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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T835T-8G

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

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Part No.:: T835T-8G

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T835T-8G.pdf

Description:: TRIAC ALTERNISTOR 800V 8A D2PAK

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Product details

Overview

T835T-8G 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), designed for phase-angle and on/off AC line switching in motor control, heating, and lighting circuits with high commutation demands.

For engineers reviewing the T835T-8G datasheet, T835T-8G pinout, T835T-8G application, or T835T-8G equivalent, key selection criteria include static dV/dt immunity (≥1000 V/µs at 150 °C), critical turn-off di/dt (≥4 A/ms at 150 °C), three-quadrant triggering, 150 °C maximum junction temperature, and snubberless operation under defined voltage/current slew limits.

Technical Context

The T835T-8G is a three-quadrant, gate-triggered bidirectional thyristor optimized for high-temperature, high-commutation AC switching. Its design supports reliable turn-on in Quadrants I, II, and III with gate trigger current ≤35 mA and gate trigger voltage ≤1.3 V at 25 °C, while maintaining ≥0.2 V gate-to-cathode blocking capability up to 150 °C.

It delivers robust dynamic performance: static dV/dt immunity ≥1000 V/µs at Tj = 150 °C and critical turn-off di/dt ≥4 A/ms at same temperature-enabling snubberless operation in inductive loads like motors and transformers when voltage and current transients remain within specified limits.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	8 A - Maximum continuous AC load current at Tc = 128 °C, defining thermal derating envelope for PCB-mounted designs.
VDRM / VRRM	800 V at Tj = 125 °C - Peak repetitive blocking voltage across main terminals, enabling use in 230 VAC mains with safety margin.
VDSM / VRSM	900 V - Non-repetitive surge withstand capability, supporting transient overvoltage protection in crowbar applications.
IGT	≤35 mA - Maximum gate trigger current required for reliable turn-on in all three quadrants, simplifying driver design.
dV/dt (static)	≥1000 V/µs at Tj = 150 °C - Immunity to false triggering from rapid voltage transients, critical in noisy industrial environments.
(dl/dt)c	≥4 A/ms at Tj = 150 °C - Minimum rate of current decrease during turn-off without commutation failure, enabling snubberless inductive load control.
Rth(j-c)	≤1.9 °C/W - Junction-to-case thermal resistance in D²PAK package, supporting high-power dissipation with minimal heatsink requirement.

Pinout & Package

The T835T-8G is housed in a surface-mount D²PAK (TO-263) package with an electrically insulated tab (non-insulated per datasheet note), UL 94 V0 flammability rating, and Ecopack®2 compliance (RoHS + halogen-free).

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Main terminal 1; referenced as cathode in Quadrant III triggering; forms bidirectional conduction path with A2.
A2	Anode 2	Main terminal 2; polarity reference for gate triggering in Quadrants I and II; carries full load current during conduction.
G	Gate	Control input for triggering; enables turn-on in all three quadrants with low-current pulse (≤35 mA); referenced to A1.

Key Features

Feature	Design Value
Snubberless™ operation	Validated for inductive loads without external RC snubber when dV/dt < 20 V/µs and (dl/dt)c > 20 V/µs, reducing BOM count and board space.
Three-quadrant triggering	Enables gate control in Quadrants I, II, and III-eliminating need for reverse-polarity gate drivers in AC phase-control topologies.
150 °C max junction temperature	Extends thermal operating margin beyond standard 125 °C triacs, allowing higher power density and reduced heatsinking in compact enclosures.
High static dV/dt immunity	≥1000 V/µs at 150 °C ensures immunity to EMI-induced false turn-on in motor drives and appliance EMI environments.
D²PAK thermal performance	Rth(j-c) ≤1.9 °C/W enables 8 A RMS operation with modest heatsinking-superior to TO-220 equivalents in SMT thermal management.

Applications

Motor Control

Heating Control

Use Scenario: Phase-angle control of universal motor speed in power tools and vacuum cleaners with variable torque demand.

IC Role / Device Role / Timing Role: Bidirectional AC switch controlling conduction angle of 50/60 Hz mains waveform to regulate average motor power.

Use Value: Three-quadrant triggering eliminates need for polarity-reversal circuitry; snubberless operation reduces component count in cost-sensitive consumer motor drives.

Use Scenario: On/off cycling of resistive heating elements in electric ovens and water heaters using zero-crossing or burst-fire control.

