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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T835-800B

Name: T835-800B
Brand: STMicroelectronics
SKU: T835-800B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T835-800B

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: T835-800B.pdf

Description:: TRIAC ALTERNISTOR 800V 8A DPAK

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Product details

Overview

T835-800B from STMicroelectronics is a snubberless 3-quadrant logic-level triac rated for 8 A RMS on-state current and 800 V repetitive peak off-state voltage, designed for direct interfacing with microcontrollers in AC phase-control circuits. It features 35 mA maximum gate trigger current (IGT), 1.2 V maximum gate trigger voltage (VGT), and high commutation robustness for inductive loads such as motor starters and heating regulators.

For engineers reviewing the T835-800B datasheet, T835-800B pinout, T835-800B application, or T835-800B equivalent, this device is selected for snubberless operation on inductive AC loads, requiring verified dV/dt immunity (>400 V/µs at 125 °C), low IGT compatibility with 3.3 V GPIO, and thermal performance validated for IPAK package mounting on FR4 PCBs with ≥1 cm² copper area.

Technical Context

This triac operates in three quadrants (I, II, III) and is optimized for snubberless switching on inductive loads, with guaranteed commutation performance up to 400 V/µs dV/dt and minimum (dl/dt)c of 3.5 A/ms at 125 °C. Its internal ceramic pad ensures electrical isolation between the tab and die, supporting safe mounting on grounded heatsinks.

The device uses a planar passivated silicon structure with gate sensitivity tuned for logic-level drive - IGT ≤35 mA at 12 V with 30 Ω load - and exhibits low on-state voltage (VTM ≤1.55 V at 11 A, 25 °C) and dynamic resistance (RD ≤50 mΩ at 125 °C), enabling efficient power handling without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	8 A RMS - supports continuous AC load current up to 8 A with TC ≤110 °C in IPAK package.
VDRM / VRRM	800 V - blocks 800 V peak reverse/forward voltage, suitable for 230 VAC mains with safety margin.
IGT (max)	35 mA - compatible with 3.3 V/5 V MCU GPIO without buffer stage; verified at 12 V, 30 Ω load.
dV/dt (min)	400 V/µs - enables reliable snubberless operation on inductive loads like motors and solenoids.
Rth(j-c)	1.6 °C/W - junction-to-case thermal resistance allows 8 A operation with modest heatsinking (ΔT = 12.8 °C at 8 W).
VTM	≤1.55 V at 11 A - low conduction loss reduces self-heating and improves system efficiency.
Holding Current (IH)	≤35 mA - ensures stable latching after triggering, even at elevated junction temperatures (125 °C).

Pinout & Package

Package: IPAK (TO-251AA), surface-mount, lead-free, halogen-free epoxy, UL94 V0 compliant. Tab is electrically connected to MT2 (A2) terminal and provides mechanical mounting and thermal path.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate trigger; current flows from A2 to A1 in quadrant I, A1 to A2 in quadrant III.
A2 (MT2)	Main Terminal 2	Connected to tab; serves as common return path and primary heat sink interface; polarity defines quadrant behavior.
G	Gate	Controls turn-on; triggers conduction when IGT ≥35 mA with appropriate polarity relative to A1/A2.

Key Features

Feature	Design Value
Snubberless operation	Validated dV/dt immunity ≥400 V/µs at 125 °C eliminates need for RC snubber networks on inductive loads.
Logic-level gate drive	IGT ≤35 mA at 12 V enables direct connection to 3.3 V/5 V microcontrollers without external drivers.
High commutation robustness	(dl/dt)c ≥3.5 A/ms at 125 °C ensures reliable turn-off under fast current decay in motor and transformer loads.
Isolated tab design	IPAK package integrates insulated mounting surface - no additional insulator required for grounded heatsink mounting.
Thermal efficiency	Rth(j-c) = 1.6 °C/W supports 8 A RMS operation with minimal heatsink size on standard FR4 PCBs.

Applications

Motor Speed Control

Heating Regulation

Use Scenario: Variable-speed control of single-phase induction motors in fans, pumps, and compressors using phase-angle firing.

IC Role / Device Role / Timing Role: Snubberless triac acting as bidirectional AC switch, triggered synchronously with zero-crossing or phase-shifted timing signals.

Use Value: Eliminates snubber components, reduces BOM count and board space, and sustains reliable commutation during motor inrush and back-EMF transients.

Use Scenario: Proportional power delivery to resistive heating elements in ovens, water heaters, and industrial process controls.

IC Role / Device Role / Timing Role: High-reliability AC power switch modulated via phase-cut dimming to regulate average power without PWM filtering.

