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STMicroelectronics T835H-8I
- Part No.:
- T835H-8I
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T835H-8I.pdf
- Description:
- TRIAC ALTERNISTOR 800V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,759
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Product details
Overview
T835H-8I from STMicroelectronics is an 8 A, 800 V insulated triac in TO-220AB package, designed for robust AC load switching in high-temperature environments up to 150 °C junction temperature. It features three-quadrant triggering, 2.5 kV RMS insulation rating, and Snubberless™ technology enabling snubber-free operation with dV/dt immunity ≥2000 V/µs and (dl/dt)c ≥8 A/ms at Tj = 150 °C - ideal for motor and heater control in home appliances.
For engineers reviewing the T835H-8I datasheet, T835H-8I pinout, T835H-8I application, or T835H-8I equivalent, key selection criteria include its 8 A RMS current rating, 800 V blocking voltage, 35 mA gate trigger current, insulated package for enhanced safety, and high-noise-immunity commutation performance in constrained thermal environments.
Technical Context
The T835H-8I is a bidirectional thyristor optimized for phase-controlled AC switching without external snubbers. Its Snubberless™ architecture delivers guaranteed turn-off commutation margin (dl/dt)c ≥8 A/ms and static dV/dt ≥2000 V/µs at maximum junction temperature, supporting reliable operation under fast transient conditions in inductive loads like universal motors.
It operates across all three triggering quadrants (I, II, III), with gate trigger current IGT specified from 5 mA (min) to 35 mA (max) and latching current IL ≤80 mA in quadrant II. The internal ceramic insulation provides 2.5 kV RMS isolation between main terminals and heatsink-mounting surface, meeting UL1557 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A - continuous RMS on-state current at Tc = 130 °C, defining maximum steady-state load handling capability |
| VDRM / VRRM | 800 V - repetitive peak off-state voltage, ensuring safe blocking of standard 230 VAC mains with margin |
| IGT | 35 mA max - maximum gate trigger current required to initiate conduction, enabling compatibility with low-power drivers |
| (dl/dt)c | 8 A/ms min at Tj = 150 °C - critical rate of decrease of on-state current without commutation failure, enabling snubberless motor control |
| dV/dt | 2000 V/µs min at Tj = 150 °C - static voltage transient immunity, preventing false triggering in noisy EMI environments |
| VINS | 2.5 kV RMS - insulation withstand voltage for 1 minute, certifying safe mounting on grounded heatsinks |
| Rth(j-c) | 2.2 °C/W max - junction-to-case thermal resistance, enabling precise heatsink sizing for thermal management |
Pinout & Package
Package: TO-220AB insulated - molded in halogen-free, UL94-V0 resin with internal ceramic insulation barrier; lead-free plating; recommended mounting torque 0.4–0.6 N·m; case temperature limit 130 °C for full 8 A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; connected to load return path in most phase-control circuits |
| A2 (MT2) | Main Terminal 2 | High-side main current path; polarity reversal relative to A1 defines conduction quadrant |
| G | Gate | Control input for bidirectional triggering; accepts IGT ≤35 mA pulses in quadrants I, II, and III |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless™ commutation | Guaranteed (dl/dt)c ≥8 A/ms at Tj = 150 °C eliminates need for external snubber networks in motor drive applications |
| High-temperature operation | Rated for continuous operation up to 150 °C junction temperature, enabling compact designs in thermally constrained enclosures |
| Three-quadrant triggering | Supports gate triggering in quadrants I, II, and III - reduces gate drive complexity vs. four-quadrant devices |
| Enhanced noise immunity | Static dV/dt ≥2000 V/µs at Tj = 150 °C prevents spurious turn-on from line transients in industrial environments |
| UL-recognized insulation | 2.5 kV RMS isolation certified per UL1557, allowing direct mounting on grounded metal chassis without additional barriers |
Applications
| Home Appliance Motor Control | Smart AC Plug Load Switching |
|---|---|
Use Scenario: Speed and direction control of universal motors in vacuum cleaners and blenders using phase-angle dimming. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by zero-crossing synchronized gate pulses to regulate RMS power delivered to motor windings. Use Value: Snubberless operation avoids snubber losses and component count; 150 °C rating supports sealed enclosure thermal profiles. |
Use Scenario: Remote-controlled on/off switching of resistive and inductive loads (lamps, small heaters) in smart plugs. IC Role / Device Role / Timing Role: Main AC power switch controlled via isolated microcontroller GPIO through optocoupler-driven gate circuit. Use Value: 2.5 kV insulation enables safe PCB layout with minimal creepage; 800 V rating covers global mains voltages with margin. |
| Inrush Current Limiting | Industrial Heater Control |
