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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1250H-6I

Name: T1250H-6I
Brand: STMicroelectronics
SKU: T1250H-6I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T1250H-6I

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: T1250H-6I.pdf

Description:: TRIAC ALTERNISTOR 600V 12A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:3,630

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Product details

Overview

T1250H-6I from STMicroelectronics is a 12 A, 600 V Snubberless™ Triac in insulated TO-220AB package, designed for high-temperature AC mains switching with guaranteed 150 °C junction operation, 50 A/µs dI/dt capability, and 1500 V/µs dV/dt immunity-used in vacuum cleaner and washing machine drum motor controls.

For engineers reviewing the T1250H-6I datasheet, T1250H-6I pinout, T1250H-6I application, or T1250H-6I equivalent, this page delivers verified thermal resistance (Rth(j-c) = 3.3 °C/W), gate trigger current (IGT = 50 mA), critical commutation ratings, and insulation-rated packaging for high-reliability universal motor drive design.

Technical Context

This Triac operates across all four quadrants but delivers highest commutation robustness in Quadrants I, II, and III-enabling reliable zero-crossing and phase-angle control in inductive loads. Its internal ceramic pad provides 2500 V_rms isolation between MT1/MT2 terminals and heatsink-mounting tab.

The device uses clip-bonding to achieve low thermal resistance and sustain 12 A RMS at T_c = 120 °C without external snubber, leveraging high dI/dt (50 A/µs) and dV/dt (1500 V/µs) margins at 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	12 A - Sustains full-sine AC load current up to 120 °C case temperature in insulated TO-220AB package
VDRM / VRRM	600 V - Blocks 600 V peak AC line voltage with margin for transients and surges
IGT (Quadrants I–III)	50 mA max - Low gate drive requirement compatible with standard microcontroller GPIO or optocoupler outputs
(dI/dt)c @ 150 °C	21 A/ms min - Enables reliable turn-off under high-current inductive loads without snubber network
Rth(j-c)	3.3 °C/W - Enables compact heatsink design due to low junction-to-case thermal resistance
dV/dt @ 150 °C	1500 V/µs min - Prevents false triggering during fast-rising line transients in noisy industrial environments
Isolation Voltage	2500 V_rms - Achieved via internal ceramic pad; allows direct mounting to grounded heatsink without insulating washer

Pinout & Package

Package: TO-220AB Insulated (ECOPACK® compliant, UL E81734 certified, RoHS 2002/95/EC). Tab is electrically isolated from MT1/MT2 terminals by internal ceramic dielectric layer.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate trigger and load return path; connected to heatsink potential only via isolation barrier
A2 (MT2)	Main Terminal 2	High-side AC line connection; carries full load current; electrically isolated from tab
G	Gate	Control input referenced to A1; triggers conduction when IGT ≥ 50 mA (QI–QIII); polarity-sensitive for QIV

Key Features

Feature	Design Value
Snubberless™ operation	Eliminates external RC snubber components in 12 A universal motor drives, reducing BOM count and PCB area
150 °C junction rating	Enables continuous operation at elevated ambient temperatures where conventional triacs derate below 10 A
Low Rth(j-c) = 3.3 °C/W	Reduces required heatsink volume by ~40% vs. standard TO-220AB triacs at same power dissipation
2500 V_rms isolation	Permits direct mechanical mounting to grounded chassis without insulating hardware or thermal interface degradation
UL certification (E81734)	Validates safety compliance for end-equipment approvals in North American household appliance markets

Applications

Vacuum Cleaner Motor Control

Washing Machine Drum Drive

Use Scenario: Phase-controlled speed regulation of series-wound universal motors in portable vacuum cleaners with compact enclosure and limited airflow.

IC Role / Device Role / Timing Role: Main AC power switch enabling variable torque/speed via firing angle adjustment; handles 12 A peak inrush and 8 A RMS continuous.

Use Value: Snubberless operation avoids snubber losses and component stress; 150 °C rating maintains reliability despite enclosed thermal environment.

Use Scenario: Bidirectional AC switching for reversible drum motor in front-load washing machines, operating under high humidity and vibration.

IC Role / Device Role / Timing Role: High-reliability mains switch controlling motor direction and spin speed; withstands repeated surge currents up to 126 A (60 Hz).

Use Value: Isolated tab eliminates risk of ground loop or shock hazard in wet environments; UL certification supports full system safety approval.

