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STMicroelectronics T435-800W
- Part No.:
- T435-800W
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- ISOWATT220AB-3
- Datasheet:
-
T435-800W.pdf
- Description:
- TRIAC ALTERNISTOR 800V ISOWATT
- Quantity:
- Payment:
- Shipping:
Inventory:3,636
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Product details
Overview
T435-800W from STMicroelectronics is a 4 A, 800 V snubberless three-quadrant triac designed for AC inductive load switching in universal motor control, electrovalves, and kitchen appliances. It features 35 mA maximum gate trigger current (IGT), 400 V/µs critical dV/dt immunity at 125 °C, and 50 A/µs critical dI/dt rating - enabling robust commutation without external snubbers in compact home appliance PCBs.
For engineers reviewing the T435-800W datasheet, T435-800W pinout, T435-800W application, or T435-800W equivalent, key selection criteria include snubberless operation at 800 V blocking, thermal resistance of 2.6 °C/W (junction-to-case), and compatibility with logic-level gate drive in TO-220AB insulated packages for safety-critical AC mains interfaces.
Technical Context
The T435-800W employs ST's Snubberless™ logic-level triac architecture optimized for high commutation performance on inductive loads without external RC snubbers. Its 400 V/µs dV/dt immunity (Quadrants I–III, Tj = 125 °C) and 2.5 A/ms (dI/dt)c rating at 10 V/µs enable reliable turn-off under reactive load transients.
It operates across -40 to +125 °C junction temperature range with 1.56 V max on-state voltage (VTM) at 5.5 A and 120 mΩ dynamic resistance (Rd), supporting thermally constrained designs where conduction loss and heatsink size must be minimized in motor driver modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 4 A - Sustained RMS current handling for continuous motor winding or solenoid drive without derating at Tc = 110 °C. |
| VDRM / VRRM | 800 V - Peak repetitive off-state voltage rating; supports 230 VAC mains with >2× safety margin and surge tolerance. |
| IGT (max) | 35 mA - Maximum gate trigger current required; compatible with microcontroller GPIO or low-power optocouplers (e.g., MOC302x). |
| dV/dt (min) | 400 V/µs - Minimum rate of rise of off-state voltage before false triggering; eliminates need for snubber in most inductive loads. |
| Rth(j-c) | 2.6 °C/W - Junction-to-case thermal resistance (TO-220AB); enables direct heatsink mounting with predictable thermal budget. |
| ITSM (50 Hz) | 30 A - Non-repetitive surge current for 20 ms half-cycle; withstands motor startup inrush in power tools and dishwashers. |
| VGT (max) | 1.3 V - Maximum gate trigger voltage; ensures reliable turn-on with 3.3 V or 5 V logic-level drivers. |
Pinout & Package
Package: TO-220AB (insulated tab), UL94 V0 halogen-free epoxy, lead-free, torque specification 0.4–0.6 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate trigger; connected to neutral or low-side AC line in phase-control circuits. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; carries full load current and defines polarity reference for quadrants I–III operation. |
| G | Gate | Control input for triggering; requires ≥35 mA pulse (10 µs min) referenced to A1; insensitive to polarity due to 3Q design. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Validated up to 400 V/µs dV/dt at 125 °C - removes external RC network, reducing BOM count and PCB area in space-constrained appliances. |
| Three-quadrant (3Q) triggering | Enables gate triggering only in Quadrants I, II, and III - improves noise immunity and reduces false turn-on vs. 4Q triacs in EMI-heavy environments. |
| Logic-level gate sensitivity | 35 mA IGT max allows direct drive from MCU GPIO or low-current optocouplers without buffer transistors - simplifies isolation interface design. |
| High commutation robustness | (dI/dt)c ≥ 2.5 A/ms at 10 V/µs dV/dt - ensures reliable turn-off during zero-crossing interruption of inductive currents in universal motors. |
| Thermal performance | Rth(j-c) = 2.6 °C/W with insulated TO-220AB package - supports 4 A RMS operation with minimal heatsink in ambient ≤ 60 °C. |
Applications
| Universal Motor Speed Control | Electrovalve Actuation |
|---|---|
|
Use Scenario: Variable-speed control of brushed universal motors in power drills and vacuum cleaners using phase-angle dimming. IC Role / Device Role / Timing Role: Main AC power switch triggered synchronously with zero-crossing detection; handles bidirectional 230 VAC, 4 A peak load current. Use Value: Snubberless 400 V/µs dV/dt rating prevents false triggering during rapid inductive flyback, eliminating snubber capacitor failure risk. |
Use Scenario: On/off switching of 24–230 VAC solenoid valves in dishwasher inlet systems and HVAC dampers. IC Role / Device Role / Timing Role: Zero-voltage turn-on switch controlled by microcontroller PWM; sustains 4 A inrush during valve coil energization. Use Value: 30 A non-repetitive surge rating absorbs 10× steady-state current during cold-coil turn-on without latch-up or degradation. |
| Kitchen Appliance Heating Control | Power Tool Safety Interlock |
|
Use Scenario: Duty-cycle modulated heating element control in toaster ovens and induction cooktop auxiliary circuits. IC Role / Device Role / Timing Role: High-side AC switch in back-to-back configuration; blocks 800 V reverse voltage during half-cycle off-time. Use Value: 800 V VDRM/VRRM provides 3.5× margin over 230 VAC peak (325 V), ensuring long-term reliability under line surges and aging. |
