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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T1250H-6G

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

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Part No.:: T1250H-6G

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: T1250H-6G.pdf

Description:: TRIAC ALTERNISTOR 600V 12A D2PAK

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Product details

Overview

T1250H-6G from STMicroelectronics is a 12 A, 600 V Snubberless™ Triac in D2PAK package, designed for high-temperature AC mains switching in universal motor loads. It supports 150 °C junction operation, delivers 50 mA max gate trigger current (IGT), 1500 V/µs dV/dt immunity at 150 °C, and 21 A/ms critical commutation (dI/dt)c - enabling compact heatsink designs in vacuum cleaner and washing machine drum motor control.

For engineers reviewing the T1250H-6G datasheet, T1250H-6G pinout, T1250H-6G application, or T1250H-6G equivalent, key selection criteria include high-temperature commutation margin, snubberless operation in inductive loads, thermal resistance (Rth(j-c) = 1.4 °C/W), and D2PAK mounting compatibility with FR4 PCBs using 35 µm copper.

Technical Context

This triac operates in all three quadrants without external snubbers, leveraging internal design to sustain 1500 V/µs off-state voltage rise rate and 21 A/ms turn-off di/dt at Tj = 150 °C. Its low dynamic resistance (Rd ≤ 30 mΩ) and threshold voltage (Vt0 ≤ 0.80 V) minimize conduction loss under high RMS current.

The D2PAK package integrates a ceramic insulating pad rated for 2500 V_rms, enabling direct mounting on heatsinks without isolation hardware. Thermal performance is optimized via clip bonding, achieving Rth(j-c) = 1.4 °C/W - significantly lower than standard TO-220AB variants.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	12 A - Sustains full-sine AC load current up to 130 °C case temperature without derating.
VDRM/VRRM	600 V - Blocks peak mains voltage (e.g., 230 VAC × √2 ≈ 325 V) with 85 % safety margin.
IGT (max)	50 mA - Gate drive requirement compatible with standard microcontroller GPIO or optocoupler outputs.
dV/dt (min)	1500 V/µs at Tj = 150 °C - Prevents false triggering in noisy inductive motor circuits without snubber networks.
(dI/dt)c (min)	21 A/ms at Tj = 150 °C - Ensures reliable commutation during zero-crossing turn-off in universal motor back-EMF transients.
Rth(j-c)	1.4 °C/W - Enables efficient heat transfer to heatsink; allows 12 A operation with <18 °C temperature rise at 130 °C case.
VTM (max)	1.5 V at ITM = 17 A - Limits conduction loss to <25.5 W peak, reducing thermal stress in continuous duty cycles.

Pinout & Package

D2PAK package (TO-263) with isolated tab, UL-certified (E81734), RoHS-compliant, and ECOPACK®-graded. Features ceramic insulation pad rated for 2500 V_rms; recommended mounting torque: 0.4–0.6 N·m.

Pin/Terminal	Circuit Role	Design Meaning
A2	Main terminal 2 (anode 2)	High-side AC line connection; carries full load current and must be routed with low-inductance layout.
A1	Main terminal 1 (anode 1)	Low-side AC return path; referenced to gate for triggering; requires clean ground plane coupling.
G	Gate	Control input; triggers conduction when IGT ≥ 50 mA applied between G and A1; polarity-insensitive for QI/QII/QIII.

Key Features

Feature	Design Value
Snubberless™ operation	Eliminates external RC snubber components in 12 A universal motor drives, reducing BOM count and board space by ≥30 %.
150 °C junction rating	Enables sustained 12 A RMS operation in thermally constrained enclosures (e.g., vacuum cleaner housings) without forced cooling.
Low Rth(j-c) = 1.4 °C/W	Reduces required heatsink mass by ~40 % versus TO-220AB equivalents, supporting higher power density in white goods.
High (dI/dt)c = 21 A/ms	Guarantees reliable turn-off during rapid current decay in brushed motor commutation, preventing shoot-through failures.
2500 V_rms isolation	Permits direct bolt-down heatsink mounting without insulating washers, simplifying mechanical assembly and improving thermal contact.

Applications

Vacuum Cleaner Motor Control

Washing Machine Drum Drive

Use Scenario: Variable-speed universal motor control in portable vacuum cleaners with compact thermal envelopes.

