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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T2035T-8G

Name: T2035T-8G
Brand: STMicroelectronics
SKU: T2035T-8G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T2035T-8G

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T2035T-8G.pdf

Description:: TRIAC ALTERNISTOR 800V 20A D2PAK

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Product details

Overview

T2035T-8G from STMicroelectronics is a Snubberless™ Triac in D²PAK package, rated for 20 A RMS on-state current and 800 V repetitive peak off-state voltage, with 35 mA gate trigger current and 150 °C maximum junction temperature. It delivers high commutation robustness (dl/dt)_c ≥17.5 A/ms at 150 °C and static dV/dt ≥1000 V/µs at T_j = 150 °C, enabling reliable phase-angle control in AC heating and motor drive circuits without external snubbers.

For engineers reviewing the T2035T-8G datasheet, T2035T-8G pinout, T2035T-8G application, or T2035T-8G equivalent, key selection criteria include verified three-quadrant triggering behavior, non-insulated tab thermal performance (R_th(j-c) = 1.15 °C/W), surge capability up to 168 A (16.7 ms), and Ecopack®2 compliance for industrial-grade thermal and environmental reliability.

Technical Context

This triac operates across all three quadrants (I, II, III) with symmetrical gate trigger characteristics-IGT ≤35 mA and VGT ≤1.0 V at 25 °C-and maintains stable latching (IL ≤80 mA) and holding (IH ≤45 mA) currents over –40 to +150 °C. Its high dynamic commutation margin (dl/dt)_c ≥27.5 A/ms at 125 °C enables robust turn-off under inductive load transients.

The device leverages a non-insulated D²PAK metal tab for low thermal resistance (1.15 °C/W junction-to-case), supporting high-power AC switching up to 20 A RMS at T_c = 122 °C. Blocking performance is specified at 800 V (T_j ≤125 °C) and derated to 600 V at 150 °C, with non-repetitive surge rating of 900 V (V_DSM/V_RSM).

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	20 A - Sustains continuous AC load current up to 20 A RMS at case temperature 122 °C without forced cooling
VDRM/VRRM	800 V @ Tj ≤125 °C - Blocks 800 V AC line peaks in standard 50/60 Hz applications with safety margin
IGT	35 mA max - Low gate drive requirement compatible with microcontroller GPIO or optocoupler outputs
(dl/dt)c	17.5 A/ms @ Tj = 150 °C - Ensures reliable turn-off under high-temperature inductive switching without snubber
dV/dt	1000 V/µs @ Tj = 150 °C - Prevents false triggering during fast transient noise on mains lines
Rth(j-c)	1.15 °C/W - Enables direct heatsinking via non-insulated tab for compact thermal design
VTM	1.50 V max @ 28.2 A - Low conduction loss supports efficient power delivery in heating and lighting loads

Pinout & Package

D²PAK package with non-insulated metal tab (A2) for direct thermal mounting; UL 94 V0 flammability rating and Ecopack®2 compliance (RoHS + halogen-free).

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Main current terminal; referenced as common return path in quadrant I/III operation
A2	Anode 2	Main current terminal + thermal tab; electrically connected to case for low R_th(j-c)
G	Gate	Trigger input; controls bidirectional conduction onset in all three quadrants

Key Features

Feature	Design Value
Snubberless™ operation	Validated commutation robustness eliminates need for RC snubber in most phase-control designs
Three-quadrant triggering	Guaranteed turn-on in quadrants I, II, and III with uniform IGT ≤35 mA and VGT ≤1.0 V
Extended junction temperature	Rated for continuous operation up to 150 °C, increasing thermal headroom in enclosed appliances
High surge immunity	Withstands 168 A non-repetitive surge (16.7 ms) for inrush and fault protection in motor start-up
Ecopack®2 packaging	D²PAK meets RoHS and halogen-free requirements while maintaining UL 94 V0 flammability rating

Applications

AC Motor Speed Control

Resistive Heating Control

Use Scenario: Variable-speed fan or pump drive in HVAC systems using phase-angle dimming.

IC Role / Device Role / Timing Role: Bidirectional AC switch controlling conduction angle per half-cycle to regulate average power.

Use Value: Eliminates snubber components and sustains 20 A RMS at 122 °C case temperature for compact, thermally efficient designs.

Use Scenario: Solid-state relay function in electric ovens or water heaters with zero-crossing or phase-control logic.

