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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T835-600B

Name: T835-600B
Brand: STMicroelectronics
SKU: T835-600B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T835-600B

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T835-600B.pdf

Description:: TRIAC ALTERNISTOR 600V 8A DPAK

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Product details

Overview

T835-600B from STMicroelectronics is a snubberless 8 A, 600 V triac in IPAK package, designed for AC phase control and switching in inductive loads. It features 35 mA maximum gate trigger current (IGT), 400 V/µs critical dV/dt at 125 °C, and 5.4 A/ms commutation capability without snubber. Used in motor speed controllers and heating regulation circuits where high commutation robustness is required.

For engineers reviewing the T835-600B datasheet, T835-600B pinout, T835-600B application, or T835-600B equivalent, key selection criteria include snubberless operation on inductive loads, logic-level compatibility with microcontrollers, thermal resistance of 1.6 °C/W (junction-to-case), and IPAK package suitability for medium-power PCB mounting.

Technical Context

This triac operates in three quadrants (I, II, III) with snubberless commutation performance optimized for inductive loads. Its gate sensitivity (IGT ≤ 35 mA) enables direct drive from low-power MCUs without external amplification.

It delivers 8 A RMS on-state current at Tc = 110 °C, supports non-repetitive surge up to 84 A (60 Hz), and maintains stable latching (IL ≤ 50 mA) and holding (IH ≤ 35 mA) currents across –40 to +125 °C junction temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	8 A - Sustains continuous AC load current up to 8 A at case temperature 110 °C
VDRM / VRRM	600 V - Blocks 600 V peak off-state voltage in both directions, suitable for 230 VAC mains
IGT (max)	35 mA - Gate trigger current threshold enabling direct MCU GPIO interface
dV/dt (min)	400 V/µs - Critical rate-of-rise immunity without snubber at 125 °C junction temperature
(dl/dt)c (min)	5.4 A/ms - Minimum commutation di/dt capability ensuring reliable turn-off on inductive loads
Rth(j-c)	1.6 °C/W - Junction-to-case thermal resistance enabling efficient heatsinking in IPAK package
VTM (max)	1.55 V - On-state voltage drop at 11 A pulse, defining conduction loss at rated current

Pinout & Package

IPAK package (JEDEC TO-252 variant) with isolated tab rated per UL standards; thermally enhanced for surface-mount PCB applications requiring moderate power dissipation and mechanical robustness.

Pin/Terminal	Circuit Role	Design Meaning
A1	Main Terminal 1	Reference terminal for gate triggering; connected to load return path in standard phase-control topology
A2	Main Terminal 2	High-side AC line connection; carries full load current and defines voltage polarity reference for gate
G	Gate	Control input accepting ≤35 mA DC pulse to initiate conduction in quadrants I, II, and III

Key Features

Feature	Design Value
Snubberless operation	Enables direct use on inductive loads (e.g., motors, solenoids) without external RC snubber networks
Logic-level gate drive	35 mA max IGT allows direct interfacing with 3.3 V/5 V microcontroller outputs without buffer stages
High commutation robustness	5.4 A/ms (dl/dt)c ensures reliable turn-off under high-inductance conditions at 125 °C
UL-certified insulated tab	2500 VRMS isolation rating meets safety requirements for industrial AC control interfaces

Applications

Motor Speed Control

Heating Regulation

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

IC Role / Device Role / Timing Role: Main AC power switch implementing phase-angle control to adjust RMS voltage delivered to motor windings.

Use Value: Snubberless design eliminates need for external snubbers, reducing BOM count and board space while maintaining reliability under motor back-EMF transients.

Use Scenario: Precise temperature management in electric ovens, soldering irons, and HVAC duct heaters.

IC Role / Device Role / Timing Role: Zero-crossing or phase-controlled AC switch regulating average power to resistive heating elements.

Use Value: 8 A RMS rating supports up to ~1.8 kW at 230 VAC; low IGT enables integration with low-power thermostat controllers.

Static Relay Replacement

Light Dimmer Systems

Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules and industrial control panels.

IC Role / Device Role / Timing Role: Bidirectional AC switch providing contactless ON/OFF control with no moving parts or arcing.

