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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1635H-8I

Name: T1635H-8I
Brand: STMicroelectronics
SKU: T1635H-8I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T1635H-8I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T1635H-8I.pdf

Description:: TRIAC 800V 16A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,511

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Product details

Overview

T1635H-8I from STMicroelectronics is a 16 A, 800 V insulated triac in TO-220AB package, designed for AC line switching in high-temperature environments up to 150 °C junction temperature. It features three-quadrant triggering, 2.5 kV RMS insulation rating, and Snubberless™ technology enabling robust commutation (≥16 A/ms) and high static dV/dt immunity (≥2000 V/µs) without external snubbers - ideal for motor and heater control in home appliances.

For engineers reviewing the T1635H-8I datasheet, T1635H-8I pinout, T1635H-8I application, or T1635H-8I equivalent, key selection criteria include its 16 A RMS current rating, 800 V blocking voltage, 35 mA gate trigger current, 2.0 °C/W junction-to-case thermal resistance, and UL1557-certified 2.5 kV insulation - all critical for thermally constrained AC load control designs.

Technical Context

This triac implements ST's high-temperature Snubberless™ architecture, delivering specified commutation robustness (dl/dt)_c ≥16 A/ms and static dV/dt ≥2000 V/µs at T_j = 150 °C - eliminating need for snubber networks in demanding inductive loads. Its internal ceramic insulation pad ensures 2.5 kV RMS isolation between case and main terminals.

The device operates across full quadrants I, II, and III with gate trigger current I_GT ≤35 mA and holding current I_H ≤35 mA at max junction temperature, supporting reliable turn-on/turn-off in universal motor and resistive heating applications under wide ambient and thermal transients.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	16 A - continuous RMS load current capability at T_c = 115 °C, enabling compact heatsink design
VDRM/VRRM	800 V - symmetrical peak off-state blocking voltage, suitable for 230 VAC mains with safety margin
T_j max.	150 °C - extended junction temperature rating allows operation in sealed enclosures or high-ambient environments
R_th(j-c)	2.0 °C/W - low thermal resistance enables efficient heat transfer to heatsink without derating penalties
V_INS	2.5 kV RMS - UL1557-recognized insulation withstand voltage for reinforced isolation in Class I appliances
I_GT	35 mA max - gate sensitivity supports direct drive from microcontrollers or optocouplers without amplification
(dl/dt)_c	≥16 A/ms - guaranteed commutation robustness for universal motors and transformer-coupled loads without snubber

Pinout & Package

TO-220AB insulated package with integral ceramic isolation barrier between metal tab (case) and main terminals. Metal tab is electrically isolated and rated for 2.5 kV RMS insulation. Mounting torque: 0.4–0.6 N·m.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate triggering; connected to load return path in standard phase-control circuits
A2 (MT2)	Main Terminal 2	Line-side terminal; carries full load current and defines polarity reference for quadrant-triggering behavior
G	Gate	Control input; triggers conduction when voltage exceeds V_GT (≤1.3 V) with current ≥I_GT (≤35 mA)

Key Features

Feature	Design Value
Snubberless™ commutation	Guaranteed (dl/dt)_c ≥16 A/ms at T_j = 150 °C eliminates snubber components in motor control
High noise immunity	Static dV/dt ≥2000 V/µs at T_j = 150 °C prevents false triggering in EMI-heavy appliance environments
UL-recognized insulation	2.5 kV RMS isolation (UL1557) enables single-insulation barrier compliance in Class I household products
ECOPACK2 compliance	Halogen-free molding compound meeting UL94-V0 flammability and RoHS/REACH environmental requirements

Applications

AC Motor Control

Smart AC Plug

Use Scenario: Speed and direction control of universal motors in vacuum cleaners and power tools using phase-angle dimming.

IC Role / Device Role / Timing Role: Main AC switching element triggered by zero-crossing synchronized gate pulses to regulate RMS voltage delivered to motor windings.

Use Value: High (dl/dt)_c and three-quadrant operation ensure clean commutation during reversal and prevent shoot-through in bidirectional drive.

Use Scenario: Remote on/off switching of 230 VAC outlets in smart home hubs with integrated energy monitoring.

IC Role / Device Role / Timing Role: Isolated AC load switch controlled via optocoupler-driven gate, leveraging built-in 2.5 kV insulation for user safety.

Use Value: UL-recognized insulation eliminates need for additional isolation barriers, reducing BOM count and PCB area.

Water Heater Control

Inrush Limiter

Use Scenario: Duty-cycle regulated heating element control in tankless water heaters requiring precise thermal management.

