Thyristors - TRIACs

Part Number	Description / PDF	Quantity
NTE5620 NTE Electronics, Inc.	TRIAC-8A 800V TO-220F	415
NTE56045 NTE Electronics, Inc.	TRIAC-500VRM 16A FULL-PAK	236
NTE56065 NTE Electronics, Inc.	TRIAC-600VRM 12A ISOLATED	949
NTE5610 NTE Electronics, Inc.	TRIAC-800VRM 8A GATE	704
NTE5636 NTE Electronics, Inc.	TRIAC-500VRM 10A	72
NTE5604 NTE Electronics, Inc.	TRIAC-300VRM 4A	126
NTE56041 NTE Electronics, Inc.	TRIAC-600VRM 4A	77
NTE5685 NTE Electronics, Inc.	TRIAC 400V 25A TO48	4
NTE56067 NTE Electronics, Inc.	TRIAC-800VRM 16A	847
NTE56058 NTE Electronics, Inc.	TRIAC-500VRM 16A FULLPACK	524
NTE5606 NTE Electronics, Inc.	TRIAC-500VRM 4A	134
NTE56052 NTE Electronics, Inc.	TRIAC SENS GATE 600V 8A TO220	374
NTE5688 NTE Electronics, Inc.	TRIAC 200V 40A PRESS FIT	34
NTE5601 NTE Electronics, Inc.	TRIAC-50VRM 4A	64
NTE56059 NTE Electronics, Inc.	TRIAC-600VRM 16A FULLPACK	250
NTE56039 NTE Electronics, Inc.	TRIAC-500VRM 4A	128
NTE5684 NTE Electronics, Inc.	TRIAC 300V 25A TO48	2
NTE5632 NTE Electronics, Inc.	TRIAC-100VRM 10A	206
NTE5609 NTE Electronics, Inc.	TRIAC-600VRM 8A GATE	118
NTE5638-08 NTE Electronics, Inc.	TRIAC-800V 8AMP ISO-TO220	312

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.