IC Role / Device Role / Timing Role: High-reliability AC line switch handling 8 A RMS load current with surge tolerance up to 63 A for heater cold-start inrush.

Use Value: 900 V VDSM rating provides margin against line surges; 150 °C Tj rating ensures stable operation during sustained high-temp enclosure conditions.

Lighting Dimming

Inrush Limiting

Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential and commercial lighting systems.

IC Role / Device Role / Timing Role: Triac-based phase-cut switch synchronized to AC zero-crossing to adjust RMS voltage delivered to lamp filament.

Use Value: High dV/dt immunity prevents misfiring during fast voltage transitions in dimmer waveforms; low IGT (≤35 mA) eases microcontroller GPIO drive.

Use Scenario: Inrush current limiting for large capacitive inputs in SMPS and LED drivers using soft-start via controlled conduction angle.

IC Role / Device Role / Timing Role: Controlled turn-on device limiting peak charging current into bulk capacitors during AC power-up sequences.

Use Value: Robust (dl/dt)c ≥4 A/ms at 150 °C ensures clean turn-off after inrush pulse; D²PAK package supports repeated thermal cycling without solder fatigue.

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
BTA16-800BWRG	16 A IT(RMS), TO-220 package, 800 V VDRM, two-quadrant gate, no snubberless certification	Higher current rating but requires external snubber for inductive loads; larger footprint and lower thermal efficiency than D²PAK	Select when higher current headroom is needed and through-hole mounting is acceptable; avoid where snubberless operation or SMT assembly is mandatory.
BTB16-800BWRG	16 A IT(RMS), insulated TO-220 package, 800 V VDRM, two-quadrant gate, no snubberless certification	Includes isolated tab for direct heatsink mounting but lacks three-quadrant triggering and high-temperature dV/dt specs	Prefer for isolated mounting in high-voltage isolation schemes; not suitable for snubberless or high-EMI motor control where T835T-8G's dV/dt and (dl/dt)c are critical.

Compared with BTA16-800BWRG and BTB16-800BWRG, the T835T-8G trades higher current rating for superior SMT integration, verified snubberless operation, three-quadrant control, and guaranteed dV/dt/(dl/dt)c performance at 150 °C-making it optimal for compact, thermally constrained, and EMI-prone AC switching designs.

Availability

T835T-8G is available at Aetrix Electronics and suitable for motor control, heating, and lighting applications requiring stable component supply, long-term manufacturability, and RoHS-compliant SMT packaging.

Supply support for T835T-8G 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, analog ICs, microcontrollers, and automotive-grade components.

The T835T-8G belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, snubber-free AC power control in cost-sensitive, thermally demanding consumer and industrial equipment.

FAQ

Is the T835T-8G truly snubberless, and under what conditions?

Yes-the T835T-8G is certified Snubberless™ per ST's characterization. It operates reliably without an external RC snubber when the applied dV/dt remains below 20 V/µs and the critical turn-off di/dt exceeds 20 V/µs. These limits are validated across its full 150 °C junction temperature range and apply to inductive loads such as motors and transformers.

What does "three-quadrant" triggering mean for this triac?

Three-quadrant triggering means the T835T-8G can be turned on with gate pulses applied between G and A1 in Quadrants I (A2+, G+), II (A2−, G+), and III (A2−, G−). This eliminates the need for polarity-reversal circuitry in AC phase-control designs, simplifying driver design and improving reliability versus two-quadrant alternatives.

Can the T835T-8G replace older triacs like the T835-800 in existing designs?

Yes-with caveats. The T835T-8G offers identical voltage/current ratings and improved thermal capability (150 °C vs. 125 °C), but uses a D²PAK package instead of TO-220. PCB layout and thermal pad design must be updated; gate drive requirements are similar (IGT ≤35 mA), but snubberless operation may allow removal of existing RC networks if dV/dt constraints are met.

Does the D²PAK package have an electrically insulated tab?

No-the D²PAK package used in the T835T-8G has a non-insulated tab, meaning the drain (A2) is electrically connected to the exposed metal pad. This requires careful PCB isolation design: the thermal pad must be routed to A2 potential or fully insulated with dielectric material if mounted to a common heatsink shared with other circuits.

T835T-8G Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

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

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):: 60A, 63A

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

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

Configuration:: Single

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

T835T-8G FAQ

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

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

The price and inventory of T835T-8G 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 is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your T835T-8G 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?

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

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

All T835T-8G 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 meets industry standards.

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

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

Return procedure for T835T-8G:

1.Submit a request within 90 days.

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

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