IC Role / Device Role / Timing Role: High-current AC switch modulated via burst-fire control to maintain setpoint temperature without thermal cycling stress.

Use Value: 150 °C T_j rating and 2.0 °C/W R_th(j-c) allow sustained 16 A operation in confined chassis with minimal heatsinking.

Use Scenario: Inrush current limiting during cold-start of bridge rectifiers feeding large bulk capacitors in power supplies.

IC Role / Device Role / Timing Role: Soft-start switch bypassed after capacitor charging, using gate timing to limit di/dt during initial half-cycle conduction.

Use Value: High I_TSM (168 A @ 16.7 ms) and robust dV/dt immunity prevent false turn-on during rectifier voltage overshoot.

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac-based AC load control applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB16-800CW	Same 16 A/800 V rating but non-insulated TO-220 package; no 2.5 kV isolation; lower dV/dt (1000 V/µs)	Requires external isolation for user-accessible circuits; unsuitable for Class I appliance primary-side switching	Select only where mechanical isolation is provided externally and thermal margin permits higher R_th(j-c)
Q6016LH4	16 A/600 V rating; insulated TO-220; lower blocking voltage limits use to 120 VAC systems	Not rated for 230 VAC mains with safety margin; requires redesign of snubber and voltage clamping network	Acceptable only in North American 120 VAC applications with verified voltage derating and thermal validation

Compared with BTB16-800CW and Q6016LH4, the T1635H-8I uniquely combines 800 V blocking, 2.5 kV insulation, and 150 °C operation - making it the sole choice for compact, safety-certified 230 VAC motor and heater control in space-constrained, thermally aggressive environments.

Availability

T1635H-8I is available at Aetrix Electronics and suitable for home appliance motor control, smart AC outlet switching, and industrial heater regulation requiring stable component supply and long-term lifecycle support.

Supply support for T1635H-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 T1635H-8I belongs to ST's Snubberless™ high-temperature triac product line, engineered specifically for reliable, snubber-free AC load control in thermally demanding home appliance and industrial equipment.

FAQ

What is the maximum allowable case temperature for continuous 16 A operation?

The datasheet specifies IT(RMS) = 16 A at T_c = 115 °C. Operation above this case temperature requires linear derating per Figure 2; at T_c = 125 °C, maximum RMS current drops to ~14.5 A. Thermal design must ensure case temperature remains ≤115 °C under worst-case ambient and airflow conditions.

Can T1635H-8I be used in quadrant IV triggering configurations?

No - the T1635H-8I supports triggering only in quadrants I, II, and III, as confirmed in Table 2 electrical characteristics and the "Three triggering quadrants" feature statement. Quadrant IV (A2 negative, G positive) is not characterized or guaranteed, and attempting it may result in unreliable turn-on or device stress.

Is the 2.5 kV insulation rating tested per UL1557 or IEC 60747-5-2?

Yes - the 2.5 kV RMS insulation withstand voltage is UL recognized per UL1557 (file E81734), which covers solid insulation for discrete semiconductor devices. This certification validates creepage, clearance, and dielectric strength for reinforced insulation in Class I equipment, distinct from IEC 60747-5-2 which applies to optocouplers.

Does the "Snubberless™" designation mean zero external components are needed?

Snubberless™ guarantees robust commutation (dl/dt)_c ≥16 A/ms and high dV/dt immunity, eliminating the *need* for RC snubbers in most inductive loads. However, layout-dependent voltage spikes or fast transients may still require small RC networks for EMI suppression - the designation refers to functional reliability, not absolute component elimination.

T1635H-8I Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ECOPACK®2

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Triac Type:: Standard

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):: 160A, 168A

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

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

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB Insulated

T1635H-8I FAQ

1.How can I place an order for T1635H-8I through Aetrix?

Please submit a Request for Quotation (RFQ) for T1635H-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 T1635H-8I reliable?

The price and inventory of T1635H-8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1635H-8I is usually 5 days.

3.What payment methods are accepted for T1635H-8I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1635H-8I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T1635H-8I?

T1635H-8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T1635H-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 T1635H-8I?

For technical support, including T1635H-8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1635H-8I requirements.

6.How does Aetrix verify that T1635H-8I is sourced from the original manufacturer or authorized distributors?

All T1635H-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 T1635H-8I meets industry standards.

7.What is the process for return or replacement of T1635H-8I?

All T1635H-8I units undergo pre-shipment inspection (PSI). If there is an issue with T1635H-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 T1635H-8I part is unused and in its original packaging.

Return procedure for T1635H-8I:

1.Submit a request within 90 days.

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

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