MT-TO3PB Silicone Cap Sleeve for Power Semiconductor Protection
MT-TO3PB Silicone Cap Sleeve is a high-performance thermal interface and insulation component manufactured from a composite of silicone rubber and glass fiber using a specialized molding process.
The MT-TO3PB Silicone Cap Sleeve (ZS-MT-3PB series) is a high-performance thermal interface and insulation component manufactured from a composite of silicone rubber and glass fiber using a specialized molding process. Designed for demanding electronic thermal management environments, it combines excellent thermal conductivity, electrical insulation, mechanical strength, and shock resistance, making it ideal for high-power semiconductor applications.
It is widely used for direct installation on heat sinks or heat pipes, ensuring stable thermal transfer and reliable insulation protection for sensitive electronic components.
Product Overview
The MT-TO3PB Silicone Cap Sleeve is engineered to solve thermal dissipation and insulation challenges in power electronics. Its reinforced structure improves durability under thermal cycling and mechanical stress, while maintaining stable performance in high-voltage environments.
Key Advantages
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High thermal conductivity for efficient heat dissipation
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Strong electrical insulation performance
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Excellent shock and vibration resistance
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Easy installation directly on heat pipe or heat sink
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UL-94 V-0 flame retardant safety grade
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Stable performance under wide temperature range
Typical Applications
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Heating transistors
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Diodes and triodes
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IGBT and MOSFET field-effect tubes
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Power modules requiring thermal interface insulation
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Industrial electronic control systems
Product Parameters
| Test Item | Standard | Unit | MT-3PB Value |
|---|---|---|---|
| Color | Visual | — | Gray / Blue / Yellow |
| Specific Gravity | ASTM D792 | g/cm³ | 1.7 |
| Hardness | ASTM D2240 | A | 85 ± 5 |
| Tensile Strength | ASTM D412 | kg/cm² | >180 |
| Electrical Strength | ASTM D149 | kV/mm | 4.0 |
| Continuous Operating Temperature | — | ℃ | -30 to 200 |
| Flame Rating | UL-94 | — | V-0 |
| Thermal Conductivity | ASTM D5470 | W/m·K | 1.0 |
| Thermal Resistance | ASTM D5470 | ℃/W | 0.28 |
Mechanical Dimensions (TO-3PB Specification)
| Dimension | Value (mm) |
|---|---|
| DIM A | 28.8 ± 0.5 |
| DIM B | 18.2 ± 0.5 |
| DIM C | 6.6 ± 0.3 |
| DIM D | 0.8 ± 0.1 |
Material Structure and Performance Benefits
The MT-3PB series uses a silicone + glass fiber reinforced structure, which significantly enhances:
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Thermal stability under continuous operation
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Resistance to mechanical deformation
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Long-term reliability in high-temperature environments
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Electrical isolation between heat-generating components and heat sinks
Recommended Use Conditions
For optimal performance:
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Ensure full surface contact between component and heat sink
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Use in low to medium stress assembly environments (SH series recommended for low stress scenarios)
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Apply within rated voltage and temperature limits
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