Thyristors - TRIACs

Image	Part Number	Description / PDF	Quantity	Rfq
	2N6071A PBFREE Central Semiconductor	TRIAC 4A 200V TO-126	0
	2N6071B TIN/LEAD Central Semiconductor	TRIAC 4A 200V TO-126	0
	CQ220-8B Central Semiconductor	TRIAC 8A TO-220	0
	CQ92MT Central Semiconductor	TRIAC 2A TO-92	0
	CQ220I-10B Central Semiconductor	TRIAC A TO-220	0
	CQ202-4NS Central Semiconductor	TRIAC 4A TH TO-202-2	0
	CQ220-8N Central Semiconductor	TRIAC 8A TO-220	0
	CQ92D APM Central Semiconductor	TRIAC 2A TO-92	0
	CQ220-6BS Central Semiconductor	TRIAC 6A TO-220	0
	CQ220I-6NS Central Semiconductor	TRIAC A TO-220	0
	CQ202-4BS Central Semiconductor	TRIAC 4A TH TO-202	0
	2N6073A PBFREE Central Semiconductor	TRIAC 4A 400V TO-126	0
	CQ220-40M Central Semiconductor	TRIAC 40A TO-220	0
	2N6073 PBFREE Central Semiconductor	TRIAC 4A 400V TO-126	0
	CQ220-12B Central Semiconductor	TRIAC 12A TO-220	0
	CQ220I-8D Central Semiconductor	TRIAC A TO-220	0
	CQ220I-12N Central Semiconductor	TRIAC A TO-220	0
	CQ220I-16D Central Semiconductor	TRIAC A TO-220	0
	CQ202-4MS Central Semiconductor	TRIAC 4A TH TO-202-2	0
	2N6073B TIN/LEAD Central Semiconductor	TRIAC 4A 400V TO-126	0

Thyristors - TRIACs

1. Overview

TRIAC (Triode for Alternating Current) is a three-terminal semiconductor device belonging to the thyristor family. It enables bidirectional current flow control in AC circuits through a single gate terminal. As a key component in power electronics, TRIACs are widely used for phase control, switching, and regulation of AC loads. Their ability to conduct current in both directions makes them ideal for applications requiring full-wave control, such as dimmers and motor speed regulators.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Standard TRIAC	General-purpose with moderate gate sensitivity	Light dimmers, heater controls
Sensitive Gate TRIAC	Low gate trigger current ( 5mA)	Microcontroller-driven circuits
Logic Level TRIAC	Compatible with 3.3V/5V logic signals	Smart home automation systems
High dv/dt TRIAC	Enhanced immunity to voltage spikes	Industrial motor drives

3. Structure and Composition

TRIACs feature a four-layer (PNPN) silicon structure with three electrodes: Main Terminal 1 (MT1), Main Terminal 2 (MT2), and Gate (G). The symmetrical design allows bidirectional conduction. Modern TRIACs incorporate:

Dielectric passivation layers for voltage stability
Aluminum gate metallization
Epitaxial silicon wafers with precise doping profiles
Plastic encapsulation (TO-220/TO-92 packages)

4. Key Technical Parameters

Parameter	Description	Typical Range
Breakover Voltage (VBO)	Minimum voltage to initiate conduction	200-1200V
Gate Trigger Current (IGT)	Required gate current for turn-on	5-50mA
Holding Current (IH)	Minimum current to maintain conduction	5-50mA
RMS On-State Current (IT(RMS))	Continuous load current capacity	0.5-50A
dv/dt Rating	Voltage change immunity	10-50V/ s

5. Application Fields

Consumer Electronics: Smart lighting systems, washing machine water level controls
Industrial Automation: AC motor speed controllers, solid-state relays
Power Systems: Voltage regulators, reactive power compensators
Automotive: Electric vehicle charging circuits, HVAC controls
Renewable Energy: Solar inverter AC switching circuits

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Parameters
STMicroelectronics	BT136-600E	600V, 4A, 10mA IGT
ON Semiconductor	Q6015LH	600V, 15A, 15mA IGT
Infineon Technologies	BTA16-600B	600V, 16A, 50mA IGT
Microsemi	MAC97A8	600V, 8A, 5mA IGT

7. Selection Guidelines

Verify VBO exceeds maximum circuit voltage by 20%
IT(RMS) should be 1.5 load current
Match IGT with driver circuit capability
Consider heatsinking requirements
Select dv/dt rating based on load inductance
Use zero-crossing detection for EMI-sensitive applications

8. Industry Trends

Key development trends include:

Integration with SiC/GaN for higher efficiency
Smart packaging with built-in temperature sensors
Miniaturization for space-constrained applications
Improved immunity to electromagnetic interference
AI-driven predictive maintenance in industrial systems

Market growth is driven by smart grid implementations and EV charging infrastructure expansion, with a projected CAGR of 6.8% through 2030.