Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T835T-6I

Name: T835T-6I
Brand: STMicroelectronics
SKU: T835T-6I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: T835T-6I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T835T-6I.pdf

Description:: TRIAC ALTERNISTOR 600V 8A TO220

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:123

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

T835T-6I from STMicroelectronics is a Snubberless™ logic-level triac rated for 8 A RMS on-state current, 600 V repetitive peak off-state voltage (VDRM/VRRM), and 35 mA maximum gate trigger current (IGT) in Quadrants I–III. It features high dynamic commutation (dV/dt = 2000 V/µs at Tj = 125 °C), low thermal resistance (Rth(j-c) = 2.8 °C/W), and is housed in a TO-220AB insulated package with 2500 V_rms isolation - used in motor control circuits for power tools and inrush-limiting crowbar protection.

For engineers reviewing the T835T-6I datasheet, T835T-6I pinout, T835T-6I application, or T835T-6I equivalent, this part supports phase-angle and zero-crossing AC switching in thermally constrained, value-sensitive appliances where snubberless operation, high dV/dt immunity, and reliable turn-on at low gate drive are critical selection criteria.

Technical Context

The T835T-6I is a three-quadrant (Q1–Q3) logic-level triac optimized for snubberless operation in AC line switching. Its gate trigger sensitivity (IGT ≤ 35 mA) enables direct drive from microcontrollers or optocouplers without external amplification, while its 2000 V/µs dV/dt rating at 125 °C ensures robust false-trigger immunity under fast transient conditions.

Thermally, it leverages clip-bonding to achieve Rth(j-c) = 2.8 °C/W, supporting 8 A RMS conduction at Tc = 97 °C. The TO-220AB insulated package provides reinforced 2500 V_rms isolation, meeting UL E81734 certification and RoHS 2002/95/EC compliance.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	8 A - Sustains full-sine AC load current up to 8 A at case temperature ≤ 97 °C without heatsink derating.
VDRM / VRRM	600 V - Blocks 600 V peak AC line voltage in both directions, suitable for 230 VAC mains with safety margin.
IGT (Q1–Q3)	≤ 35 mA - Guaranteed turn-on with ≤35 mA gate current, enabling direct MCU or opto-triac drive.
dV/dt (Tj = 125 °C)	2000 V/µs - Resists false triggering from fast-rising transients without snubber network.
Rth(j-c)	2.8 °C/W - Enables efficient heat transfer to heatsink; allows 8 A operation with modest thermal design.
Isolation Voltage	2500 V_rms - Reinforced insulation between main terminals and mounting base meets safety standards for Class II appliances.
ITSM (50 Hz)	60 A - Withstands 60 A non-repetitive surge for 20 ms, supporting motor startup and lamp inrush currents.

Pinout & Package

Package: TO-220AB insulated (plastic body with isolated metal tab); UL-certified, RoHS-compliant, ECOPACK® grade.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate trigger; connects to load return or neutral side in AC switch configuration.
A2 (MT2)	Main Terminal 2	High-side AC line connection; carries full load current and defines polarity reference for quadrants.
G	Gate	Control input; triggers conduction when ≥35 mA pulse applied relative to A1 in Q1/Q3; no trigger required in Q4.

Key Features

Feature	Design Value
Snubberless™ operation	Eliminates external RC snubber components by sustaining 2000 V/µs dV/dt without false turn-on.
Logic-level gate drive	Max 35 mA IGT enables direct interface with 3.3 V/5 V MCUs and standard optocouplers (e.g., MOC302x).
High commutation robustness	Supports reliable turn-off under inductive loads (e.g., universal motors) without forced commutation circuitry.
Insulated TO-220AB package	2500 V_rms isolation allows safe mounting on PCB without chassis grounding, reducing creepage/clearance design effort.
Low thermal resistance	Rth(j-c) = 2.8 °C/W enables compact thermal design - 8 A RMS achievable with minimal heatsink surface area.

Applications

Power Tool Motor Control

LED/Lamp Dimming Module

Use Scenario: Variable-speed control of universal motors in corded drills and sanders using phase-angle firing.

IC Role / Device Role / Timing Role: Main AC power switch; triggered synchronously with zero-crossing detection to regulate average power delivered to motor.

Use Value: Snubberless operation eliminates snubber losses and component count; 35 mA IGT allows direct drive from low-power optocoupler (MOC3041), reducing BOM cost.

Use Scenario: Leading-edge dimming of resistive and capacitive LED drivers in residential lighting panels.

IC Role / Device Role / Timing Role: AC line switch implementing phase-cut dimming; gated by microcontroller-based timing logic synchronized to AC zero-crossing.

