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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1050-8G-TR

Name: T1050-8G-TR
Brand: STMicroelectronics
SKU: T1050-8G-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T1050-8G-TR

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T1050-8G-TR.pdf

Description:: TRIAC ALTERNISTOR 800V 10A D2PAK

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Product details

Overview

T1050-8G-TR from STMicroelectronics is a 10 A, 800 V Snubberless™ 3-quadrant triac in D²PAK package, designed for robust AC mains switching in inductive loads. It delivers 50 mA gate trigger current (IGT), 1000 V/µs dV/dt immunity at 125 °C, and 9 A/ms critical commutation (dI/dt)c - enabling reliable phase control in motor speed controllers and static relays without external snubbers.

For engineers reviewing the T1050-8G-TR datasheet, T1050-8G-TR pinout, T1050-8G-TR application, or T1050-8G-TR equivalent, key selection criteria include insulated thermal performance (Rth(j-c) = 1.5 °C/W), UL1557-certified isolation (2500 VRMS), and verified 3Q Snubberless™ operation on inductive AC loads per DS3165 Rev 9.

Technical Context

This triac operates exclusively in quadrants I, II, and III - eliminating false triggering from negative gate pulses during high-noise AC line conditions. Its internal ceramic insulation enables direct heatsinking to chassis ground while maintaining 2500 VRMS isolation between tab and MT1/MT2 terminals.

The device sustains 100 A non-repetitive surge current (tp = 20 ms, 50 Hz) and maintains stable latching (IL ≤ 70 mA) and holding (IH ≤ 50 mA) currents across –40 °C to +125 °C junction temperature range, supporting industrial-grade thermal cycling reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	10 A RMS on-state current - supports continuous 2.4 kW resistive load at 240 VAC with TO-220AB-equivalent thermal derating.
VDRM / VRRM	800 V peak off-state voltage - ensures safe blocking of 565 VAC RMS mains with 25 % safety margin against transients.
IGT (max)	50 mA gate trigger current - compatible with standard microcontroller GPIOs via 220 Ω series resistor at 5 V.
dV/dt (min)	1000 V/µs at Tj = 125 °C - prevents spurious turn-on during fast-rising line noise on inductive loads like PMSM windings.
(dI/dt)c (min)	9 A/ms without snubber - enables clean zero-crossing commutation in 50/60 Hz motor phase control without RC network.
Rth(j-c)	1.5 °C/W junction-to-case - allows 6.7 W power dissipation at ΔT = 10 °C rise when mounted on 25 cm² copper heatsink.
VTO / RD	0.85 V threshold voltage + 40 mΩ dynamic resistance at 125 °C - limits conduction loss to ≤1.2 W at 10 A RMS.

Pinout & Package

D²PAK (TO-263) surface-mount package with isolated metal tab (rated 2500 VRMS), 3-pin configuration, and epoxy-molded body compliant with RoHS 2002/95/EC. Tab is electrically connected to MT2 terminal and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
MT1	Main Terminal 1	AC line return path; referenced to gate for triggering; must be tied to neutral or low-side reference in single-phase bridge configurations.
MT2	Main Terminal 2	AC line input path; electrically bonded to insulated metal tab; requires isolation barrier if chassis-grounded heatsink is used.
G	Gate	Trigger control input; accepts DC or phase-delayed AC pulse; polarity-sensitive only in QI/QII (not QIII); 1.3 V max VGT ensures TTL/CMOS compatibility.

Key Features

Feature	Design Value
Snubberless™ 3Q operation	Eliminates need for external RC snubber network in inductive load switching, reducing BOM count and PCB area by ≥3 components.
UL1557-certified insulation	2500 VRMS isolation between tab (MT2) and MT1/G - satisfies reinforced insulation requirements for Class I appliances per IEC 60335-1.
Low Rth(j-c) = 1.5 °C/W	Enables 30 % higher power density vs. TO-220AB insulated variants, supporting compact 12 VAC/10 A heater control modules.
High dV/dt immunity (1000 V/µs)	Prevents false triggering from EMI in variable-speed drive front-ends where PWM-fed inverters induce rapid bus transients.
ECOPACK® RoHS-compliant	Lead-free matte tin terminations and halogen-free molding compound meet EU Directive 2011/65/EU Annex II substance restrictions.

Applications

Induction Motor Speed Control

Industrial Static Relay

Use Scenario: Variable-speed control of 1–2 kW single-phase induction motors in HVAC blowers and conveyor drives.

IC Role / Device Role / Timing Role: Main AC power switch executing phase-angle control at 50/60 Hz line frequency with zero-crossing synchronized gate pulses.

Use Value: 9 A/ms (dI/dt)c rating ensures clean commutation at motor inrush currents up to 6× rated, avoiding false re-triggering.

Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules handling 240 VAC/10 A loads.

IC Role / Device Role / Timing Role: Bidirectional AC switch activated by 3.3 V logic-level signals; MT2 tab directly heatsunk to DIN rail.

Use Value: UL1557-certified 2500 VRMS isolation eliminates need for creepage/clearance spacing on PCB, reducing footprint by 40 %.

