1000pcs TO-220 TO-3P Silicone Heat Sink Insulator Gasket & Cap

$24.83 USD $30.38 USD

Size Beige TO-220 cap White To-220 cap TO-220 Film TO-3P insulator cap TO-3P Film

1000-Piece Transistor Insulator Kit – TO-220, TO-3P & TO-247 Compatible

Keep your electronic components properly isolated and thermally managed with this comprehensive 1000-piece insulator pack. Designed for TO-220, TO-3P, and TO-247 transistor packages, this kit includes both insulating caps and silicone heat sink gasket films — everything you need to safely mount power transistors, MOSFETs, and voltage regulators to heat sinks without electrical shorts.

Made in Mainland China.

Insulating Caps – Flame Retardant Nylon / PA66

Suitable for M3 screws
White caps: Temperature resistance up to 170°C
Beige caps: Temperature resistance up to 230°C

Cap Dimensions

TO-220 Insulating Cap: A=6mm, B=3.5mm, C=3mm, D=1.5mm, E=1.2mm
TO-3P Insulating Cap: A=8mm, B=3.8mm, C=3mm, D=3mm, E=2mm

Insulation Films – Silicone (0.3mm Thickness)

TO-220 Insulation Film: 13mm × 18mm, Thickness 0.3mm
TO-3P Insulation Film: 20mm × 25mm, Thickness 0.3mm

Key Features

✅ Bulk value pack — 1000 pieces per package, ideal for workshop, repair shops, or DIY enthusiasts
✅ Flame retardant PA66 nylon construction for durability and safety
✅ Silicone film insulators provide excellent dielectric isolation while allowing thermal transfer
✅ Compatible with TO-220, TO-3P, and TO-247 transistor packages
✅ Prevents short circuits between component tabs and heat sinks
✅ Thin 0.3mm film minimises thermal resistance for effective heat dissipation

What's Included

Insulating caps (TO-220 and TO-3P sizes)
Silicone insulation films (TO-220 and TO-3P sizes)
1000 pieces total per package

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Frequently Asked Questions

Q: What transistor packages are compatible with these insulators and caps?

A: This kit includes insulating caps and silicone film gaskets specifically sized for TO-220, TO-3P, and TO-247 transistor packages. These are among the most common power transistor and MOSFET packages used in electronics, making this an extremely versatile bulk pack for PCB assembly and repair work.

Q: What is the difference between the white and beige insulating caps?

A: Both cap types are made from flame retardant nylon (PA66), but they differ in their temperature tolerance. The white caps are rated up to 170°C, while the beige caps offer a higher rating of up to 230°C, making the beige option better suited for high-power or high-temperature applications.

Q: Do the silicone insulation films provide both electrical isolation and thermal conductivity?

A: Yes. The 0.3mm silicone insulation films are designed to electrically isolate the transistor tab from the metal heat sink, preventing short circuits, while still allowing efficient heat transfer between the component and the heat sink for effective thermal management.

Q: What screw size do these insulating caps fit?

A: The insulating caps are designed to fit M3 screws, which is the standard screw size used to mount TO-220 and TO-3P packages onto heat sinks in most electronic circuit assemblies.