Use Value: 2000 V/µs dV/dt immunity prevents misfiring during rapid voltage transitions common in leading-edge dimmers with capacitive loads.

Inrush Current Limiter

Overvoltage Crowbar Protection

Use Scenario: Limiting inrush into transformer primary or large capacitor banks during cold start in HVAC control boards.

IC Role / Device Role / Timing Role: Soft-start switch; triggered with controlled delay after power-up to limit peak current surge.

Use Value: 60 A non-repetitive surge rating (ITSM) handles 10× steady-state current for short durations, protecting upstream fuses and rectifiers.

Use Scenario: Fast-acting overvoltage protection in DC power supplies using AC line sensing and thyristor crowbar.

IC Role / Device Role / Timing Role: Crowbar switch; triggered by overvoltage comparator to short AC line and blow fuse during fault.

Use Value: Low latching current (IL ≤ 50 mA) ensures reliable crowbar activation even with weak gate drive, improving system fail-safe response time.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BT139-600E	Standard 4Q triac; IGT = 50 mA; dV/dt = 100 V/µs; no snubberless rating; TO-220 non-insulated.	Requires external snubber; gate drive needs higher current; mounting requires isolation barrier or insulating washer.	Select when cost is primary constraint and snubber components are acceptable; not suitable for space-constrained or ultra-low-BOM designs.
T835-600B	Same Snubberless™ 3Q performance; IGT = 35 mA; but TO-220AB non-insulated (no 2500 V_rms isolation).	Lacks reinforced insulation; cannot be mounted directly to grounded chassis without additional isolation hardware.	Select when board-level isolation is already implemented elsewhere and mechanical mounting flexibility is preferred over integrated isolation.

Compared with BT139-600E and T835-600B, the T835T-6I uniquely combines snubberless operation, logic-level gate drive, and built-in 2500 V_rms isolation - reducing component count, simplifying thermal/mechanical layout, and accelerating safety certification for Class II consumer appliances.

Availability

T835T-6I is available at Aetrix Electronics and suitable for motor control in power tools, LED dimming modules, and inrush current limiting circuits requiring stable component supply across long-lifecycle industrial and consumer programs.

Supply support for T835T-6I 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The T8T series belongs to ST's high-reliability AC power switching portfolio, engineered specifically for cost-sensitive, thermally demanding AC load control in white goods, power tools, and lighting - emphasizing snubberless robustness, gate drive simplicity, and safety-certified packaging.

FAQ

What is the maximum junction temperature for continuous operation of the T835T-6I?

The T835T-6I has an operating junction temperature range of –40 °C to +125 °C. Continuous operation must maintain Tj ≤ 125 °C, enforced via thermal design ensuring case temperature does not exceed 97 °C at 8 A RMS - verified using Rth(j-c) = 2.8 °C/W and ambient/heatsink conditions per Figure 2 in the datasheet.

Can the T835T-6I be used in four-quadrant triggering applications?

No - the T835T-6I is a three-quadrant (Q1, Q2, Q3) triac and is not characterized for reliable gate triggering in Quadrant IV (A2 negative, G positive). For full 4Q operation, ST recommends the T825T-6I (standard 4Q, IGT = 25 mA) or BT139-series devices.

Does the "T" suffix in T835T-6I indicate a specific temperature grade?

No - the "T" in T835T-6I denotes the Snubberless™ triac family and TO-220AB insulated package variant. It is not a temperature grade indicator; all T8T parts share the same –40 °C to +125 °C operating junction range and are qualified per industrial temperature standards.

Is a heatsink mandatory for 8 A RMS operation?

Yes - the 8 A RMS rating is specified at Tc = 97 °C. Without a heatsink, Rth(j-a) = 60 °C/W limits usable current to ~1.3 A in free air. A heatsink maintaining Tc ≤ 97 °C is required; typical designs use aluminum extrusions or stamped plates with thermal interface material to meet the 2.8 °C/W path requirement.

T835T-6I 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:: 600 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:: Through Hole

Supplier Device Package:: TO-220

T835T-6I FAQ

1.How can I place an order for T835T-6I through Aetrix?

Please submit a Request for Quotation (RFQ) for T835T-6I 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-6I reliable?

The price and inventory of T835T-6I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835T-6I is usually 5 days.

3.What payment methods are accepted for T835T-6I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835T-6I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T835T-6I?

T835T-6I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T835T-6I 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-6I?

For technical support, including T835T-6I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835T-6I requirements.

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

All T835T-6I 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-6I meets industry standards.

7.What is the process for return or replacement of T835T-6I?

All T835T-6I units undergo pre-shipment inspection (PSI). If there is an issue with T835T-6I, 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-6I part is unused and in its original packaging.

Return procedure for T835T-6I:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…