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STMicroelectronics T405-700B-TR
- Part No.:
- T405-700B-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
T405-700B-TR.pdf
- Description:
- TRIAC SENS GATE 700V 4A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,706
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Product details
Overview
T405-700B-TR from STMicroelectronics is a 4 A, 700 V RMS three-quadrant logic-level triac in DPAK package, designed for AC phase control in inductive loads with low gate trigger current (5 mA max) and high commutation robustness. It enables compact motor control in universal motor appliances such as power tools and dishwashers without external snubber circuits.
For engineers reviewing the T405-700B-TR datasheet, T405-700B-TR pinout, T405-700B-TR application, or T405-700B-TR equivalent, key selection criteria include gate sensitivity (IGT ≤ 5 mA), blocking voltage (VDRM = 700 V), thermal resistance (Rth(j-c) = 2.6 °C/W), and snubberless operation for inductive load switching reliability.
Technical Context
The T405-700B-TR uses ST's Snubberless logic-level technology to achieve high dV/dt immunity (20 V/µs min at 125 °C) and robust commutation without external RC networks. Its three-quadrant operation excludes quadrant I triggering, reducing false turn-on risk in noisy AC environments.
It supports full-cycle AC conduction with IT(rms) = 4 A at Tc = 110 °C and withstands non-repetitive surge currents up to 30 A (50 Hz, 20 ms). Gate drive requires only 5 mA maximum trigger current at 12 V, compatible with microcontroller GPIOs directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 4 A - Sustained AC load current rating at case temperature 110 °C, suitable for continuous motor drive |
| VDRM / VRRM | 700 V - Peak repetitive off-state voltage, enabling use on 230 VAC mains with safety margin |
| IGT (max) | 5 mA - Maximum gate trigger current, allowing direct drive from low-power logic outputs |
| dV/dt (min) | 20 V/µs - Critical rate of rise of off-state voltage at 125 °C, ensuring noise immunity in inductive switching |
| Rth(j-c) | 2.6 °C/W - Junction-to-case thermal resistance, enabling efficient heatsinking in DPAK footprint |
| IL (max) | 10 mA - Maximum latching current, defining minimum load current needed to sustain conduction after trigger |
| IH (max) | 10 mA - Maximum holding current, specifying lowest load current that maintains on-state before turn-off |
Pinout & Package
DPAK (TO-252) surface-mount package with isolated tab; thermally optimized for PCB copper area ≥ 4.95 mm × 6.35 mm per Figure 13; lead-free, halogen-free, UL94 V0 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; connected to load return path in standard triac configuration |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; carries full load current and defines polarity reference for gate control |
| G | Gate | Logic-level control input; triggers conduction when biased positive or negative relative to A1 in quadrants II/III |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Eliminates need for external RC snubber across MT1–MT2 in inductive loads like universal motors |
| Three-quadrant triggering | Enables gate control only in quadrants II and III, improving noise immunity vs. four-quadrant triacs |
| Low IGT (≤5 mA) | Permits direct interface with 3.3 V or 5 V MCU GPIOs without buffer transistors |
| High dI/dt capability (50 A/µs) | Supports fast turn-on into highly inductive loads without commutation failure |
| ECOPACK® compliant | Meets RoHS, halogen-free, and lead-free requirements for industrial and consumer appliance designs |
Applications
| Power Tools | Kitchen Appliances |
|---|---|
Use Scenario: Variable-speed control of universal motors in drills, sanders, and grinders using phase-angle AC dimming. IC Role / Device Role / Timing Role: Main AC power switch regulating RMS voltage delivered to motor windings via gate-triggered conduction windows. Use Value: Enables compact, snubberless motor speed control with minimal BOM count and high reliability under mechanical vibration. |
Use Scenario: On/off and power-level control in dishwasher heating elements and pump motors. IC Role / Device Role / Timing Role: Solid-state relay replacement handling 230 VAC resistive and inductive loads with zero-crossing or phase-control timing. Use Value: Reduces system size vs. electromechanical relays while maintaining >100,000 cycle lifetime and silent operation. |
| Small Home Appliances | Motor Control Circuits |
Use Scenario: Fan speed regulation and heater cycling in vacuum cleaners and coffee makers. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by microcontroller PWM-derived gate pulses synchronized to AC line zero-crossing. Use Value: Delivers precise power delivery with <1% RMS variation across line voltage fluctuations (±10%) and temperature range (−40 to +125 °C). |
