Industry-Verified Manufacturing Data (2026)

Thyristor/Triac

Based on aggregated insights from multiple verified 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
  • Semiconductor wafer
    Core switching element with P-N-P-N structure
    Material: Silicon
  • Gate terminal
    Control terminal for triggering conduction
    Material: Copper alloy
  • Anode/Cathode terminals
    Main power terminals for load current
    Material: Copper alloy
  • Package/case
    Protects semiconductor and provides thermal dissipation
    Material: Plastic or ceramic
Engineering Reasoning
600-1600 V blocking voltage, 8-40 A RMS current, -40 to 125 °C junction temperature
Junction temperature exceeds 150 °C, dv/dt > 1000 V/μs, di/dt > 100 A/μs
Design Rationale: Thermal runaway due to positive temperature coefficient of leakage current, exceeding silicon's intrinsic carrier concentration threshold of 1.5×10¹⁰ cm⁻³ at 150 °C
Risk Mitigation (FMEA)
Trigger Voltage transient exceeding 2000 V with rise time < 1 μs
Mode: Gate oxide breakdown causing permanent conduction state
Strategy: RC snubber circuit with 47 Ω resistor and 0.1 μF capacitor parallel to device
Trigger Junction temperature cycling between -40 °C and 125 °C at 10 Hz
Mode: Thermal fatigue cracking of aluminum bond wires at 5000 cycles
Strategy: Copper-clad aluminum bond wires with 50 μm diameter and active thermal management maintaining ΔT < 50 °C

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 DNA

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

Verified manufacturers with capability to produce this product in China

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✓ 97% Supplier Capability Match Found

S Sourcing Manager from Canada Feb 21, 2026
★★★★★
"Found 48+ suppliers for Thyristor/Triac on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
P Procurement Specialist from United States Feb 18, 2026
★★★★☆
"The technical documentation for this Thyristor/Triac is very thorough, especially regarding technical reliability. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from United Arab Emirates Feb 15, 2026
★★★★★
"Reliable performance in harsh Electrical Equipment Manufacturing environments. No issues with the Thyristor/Triac so far."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

16 sourcing managers are analyzing this specification now. Last inquiry for Thyristor/Triac from Mexico (1h ago).

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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 Specifications verified by CNFX Industrial Index (v2.6.03) for Electrical Equipment Manufacturing sector.

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