Industrial Fan Speed Control

Power Tool Trigger Circuitry

Use Scenario: Duty-cycle modulated AC fan control in HVAC blowers requiring stable airflow over wide ambient temperature range (-25 °C to +70 °C).

IC Role / Device Role / Timing Role: Mains-interrupting switch triggered by zero-crossing detector IC; sustains 12 A RMS at 120 °C case temperature.

Use Value: High dV/dt immunity prevents false turn-on from EMI generated by adjacent relays or inverters in control panels.

Use Scenario: Triggered AC switching in corded power tools (e.g., drills, sanders) with momentary push-button activation and rapid thermal cycling.

IC Role / Device Role / Timing Role: High-current AC switch interfacing with mechanical trigger switch and soft-start circuitry; rated for >100,000 cycles.

Use Value: Clip-bond construction ensures mechanical robustness against vibration-induced bond fatigue; low Rth(j-c) enables consistent performance across duty cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-temperature triac applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB12-600CW	12 A, 600 V, non-insulated TO-220AB; Rth(j-c) = 1.4 °C/W; no internal isolation; requires external insulator	Suitable for cost-sensitive designs where heatsink is floating or isolated externally; lacks 2500 V_rms certified isolation	Select when thermal performance is prioritized over safety certification and mounting simplicity
T1235H-6I	Same package and isolation; lower IGT (35 mA max) but reduced dV/dt (1000 V/µs) and (dI/dt)c (16 A/ms)	Better for low-noise, low-EMI systems with stable gate drive; less robust in high-dV/dt industrial settings	Select when gate drive capability is limited and load transients are well-controlled

Compared with BTB12-600CW, T1250H-6I trades slightly higher thermal resistance for certified isolation and simplified mounting; versus T1235H-6I, it delivers superior commutation margins essential for aggressive phase-control in universal motors.

Availability

T1250H-6I 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, long-lifecycle support, and UL-certified isolation.

Supply support for T1250H-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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The Snubberless™ Triac product line targets high-reliability AC power control in space-constrained, thermally demanding appliances-emphasizing integration, safety certification, and snubber-free operation in universal motor and resistive load switching.

FAQ

What is the maximum allowable case temperature for continuous 12 A RMS operation?

The T1250H-6I supports 12 A RMS continuous conduction at T_c = 120 °C in insulated TO-220AB package, as specified in Table 2 of Doc ID 13574 Rev 2. Exceeding this temperature requires derating per Figure 2, which shows linear reduction to 0 A at 150 °C junction temperature.

Does the 2500 V_rms isolation rating apply to DC or AC voltage?

The 2500 V_rms isolation rating is an AC withstand voltage specification verified per UL E81734 test conditions, measured at 50/60 Hz for 1 minute. It does not imply DC breakdown rating; DC isolation must be validated separately per end-equipment safety standards.

Can T1250H-6I replace T1235H-6I in existing designs without layout changes?

Yes-both share identical TO-220AB Insulated package dimensions, pinout, and mounting footprint. However, T1250H-6I's higher IGT (50 mA vs. 35 mA) and improved dV/dt (1500 V/µs vs. 1000 V/µs) may require verification of gate drive strength and noise immunity in the target application.

Is the insulated tab rated for direct contact with a grounded metal chassis?

Yes-the internal ceramic pad provides reinforced insulation certified to 2500 V_rms, allowing direct mechanical mounting to grounded chassis without additional insulators. This configuration meets creepage/clearance requirements for Class I appliances per IEC 60335-1.

T1250H-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):: 12 A

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

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

Current - Gate Trigger (Igt) (Max):: 50 mA

Current - Hold (Ih) (Max):: 75 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

T1250H-6I FAQ

1.How can I place an order for T1250H-6I through Aetrix?

Please submit a Request for Quotation (RFQ) for T1250H-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 T1250H-6I reliable?

The price and inventory of T1250H-6I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1250H-6I is usually 5 days.

3.What payment methods are accepted for T1250H-6I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1250H-6I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T1250H-6I?

T1250H-6I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T1250H-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 T1250H-6I?

For technical support, including T1250H-6I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1250H-6I requirements.

6.How does Aetrix verify that T1250H-6I is sourced from the original manufacturer or authorized distributors?

All T1250H-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 T1250H-6I meets industry standards.

7.What is the process for return or replacement of T1250H-6I?

All T1250H-6I units undergo pre-shipment inspection (PSI). If there is an issue with T1250H-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 T1250H-6I part is unused and in its original packaging.

Return procedure for T1250H-6I:

1.Submit a request within 90 days.

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

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