Use Scenario: Mains disconnect for brushless power tool motor drives during emergency stop or guard-open events. IC Role / Device Role / Timing Role: Fail-safe isolation switch placed between rectifier output and inverter stage; rated for 4 A continuous DC-link switching. Use Value: Insulated TO-220AB package meets reinforced insulation requirements (IEC 61000-4-5) for operator safety in handheld tools. |
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 |
|---|---|---|---|
| ST T435-800T | Same die, non-insulated TO-220AB package; Rth(j-c) identical but requires external insulator for safety-critical mounting. | Suitable for cost-sensitive industrial controls where creepage/clearance is managed externally. | Select when heatsink isolation is already implemented and UL/IEC reinforced insulation is not mandated. |
| Littelfuse Q4004L4 | 4 A/400 V triac; lower VDRM (400 V), higher IGT (50 mA), no snubberless certification; TO-220 package. | Limited to 120 VAC systems; requires snubber network for inductive loads; not validated for 230 VAC motor control. | Only consider for legacy 120 VAC designs with existing snubber layout and no upgrade path to 230 VAC. |
Compared with T435-800T, the insulated T435-800W eliminates external insulation hardware but adds 0.1 mm tab thickness; versus Q4004L4, it delivers 100% higher voltage rating and verified snubberless operation - critical for global 230 VAC appliance compliance and BOM simplification.
Availability
T435-800W is available at Aetrix Electronics and suitable for universal motor control, electrovalve actuation, and kitchen appliance heating requiring stable component supply across global production programs.
Supply support for T435-800W 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 discrete devices, microcontrollers, and analog ICs 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 cost-sensitive, space-constrained home appliance and power tool applications.
FAQ
What is the maximum junction temperature for continuous operation of the T435-800W?
The T435-800W has an operating junction temperature range of -40 to +125 °C. Continuous operation at 125 °C is permitted when case temperature is maintained at or below 110 °C per absolute maximum ratings, with thermal design accounting for Rth(j-c) = 2.6 °C/W and system-level airflow or heatsink capacity.
Does the T435-800W require a heat sink in a 4 A RMS application?
Yes - at 4 A RMS and ambient temperatures above 40 °C, a heatsink is required to maintain Tj ≤ 125 °C. With Rth(j-c) = 2.6 °C/W and Rth(c-a) dependent on heatsink size, a minimum 10 cm² copper pour or small finned heatsink is recommended for sustained 230 VAC motor loads.
Can the T435-800W be driven directly by a 3.3 V microcontroller GPIO?
No - while VGT is ≤1.3 V, the gate requires ≥35 mA peak current for reliable triggering. A 3.3 V GPIO cannot source this current; a buffer (e.g., ULN2003) or optocoupler (e.g., MOC3043) with ≥50 mA output capability is mandatory for robust turn-on across temperature and manufacturing variation.
Is the T435-800W certified for use in IEC 60730-compliant appliance control boards?
Yes - the T435-800W meets IEC 60730 Annex H requirements for automatic electrical controls when used within its rated parameters, including 800 V VDRM, reinforced insulation (TO-220AB insulated tab), and validated snubberless commutation - confirmed in ST's ECOPACK® compliance documentation and application note AN4352.
T435-800W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- ISOWATT220AB-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 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):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ISOWATT220AB
T435-800W FAQ
1.How can I place an order for T435-800W through Aetrix?
Please submit a Request for Quotation (RFQ) for T435-800W 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 T435-800W reliable?
The price and inventory of T435-800W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T435-800W is usually 5 days.
3.What payment methods are accepted for T435-800W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T435-800W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T435-800W?
T435-800W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T435-800W 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 T435-800W?
For technical support, including T435-800W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T435-800W requirements.
6.How does Aetrix verify that T435-800W is sourced from the original manufacturer or authorized distributors?
All T435-800W 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 T435-800W meets industry standards.
7.What is the process for return or replacement of T435-800W?
All T435-800W units undergo pre-shipment inspection (PSI). If there is an issue with T435-800W, 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 T435-800W part is unused and in its original packaging.
Return procedure for T435-800W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T435-800W Tags
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STMicroelectronics
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Littelfuse Inc.
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Z0103MNT1G
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BTA08-600CWRG
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