Anode/Cathode terminals: Temperature Range -40°C to +125°C

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

Parameter	Typical range	Notes & selection driver
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

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

Standards

IEC 60747-6, JEDEC JESD77, UL 508

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

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

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Anode/Cathode terminals

Manufacturer profiles associated with Anode/Cathode terminals.

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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 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.

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.

Anode/Cathode terminals