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STMicroelectronics T3035H-8T
- Part No.:
- T3035H-8T
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T3035H-8T.pdf
- Description:
- TRIAC ALTERNISTOR 800V 30A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
T3035H-8T from STMicroelectronics is a 30 A, 800 V symmetrical blocking triac in TO-220AB package, rated for 150 °C junction temperature and operating across three triggering quadrants. It delivers high static dV/dt immunity (≥2000 V/µs at Tj = 150 °C), robust commutation (dl/dt)c ≥25 A/ms, and low on-state voltage (VTM ≤1.55 V at 42 A, 25 °C), enabling reliable control of universal motors and resistive heating loads in compact home appliance designs.
For engineers reviewing the T3035H-8T datasheet, T3035H-8T pinout, T3035H-8T application, or T3035H-8T equivalent, key selection criteria include verified 800 V repetitive blocking voltage, 35 mA maximum gate trigger current, thermal resistance Rth(j-c) ≤0.8 °C/W, snubberless operation up to 150 °C, and ECOPACK2 compliance for industrial-grade AC load switching.
Technical Context
This triac implements ST's Snubberless high-temperature technology, supporting full-cycle AC conduction without external snubbers under inductive loads. Its three-quadrant triggering (I, II, III) enables flexible gate drive design while maintaining noise immunity via elevated static dV/dt threshold and enhanced dynamic turn-off margin.
The device is optimized for zero-crossing and phase-angle control topologies in mains-powered systems. Critical parameters-such as 283 A non-repetitive surge rating (16.7 ms), 482 A²s I²t fusing value, and 100 A/µs critical di/dt-define its capability to withstand motor startup transients and heater inrush currents without false triggering or latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 30 A RMS on-state current at Tc = 121 °C - supports continuous heavy AC loads without heatsink derating beyond 121 °C case temp |
| VDRM/VRRM | 800 V repetitive peak off-state voltage - ensures safe operation on 230 VAC mains with ≥2.5× safety margin |
| IGT | 35 mA max gate trigger current - compatible with standard microcontroller GPIO or optotriac drivers without amplification |
| (dl/dt)c | ≥25 A/ms at Tj = 150 °C - enables reliable commutation of universal motors and inductive loads without snubber network |
| dV/dt | ≥2000 V/µs at Tj = 150 °C - prevents false turn-on from EMI or line transients in noisy industrial environments |
| Rth(j-c) | ≤0.8 °C/W junction-to-case thermal resistance - allows direct mounting to compact heatsinks for space-constrained applications |
| VTM | ≤1.55 V at IT = 42 A, 25 °C - minimizes conduction losses and self-heating during sustained load operation |
Pinout & Package
TO-220AB package: insulated metal tab, 3-pin through-hole mount, lead-free plating, halogen-free epoxy (UL94 V0), recommended torque 0.4–0.6 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; polarity defines quadrant operation (A2 positive or negative relative to A1) |
| A2 (MT2) | Main Terminal 2 | High-current AC load path connection; carries full RMS load current and surge peaks up to 283 A |
| G | Gate | Low-energy control input; triggers conduction when IGT ≥5 mA (min) and VGT ≤1.3 V (max) in quadrants I, II, III |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Validated (dl/dt)c ≥25 A/ms and dV/dt ≥2000 V/µs at Tj = 150 °C - eliminates need for external RC snubber components |
| High-temperature reliability | Rated for continuous operation up to 150 °C junction temperature - enables use in sealed enclosures without forced cooling |
| Three-quadrant triggering | Functional in quadrants I, II, and III only - reduces gate drive complexity vs. four-quadrant triacs while maintaining noise immunity |
| ECOPACK2 compliance | Halogen-free, lead-free, RoHS-compliant packaging - meets EU environmental directives for consumer and industrial equipment |
Applications
| Smart AC Plug Control | Water Heater Load Switching |
|---|---|
Use Scenario: Mains-powered smart plug regulating power to connected appliances via MCU-controlled phase-angle dimming. IC Role / Device Role / Timing Role: Main AC switching element handling 230 VAC, 30 A resistive loads with precise zero-crossing synchronization. Use Value: Eliminates snubber components and reduces PCB area by 35% versus legacy triacs requiring external protection networks. | Use Scenario: On/off and power-level control of immersion heaters in tank-based water heating systems. IC Role / Device Role / Timing Role: High-current AC line switch managing inrush-limited 3 kW heating elements with thermal runaway prevention. Use Value: Sustains 150 °C junction temperature during extended duty cycles, enabling smaller heatsink volume (≤15 cm³) vs. standard 125 °C-rated triacs. |
| Universal Motor Speed Control | Inrush Current Limiting |
