Thyristors - TRIACs

Part Number	Description / PDF	Quantity
NTE56030 NTE Electronics, Inc.	TRIAC-400VRM 40AMP	230
NTE5681 NTE Electronics, Inc.	TRIAC 50V 25A TO48	6
NTE5655 NTE Electronics, Inc.	TRIAC SENS GATE 200V 800MA TO92	23892
NTE56015 NTE Electronics, Inc.	TRIAC-200VRM 25A TO220	98
NTE56006 NTE Electronics, Inc.	TRIAC-400VRM 15A	588
NTE56068 NTE Electronics, Inc.	TRIAC-600VRM 16A ISOLATED	776
NTE5657 NTE Electronics, Inc.	TRIAC SENS GATE 600V 800MA TO92	31052
NTE56008 NTE Electronics, Inc.	TRIAC-600VRM 15A	79
NTE5642 NTE Electronics, Inc.	TRIAC 400V 2.5A TO5	44
NTE56019 NTE Electronics, Inc.	TRIAC-200V 25AMP	145
NTE5643 NTE Electronics, Inc.	TRIAC 600V 2.5A TO5	24
NTE56043 NTE Electronics, Inc.	TRIAC-600V 16A ISOLATED	63
NTE5607 NTE Electronics, Inc.	TRIAC-600VRM 4A	340
NTE5682 NTE Electronics, Inc.	TRIAC 100V 25A TO48	95
NTE56060 NTE Electronics, Inc.	TRIAC-800VRM 16A FULLPACK	79
NTE5671 NTE Electronics, Inc.	TRIAC 800V 16A TO220 FP	748
NTE5629 NTE Electronics, Inc.	TRIAC 400V 4A TO202	351
NTE56049 NTE Electronics, Inc.	TRIAC-500VRM 4A LOW LOGIC	161
NTE5652 NTE Electronics, Inc.	TRIAC SENS GATE 400V 3A TO5	236
NTE56040 NTE Electronics, Inc.	TRIAC-500VRM 4A	187

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.