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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T820T-6I

Name: T820T-6I
Brand: STMicroelectronics
SKU: T820T-6I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T820T-6I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T820T-6I.pdf

Description:: TRIAC ALTERNISTOR 600V 8A TO220

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Inventory:5,925

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Product details

Overview

T820T-6I from STMicroelectronics is a Snubberless™ logic-level 8 A, 600 V RMS triac in a TO-220AB insulated package, rated for 2500 V_rms isolation, with 20 mA gate trigger current (IGT) in quadrants I–III and 40 mA in quadrant IV, designed for phase-angle or on/off AC line switching in motor control circuits for power tools and small home appliances.

For engineers reviewing the T820T-6I datasheet, T820T-6I pinout, T820T-6I application, or T820T-6I equivalent, this device supports high commutation robustness (dV/dt ≥ 750 V/µs at 125 °C), low thermal resistance (R_th(j-c) = 2.8 °C/W), and snubberless operation in value-sensitive AC load switching designs requiring stable gate drive and thermal performance up to 125 °C junction temperature.

Technical Context

The T820T-6I is a four-quadrant, bidirectional thyristor optimized for snubberless operation in AC mains switching, with gate triggering specified across all quadrants and validated static dV/dt immunity of 750 V/µs at T_j = 125 °C. Its design emphasizes high commutation capability without external snubbers, enabled by low dynamic resistance (60 mΩ) and controlled latching/holding behavior (I_L ≤ 35 mA, I_H ≤ 25 mA).

It features clip-bonded construction for low thermal resistance and RoHS-compliant packaging, supporting insulation-rated mounting in safety-critical AC interfaces. The TO-220AB insulated package provides 2500 V_rms isolation between case and terminals, enabling direct heatsink mounting without additional insulation barriers in Class II appliance designs.

Key Specifications

Parameter	Value and Actual Design Meaning
I_T(RMS)	8 A - Sustained AC load current at T_c = 97 °C, suitable for continuous motor or heater control in compact enclosures.
V_DRM/V_RRM	600 V - Peak repetitive blocking voltage, compatible with 230 V AC mains with margin for transients.
I_GT (QI–QIII)	20 mA - Low gate drive requirement enabling direct interface with microcontrollers or optocouplers without buffer stages.
dV/dt (min)	750 V/µs at 125 °C - High noise immunity against fast-rising line transients, eliminating need for snubber networks.
R_th(j-c)	2.8 °C/W - Efficient heat transfer to heatsink, allowing 8 A operation with modest thermal management.
V_T	1.60 V max at 11.3 A - Low conduction loss, reducing power dissipation and self-heating during on-state operation.
I²t (fusing)	26 A²s - Surge withstand capability for 10 ms pulses, supporting inrush current limiting in lighting and motor start-up.

Pinout & Package

Package: TO-220AB insulated (UL E81734 certified, 2500 V_rms isolation, RoHS-compliant, epoxy UL94 V0).

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate triggering; connected to neutral or low-side AC line in standard configurations.
A2 (MT2)	Main Terminal 2	High-side AC line connection; polarity relative to A1 defines triggering quadrant behavior.
G	Gate	Control input accepting low-current pulse (20 mA typ.) to initiate conduction in any quadrant; referenced to A1.

Key Features

Feature	Design Value
Snubberless™ operation	Validated dV/dt immunity ≥ 750 V/µs at 125 °C enables elimination of RC snubber networks, reducing BOM count and board space.
Logic-level gate drive	20 mA I_GT (QI–QIII) allows direct drive from 3.3 V/5 V MCUs or optocouplers without external amplification.
Insulated TO-220AB package	2500 V_rms isolation rating permits safe mounting on grounded heatsinks in double-insulated appliances.
High commutation robustness	(dI/dt)_c ≥ 5.4 A/ms at 125 °C ensures reliable turn-off under inductive load conditions without false re-triggering.
Low thermal resistance	R_th(j-c) = 2.8 °C/W supports full 8 A RMS current with minimal heatsink requirements in space-constrained designs.

Applications

Power Tool Motor Control

Dimmable LED Lighting

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

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

Use Value: Enables precise speed regulation with low gate drive overhead and no snubber components, improving reliability and reducing EMI.

Use Scenario: Leading-edge dimming of AC-powered LED drivers in residential lighting fixtures.

IC Role / Device Role / Timing Role: Main switching element in TRIAC-dimmable driver front-end, conducting full half-cycles based on phase-cut control signal.

Use Value: Supports compatibility with legacy wall dimmers while maintaining low conduction loss (V_T ≤ 1.6 V) and thermal stability up to 125 °C.

Small Appliance Heating Control

Inrush Current Limiting

Use Scenario: On/off cycling of heating elements in kettles, irons, and coffee makers via microcontroller-driven zero-crossing switching.