IC Role / Device Role / Timing Role: Main power switch modulating 230 V AC resistive load based on thermostat feedback.

Use Value: 150 °C T_j rating and 1.15 °C/W R_th(j-c) enable direct heatsink mounting without isolation pads.

Inrush Current Limiting

Overvoltage Crowbar Protection

Use Scenario: Soft-start circuit for transformer-based power supplies or large capacitor banks.

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

Use Value: High (dl/dt)_c ≥17.5 A/ms ensures clean turn-off after initial ramp, preventing latch-up.

Use Scenario: Fail-safe overvoltage clamp in industrial AC input stages triggered by transient detection.

IC Role / Device Role / Timing Role: Latched crowbar switch shorting line to neutral when overvoltage exceeds threshold.

Use Value: 900 V non-repetitive surge rating (V_DSM/V_RSM) provides margin against lightning-induced transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTA20-800BWRG	Same 20 A/800 V rating but 50 mA IGT; lower (dl/dt)_c (12 A/ms @ 125 °C); insulated TO-220 package	Requires snubber in high-dI/dt loads; higher R_th(j-c) (1.5 °C/W) limits power density	Select when insulation between tab and heatsink is mandatory and snubber space is available
BTB20-800CW	20 A/800 V, 35 mA IGT, but only two-quadrant (QI/QIII); D²PAK package; no (dl/dt)_c spec at 150 °C	Limited to DC-biased or asymmetric AC loads; reduced thermal margin above 125 °C	Select for cost-sensitive, non-critical phase control where full three-quadrant operation is unnecessary

Compared with BTA20-800BWRG and BTB20-800CW, the T2035T-8G uniquely combines three-quadrant triggering, 150 °C operation, and validated snubberless performance-enabling smaller, cooler, and more robust AC control in space-constrained industrial and appliance designs.

Availability

T2035T-8G is available at Aetrix Electronics and suitable for AC motor speed control, resistive heating regulation, and inrush limiting applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for T2035T-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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The T2035T-8G belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-temperature AC power control in space- and thermal-constrained applications such as home appliances and industrial automation.

FAQ

Is the T2035T-8G truly snubberless in all applications?

No-snubberless operation is guaranteed only when operating conditions stay within datasheet-defined limits: dV/dt ≤1000 V/µs at 150 °C, (dl/dt)_c ≤17.5 A/ms, and V_DRM derated to 600 V above 125 °C. Exceeding these requires empirical validation or snubber addition.

Can the D²PAK tab be electrically connected to system ground?

Yes-the A2 terminal is internally bonded to the metal tab, so grounding the tab grounds A2. This must be accounted for in PCB layout and isolation requirements; it is not electrically isolated like TO-220 insulated packages.

What is the minimum gate drive needed for reliable triggering at 150 °C?

At T_j = 150 °C, IGT rises to ~1.8× its 25 °C value (35 mA), requiring ≥63 mA peak gate current. A 12 V/30 Ω drive (400 mA) remains sufficient, but low-current drivers must be re-evaluated per Figure 5 in DS12739.

Does T2035T-8G support zero-crossing switching?

It does not integrate zero-crossing detection; however, its three-quadrant gate structure allows external zero-crossing controllers (e.g., MOC30xx optocouplers) to trigger conduction precisely at voltage zero, minimizing EMI and inrush stress.

T2035T-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):: 20 A

Voltage - Gate Trigger (Vgt) (Max):: 1 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 168A, 160A

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

Current - Hold (Ih) (Max):: 45 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

T2035T-8G FAQ

1.How can I place an order for T2035T-8G through Aetrix?

Please submit a Request for Quotation (RFQ) for T2035T-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 T2035T-8G reliable?

The price and inventory of T2035T-8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T2035T-8G is usually 5 days.

3.What payment methods are accepted for T2035T-8G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T2035T-8G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T2035T-8G?

T2035T-8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T2035T-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 T2035T-8G?

For technical support, including T2035T-8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T2035T-8G requirements.

6.How does Aetrix verify that T2035T-8G is sourced from the original manufacturer or authorized distributors?

All T2035T-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 T2035T-8G meets industry standards.

7.What is the process for return or replacement of T2035T-8G?

All T2035T-8G units undergo pre-shipment inspection (PSI). If there is an issue with T2035T-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 T2035T-8G part is unused and in its original packaging.

Return procedure for T2035T-8G:

1.Submit a request within 90 days.

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

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