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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T835T-8G-TR

Name: T835T-8G-TR
Brand: STMicroelectronics
SKU: T835T-8G-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T835T-8G-TR

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: T835T-8G-TR.pdf

Description:: TRIAC ALTERNISTOR 800V 8A D2PAK

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Product details

Overview

T835T-8G-TR from STMicroelectronics is a Snubberless™ D²PAK-packaged triac rated for 8 A RMS on-state current, 800 V repetitive peak off-state voltage (VDRM/VRRM), and 900 V non-repetitive surge voltage (VDSM/VRSM), with 35 mA gate trigger current (IGT) and three-quadrant operation. It enables phase-angle or on/off AC switching in high-commutation-demand applications such as motor control and inrush limiting without requiring external snubber circuits when operating within specified dV/dt and dl/dt limits.

For engineers reviewing the T835T-8G-TR datasheet, T835T-8G-TR pinout, T835T-8G-TR application, or T835T-8G-TR equivalent, key selection criteria include its 100 A/µs critical rate of rise of on-state current (dl/dt), 2000 V/µs static dV/dt immunity at 125 °C, 150 °C maximum junction temperature, 1.9 °C/W junction-to-case thermal resistance, and D²PAK package compatibility with high-power SMD thermal management.

Technical Context

The T835T-8G-TR is a three-quadrant, gate-triggered triac designed for robust AC line switching where high commutation capability is essential. Its architecture supports triggering in Quadrants I, II, and III, enabling reliable turn-on under varying polarity conditions without requiring negative gate drive.

It delivers enhanced thermal margin via extended 150 °C junction operation and achieves snubberless performance by combining high static dV/dt immunity (≥2000 V/µs at 125 °C) with high dynamic commutation robustness (dl/dt)c ≥8 A/ms at 125 °C and ≥4 A/ms at 150 °C, reducing system component count and board space.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	8 A - Maximum continuous RMS load current at Tc = 128 °C, defining steady-state power handling capacity.
VDRM / VRRM	800 V - Repetitive blocking voltage at Tj = 125 °C, ensuring safe operation across standard 230 VAC mains with margin.
IGT	35 mA max - Peak gate trigger current required to initiate conduction, determining driver circuit sizing.
dV/dt (static)	2000 V/µs min at Tj = 125 °C - Immunity to false turn-on from rapid voltage transients, eliminating need for gate snubbers.
(dl/dt)c	8 A/ms min at Tj = 125 °C - Critical rate of decrease of main current before commutation failure, enabling reliable turn-off without snubber.
Rth(j-c)	1.9 °C/W max - Junction-to-case thermal resistance in D²PAK package, enabling direct heatsink mounting for thermal management.
Tj range	−40 to +150 °C - Extended operating junction temperature range, supporting high-ambient industrial and appliance environments.

Pinout & Package

The T835T-8G-TR is housed in a surface-mount D²PAK (TO-263) package with an electrically isolated but thermally conductive tab (A2). The package complies with UL 94 V0 flammability rating and Ecopack®2 environmental standards (RoHS and halogen-free).

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Main terminal 1; referenced as common return path in triac conduction loop; electrically connected to tab in D²PAK variant.
A2	Anode 2	Main terminal 2; high-side AC line connection; tab is internally tied to A2 for low-inductance thermal path to heatsink.
G	Gate	Control input; triggers conduction between A1 and A2 when threshold IGT (≤35 mA) and VGT (≤1.3 V) are met in any of three quadrants.

Key Features

Feature	Design Value
Snubberless™ operation	Validated up to 800 V VDRM and 100 A/µs dl/dt without external RC network, reducing BOM count and layout complexity.
Three-quadrant triggering	Enables gate control in Quadrants I, II, and III, allowing simplified drive circuitry versus four-quadrant triacs.
150 °C maximum junction temperature	Extends thermal headroom for high-temperature environments like enclosed motor drives or heating modules.
D²PAK thermal performance	1.9 °C/W Rth(j-c) enables >6 W power dissipation at ΔT = 128 °C, supporting high-current SMD designs without through-hole mounting.
High dV/dt immunity	2000 V/µs minimum at 125 °C prevents false triggering from EMI or line transients in noisy AC environments.

Applications

Motor Control Circuits

Home Appliances

Use Scenario: Controlling universal motor speed in vacuum cleaners or power tools using phase-angle dimming.

IC Role / Device Role / Timing Role: Main AC power switch regulating RMS voltage delivered to motor windings via gate-controlled conduction angle.

Use Value: Eliminates snubber components while maintaining reliable commutation at full-load currents up to 8 A and ambient temperatures to 105 °C.

Use Scenario: On/off cycling of heating elements in rice cookers or coffee makers.

IC Role / Device Role / Timing Role: Zero-crossing or random-phase switching element managing resistive load power delivery.

Use Value: Leverages 900 V VRSM surge rating to withstand inductive kickback from relay-coil interlocks and line transients during frequent thermal cycling.