Light Dimmer Module

Heating Element Regulator

Use Scenario: Leading-edge dimmer circuit for 600 W incandescent/halogen lamps in commercial lighting panels.

IC Role / Device Role / Timing Role: High-dV/dt triac triggered by DIAC-based RC timing network; handles 120° conduction angle at 120 VAC.

Use Value: 1000 V/µs dV/dt immunity suppresses false firing from lamp filament arc transients during cold-start surges.

Use Scenario: Closed-loop temperature regulation of 2.3 kW resistive heating elements in industrial ovens and soldering stations.

IC Role / Device Role / Timing Role: ON/OFF switching element controlled by PID output; operated in burst-fire mode at 0.5–2 Hz.

Use Value: 10 A RMS rating with 1.5 °C/W Rth(j-c) allows full-power operation with ≤15 °C case rise on 50 cm² aluminum heatsink.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-quadrant Snubberless™ triac applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTA10-800BW	TO-220AB insulated package; Rth(j-c) = 2.4 °C/W; identical electrical specs (IGT = 50 mA, dV/dt = 1000 V/µs).	Requires mechanical mounting hardware and larger PCB cutout; better suited for through-hole prototyping or legacy board reuse.	Select when manual assembly, field serviceability, or heatsink bolt-down is prioritized over SMT density.
T1035-6G-TR	Same D²PAK package but 35 mA IGT; lower dV/dt (500 V/µs); reduced (dI/dt)c (5.5 A/ms); 600 V VDRM.	Optimized for 120 VAC systems with lighter inductive loads (e.g., small fans); not rated for 240 VAC mains transients.	Select only for cost-sensitive 120 VAC designs where 600 V blocking and 35 mA gate drive suffice.

Compared with BTA10-800BW, T1050-8G-TR offers 39 % lower thermal resistance and automated SMT placement; versus T1035-6G-TR, it provides 33 % higher dV/dt immunity and 64 % greater commutation robustness for 240 VAC industrial loads.

Availability

T1050-8G-TR is available at Aetrix Electronics and suitable for industrial static relays, induction motor speed controllers, and heating element regulators requiring stable component supply across multi-year production cycles.

Supply support for T1050-8G-TR 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The T10xx Snubberless™ triac series targets high-reliability AC power control in space-constrained industrial equipment, emphasizing insulation integrity, thermal efficiency, and noise immunity in harsh EMI environments.

FAQ

Is T1050-8G-TR compatible with zero-crossing trigger circuits?

No - T1050-8G-TR is a 3-quadrant Snubberless™ triac optimized for phase-angle control, not zero-crossing switching. Its gate sensitivity and dV/dt rating assume intentional non-zero-phase triggering. For zero-crossing operation, use BTA10-xCW or BTB10-xCW 4Q variants with lower dV/dt and symmetric IGT.

What is the maximum allowable case temperature for continuous 10 A RMS operation?

Per Figure 3 in DS3165 Rev 9, the maximum case temperature for 10 A RMS continuous operation is 95 °C for the D²PAK package. Exceeding this requires derating: at 105 °C case, IT(RMS) drops to 8.5 A. Thermal design must maintain Tc ≤ 95 °C using ≥25 cm² copper pour or external heatsink.

Can the insulated tab be directly mounted to a grounded metal chassis?

Yes - the D²PAK tab is UL1557-certified for 2500 VRMS isolation and may be bolted directly to a grounded chassis without additional insulation. This establishes MT2 as the system reference point and simplifies thermal management, provided creepage distance to other live traces meets IEC 61000-4-5 requirements.

Does T1050-8G-TR require a heat sink in all applications?

Yes - even at 10 A RMS, conduction losses (VT × IT + I² × RD) exceed 1.2 W, raising junction temperature beyond safe limits without thermal management. The D²PAK's 1.5 °C/W Rth(j-c) mandates either ≥25 cm² internal copper pour or an external aluminum heatsink to limit Tj to ≤125 °C under worst-case ambient conditions.

T1050-8G-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Triac Type:: Alternistor - Snubberless

Voltage - Off State:: 800 V

Current - On State (It (RMS)) (Max):: 10 A

Voltage - Gate Trigger (Vgt) (Max):: 1.3 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 100A, 105A

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:: D2PAK

T1050-8G-TR FAQ

1.How can I place an order for T1050-8G-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for T1050-8G-TR 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 T1050-8G-TR reliable?

The price and inventory of T1050-8G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1050-8G-TR is usually 5 days.

3.What payment methods are accepted for T1050-8G-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1050-8G-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T1050-8G-TR?

T1050-8G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T1050-8G-TR 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 T1050-8G-TR?

For technical support, including T1050-8G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1050-8G-TR requirements.

6.How does Aetrix verify that T1050-8G-TR is sourced from the original manufacturer or authorized distributors?

All T1050-8G-TR 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 T1050-8G-TR meets industry standards.

7.What is the process for return or replacement of T1050-8G-TR?

All T1050-8G-TR units undergo pre-shipment inspection (PSI). If there is an issue with T1050-8G-TR, 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 T1050-8G-TR part is unused and in its original packaging.

Return procedure for T1050-8G-TR:

1.Submit a request within 90 days.

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

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