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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1235H-6G

Name: T1235H-6G
Brand: STMicroelectronics
SKU: T1235H-6G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T1235H-6G

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T1235H-6G.pdf

Description:: TRIAC ALTERNISTOR 600V 12A D2PAK

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Product details

Overview

T1235H-6G from STMicroelectronics is a snubberless 12 A, 600 V RMS triac in D2PAK package, designed for high-temperature AC mains switching in universal motor loads. It supports 150 °C junction turn-off commutation, delivers 50 A/µs dI/dt at Tj = 150 °C, and features 1.4 °C/W junction-to-case thermal resistance - enabling compact heatsink design in vacuum cleaner and washing machine drum motor drives.

For engineers reviewing the T1235H-6G datasheet, T1235H-6G pinout, T1235H-6G application, or T1235H-6G equivalent, key selection criteria include its 35 mA max gate trigger current (Quadrants I–III), 1000 V/µs dV/dt immunity at 150 °C, and Snubberless™ operation eliminating external RC networks in resistive and inductive AC loads.

Technical Context

This triac operates as a bidirectional AC switch with three-quadrant triggering capability (Quadrants I, II, III), supporting phase-angle and zero-crossing control topologies. Its internal ceramic pad provides 2500 V_rms isolation between MT1/MT2 and the tab, and it is rated for repetitive surge currents up to 120 A (50 Hz, 20 ms).

The device uses clip-bonding construction to achieve low thermal resistance (1.4 °C/W j-c) and stable commutation at Tj = 150 °C - critical for high-power-density motor control where thermal derating of conventional triacs limits performance.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	12 A - continuous RMS on-state current at Tc = 130 °C, suitable for 1.5 kW AC motor loads
VDRM/VRRM	600 V - peak repetitive blocking voltage, compatible with 230 VAC mains with safety margin
IGT (max)	35 mA - maximum gate trigger current across all quadrants, enabling direct drive from MCU GPIOs with minimal buffer
dI/dt (crit)	50 A/µs at Tj = 150 °C - high commutation robustness without snubber, reducing BOM count
Rth(j-c)	1.4 °C/W - low thermal resistance enables smaller heatsinks vs. TO-220AB alternatives
(dI/dt)c	16 A/ms - minimum critical rate of decrease of on-state current without false turn-off
dV/dt (min)	1000 V/µs at Tj = 150 °C - high noise immunity in EMI-prone motor drive environments

Pinout & Package

D2PAK (TO-263) surface-mount package with isolated copper tab; UL certified (E81734), RoHS compliant, ECOPACK® grade 2.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Current return path for both polarities; electrically tied to tab in non-insulated variants
A2 (MT2)	Main Terminal 2	Primary current path; connects to AC line or load depending on topology
G	Gate	Trigger input controlling conduction onset; requires ≥35 mA pulse for reliable turn-on in all quadrants

Key Features

Feature	Design Value
Snubberless™ operation	Eliminates external RC snubber network, reducing component count and PCB area in AC motor controls
150 °C junction turn-off commutation	Enables full 12 A RMS rating at elevated ambient temperatures without forced cooling
Low Rth(j-c) = 1.4 °C/W	Reduces required heatsink volume by ~40% vs. standard TO-220 triacs at same power dissipation
2500 V_rms isolation (ceramic pad)	Permits safe mounting to grounded metal chassis without insulating hardware
UL certification (E81734)	Meets end-equipment safety requirements for household appliances without additional system-level isolation

Applications

Vacuum Cleaner Motor Control

Washing Machine Drum Motor

Use Scenario: Variable-speed suction control via phase-cut dimming in portable and upright vacuum cleaners.

IC Role / Device Role / Timing Role: Main AC power switch regulating motor torque and speed by adjusting conduction angle per half-cycle.

Use Value: Snubberless operation eliminates snubber losses and capacitor aging, improving long-term reliability in thermally constrained enclosures.

Use Scenario: Bidirectional drum rotation control in front-loading washing machines using single-phase universal motors.

IC Role / Device Role / Timing Role: High-current AC switch enabling forward/reverse direction change and spin-speed modulation.

Use Value: 150 °C Tj rating allows sustained 12 A operation during high-torque spin cycles without thermal shutdown.

Industrial Fan Speed Regulator

Power Tool Motor Driver

Use Scenario: Heavy-duty HVAC fan control in commercial buildings with variable airflow demand.

