Cathode Terminal: Temperature Range -55°C to 150°C

Component Specifications

Definition

In power semiconductor devices such as Insulated Gate Bipolar Transistors (IGBTs) and Silicon-Controlled Rectifiers (SCRs), the cathode terminal serves as the negative electrode connection. It is a critical interface for electrical current flow, typically where electrons enter the device during conduction. The terminal is engineered to handle high current densities, manage thermal loads through efficient heat transfer, and maintain electrical isolation where required. Its design ensures reliable performance under switching conditions, contributing to overall device efficiency and longevity in power electronics applications.

Working Principle

The cathode terminal operates based on semiconductor physics, where it acts as the source of electrons in the device. In IGBTs, it connects to the emitter region, allowing current to flow from the collector to the emitter when the gate is triggered. In SCRs, it serves as the negative terminal for the anode-cathode circuit, initiating conduction when a gate signal is applied. The terminal facilitates electron injection into the semiconductor material, enabling controlled switching and power regulation in circuits.

Materials

Typically made from high-conductivity materials such as copper or copper alloys (e.g., C11000, C10100) with plating like nickel or silver to enhance corrosion resistance and solderability. Insulating parts may use ceramics (e.g., alumina) or high-temperature plastics (e.g., PEEK).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Current Rating	Up to 1000A
Voltage Rating	Up to 6500V
Temperature Range	-55°C to 150°C
Contact Resistance	< 1 mΩ
Insulation Resistance	> 1000 MΩ

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, DIN EN 60146

Parent Products

This component is used in the following industrial products

Power Semiconductor Devices (IGBTs/SCRs)

Power semiconductor components (IGBTs/SCRs) for high-voltage, high-current switching and control in industrial applications.

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Engineering Analysis

Risks & Mitigation

Overheating due to poor thermal design
Electrical arcing from high voltage
Corrosion in harsh environments

FMEA Triads

Trigger: Insufficient heat dissipation
Failure: Thermal runaway leading to device failure
Mitigation: Implement proper cooling systems and use materials with high thermal conductivity.

Trigger: Mechanical stress during installation
Failure: Cracked terminal or poor electrical contact
Mitigation: Follow torque specifications and use appropriate mounting techniques.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm for dimensional accuracy, ±5% for electrical parameters

Test Method

Electrical testing per IEC 60747, thermal cycling per MIL-STD-883

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Cathode Terminal

Manufacturer profiles associated with Cathode Terminal.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the function of a cathode terminal in an IGBT?

In an IGBT, the cathode terminal connects to the emitter, allowing electron flow from the collector to complete the circuit when the device is switched on, enabling power control.

Can cathode terminals be interchanged between different semiconductor devices?

No, cathode terminals are device-specific due to variations in electrical ratings, thermal management needs, and physical dimensions; always use manufacturer-recommended parts.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Cathode Terminal