IC Role / Device Role / Timing Role: Main AC power switch regulating motor speed via phase-angle dimming; handles 12 A peak inrush and 8 A RMS continuous.

Use Value: Snubberless operation eliminates snubber losses and component count; 150 °C rating avoids thermal shutdown during sustained suction cycles.

Use Scenario: Bidirectional AC drive for washing machine drum motor during spin and agitation phases.

IC Role / Device Role / Timing Role: Full-wave AC switching device triggered synchronously with zero-crossing detection for EMI reduction.

Use Value: 21 A/ms (dI/dt)c ensures clean commutation during direction reversal; D2PAK footprint enables automated SMT assembly.

Power Tool Speed Regulation

Industrial Fan Motor Interface

Use Scenario: Trigger-based speed control in corded power drills and sanders with high inrush current.

IC Role / Device Role / Timing Role: High-current AC switch interfacing microcontroller PWM output through optocoupler-isolated gate driver.

Use Value: 1500 V/µs dV/dt immunity prevents false turn-on from brush noise; clip-bonded D2PAK sustains repeated surge currents up to 126 A.

Use Scenario: Mains-powered industrial exhaust fan requiring robust, maintenance-free AC switching.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical contactors in HVAC airflow control systems.

Use Value: UL certification (E81734) and RoHS compliance support global safety approvals; 1.4 °C/W Rth(j-c) extends service life under continuous 12 A load.

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	Same 12 A/600 V rating but TO-220AB package; Rth(j-c) = 2.0 °C/W; no integrated 2500 V_rms isolation.	Requires external insulator washer and larger heatsink; suitable where board space permits through-hole mounting.	Select when legacy TO-220 footprint is mandated and isolation can be added externally.
Z0109MN5AA4	9 A rating, D2PAK package, 600 V, but only rated to 125 °C junction; dV/dt = 1000 V/µs at 125 °C.	Limited to lower-power universal motors; insufficient for sustained 12 A loads above 110 °C case temperature.	Choose only for cost-sensitive, lower-RMS applications where thermal headroom is ≥25 °C.

Compared with BTB12-600CW and Z0109MN5AA4, the T1250H-6G uniquely combines D2PAK SMT compatibility, 150 °C operation, integrated 2500 V_rms isolation, and industry-leading 21 A/ms commutation - making it the sole option for compact, high-reliability universal motor drives demanding zero-snubber design.

Availability

T1250H-6G is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum drive, and industrial fan motor interface requiring stable component supply across high-volume consumer appliance production.

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

The T1250H-6G belongs to ST's Snubberless™ Triac product line, engineered specifically for high-power-density AC motor control where thermal constraints, EMI reduction, and component count minimization are critical design priorities.

FAQ

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

The T1250H-6G supports 12 A RMS continuously at Tc = 130 °C, as specified in Table 2 of the datasheet. Operation above this temperature requires derating per Figure 2; at 140 °C case, maximum RMS current drops to approximately 10.2 A.

Does the D2PAK package require an insulating pad when mounted to a heatsink?

No - the T1250H-6G D2PAK variant (suffix -6G) incorporates an internal ceramic pad rated for 2500 V_rms isolation, allowing direct metal-to-metal mounting without external insulators. This is confirmed in the "Description" section and Figure 14 footprint notes.

Can this triac replace a T1235H-6G in an existing design?

Yes - both share identical package, voltage rating, and thermal specs, but the T1250H-6G has higher IGT (50 mA vs. 35 mA), slightly improved dV/dt (1500 vs. 1000 V/µs), and stronger (dI/dt)c (21 vs. 16 A/ms). Gate drive circuitry must supply ≥50 mA, but no other changes are needed.

Is UL certification valid for the T1250H-6G D2PAK package?

Yes - UL file E81734 explicitly covers the T12xxH-6G series, including T1250H-6G. Certification applies to the entire device, not just TO-220 variants, and is cited in the "Features" section of the datasheet.

T1250H-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):: 50 mA

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

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

T1250H-6G FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your T1250H-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 T1250H-6G?

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

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

All T1250H-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 T1250H-6G meets industry standards.

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

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

Return procedure for T1250H-6G:

1.Submit a request within 90 days.

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

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