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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T3035H-8I

Name: T3035H-8I
Brand: STMicroelectronics
SKU: T3035H-8I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T3035H-8I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T3035H-8I.pdf

Description:: TRIAC ALTERNSTR 800V 30A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:16,523

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Product details

Overview

T3035H-8I from STMicroelectronics is a 30 A, 800 V insulated triac in TO-220AB package, designed for high-noise immunity AC load switching in industrial and home appliance applications. It operates up to 150 °C junction temperature, supports three-quadrant triggering, and delivers 2.5 kV RMS insulation per UL1557. Used in smart AC plugs, water heaters, and universal motor control.

For engineers reviewing the T3035H-8I datasheet, T3035H-8I pinout, T3035H-8I application, or T3035H-8I equivalent, key selection criteria include dV/dt immunity (2000 V/µs at Tj = 150 °C), commutation robustness (25 A/ms), gate trigger current (35 mA max), thermal resistance (1.6 °C/W j-c), and insulated package compliance with ECOPACK2 and UL1557.

Technical Context

This triac implements ST's Snubberless high-temperature technology, enabling reliable turn-off under high di/dt stress without external snubbers. Its internal ceramic insulation ensures 2.5 kV RMS isolation, and its three-quadrant gate triggering supports flexible phase-control drive schemes across AC line polarities.

Designed for thermally demanding environments, it maintains stable latching/holding current behavior up to 150 °C and exhibits minimal degradation in static dV/dt immunity over temperature - retaining >90% of rated 2000 V/µs performance even at Tj = 125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	30 A - Sustains continuous AC load current at Tc = 91 °C without derating beyond thermal limits.
VDRM/VRRM	800 V - Blocks repetitive peak off-state voltage on both polarities, suitable for 230 VAC mains with safety margin.
dV/dt (min)	2000 V/µs at Tj = 150 °C - Resists false triggering from fast-rising transients in noisy industrial environments.
(dl/dt)c (min)	25 A/ms at Tj = 150 °C - Ensures robust commutation during inductive load turn-off without snubber network.
VINS	2.5 kV RMS - Meets UL1557 reinforced insulation requirement for user-accessible AC-connected equipment.
Rth(j-c)	1.6 °C/W - Enables compact heatsink design; 48 W max power dissipation at ΔT = 77 °C (150 °C − 73 °C).
IGT (max)	35 mA - Defines maximum gate drive current needed for reliable turn-on across all quadrants and temperature range.

Pinout & Package

TO-220AB insulated package with integral ceramic barrier between mounting base and leads. Mounting tab (A2) is electrically isolated from pins; case serves as main terminal (A2), not ground reference.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Current return path for bidirectional conduction; referenced to A2 for gate triggering polarity.
A2 (MT2)	Main Terminal 2 / Case	Isolated mounting tab serving as second main terminal; provides 2.5 kV RMS insulation from PCB ground.
G	Gate	Three-quadrant control input; triggers conduction when voltage exceeds VGT (≤1.3 V) with ≥5 mA current.

Key Features

Feature	Design Value
Snubberless commutation	Rated (dl/dt)c ≥25 A/ms at 150 °C - eliminates need for external RC snubber in motor and heater drive circuits.
High-temperature operation	Full 30 A RMS rating maintained up to 150 °C junction temperature - enables compact enclosure designs without forced cooling.
Enhanced noise immunity	Static dV/dt ≥2000 V/µs at Tj = 150 °C - prevents spurious turn-on in EMI-heavy environments like washing machines or HVAC systems.
UL1557-certified insulation	2.5 kV RMS isolation - satisfies reinforced insulation requirements for Class I appliances with accessible metal parts.
ECOPACK2 compliance	Halogen-free epoxy, lead-free terminations - meets RoHS and REACH requirements for global market access.

Applications

Smart AC Plug Control

Water Heater Power Stage

Use Scenario: Solid-state replacement for mechanical relays in Wi-Fi-enabled smart plugs controlling resistive loads up to 6.9 kW (230 VAC).

IC Role / Device Role / Timing Role: Bidirectional AC switch triggered via zero-crossing optocoupler and microcontroller GPIO.

Use Value: Eliminates contact wear and audible click; enables precise phase-angle dimming and energy monitoring via current sensing on A1/A2 path.

Use Scenario: On/off and power modulation in tank-type electric water heaters with 3–5 kW heating elements.

IC Role / Device Role / Timing Role: High-current AC line switch controlled by thermostat or PID loop output through discrete gate driver.

Use Value: Supports rapid thermal cycling without degradation; withstands inrush currents up to 283 A (16.7 ms) during cold-element startup.

