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Package/case Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A specialized enclosure designed specifically for thyristor and triac semiconductor devices, serving as the primary protective structure that isolates the semiconductor die from environmental factors while facilitating electrical connections, heat dissipation, and mechanical mounting. The package/case ensures proper electrical insulation between the semiconductor and external circuits, manages thermal energy generated during operation through heat sinks or thermal interfaces, and provides structural integrity for handling and installation in various industrial applications.

Working Principle

The package/case functions as a multi-layer protective system: the inner cavity houses the semiconductor die with bonding wires connecting to external leads; insulating materials prevent electrical leakage; thermal conductive materials transfer heat from the die to external heat sinks; and the external structure provides mechanical mounting points and environmental sealing. During operation, it maintains electrical isolation between high-voltage terminals while efficiently conducting heat away from the semiconductor junction to prevent thermal runaway.

Materials

Typically composed of: ceramic (alumina or aluminum nitride) for high-voltage insulation and thermal conductivity, copper or copper alloys for lead frames and thermal bases, silicone gel or epoxy for internal encapsulation, and plastic (PPS, PBT, or epoxy molding compound) for external housing. High-power versions may include direct copper bonding (DCB) substrates and silver-filled die attach materials.

Technical Parameters

Package Type TO-220, TO-247, TO-3P, SOT-223, D2PAK
Lead Material Copper alloy with tin plating
Mounting Type Through-hole or surface mount
Current Rating 10A to 100A
Voltage Rating 600V to 1600V
Isolation Voltage 2500V to 4000V
Thermal Resistance 0.5 to 2.5 °C/W
Operating Temperature -40°C to 150°C

Standards

IEC 60747, JEDEC MS-012, ISO 9001, UL 94

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Package/case.

Parent Products

This component is used in the following industrial products

Thyristor/Triac

A semiconductor switching device used for controlling AC power in solid state relays.

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal overstress leading to device failure
Electrical insulation breakdown
Mechanical cracking under thermal cycling
Corrosion of external leads
Improper mounting causing thermal interface issues

FMEA Triads

Trigger: Insufficient thermal interface material
Failure: Overheating and thermal runaway
Mitigation: Use proper thermal grease/pads and ensure adequate mounting pressure

Trigger: Mechanical stress during installation
Failure: Cracked package or broken leads
Mitigation: Follow torque specifications and avoid bending leads after formation

Trigger: Environmental contamination
Failure: Corrosion and electrical leakage
Mitigation: Use conformal coating in harsh environments and proper sealing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Lead position tolerance ±0.2mm, package dimensions ±0.1mm

Test Method

Visual inspection per IPC-A-610, thermal cycling test per JESD22-A104, high-potential test per IEC 60112

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between thyristor and triac packages?

Thyristor packages typically have three terminals (anode, cathode, gate) while triac packages have three terminals (MT1, MT2, gate) but both use similar package styles. The main difference is in internal construction and terminal arrangement rather than external package design.

Can different package types be interchangeable?

No, package types are not directly interchangeable due to differences in pin configuration, mounting requirements, and thermal characteristics. However, devices with the same package type (e.g., TO-220) from different manufacturers are generally interchangeable if electrical specifications match.

How important is thermal resistance in package selection?

Critical. Lower thermal resistance allows better heat dissipation, enabling higher current ratings and improved reliability. Proper heat sinking must be considered based on the package's thermal characteristics.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Package/case