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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1620T-8I

Name: T1620T-8I
Brand: STMicroelectronics
SKU: T1620T-8I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T1620T-8I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T1620T-8I.pdf

Description:: TRIAC ALTERNISTOR 800V 16A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:1,560

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Product details

Overview

T1620T-8I from STMicroelectronics is a snubberless, three-quadrant 16 A triac in a TO-220AB insulated package, rated for 600 V repetitive peak off-state voltage and 20 mA maximum gate trigger current. It delivers 2500 V_rms insulation, supports phase-angle and on/off AC line control, and is UL-certified (E81734) for use in home appliance motor and heater switching.

For engineers reviewing the T1620T-8I datasheet, T1620T-8I pinout, T1620T-8I application, or T1620T-8I equivalent, this device is selected for robust AC load switching where snubber-free operation, high dV/dt immunity (>1000 V/µs at 125 °C), and ceramic-insulated thermal safety are required in cost-sensitive industrial and consumer designs.

Technical Context

The T1620T-8I operates across quadrants I, II, and III with symmetrical triggering characteristics, enabling bidirectional conduction without external polarity management. Its snubberless architecture eliminates need for RC networks when operated within specified dV/dt (≥1000 V/µs) and di/dt (≥6 A/ms) limits at junction temperatures up to 125 °C.

It features a low on-state voltage drop (max 1.55 V at 22.6 A, 25 °C) and dynamic resistance of ≤30 mΩ at 150 °C, supporting efficient power handling in thermally constrained environments. The insulated TO-220AB package provides 2.1 °C/W junction-to-case thermal resistance and meets RoHS 2002/95/EC and UL E81734 standards.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	16 A at Tc = 108 °C - continuous AC load current rating for heatsink-mounted operation
VDRM / VRRM	600 V at Tj = 150 °C - peak blocking voltage under repetitive AC conditions
IGT (max)	20 mA - maximum gate trigger current required for reliable turn-on across all quadrants
dV/dt (min)	1000 V/µs at Tj = 125 °C - minimum rate of voltage rise before false triggering occurs
(di/dt)c (min)	6 A/ms at Tj = 125 °C - minimum commutation di/dt capability for snubberless turn-off
Vins (rms)	2500 V for 1 minute - reinforced insulation barrier between tab and terminals
Rth(j-c)	2.1 °C/W - thermal resistance enabling 16 A RMS operation with modest heatsinking

Pinout & Package

Package: TO-220AB insulated (ceramic isolation, UL E81734 certified, RoHS compliant, 2.3 g unit weight).

Pin/Terminal	Circuit Role	Design Meaning
A1	Main terminal 1 (MT1)	Reference electrode for gate trigger; common return path for bidirectional current flow
A2	Main terminal 2 (MT2)	High-side AC line connection; polarity-reversible conduction path with A1
G	Gate	Low-energy control input; triggers conduction in all three quadrants with ≤20 mA pulse

Key Features

Feature	Design Value
Snubberless operation	Validated for dV/dt ≥1000 V/µs and (di/dt)c ≥6 A/ms - eliminates external R+C network, reducing BOM count and board space
Three-quadrant triggering	Guaranteed turn-on in quadrants I, II, and III - enables simplified gate drive circuitry without polarity detection
2500 V_rms insulation	Ceramic-isolated TO-220AB package - satisfies reinforced insulation requirements for Class I appliances and industrial AC mains interfaces
UL certification	File E81734 - confirms safety compliance for end-equipment listing without additional system-level isolation testing

Applications

Fan Speed Control

Pump Motor Switching

Use Scenario: Variable-speed AC induction fan in HVAC or kitchen hood systems requiring smooth, silent speed regulation.

IC Role / Device Role / Timing Role: Triac-based phase-angle controller modulating RMS voltage delivered to fan winding.

Use Value: Snubberless operation reduces component count and EMI; 20 mA IGT enables direct drive from low-power MCU GPIOs via simple resistor.

Use Scenario: On/off cycling of 120/230 V AC water pump in washing machine or dishwasher.

IC Role / Device Role / Timing Role: Zero-crossing–triggered switch managing full-cycle AC power delivery to pump motor.

Use Value: 16 A IT(RMS) rating supports peak inrush currents; 2500 V_rms insulation isolates control logic from mains potential.

Solenoid Actuator Control

Heater Power Regulation

Use Scenario: 230 V AC solenoid valve actuation in boiler controls or irrigation systems.