Use Scenario: Soft-start sequencing for AC/DC rectifier inputs in power supplies to limit capacitor charging surge. IC Role / Device Role / Timing Role: Phase-controlled triac placed before bridge rectifier to ramp up input voltage over multiple half-cycles. Use Value: High (dl/dt)c ensures reliable turn-off during low-conduction-angle startup; TO-220AB insulation simplifies thermal coupling to heatsink. |
Use Scenario: Closed-loop temperature regulation of heating elements in commercial ovens and water heaters. IC Role / Device Role / Timing Role: Power stage switch modulated via PID output to deliver precise average power to resistive heating coils. Use Value: 8 A RMS rating supports >1.8 kW loads at 230 VAC; 150 °C Tj allows sustained operation near hot components. |
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 |
|---|---|---|---|
| BTB16-800CW | 16 A RMS rating, non-insulated TO-220 package, lower dV/dt (1000 V/µs), no UL insulation rating | Suitable for higher-current, non-isolated board-level designs where heatsink grounding is controlled | Select when higher current headroom is needed and isolation is managed externally |
| MAC12A8G | 12 A RMS, TO-220 non-insulated, 800 V rating, but only two-quadrant triggering (I/III), lower (dl/dt)c (5 A/ms) | Limited to simpler gate drive topologies; less robust in highly inductive motor loads | Choose for cost-sensitive, lower-complexity AC switching where full three-quadrant operation is not required |
Compared with BTB16-800CW and MAC12A8G, the T835H-8I uniquely combines 2.5 kV insulation, three-quadrant triggering, and guaranteed high-temperature commutation margins - making it the preferred choice for safety-critical, space-constrained, and thermally aggressive appliance designs.
Availability
T835H-8I is available at Aetrix Electronics and suitable for home appliance motor control, smart AC plug design, and industrial heater regulation requiring stable component supply and long-term lifecycle support.
Supply support for T835H-8I 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 T835H-8I belongs to ST's Snubberless™ Triac family, engineered specifically for reliable, snubber-free AC power control in thermally demanding home and industrial appliances.
FAQ
What is the maximum allowable case temperature for continuous 8 A operation?
The T835H-8I sustains 8 A RMS current continuously at Tc = 130 °C, as defined in its absolute maximum ratings. Operation above this case temperature requires derating per Figure 2 in DS13573; exceeding 130 °C risks thermal runaway even if junction temperature remains below 150 °C due to Rth(j-c) limits.
Does the T835H-8I require a heat sink in all applications?
Yes - the Rth(j-a) of 60 °C/W (typical) is insufficient for 8 A operation in still air; a heatsink with Rth(c-a) ≤15 °C/W is recommended per Figure 6 to maintain Tj ≤150 °C at full load. The insulated package allows direct mounting to grounded metal chassis without insulating washers.
Can the T835H-8I be triggered using a microcontroller GPIO directly?
No - the 35 mA max IGT and 1.3 V max VGT require active gate drive. A microcontroller must use a discrete transistor or optocoupler (e.g., MOC3021) to source sufficient gate current; direct GPIO connection risks insufficient triggering and erratic conduction.
Is the T835H-8I compliant with RoHS and REACH regulations?
Yes - the device carries ECOPACK2 compliance, confirming adherence to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including halogen-free molding compound and lead-free terminations as verified in ST's official product documentation.
T835H-8I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- H Series
- 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):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 80A, 84A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AB Insulated
T835H-8I FAQ
1.How can I place an order for T835H-8I through Aetrix?
Please submit a Request for Quotation (RFQ) for T835H-8I 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 T835H-8I reliable?
The price and inventory of T835H-8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835H-8I is usually 5 days.
3.What payment methods are accepted for T835H-8I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835H-8I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T835H-8I?
T835H-8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T835H-8I 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 T835H-8I?
For technical support, including T835H-8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835H-8I requirements.
6.How does Aetrix verify that T835H-8I is sourced from the original manufacturer or authorized distributors?
All T835H-8I 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 T835H-8I meets industry standards.
7.What is the process for return or replacement of T835H-8I?
All T835H-8I units undergo pre-shipment inspection (PSI). If there is an issue with T835H-8I, 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 T835H-8I part is unused and in its original packaging.
Return procedure for T835H-8I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T835H-8I Tags
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