IC Role / Device Role / Timing Role: Mains-connected triac delivering phase-controlled power to shaded-pole or PSC induction motors.

Use Value: 1000 V/µs dV/dt immunity prevents false triggering from motor back-EMF transients during rapid load changes.

Use Scenario: Compact corded power tools (e.g., drills, sanders) requiring high starting torque and variable speed.

IC Role / Device Role / Timing Role: Primary AC switching element interfacing directly with universal motor windings.

Use Value: Clip-bonded construction ensures mechanical robustness under vibration and thermal cycling typical in handheld tool operation.

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
BTB12-600CW	12 A/600 V, TO-220AB package, 50 mA IGT, Rth(j-c) = 2.0 °C/W	Larger footprint, higher thermal resistance, requires larger heatsink	Select when through-hole assembly or legacy board layout mandates TO-220AB
T1235H-6T	Identical electrical specs, TO-220AB package, non-isolated tab	No internal ceramic insulation; requires insulating washer for chassis mounting	Select when cost-sensitive designs allow manual isolation and avoid D2PAK reflow constraints

Compared with BTB12-600CW and T1235H-6T, the T1235H-6G offers superior thermal performance (1.4 vs. 2.0/1.7 °C/W), integrated 2500 V_rms isolation, and surface-mount compatibility - making it optimal for space-constrained, high-reliability motor control modules.

Availability

T1235H-6G is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum drive, and industrial fan speed regulation requiring stable component supply across multi-year production cycles.

Supply support for T1235H-6G 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The T12xxH series belongs to ST's high-temperature snubberless triac product line, engineered specifically for compact, thermally demanding AC motor control in household appliances and industrial equipment.

FAQ

What is the maximum junction temperature for continuous operation?

The T1235H-6G is rated for continuous operation up to 150 °C junction temperature, with guaranteed turn-off commutation capability at this limit. Absolute maximum storage and operating junction temperature range is –40 °C to +150 °C, as confirmed in Table 2 of ST's Doc ID 13574 Rev 2.

Does T1235H-6G require an external snubber circuit?

No - the T1235H-6G is a Snubberless™ triac, meaning it incorporates internal design features that eliminate the need for external RC snubber networks in most resistive and inductive AC switching applications, including universal motor loads.

How does the D2PAK package compare thermally to TO-220AB versions?

The D2PAK (T1235H-6G) has Rth(j-c) = 1.4 °C/W, versus 1.7 °C/W for T1235H-6T (TO-220AB non-isolated) and 2.0 °C/W for BTB12-600CW. This lower thermal resistance allows higher power density and reduced heatsink size in surface-mount designs.

Is the tab electrically isolated in the T1235H-6G package?

No - the D2PAK package of T1235H-6G does not include internal electrical isolation between the tab and MT1/MT2 terminals. For isolated mounting, use the T1235H-6I variant (TO-220AB Insulated), which integrates a ceramic pad rated for 2500 V_rms.

T1235H-6G Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

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

Packaging:: Tube

Product Status:: Active

Triac Type:: Alternistor - Snubberless

Voltage - Off State:: 600 V

Current - On State (It (RMS)) (Max):: 12 A

Voltage - Gate Trigger (Vgt) (Max):: 1 V

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

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:: Surface Mount

Supplier Device Package:: D2PAK

T1235H-6G FAQ

1.How can I place an order for T1235H-6G through Aetrix?

Please submit a Request for Quotation (RFQ) for T1235H-6G 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 T1235H-6G reliable?

The price and inventory of T1235H-6G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1235H-6G is usually 5 days.

3.What payment methods are accepted for T1235H-6G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1235H-6G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T1235H-6G?

T1235H-6G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T1235H-6G 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 T1235H-6G?

For technical support, including T1235H-6G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1235H-6G requirements.

6.How does Aetrix verify that T1235H-6G is sourced from the original manufacturer or authorized distributors?

All T1235H-6G 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 T1235H-6G meets industry standards.

7.What is the process for return or replacement of T1235H-6G?

All T1235H-6G units undergo pre-shipment inspection (PSI). If there is an issue with T1235H-6G, 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 T1235H-6G part is unused and in its original packaging.

Return procedure for T1235H-6G:

1.Submit a request within 90 days.

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

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