IC Role / Device Role / Timing Role: High-reliability AC line switch replacing mechanical relays, rated for >100,000 cycles at 8 A resistive load.

Use Value: Eliminates contact wear and arcing, reduces acoustic noise, and improves long-term consistency in thermal cycling environments.

Use Scenario: Controlled turn-on of large capacitive input stages in SMPS or audio amplifiers to limit peak inrush current.

IC Role / Device Role / Timing Role: Soft-start switch bypassing NTC thermistor after initial charge, triggered with delayed phase angle to limit dI/dt.

Use Value: Prevents fuse blowing and rectifier stress during cold start, leveraging 60 A non-repetitive surge rating and 26 A²s I²t capacity.

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
BTA08-600BWRG	Same 8 A/600 V rating but standard (non-Snubberless) design; dV/dt = 50 V/µs typical; requires external snubber.	Suitable where cost is prioritized over board space and EMI; not recommended for high-noise industrial environments.	Select only if snubber components are acceptable and thermal budget allows higher R_th(j-c) (3.5 °C/W).
BTB08-600SL	Snubberless variant with 25 mA I_GT; lower dV/dt immunity (500 V/µs at 125 °C); same TO-220AB insulated package.	Acceptable for less demanding noise environments; slightly higher gate drive requirement limits MCU compatibility.	Prefer when moderate dV/dt margin suffices and 25 mA gate drive aligns with existing driver circuitry.

Compared with BTA08-600BWRG and BTB08-600SL, the T820T-6I delivers superior noise immunity (750 V/µs), lowest gate drive (20 mA), and best thermal efficiency (2.8 °C/W), making it optimal for compact, high-reliability AC control where snubber elimination and MCU direct drive are critical.

Availability

T820T-6I is available at Aetrix Electronics and suitable for motor control in power tools, dimmable lighting systems, and heating control in small home appliances requiring stable component supply and long-lifecycle support.

Supply support for T820T-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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The T8T series belongs to ST's high-reliability AC power switching product line, engineered specifically for snubberless, cost-optimized, and thermally efficient triac solutions in value-sensitive white goods and power tool applications.

FAQ

What is the maximum junction temperature for continuous operation of the T820T-6I?

The T820T-6I has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at the upper limit requires thermal design ensuring case temperature does not exceed 97 °C at 8 A RMS, per the derating curve in Figure 2 of the datasheet. Exceeding 125 °C risks irreversible degradation of gate sensitivity and holding current stability.

Can the T820T-6I be used with 3.3 V microcontrollers without a gate driver?

Yes - its 20 mA maximum I_GT in quadrants I–III allows direct drive from most 3.3 V GPIOs capable of sourcing ≥25 mA peak current. However, a series current-limiting resistor (e.g., 150 Ω) is required to ensure gate voltage stays below 1.3 V and avoid exceeding PG(AV) = 1 W under repeated triggering.

Is heatsinking mandatory for 8 A RMS operation?

Yes - at 8 A RMS, power dissipation exceeds 10 W (based on V_T ≈ 1.6 V). With R_th(j-c) = 2.8 °C/W, even a modest 20 °C rise above ambient requires a heatsink. Without heatsinking, the device is limited to ~1.5 A RMS in free air (per Figure 3), making thermal management essential for rated current use.

Does the "-6I" suffix indicate RoHS compliance and insulation rating?

Yes - the "-6I" suffix denotes both 600 V blocking voltage (6) and TO-220AB insulated package (I), which carries UL E81734 certification and 2500 V_rms isolation. All T8xxT-6I variants are RoHS-compliant (2002/95/EC), lead-free, and use UL94 V0 epoxy encapsulation per ST's ECOPACK® specifications.

T820T-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):: 20 mA

Current - Hold (Ih) (Max):: 25 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

T820T-6I FAQ

1.How can I place an order for T820T-6I through Aetrix?

Please submit a Request for Quotation (RFQ) for T820T-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 T820T-6I reliable?

The price and inventory of T820T-6I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T820T-6I is usually 5 days.

3.What payment methods are accepted for T820T-6I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T820T-6I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T820T-6I?

T820T-6I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T820T-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 T820T-6I?

For technical support, including T820T-6I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T820T-6I requirements.

6.How does Aetrix verify that T820T-6I is sourced from the original manufacturer or authorized distributors?

All T820T-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 T820T-6I meets industry standards.

7.What is the process for return or replacement of T820T-6I?

All T820T-6I units undergo pre-shipment inspection (PSI). If there is an issue with T820T-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 T820T-6I part is unused and in its original packaging.

Return procedure for T820T-6I:

1.Submit a request within 90 days.

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

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