Structured Manufacturing Data (2026)

Thyristor/Triac

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Thyristor/Triac used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Thyristor/Triac is characterized by the integration of Semiconductor wafer and Gate terminal. In industrial production environments, manufacturers listed on CNFX commonly emphasize Silicon semiconductor construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

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Product Specifications

Technical details and manufacturing context for Thyristor/Triac

Definition
A thyristor (SCR) or triac (bidirectional thyristor) is the core switching component in solid state relays that enables contactless, high-speed switching of AC loads by controlling the gate trigger signal to regulate current flow through the main terminals.
Working Principle
The thyristor/triac operates as a latching semiconductor switch. When a small gate current is applied, it turns on and conducts current between its main terminals until the current drops below the holding current. In SSRs, this enables precise control of AC power to loads without mechanical contacts.
Common Materials
Silicon semiconductor, Copper terminals, Ceramic or plastic packaging
Technical Parameters
  • Maximum forward current rating (A) Per Request
Components / BOM

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Thyristor/Triac.

high power thyristor for industrial relays triac semiconductor AC switching device silicon thyristor with ceramic packaging solid state relay triac components electrical equipment thyristor BOM specifications

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Solid State Relay
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (solid-state device)
other spec: Voltage: 200V to 1600V, Current: 1A to 100A, dv/dt: 50V/μs to 1000V/μs, di/dt: 20A/μs to 500A/μs
temperature: -40°C to +125°C (junction temperature)
Media Compatibility
✓ AC motor control circuits ✓ Lighting dimmer systems ✓ Heating element controllers
Unsuitable: High-frequency switching applications (>1kHz)
Sizing Data Required
  • Maximum load current (RMS)
  • Peak repetitive off-state voltage
  • Required gate trigger current

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal runaway
Cause: Excessive junction temperature due to inadequate heat sinking, overcurrent, or poor thermal management leading to uncontrolled current flow and catastrophic failure.
Gate oxide breakdown
Cause: Voltage spikes exceeding gate-cathode rating, electrostatic discharge (ESD), or aging degradation causing permanent loss of gate control and device malfunction.
Maintenance Indicators
  • Audible arcing or popping sounds during switching cycles
  • Visible discoloration, charring, or bulging of the device package indicating overheating
Engineering Tips
  • Implement proper heatsinking with thermal interface material and ensure adequate airflow to maintain junction temperature below datasheet limits
  • Use snubber circuits (RC networks) across thyristor/triac terminals to suppress voltage transients and dv/dt stresses during switching

Compliance & Manufacturing Standards

Reference Standards
IEC 60747-6: Semiconductor devices - Thyristors ANSI/IEEE C62.41: Surge Withstand Capability (SWC) tests EN 60747-6: Semiconductor devices - Thyristors (CE marking basis)
Manufacturing Precision
  • Forward voltage drop (VTM): +/-5% at rated current
  • Gate trigger current (IGT): +/-20% at specified temperature
Quality Inspection
  • High-Potential (Hi-Pot) dielectric strength test
  • Thermal cycling and power cycling endurance tests

Factories Producing Thyristor/Triac

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 a thyristor and a triac in electrical equipment?

A thyristor (SCR) conducts current in one direction only, while a triac can conduct in both directions, making triacs ideal for AC power control applications in solid state relays and electrical equipment.

What materials are used in thyristor/triac manufacturing?

Thyristors/triacs are primarily made from silicon semiconductor wafers, with copper terminals for electrical connections, and housed in ceramic or plastic packaging for insulation and protection.

How do I select the right thyristor/triac for my electrical equipment application?

Consider voltage/current ratings, switching speed, thermal characteristics, and packaging type. For AC power control in solid state relays, triacs are typically preferred, while thyristors are used for DC or half-wave AC applications.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Electrical Equipment Manufacturing.

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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