Inrush Current Limiting

Overvoltage Crowbar Protection

Use Scenario: Soft-start for transformer-based power supplies in audio amplifiers or test equipment.

IC Role / Device Role / Timing Role: Gradually increasing conduction angle over first few AC cycles to limit peak inrush current.

Use Value: Uses high (dl/dt)c (≥8 A/ms) to sustain controlled turn-off during current zero-crossings without oscillation or latch-up.

Use Scenario: Fast-acting crowbar across DC bus during overvoltage events in UPS or battery chargers.

IC Role / Device Role / Timing Role: Triggered into hard conduction by voltage-sensing circuit to short fault condition and blow fuse.

Use Value: Delivers 63 A non-repetitive surge current (ITSM) within 16.7 ms to ensure fuse coordination and system-level protection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB16-800CW	16 A IT(RMS), TO-220 package, 800 V VDRM, 50 mA IGT, two-quadrant only	Higher current rating but requires heatsink mounting and lacks three-quadrant flexibility	Select when higher RMS current and through-hole assembly are prioritized over SMD footprint and quadrant versatility
T835-800G	Same 8 A/800 V rating, D²PAK, but standard (non-T) grade: lower (dl/dt)c (4 A/ms vs. 8 A/ms) and no enhanced dV/dt	Not suitable for snubberless operation in high-dI/dt environments like motor phase control	Select only for basic on/off switching where commutation stress is minimal and cost is primary constraint

Compared with BTB16-800CW and T835-800G, the T835T-8G-TR uniquely balances SMD integration, three-quadrant control, and high commutation robustness-enabling compact, snubberless AC switching in thermally demanding motor and appliance designs where reliability under transient stress is critical.

Availability

T835T-8G-TR is available at Aetrix Electronics and suitable for motor control circuits, home appliance power stages, and inrush current limiting applications requiring stable component supply, tape-and-reel packaging for automated assembly, and long-term industrial lifecycle support.

Supply support for T835T-8G-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, designing and manufacturing microcontrollers, power devices, analog ICs, and sensors for industrial, automotive, and consumer markets.

The T835T-8G-TR belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-commutation AC power control in space-constrained SMD applications where thermal resilience and transient immunity are critical.

FAQ

Is the T835T-8G-TR compatible with zero-crossing trigger circuits?

Yes, the T835T-8G-TR supports zero-crossing operation due to its three-quadrant gate structure and guaranteed latching current (IL ≤ 70 mA) at 150 °C. However, its optimized design targets random-phase control where high (dl/dt)c and dV/dt immunity prevent commutation failure during mid-cycle turn-off-making it especially valuable in phase-dimming motor and lighting applications.

What is the maximum allowable case temperature for continuous 8 A RMS operation?

The datasheet specifies that 8 A RMS operation is rated at Tc = 128 °C. This means the case (tab) temperature must not exceed 128 °C under continuous load. Achieving this requires proper PCB copper area, thermal vias, and optional external heatsinking per the D²PAK footprint guidelines in DS12531, as junction temperature must remain ≤150 °C.

Does the D²PAK tab require electrical isolation from the heatsink?

No-the D²PAK tab of the T835T-8G-TR is electrically connected to Anode 2 (A2), not insulated. Therefore, if the heatsink is grounded or at a different potential than A2, an electrically isolating pad (e.g., mica or polymer film) must be used. Thermal interface material alone is insufficient for electrical isolation.

Can the T835T-8G-TR replace the T835-800G in existing designs?

Yes, the T835T-8G-TR is a direct drop-in replacement for the T835-800G in terms of pinout, package, and basic ratings (8 A, 800 V). However, the "T" suffix denotes enhanced commutation performance: higher (dl/dt)c (8 vs. 4 A/ms) and improved dV/dt immunity. It can be substituted without layout change-but verify that the application benefits from-or does not over-specify-these upgraded characteristics.

T835T-8G-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

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):: 60A, 63A

Current - Gate Trigger (Igt) (Max):: 35 mA

Current - Hold (Ih) (Max):: 40 mA

Configuration:: Single

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

T835T-8G-TR FAQ

1.How can I place an order for T835T-8G-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for T835T-8G-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 T835T-8G-TR reliable?

The price and inventory of T835T-8G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835T-8G-TR is usually 5 days.

3.What payment methods are accepted for T835T-8G-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835T-8G-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T835T-8G-TR?

T835T-8G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T835T-8G-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 T835T-8G-TR?

For technical support, including T835T-8G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835T-8G-TR requirements.

6.How does Aetrix verify that T835T-8G-TR is sourced from the original manufacturer or authorized distributors?

All T835T-8G-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 T835T-8G-TR meets industry standards.

7.What is the process for return or replacement of T835T-8G-TR?

All T835T-8G-TR units undergo pre-shipment inspection (PSI). If there is an issue with T835T-8G-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 T835T-8G-TR part is unused and in its original packaging.

Return procedure for T835T-8G-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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