Universal Motor Speed Control

Inrush Limiter for Bridge Rectifiers

Use Scenario: Variable-speed control of brushed universal motors in vacuum cleaners, power tools, and blenders.

IC Role / Device Role / Timing Role: Phase-controlled triac switch synchronized to AC zero-crossing, driven by analog or PWM-modulated gate signal.

Use Value: Maintains torque at low speeds due to high (dl/dt)c rating; avoids commutation failure during abrupt load changes.

Use Scenario: Inrush current limiting in AC/DC power supplies using bridge rectifiers and bulk capacitors (e.g., 100–470 µF).

IC Role / Device Role / Timing Role: Pre-charge switch bypassed after capacitor charging completes; placed in series with NTC or fixed resistor.

Use Value: Limits peak inrush to <30 A with 283 A surge capability; reduces thermal stress on upstream fuses and rectifier diodes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB32-800BW	Same 32 A/800 V rating but non-insulated TO-220AB; Rth(j-c) = 1.5 °C/W; no UL1557 certification.	Requires external isolation barrier for user-accessible designs; unsuitable for Class I appliances without additional creepage/clearance measures.	Select when cost-sensitive industrial controls allow non-isolated mounting and PCB-level isolation is implemented separately.
Q6035LH4	35 A/600 V; insulated TO-220; dV/dt = 1000 V/µs (Tj = 125 °C); lower voltage rating limits 230 VAC surge margin.	Better suited for 120 VAC systems or lower-voltage industrial lines; insufficient blocking margin for 230 VAC + 20% tolerance.	Choose only for 120 VAC applications where higher current headroom justifies reduced voltage safety margin.

Compared with BTB32-800BW and Q6035LH4, the T3035H-8I uniquely combines UL1557-rated insulation, 800 V blocking, and 2000 V/µs dV/dt at 150 °C - making it the only option qualified for compact, safety-critical 230 VAC smart appliances without external isolation components.

Availability

T3035H-8I is available at Aetrix Electronics and suitable for smart AC plug control, water heater power stages, and universal motor speed regulation requiring stable component supply and long-term industrial availability.

Supply support for T3035H-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, delivering innovative solutions across automotive, industrial, power, and embedded markets since 1987.

The T3035H-8I belongs to ST's Snubberless Triac family, engineered specifically for high-reliability AC power control in thermally constrained, safety-critical home and industrial appliances.

FAQ

What is the maximum allowable case temperature for continuous 30 A RMS operation?

The T3035H-8I sustains 30 A RMS current continuously at case temperature (Tc) ≤91 °C, as specified in absolute maximum ratings. Exceeding this requires derating per Figure 2 in DS12682; at Tc = 100 °C, IT(RMS) drops to ~27 A.

Does the insulated TO-220AB package require thermal compound when mounted to a heatsink?

Yes - thermal interface material is required between the isolated metal tab (A2) and heatsink to ensure effective heat transfer. The ceramic insulation does not impede conduction; Rth(j-c) = 1.6 °C/W assumes standard thermal paste and 0.4–0.6 N·m mounting torque.

Can the T3035H-8I be triggered in quadrant IV (A2+, G−)?

No - the device supports triggering only in quadrants I (A2+, G+), II (A2−, G+), and III (A2−, G−). Quadrant IV triggering is not characterized or guaranteed per datasheet Table 2 and functional description.

What is the minimum gate trigger voltage (VGT) at 150 °C junction temperature?

VGT is not specified at 150 °C in the datasheet; maximum VGT = 1.3 V is guaranteed at Tj = 25 °C. Per Figure 7, typical VGT increases ~1.8× from 25 °C to 150 °C, implying a typical value near 2.3 V - but design must use 1.3 V max as worst-case limit for gate driver compliance.

T3035H-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):: 30 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 283A, 270A

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

Current - Hold (Ih) (Max):: 60 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB Insulated

T3035H-8I FAQ

1.How can I place an order for T3035H-8I through Aetrix?

Please submit a Request for Quotation (RFQ) for T3035H-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 T3035H-8I reliable?

The price and inventory of T3035H-8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T3035H-8I is usually 5 days.

3.What payment methods are accepted for T3035H-8I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T3035H-8I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T3035H-8I?

T3035H-8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T3035H-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 T3035H-8I?

For technical support, including T3035H-8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T3035H-8I requirements.

6.How does Aetrix verify that T3035H-8I is sourced from the original manufacturer or authorized distributors?

All T3035H-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 T3035H-8I meets industry standards.

7.What is the process for return or replacement of T3035H-8I?

All T3035H-8I units undergo pre-shipment inspection (PSI). If there is an issue with T3035H-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 T3035H-8I part is unused and in its original packaging.

Return procedure for T3035H-8I:

1.Submit a request within 90 days.

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

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