Use Value: Maintains stable on-state conduction at full 8 A RMS with <1.55 V drop, minimizing thermal drift and improving temperature setpoint accuracy.

Light Dimming

Static Relay Replacement

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

IC Role / Device Role / Timing Role: Logic-level triac triggered by microcontroller-generated phase-delay pulses to control conduction angle per half-cycle.

Use Value: 35 mA IGT ensures compatibility with low-power MCU outputs; 800 V rating accommodates surge-prone 230 VAC distribution lines.

Use Scenario: Solid-state replacement of electromechanical relays in PLC output modules, HVAC controllers, and industrial I/O cards.

IC Role / Device Role / Timing Role: Fail-safe AC switching element providing galvanic isolation (via insulated tab) and >10⁵ cycle lifetime without contact wear.

Use Value: IPAK package enables automated SMT assembly; Rth(j-c) = 1.6 °C/W supports sustained 8 A switching without forced air cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
T835-600H	Same IPAK package and 35 mA IGT, but rated for 600 V VDRM instead of 800 V.	Suitable only for 120 VAC or well-regulated 230 VAC systems with low surge risk.	Select when 600 V rating suffices and cost optimization is prioritized over universal 230 VAC compatibility.
BTA08-800BW	TO-220AB insulated package, same 800 V/8 A rating and 50 mA IGT; higher gate drive requirement.	Requires gate driver buffering for MCU interfaces; better suited for through-hole prototyping or high-voltage isolation needs.	Choose when mechanical mounting flexibility, UL-rated 2500 VRMS tab isolation, or legacy through-hole layout is required.

Compared with T835-600H, T835-800B adds 200 V blocking margin for global 230 VAC deployment; compared with BTA08-800BW, it reduces gate drive burden and enables compact SMT designs while maintaining snubberless inductive load capability.

Availability

T835-800B is available at Aetrix Electronics and suitable for motor speed control, heating regulation, light dimming, and static relay replacement requiring stable component supply across industrial OEM and embedded design cycles.

Supply support for T835-800B 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, and microcontrollers for industrial, automotive, and consumer applications.

The T8 series belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC switching in inductive and resistive loads without external protection circuitry.

FAQ

What is the maximum junction temperature for continuous operation of T835-800B?

The T835-800B has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 8 A RMS requires thermal design ensuring junction temperature remains ≤125 °C - typically achieved with IPAK-mounted heatsinking and ≥1 cm² copper area per the datasheet's Rth(j-a) curves.

Does T835-800B require a snubber circuit when driving an inductive motor load?

No. As a certified snubberless triac, T835-800B is characterized for reliable commutation at dV/dt ≥400 V/µs and (dl/dt)c ≥3.5 A/ms at 125 °C, eliminating the need for external RC snubbers in typical single-phase motor starting and speed control applications.

Can T835-800B be driven directly by a 3.3 V microcontroller GPIO?

Yes. With a maximum gate trigger current (IGT) of 35 mA at 12 V and 30 Ω load, and verified operation down to 5 mA at 5% of max IGT, the T835-800B is compatible with 3.3 V MCUs when used with appropriate series resistance (e.g., 100–220 Ω) to limit peak gate current within safe limits.

What is the thermal resistance from junction to case (Rth(j-c)) for the IPAK package?

The junction-to-case thermal resistance (Rth(j-c)) for T835-800B in IPAK package is 1.6 °C/W, measured under AC conditions. This value enables accurate thermal modeling for heatsink sizing - for example, dissipating 8 W at 8 A yields only a 12.8 °C temperature rise from junction to case.

T835-800B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

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):: 50 mA

Current - Hold (Ih) (Max):: 50 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

T835-800B FAQ

1.How can I place an order for T835-800B through Aetrix?

Please submit a Request for Quotation (RFQ) for T835-800B 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 T835-800B reliable?

The price and inventory of T835-800B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835-800B is usually 5 days.

3.What payment methods are accepted for T835-800B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835-800B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T835-800B?

T835-800B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T835-800B 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 T835-800B?

For technical support, including T835-800B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835-800B requirements.

6.How does Aetrix verify that T835-800B is sourced from the original manufacturer or authorized distributors?

All T835-800B 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 T835-800B meets industry standards.

7.What is the process for return or replacement of T835-800B?

All T835-800B units undergo pre-shipment inspection (PSI). If there is an issue with T835-800B, 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 T835-800B part is unused and in its original packaging.

Return procedure for T835-800B:

1.Submit a request within 90 days.

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

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