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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T405Q-600B-TR

Name: T405Q-600B-TR
Brand: STMicroelectronics
SKU: T405Q-600B-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T405Q-600B-TR

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: T405Q-600B-TR.pdf

Description:: TRIAC SENS GATE 600V 4A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:102,805

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Product details

Overview

T405Q-600B-TR from STMicroelectronics is a 4 A, 600 V sensitive quadrants I–IV triac in DPAK package, with quadrant-dependent gate trigger current (5 mA for I/II/III, 10 mA for IV), designed for direct MCU-driven AC load switching in compact home appliance motor and lighting control circuits.

For engineers reviewing the T405Q-600B-TR datasheet, T405Q-600B-TR pinout, T405Q-600B-TR application, or T405Q-600B-TR equivalent, key selection criteria include gate sensitivity across all four quadrants, 35 A non-repetitive surge rating, thermal resistance (R_th(j-c) = 3 °C/W), DPAK mechanical footprint, and ECOPACK®2 compliance for industrial-grade reliability.

Technical Context

This triac operates as a bidirectional AC switch with full four-quadrant triggering capability, enabling gate drive from both polarities of main terminal A2 relative to A1. Its low 5 mA I_GT in quadrants I–III supports direct microcontroller GPIO interfacing without external amplification.

It features robust transient immunity: 700 V non-repetitive off-state surge voltage (V_DSM/V_RSM), 10 V/µs dV/dt at 125 °C, and 50 A/µs critical dI/dt rating - ensuring reliable commutation in inductive motor and pump loads under noisy line conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(rms)	4 A - continuous RMS on-state current rating at Tc = 110 °C, defining maximum steady-state load handling in fan or valve drivers
VDRM / VRRM	600 V - peak repetitive off-state blocking voltage, suitable for 230 VAC mains with safety margin
IGT (QI–III / QIV)	5 / 10 mA - gate trigger current threshold enabling direct MCU GPIO drive without buffer stage in most quadrants
ITSM (tp = 20 ms)	35 A - non-repetitive surge current capacity, supporting motor startup inrush and pump stall transients
Rth(j-c)	3 °C/W - junction-to-case thermal resistance, enabling high-power dissipation with minimal heatsink requirement in DPAK
VTM @ 5 A	1.5 V max - on-state voltage drop at 5 A, determining conduction loss and self-heating in continuous operation
dV/dt @ 125 °C	10 V/µs min - immunity to false triggering from fast line transients in dimmer or motor phase-control applications

Pinout & Package

DPAK (TO-252) surface-mount package with isolated tab (A2), standard 3-pin layout optimized for thermal performance and PCB assembly. Tab is electrically connected to main terminal A2.

Pin/Terminal	Circuit Role	Design Meaning
A2	Main Terminal 2	High-current AC output terminal; electrically tied to exposed metal tab for thermal conduction and electrical connection
A1	Main Terminal 1	High-current AC return path; referenced to load neutral or line depending on circuit topology
G	Gate	Control input accepting low-current trigger pulses; polarity-sensitive for quadrant-specific firing

Key Features

Feature	Design Value
Four-quadrant sensitivity	5 mA I_GT in QI–III enables universal triggering from any AC phase/gate polarity combination
MCU direct drive	No external gate driver required - compatible with 3.3 V/5 V microcontroller outputs driving resistive gate load
ECOPACK®2 compliance	Lead-free, RoHS-compliant construction with UL94 V0 epoxy, meeting global environmental and safety standards
High surge robustness	35 A ITSM (20 ms) and 700 V VDSM support repeated overloads in motor and pump applications

Applications

Fan Speed Control

Lighting Dimmer

Use Scenario: Variable-speed AC fan in HVAC or portable air purifiers using phase-angle control.

IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by zero-crossing synchronized PWM to modulate power delivered to induction motor.

Use Value: Enables smooth speed regulation with low EMI due to controlled turn-on timing and 10 V/µs dV/dt immunity.

Use Scenario: Leading-edge dimming of incandescent or halogen lamps in residential lighting systems.

IC Role / Device Role / Timing Role: Main switching element in TRIAC-based dimmer circuit, fired after adjustable delay from zero-crossing.

Use Value: 5 mA gate sensitivity allows direct microcontroller timing control without gate driver, reducing BOM count.

Pump & Valve Driver

Mahjong Machine Actuator

Use Scenario: Intermittent AC solenoid valve or small water pump in smart appliances or vending systems.

