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STMicroelectronics T405Q-600H
- Part No.:
- T405Q-600H
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
T405Q-600H.pdf
- Description:
- TRIAC SENS GATE 600V 4A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,009
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Product details
Overview
T405Q-600H from STMicroelectronics is a 4 A, 600 V sensitive quadrants I–IV triac in IPAK package, with quadrant-specific 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 controls and lighting dimmers.
For engineers reviewing the T405Q-600H datasheet, T405Q-600H pinout, T405Q-600H application, or T405Q-600H equivalent, key selection criteria include gate sensitivity across all four quadrants, 38 A non-repetitive surge rating at 16.7 ms, thermal resistance of 3 °C/W (junction-to-case), and ECOPACK®2-compliant lead-free IPAK packaging for high-reliability embedded AC control.
Technical Context
This triac operates as a bidirectional AC switch with full four-quadrant triggering capability, enabling gate drive without external polarity conditioning. Its low 5 mA IGT in quadrants I–III supports direct interfacing with standard GPIOs, while the 10 mA requirement in quadrant IV ensures robust turn-on under reverse-phase conditions.
It features a 700 V non-repetitive surge off-state voltage (VDSM/VRSM), 10 V/µs dV/dt immunity at 125 °C, and dynamic on-state resistance ≤100 mΩ at 125 °C - critical for minimizing conduction loss in thermally constrained fan and pump drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 4 A - continuous RMS current handling for small-motor loads up to ~500 W at 230 VAC |
| VDRM / VRRM | 600 V - blocking voltage rating suitable for 230 VAC mains with safety margin |
| IGT (QI–III / QIV) | 5 / 10 mA - enables direct microcontroller GPIO drive without buffer stage in most quadrants |
| ITSM (tp = 16.7 ms) | 38 A - withstands inrush currents of universal motors and compressor startups |
| Rth(j-c) | 3 °C/W - allows high-power dissipation with minimal heatsink when mounted to PCB copper pour |
| dI/dt (critical) | 50 A/µs - resists false triggering during fast-rising load transients in solid-state relay replacements |
| VTM (ITM = 5 A) | ≤1.5 V - low conduction drop reduces self-heating in sealed enclosure applications |
Pinout & Package
IPAK package: insulated power package with isolated tab, 3-terminal configuration, lead-free, UL94 V0 epoxy, recommended mounting torque 0.4–0.6 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (anode 1) | Reference terminal for gate trigger; connects to load return or neutral side in AC circuits |
| A2 | Main terminal 2 (anode 2) | High-side AC line connection; carries full load current and defines voltage polarity reference |
| G | Gate | Four-quadrant trigger input; accepts low-current pulses to initiate conduction in any AC half-cycle direction |
Key Features
| Feature | Design Value |
|---|---|
| MCU-direct gate drive | 5 mA max IGT in QI–III eliminates need for discrete gate driver transistors in cost-sensitive designs |
| Four-quadrant operation | Guaranteed turn-on with gate pulse applied regardless of A2/A1 voltage polarity or current direction |
| ECOPACK®2 compliance | Lead-free, RoHS-compliant construction with halogen-free epoxy meeting industrial environmental requirements |
| High surge robustness | 38 A ITSM at 16.7 ms supports repeated motor startup cycles without degradation |
Applications
| Fan Speed Control | Pump & Valve Drive |
|---|---|
Use Scenario: Variable-speed AC induction fan in HVAC units or kitchen hoods, controlled via phase-cut dimming. IC Role / Device Role / Timing Role: Bidirectional AC switch enabling precise half-cycle conduction angle control for torque modulation. Use Value: Low 5 mA gate drive simplifies MCU interface; 4 A IT(rms) sustains continuous airflow under dust-loaded conditions. | Use Scenario: On/off and modulated flow control in residential water pumps and solenoid valve actuators. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays, supporting rapid cycling without contact wear. Use Value: 38 A surge rating handles pump startup inrush; IPAK thermal performance maintains reliability in enclosed cabinets. |
| Lighting Dimmer | Mahjong Machine Control |