Use Value: 600 V blocking voltage accommodates 230 VAC systems with margin; IPAK package supports automated assembly and thermal management.

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

IC Role / Device Role / Timing Role: Phase-controlled AC switch adjusting conduction angle per half-cycle to modulate light intensity.

Use Value: 400 V/µs dV/dt immunity prevents false triggering from line noise; 35 mA IGT simplifies timing circuit design with standard optocouplers.

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
T835-600G	D²PAK package (Rth(j-c) = 1.6 °C/W same, but larger footprint and higher thermal mass)	Better suited for higher ambient temperatures or forced-air cooling due to improved heat spreading	Select when board layout allows D²PAK and thermal derating margins require extra case-to-ambient margin
BTA08-600BW	TO-220AB insulated package (Rth(j-c) = 2.5 °C/W), 50 mA IGT, same 600 V/8 A rating	Higher gate drive requirement limits direct MCU interface; requires gate driver or resistor network	Choose when mechanical mounting to heatsink is mandatory and isolation voltage >2500 VRMS is needed

Compared with T835-600B, T835-600G offers greater thermal inertia in D²PAK but occupies more PCB area, while BTA08-600BW provides higher isolation voltage in TO-220AB but demands stronger gate drive-making T835-600B optimal for compact, MCU-driven inductive load control.

Availability

T835-600B is available at Aetrix Electronics and suitable for motor speed control, heating regulation, static relay replacement, and light dimmer systems requiring stable component supply and long-term industrial availability.

Supply support for T835-600B 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 markets.

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

FAQ

Is T835-600B compatible with zero-crossing trigger circuits?

No-T835-600B is a standard snubberless triac optimized for phase-angle control, not zero-crossing operation. Its gate trigger characteristics (IGT ≤ 35 mA, VGT ≤ 1.2 V) are specified for quadrant I/II/III firing, and it lacks integrated zero-crossing detection. For zero-crossing applications, ST's Z01xxMN series or dedicated opto-triac drivers should be used instead.

What is the maximum allowable junction temperature during continuous operation?

The maximum operating junction temperature (Tj) for T835-600B is +125 °C, as defined in Table 1. To sustain 8 A RMS current, the case temperature must be held at ≤110 °C per the derating curve in Figure 2. Exceeding 125 °C risks irreversible degradation of the silicon die and bond wires.

Does T835-600B require a heatsink in typical 8 A applications?

Yes-when operating continuously at 8 A RMS, the IPAK package's Rth(j-c) of 1.6 °C/W results in ~12.5 °C junction-to-case rise above ambient. With typical conduction losses (~1.2 W at 8 A), a heatsink maintaining Tc ≤ 110 °C is required. Without heatsinking, sustained 8 A operation exceeds safe thermal limits within seconds.

Can T835-600B replace BTA08-600B in existing designs?

Only with layout and drive circuit review: both share 600 V/8 A ratings, but T835-600B uses IPAK (surface-mount) vs. BTA08-600B's TO-220AB (through-hole), and IGT differs (35 mA vs. 50 mA). Gate drive strength and PCB thermal relief must be verified; mechanical mounting and thermal path differ significantly.

T835-600B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

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

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):: 80A, 84A

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

Current - Hold (Ih) (Max):: 35 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

T835-600B FAQ

1.How can I place an order for T835-600B through Aetrix?

Please submit a Request for Quotation (RFQ) for T835-600B 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 T835-600B reliable?

The price and inventory of T835-600B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835-600B is usually 5 days.

3.What payment methods are accepted for T835-600B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835-600B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T835-600B?

T835-600B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T835-600B 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 T835-600B?

For technical support, including T835-600B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835-600B requirements.

6.How does Aetrix verify that T835-600B is sourced from the original manufacturer or authorized distributors?

All T835-600B 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 T835-600B meets industry standards.

7.What is the process for return or replacement of T835-600B?

All T835-600B units undergo pre-shipment inspection (PSI). If there is an issue with T835-600B, 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 T835-600B part is unused and in its original packaging.

Return procedure for T835-600B:

1.Submit a request within 90 days.

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

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