IC Role / Device Role / Timing Role: Solid-state relay replacement providing contactless, wear-free switching of inductive loads.

Use Value: 35 A ITSM handles pump startup surges; 50 A/µs dI/dt rating prevents false turn-off during rapid current rise.

Use Scenario: Electromechanical actuation of tile shuffling mechanisms in automated mahjong tables.

IC Role / Device Role / Timing Role: Compact, thermally efficient AC switch controlling 230 VAC solenoids and stepper motor drivers.

Use Value: DPAK package delivers 4 A RMS in space-constrained PCB layouts while maintaining R_th(j-c) = 3 °C/W for stable long-term operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensitive triac applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BT134-600D	Same 4 A/600 V rating but 10 mA I_GT across all quadrants; higher 15 mA holding current	Limited to lower-sensitivity designs; less suitable for direct 3.3 V MCU drive	Select when gate drive strength exceeds 10 mA and board-level noise immunity is prioritized over ultra-low I_GT
T405-600B	Non-sensitive variant requiring 50 mA I_GT; lacks quadrant IV sensitivity	Requires external gate driver; incompatible with true 4Q MCU control schemes	Choose only if legacy design uses buffered gate drive and quadrant IV operation is unused

Compared with BT134-600D and T405-600B, the T405Q-600B-TR uniquely supports direct 3.3 V/5 V MCU triggering across all four quadrants with lowest gate current (5 mA), making it optimal for space- and cost-constrained smart appliance control where flexible phase control and minimal external components are critical.

Availability

T405Q-600B-TR is available at Aetrix Electronics and suitable for fan speed controllers, lighting dimmers, and pump/valve drivers requiring stable component supply and long-lifecycle availability in consumer and industrial markets.

Supply support for T405Q-600B-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative silicon solutions for automotive, industrial, and consumer applications.

The T405Q series belongs to ST's high-reliability sensitive triac product line, engineered specifically for compact, low-component-count AC load control in cost-sensitive home appliances and electromechanical systems.

FAQ

What is the maximum junction temperature for continuous operation?

The T405Q-600B-TR has a maximum operating junction temperature (T_j) of +125 °C. This limit applies under steady-state conditions with case temperature maintained at or below 110 °C per the absolute maximum ratings table. Thermal derating is required above this point to avoid permanent degradation.

Can this triac be used with 3.3 V microcontrollers without a gate driver?

Yes - its 5 mA I_GT in quadrants I–III allows direct drive from 3.3 V GPIO pins using a simple 680 Ω series resistor (ensuring ≥5 mA at 3.3 V – V_GT). Quadrant IV requires 10 mA, still achievable with most modern MCUs under typical V_OH conditions.

Is the DPAK tab electrically isolated or connected to a terminal?

The DPAK metal tab is electrically connected to main terminal A2, not isolated. This must be accounted for in PCB layout - A2 must be routed to a copper pour or heatsink at the same potential, and isolation barriers must exclude the tab area.

What does the "Q" in T405Q-600B-TR signify?

The "Q" denotes four-quadrant sensitivity: gate trigger current is specified separately for quadrants I–III (5 mA) and quadrant IV (10 mA), distinguishing it from standard triacs with uniform I_GT or non-sensitive variants requiring higher gate current across all modes.

T405Q-600B-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 600 V

Current - On State (It (RMS)) (Max):: 4 A

Voltage - Gate Trigger (Vgt) (Max):: 1.3 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 35A, 38A

Current - Gate Trigger (Igt) (Max):: 5 mA

Current - Hold (Ih) (Max):: 10 mA

Configuration:: Single

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

T405Q-600B-TR FAQ

1.How can I place an order for T405Q-600B-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for T405Q-600B-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for T405Q-600B-TR reliable?

The price and inventory of T405Q-600B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T405Q-600B-TR is usually 5 days.

3.What payment methods are accepted for T405Q-600B-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T405Q-600B-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T405Q-600B-TR?

T405Q-600B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T405Q-600B-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for T405Q-600B-TR?

For technical support, including T405Q-600B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T405Q-600B-TR requirements.

6.How does Aetrix verify that T405Q-600B-TR is sourced from the original manufacturer or authorized distributors?

All T405Q-600B-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that T405Q-600B-TR meets industry standards.

7.What is the process for return or replacement of T405Q-600B-TR?

All T405Q-600B-TR units undergo pre-shipment inspection (PSI). If there is an issue with T405Q-600B-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The T405Q-600B-TR part is unused and in its original packaging.

Return procedure for T405Q-600B-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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