IC Role / Device Role / Timing Role: High-reliability on/off switch delivering full AC voltage to solenoid coil during activation.

Use Value: 120 A non-repetitive surge rating handles solenoid inrush; UL E81734 certification simplifies safety approval.

Use Scenario: Power modulation for resistive heating elements in electric ovens or water heaters.

IC Role / Device Role / Timing Role: Phase-controlled triac regulating average power to heater while maintaining zero-crossing synchronization.

Use Value: Low V_TM (≤1.55 V) minimizes conduction losses at 16 A; TO-220AB insulation prevents leakage paths in humid environments.

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
BTA16-600BWRG	600 V VDRM, 16 A IT(RMS), but only two-quadrant (QI/QIII); no snubberless rating specified	Lacks guaranteed QII operation and dV/dt immunity - requires external snubber in noisy environments	Select when cost is critical and QII operation not needed; verify snubber design per layout
MAC16A8G	Same 16 A/600 V rating, TO-220AB insulated, but 35 mA IGT (vs. 20 mA) and lower dV/dt immunity (500 V/µs @ 150 °C)	Higher gate drive requirement and reduced noise margin - may need buffer stage with MCUs	Prefer when sourcing legacy inventory; confirm gate driver strength and layout EMI margins

Compared with BTA16-600BWRG and MAC16A8G, the T1620T-8I offers verified three-quadrant snubberless operation with superior dV/dt immunity and lower gate drive demand - making it optimal for compact, low-component-count AC control in safety-certified appliances.

Availability

T1620T-8I is available at Aetrix Electronics and suitable for home appliance motor control, industrial heater regulation, and AC solenoid actuation requiring stable component supply and long-term manufacturing continuity.

Supply support for T1620T-8I 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 T1620T-8I belongs to ST's Snubberless™ triac product line, engineered specifically for reliable, low-BOM AC load switching in cost-sensitive, safety-critical white goods and industrial equipment.

FAQ

What is the maximum junction temperature for continuous operation?

The T1620T-8I supports continuous operation up to +150 °C junction temperature, with derated IT(RMS) of 12 A at Tc = 119 °C. Thermal design must maintain Rth(j-c) ≤2.1 °C/W using an appropriate heatsink, and avoid exceeding 260 °C lead temperature during soldering.

Can this triac be driven directly from a microcontroller GPIO?

Yes - with a series current-limiting resistor, the T1620T-8I can be driven directly by most 3.3 V or 5 V MCUs. At 20 mA max IGT and 1.3 V max VGT, a 220 Ω resistor suffices for 5 V GPIOs; ensure gate pulse width exceeds 2 µs tGT and avoids exceeding 1 W average gate power dissipation.

Is the TO-220AB insulated package compatible with standard TO-220 heatsinks?

Yes - the TO-220AB insulated package uses the same mechanical footprint and mounting hole as standard TO-220AB, but includes internal ceramic insulation. No insulating washer is required; however, mechanical torque must be limited to 0.4–0.6 N·m to avoid cracking the ceramic layer and compromising 2500 V_rms isolation.

Does "Snubberless" mean no external components are ever needed?

No - "snubberless" means the device meets defined dV/dt and di/dt thresholds (≥1000 V/µs and ≥6 A/ms) under specified conditions, allowing omission of RC snubbers in well-designed layouts. Layout parasitics, inductive loads, or fast-switching transients may still require localized damping; always validate per final PCB and load profile.

T1620T-8I 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:: 800 V

Current - On State (It (RMS)) (Max):: 16 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 120A, 126A

Current - Gate Trigger (Igt) (Max):: 20 mA

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

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

T1620T-8I FAQ

1.How can I place an order for T1620T-8I through Aetrix?

Please submit a Request for Quotation (RFQ) for T1620T-8I 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 T1620T-8I reliable?

The price and inventory of T1620T-8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1620T-8I is usually 5 days.

3.What payment methods are accepted for T1620T-8I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1620T-8I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T1620T-8I?

T1620T-8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T1620T-8I 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 T1620T-8I?

For technical support, including T1620T-8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1620T-8I requirements.

6.How does Aetrix verify that T1620T-8I is sourced from the original manufacturer or authorized distributors?

All T1620T-8I 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 T1620T-8I meets industry standards.

7.What is the process for return or replacement of T1620T-8I?

All T1620T-8I units undergo pre-shipment inspection (PSI). If there is an issue with T1620T-8I, 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 T1620T-8I part is unused and in its original packaging.

Return procedure for T1620T-8I:

1.Submit a request within 90 days.

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

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