INDUSTRY COMPONENT

Anode/Cathode terminals

Anode and cathode terminals are critical electrical connection points in thyristors and triacs that control current flow direction and device triggering.

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Component Specifications

Definition
Anode and cathode terminals are the primary electrical interfaces in thyristors and triacs, semiconductor devices used for power control. The anode serves as the positive terminal where conventional current enters, while the cathode is the negative terminal where current exits. These terminals facilitate the bidirectional or unidirectional current flow essential for switching and phase control applications in AC circuits.
Working Principle
The anode and cathode terminals operate based on semiconductor PN junction principles. In thyristors, current flows from anode to cathode when a gate signal triggers the device, maintaining conduction until current drops below the holding threshold. In triacs, these terminals allow bidirectional current control, enabling AC switching by responding to gate pulses in both polarities.
Materials
Copper alloy (typically C11000 or C10100) with tin or silver plating for enhanced conductivity and corrosion resistance. Terminal bodies may use high-temperature thermoset plastics (e.g., phenolic, PBT) for insulation.
Technical Parameters
  • Terminal Type Quick-connect, screw, or solder lug
  • Current Rating 1A to 100A
  • Voltage Rating 50V to 1600V
  • Temperature Range -40°C to +125°C
  • Contact Resistance <5mΩ
  • Insulation Resistance >1000MΩ
Standards
IEC 60747-6, JEDEC JESD77, UL 508

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Anode/Cathode terminals.

thyristor terminals triac terminals anode cathode connections power semiconductor terminals electrical connectors thyristor components Anode/Cathode terminals Anode/Cathode terminals in Electrical Equipment Manufacturing

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.

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Engineering Analysis

Risks & Mitigation
  • Overheating due to high current
  • Poor connection leading to arcing
  • Corrosion affecting conductivity
  • Mechanical stress causing fracture
FMEA Triads
Trigger: Loose terminal connections
Failure: Intermittent operation or complete circuit failure
Mitigation: Use proper torque specifications and periodic inspection
Trigger: Corrosion from environmental exposure
Failure: Increased contact resistance and overheating
Mitigation: Apply protective coatings and use corrosion-resistant materials
Trigger: Thermal cycling stress
Failure: Cracking of terminal insulation or solder joints
Mitigation: Design with thermal expansion compensation and use flexible connections

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1mm for terminal dimensions, ±5% for electrical specifications
Test Method
IEC 60747-6 for semiconductor devices, UL 508 for industrial control equipment

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 anode and cathode terminals in thyristors?

The anode is the positive terminal where current enters, while the cathode is the negative terminal where current exits. In thyristors, conduction occurs from anode to cathode when triggered.

Can anode and cathode terminals be interchanged in triacs?

No, they have specific polarities. However, triacs can conduct current in both directions between MT1 and MT2 terminals (main terminals), with the gate controlling triggering for both polarities.

What materials are used for these terminals?

Typically copper alloys with tin/silver plating for conductivity, with insulating bodies made of high-temperature plastics like phenolic or PBT.

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.

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