Use Scenario: Compact AC motor starter and soft-start circuitry in HVAC blowers and garage door openers. IC Role / Device Role / Timing Role: High-commutation triac managing inrush current and torque ramp-up during motor startup. Use Value: Prevents contact welding and EMI spikes seen with mechanical switches, extending system lifetime in cyclic duty applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT136-700D | 4 A IT(rms), 700 V VDRM, but 15 mA IGT max and no snubberless rating | Requires external snubber for inductive loads; less suitable for space-constrained motor control | Select when cost is primary constraint and board area allows snubber components |
| T410-700B-TR | Same package and voltage, but 10 mA IGT max and higher IL (25 mA) | Less sensitive gate drive; better suited for noisy industrial environments where false triggering must be avoided | Select when gate drive source has limited current capability or higher noise immunity is required over sensitivity |
Compared with BT136-700D, T405-700B-TR eliminates snubber dependency and reduces gate drive burden; versus T410-700B-TR, it trades higher sensitivity for lower latching current, favoring microcontroller-direct control in consumer-grade appliances.
Availability
T405-700B-TR is available at Aetrix Electronics and suitable for power tools, kitchen appliances, and small home appliances requiring stable component supply with long lifecycle support and consistent parametric performance across production batches.
Supply support for T405-700B-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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The T4 series triacs are part of ST's high-reliability AC power switching portfolio, engineered specifically for snubberless operation in universal motor and resistive-inductive load control within cost-sensitive, space-constrained appliances.
FAQ
What is the maximum junction temperature for continuous operation?
The T405-700B-TR has an operating junction temperature range of −40 °C to +125 °C. Continuous operation at Tj = 125 °C is permitted when case temperature is maintained at ≤110 °C per absolute maximum ratings, requiring appropriate PCB copper area and thermal management per Table 6.
Can this triac replace a mechanical relay in a 230 VAC, 2 A resistive load?
Yes - with IT(rms) = 4 A and VDRM = 700 V, the T405-700B-TR safely handles 230 VAC resistive loads up to 4 A. Its snubberless design and low IGT enable direct microcontroller control, offering silent, wear-free switching with >10⁶ cycles versus typical relay lifetimes of 10⁵ mechanical cycles.
Is heatsinking required for 4 A RMS operation?
Yes - at full 4 A IT(rms), junction-to-case thermal resistance is 2.6 °C/W. With Tj(max) = 125 °C and Tc = 110 °C, allowable power dissipation is ~5.8 W. A minimum 5 cm² copper pour (35 µm thick) on FR4 is recommended per Figure 11 to maintain safe thermal margins without additional heatsink.
Does this device support zero-crossing switching?
No - the T405-700B-TR is not a zero-crossing triac. It is a random-phase (instantaneous) switch; conduction begins at gate trigger regardless of AC phase angle. Zero-crossing functionality must be implemented externally via microcontroller timing synchronized to line voltage sensing.
T405-700B-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:
- 700 V
- Current - On State (It (RMS)) (Max):
- 4 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 31A
- 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
T405-700B-TR FAQ
1.How can I place an order for T405-700B-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for T405-700B-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 T405-700B-TR reliable?
The price and inventory of T405-700B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T405-700B-TR is usually 5 days.
3.What payment methods are accepted for T405-700B-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T405-700B-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T405-700B-TR?
T405-700B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T405-700B-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 T405-700B-TR?
For technical support, including T405-700B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T405-700B-TR requirements.
6.How does Aetrix verify that T405-700B-TR is sourced from the original manufacturer or authorized distributors?
All T405-700B-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 T405-700B-TR meets industry standards.
7.What is the process for return or replacement of T405-700B-TR?
All T405-700B-TR units undergo pre-shipment inspection (PSI). If there is an issue with T405-700B-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 T405-700B-TR part is unused and in its original packaging.
Return procedure for T405-700B-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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