Use Scenario: Variable-speed control of vacuum cleaner or power tool motors using phase-cut AC drive. IC Role / Device Role / Timing Role: Bidirectional main switch triggered in quadrants I and III to manage motor back-EMF and commutation spikes. Use Value: Robust (dl/dt)c ≥25 A/ms prevents false turn-off during brush-commutator arcing, extending motor controller lifetime. | Use Scenario: Soft-start circuit limiting inrush into bridge rectifiers feeding large bulk capacitors in AC/DC PSUs. IC Role / Device Role / Timing Role: Controlled ramp-up of conduction angle over first 5–10 AC cycles to limit peak input current. Use Value: Withstands 283 A non-repetitive surge (16.7 ms) without degradation, eliminating need for NTC thermistors or active pre-charge circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTB36-800BW | Same 30 A/800 V rating but 4-quadrant triggering; lower dV/dt (1000 V/µs) and no specified (dl/dt)c at 150 °C | Suitable for simpler gate drive but requires external snubber for inductive loads | Select if gate driver lacks polarity control; avoid for universal motor control without added protection |
| Q6035LH4 | 35 A/600 V rating; higher RMS current but lower blocking voltage; (dl/dt)c = 20 A/ms at 125 °C only | Limited to 230 VAC systems with <600 V transients; not rated for 150 °C continuous operation | Prefer for higher-current resistive loads where voltage margin is sufficient and thermal budget is relaxed |
Compared with BTB36-800BW and Q6035LH4, the T3035H-8T uniquely combines 800 V blocking, 150 °C operation, and snubberless commutation-making it the only choice for compact, thermally constrained universal motor and heater control in EN 61000-4-4 compliant designs.
Availability
T3035H-8T is available at Aetrix Electronics and suitable for home automation smart plugs, water heater load switching, and universal motor speed control requiring stable component supply and long-term industrial availability.
Supply support for T3035H-8T 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The T3035H-8T belongs to ST's Snubberless Triac family, engineered specifically for high-temperature, high-noise AC load control in space- and reliability-critical home appliances and industrial equipment.
FAQ
What is the maximum allowable case temperature for continuous 30 A RMS operation?
The datasheet specifies IT(RMS) = 30 A at Tc = 121 °C. Operation above this temperature requires linear derating per Figure 2; at Tc = 135 °C, maximum RMS current drops to ~24 A. Thermal design must maintain case temperature ≤121 °C under worst-case ambient and airflow conditions to sustain full rated current.
Can the T3035H-8T be used without a heatsink in free-air convection?
No. At Ta = 50 °C with no heatsink, Figure 3 shows IT(RMS) ≤3.5 A. For 30 A operation, a heatsink with Rth(c-a) ≤15 °C/W is required (per Figure 6). The device's Rth(j-a) = 60 °C/W prohibits unheatsinked use in any application demanding >3 A RMS current.
Does the triac support gate triggering in Quadrant IV?
No. The T3035H-8T is explicitly rated for triggering in Quadrants I, II, and III only. Quadrant IV (A2 negative, G positive) is not characterized or guaranteed per Table 2 and Figure 7. Using QIV may result in inconsistent turn-on behavior or premature failure due to unvalidated gate characteristics.
What is the minimum gate trigger current at 150 °C junction temperature?
Per Figure 7, IGT increases with temperature. At Tj = 150 °C, normalized IGT/Q3 is ~2.2× the 25 °C value. Since max IGT at 25 °C is 35 mA, the worst-case min IGT at 150 °C is approximately 5 mA × 2.2 = 11 mA. Gate drive must supply ≥12 mA to ensure reliable triggering across full temperature range.
T3035H-8T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 30 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 283A, 270A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 60 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
T3035H-8T FAQ
1.How can I place an order for T3035H-8T through Aetrix?
Please submit a Request for Quotation (RFQ) for T3035H-8T 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 T3035H-8T reliable?
The price and inventory of T3035H-8T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T3035H-8T is usually 5 days.
3.What payment methods are accepted for T3035H-8T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T3035H-8T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T3035H-8T?
T3035H-8T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T3035H-8T 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 T3035H-8T?
For technical support, including T3035H-8T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T3035H-8T requirements.
6.How does Aetrix verify that T3035H-8T is sourced from the original manufacturer or authorized distributors?
All T3035H-8T 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 T3035H-8T meets industry standards.
7.What is the process for return or replacement of T3035H-8T?
All T3035H-8T units undergo pre-shipment inspection (PSI). If there is an issue with T3035H-8T, 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 T3035H-8T part is unused and in its original packaging.
Return procedure for T3035H-8T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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