Use Scenario: Leading-edge dimmer module for incandescent/halogen lamps in smart home wall switches. IC Role / Device Role / Timing Role: Phase-controlled AC switch synchronized to zero-crossing detection for flicker-free dimming. Use Value: Quadrant IV 10 mA IGT ensures reliable turn-on during reverse-phase dimming transitions. | Use Scenario: Motorized tile shuffling and tray positioning in automated mahjong tables. IC Role / Device Role / Timing Role: Compact AC load switch controlling intermittent 230 VAC solenoids and small gearmotors. Use Value: IPAK isolation and 3 °C/W Rth(j-c) enable dense PCB layout without external heatsinks in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive triac applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| T405Q-600B-TR | DPAK package (vs. IPAK); Rth(j-a) = 70 °C/W (vs. 100 °C/W); tape-and-reel packaging | Better thermal coupling to PCB copper; suited for surface-mount automated assembly | Select when board space permits larger footprint and reflow compatibility is required |
| BT134-600D | Lower IT(rms) = 4 A but higher IGT = 15 mA (QI–III); no quadrant IV specification; TO-92 package | Limited to low-power, single-quadrant-triggered loads; unsuitable for MCU-direct QIV operation | Select only for legacy through-hole designs where gate drive margin exceeds 15 mA |
Compared with T405Q-600B-TR and BT134-600D, the T405Q-600H uniquely combines IPAK's mechanical robustness and isolation with guaranteed four-quadrant 5/10 mA triggering - essential for compact, MCU-driven AC control where PCB real estate and gate drive simplicity are prioritized over reflow assembly.
Availability
T405Q-600H is available at Aetrix Electronics and suitable for fan speed controllers, pump drives, lighting dimmers, and mahjong machine motor controls requiring stable component supply and long-term industrial availability.
Supply support for T405Q-600H 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The T405Q-600H belongs to ST's sensitive triac product line, engineered specifically for direct microcontroller interfacing in compact, thermally constrained AC load switching applications - emphasizing low gate drive, four-quadrant reliability, and eco-compliant packaging.
FAQ
What is the maximum junction temperature for continuous operation?
The T405Q-600H has a rated operating junction temperature range of –40 °C to +125 °C. Continuous operation must maintain Tj ≤ 125 °C, achievable with proper heatsinking or PCB copper area per the 3 °C/W Rth(j-c) spec and thermal derating curves in Figure 2 of the datasheet.
Can this triac be used with zero-crossing detection circuits?
Yes - the T405Q-600H supports zero-crossing triggered operation. Its 10 V/µs dV/dt immunity at 125 °C and low 5 mA IGT ensure reliable turn-on when gated near voltage zero, minimizing EMI and inrush stress in lighting and motor control applications.
Is the IPAK package electrically isolated?
Yes - the IPAK package features an electrically isolated metal tab. The tab is not internally connected to any terminal, enabling safe mounting to grounded heatsinks without shorting A2 or requiring insulating hardware in most configurations.
Does the 5/10 mA IGT specification apply across the full temperature range?
No - the 5 mA (QI–III) and 10 mA (QIV) values are maximums at Tj = 25 °C. As shown in Figure 7, IGT increases with junction temperature; at 125 °C, typical IGT rises to ~2× room-temperature value, requiring gate drive design margin accordingly.
T405Q-600H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- IPAK
T405Q-600H FAQ
1.How can I place an order for T405Q-600H through Aetrix?
Please submit a Request for Quotation (RFQ) for T405Q-600H 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-600H reliable?
The price and inventory of T405Q-600H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T405Q-600H is usually 5 days.
3.What payment methods are accepted for T405Q-600H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T405Q-600H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T405Q-600H?
T405Q-600H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T405Q-600H 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-600H?
For technical support, including T405Q-600H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T405Q-600H requirements.
6.How does Aetrix verify that T405Q-600H is sourced from the original manufacturer or authorized distributors?
All T405Q-600H 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-600H meets industry standards.
7.What is the process for return or replacement of T405Q-600H?
All T405Q-600H units undergo pre-shipment inspection (PSI). If there is an issue with T405Q-600H, 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-600H part is unused and in its original packaging.
Return procedure for T405Q-600H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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