 0.1mm mica sheet that fits TO-264 packages precisely, ensuring reliable operation in amplifiers, power supplies, and motor controllers. Easy to install, it extends device life in DIY and industrial circuits.

Key Features

• Provides excellent electrical insulation to prevent short circuits.
• Transfers heat efficiently from the transistor to the heatsink.
• Fits TO-264 packages with precise 29mm x 22mm dimensions.
• Withstands high temperatures for reliable performance.
• Includes pre-drilled holes for easy mounting.
• Thin 0.1mm profile minimises thermal resistance.

Technical Specifications

• Material: Natural mica.
• Dimensions: 29mm x 22mm x 0.1mm.
• Dielectric Strength: Up to 5kV.
• Thermal Conductivity: ~0.7 W/m·K.
• Temperature Resistance: Up to 500°C.
• Compatibility: TO-264, TO-3PL packages.

Applications

• Insulates MOSFETs in audio amplifiers.
• Protects transistors in power supply units.
• Improves thermal management in motor controllers.
• Supports high-power DIY electronics projects.
• Enhances reliability in industrial inverters.
• Facilitates safe transistor mounting in renewable energy systems.

Usage

• Installation
  • Clean the transistor and heatsink surfaces to remove dust or grease. Apply a thin layer of thermal grease to both sides of the mica insulator.
  • Place the insulator between the TO-264 transistor’s metal tab and the heatsink, aligning pre-drilled holes. Secure with a screw, insulating washer, and nut, ensuring firm but not excessive pressure to avoid cracking the mica.
• Testing
  • Power on the circuit and monitor the transistor’s temperature using a thermal probe or infrared thermometer.
  • Verify the transistor operates within its specified temperature range (e.g., <100°C for most MOSFETs). Check for electrical continuity between the transistor tab and heatsink; there should be none, confirming insulation.
• Troubleshooting
  • Overheating: Ensure thermal grease is applied evenly and the mica is intact. Check for proper mounting pressure.
  • Short circuit: Verify no mica cracks or misalignment. Clean surfaces and reapply grease.
  • Loose mounting: Tighten screws carefully, using insulating hardware to maintain isolation.
• Caution
  • Handle mica gently to avoid cracking, as it’s brittle. Use thermal grease sparingly to prevent a mess or reduced insulation. Ensure the heatsink is isolated from other circuit components to avoid unintended voltage paths. Avoid overtightening screws, which can damage the mica or transistor. Store in a dry place to maintain integrity.