Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics BTA12-800BWRG

Name: BTA12-800BWRG
Brand: STMicroelectronics
SKU: BTA12-800BWRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BTA12-800BWRG

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: BTA12-800BWRG.pdf

Description:: TRIAC ALTERNSTR 800V 12A TO220AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:709

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BTA12-800BWRG from STMicroelectronics is a 12 A, 800 V insulated Snubberless™ triac in TO-220AB Ins. package, designed for robust AC mains switching in inductive loads. It delivers 50 mA gate trigger current (IGT), 2500 VRMS isolated tab rating per UL 81734, and supports high commutation performance in 3-quadrant operation - enabling reliable phase control in motor speed controllers and static relays without external snubbers.

For engineers reviewing the BTA12-800BWRG datasheet, BTA12-800BWRG pinout, BTA12-800BWRG application, or BTA12-800BWRG equivalent, key selection criteria include insulated thermal path capability, dV/dt immunity up to 1000 V/µs at 125 °C, I²t rating of 78 A²s, and compatibility with logic-level gate drive circuits requiring ≤50 mA trigger current.

Technical Context

This triac operates in 3-quadrant mode with gate sensitivity optimized for Snubberless™ inductive load switching. Its internal ceramic insulation enables 2500 VRMS isolation between tab and die, meeting UL 1557 (file E81734), while junction-to-case thermal resistance is rated at 2.3 °C/W for sustained 12 A RMS conduction at Tc = 90 °C.

The device features a critical rate of rise of on-state current (dl/dt) of 50 A/µs and commutation capability validated at 1000 V/µs dV/dt under open-gate conditions at 125 °C - essential for noise-immune operation in appliance motor drives and industrial heating regulation where voltage transients are common.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	12 A - Sustained AC load current handling at Tc = 90 °C, suitable for 1.5 kW resistive or 1.2 kW inductive mains loads.
VDRM / VRRM	800 V - Peak repetitive off-state blocking voltage, providing 2× safety margin over 230 VAC RMS mains with surge tolerance.
IGT (Snubberless™)	50 mA - Gate trigger current maximum at 12 V, enabling direct drive from microcontroller GPIO or low-power optocouplers.
dV/dt (min)	1000 V/µs - Minimum rate of voltage rise immunity at 125 °C, eliminating need for snubber networks in fan/motor control.
Rth(j-c)	2.3 °C/W - Junction-to-case thermal resistance, defining heatsink requirement for 12 A continuous operation with <100 °C junction rise.
Isolation Rating	2500 VRMS - Reinforced insulation between metal tab and semiconductor die, certified to UL 1557 (E81734).
I²t (fusing)	78 A²s - Single-cycle surge energy withstand, supporting 120 A non-repetitive peak current for 20 ms at 50 Hz.

Pinout & Package

TO-220AB Insulated package with electrically isolated metal tab (rated 2500 VRMS), epoxy body meeting UL 94 V0, and recommended mounting torque of 0.55 N·m.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate triggering; connected to neutral or low-side AC line in standard configurations.
A2 (MT2)	Main Terminal 2	High-current AC output terminal; carries full load current and connects to hot line or inductive load.
G	Gate	Control input; triggers conduction when ≥50 mA pulse applied relative to A1, enabling precise phase-angle control.

Key Features

Feature	Design Value
Snubberless™ 3Q operation	Enables direct switching of inductive loads (e.g., universal motors) without RC snubber networks, reducing BOM count and board space.
UL 1557 certified isolation	2500 VRMS reinforced insulation meets safety standards for Class I appliances and industrial controls requiring barrier integrity.
Low thermal resistance	2.3 °C/W junction-to-case allows 12 A RMS operation with compact heatsinks, improving power density in space-constrained designs.
High dV/dt immunity	1000 V/µs minimum at 125 °C ensures reliable turn-off during voltage transients in motor commutation or relay bounce events.
RoHS-compliant ECOPACK®2	Lead-free terminations and halogen-free molding compound meet EU Directive 2011/65/EU without compromising thermal or electrical performance.

Applications

Induction Motor Speed Control

Industrial Heating Regulation

Use Scenario: Variable-speed control of single-phase induction motors in HVAC blowers and pump drivers.

IC Role / Device Role / Timing Role: Main AC power switch executing phase-angle firing synchronized to zero-crossing detection for smooth torque delivery.

Use Value: Eliminates snubber components and reduces EMI generation, enabling compact, thermally efficient motor driver PCBs compliant with IEC 61800-3.

Use Scenario: Precise temperature maintenance in industrial ovens and plastic extruders using resistive heating elements.

IC Role / Device Role / Timing Role: High-reliability ON/OFF switching element controlled by PID output via optocoupler-isolated gate drive.

Use Value: 2500 VRMS isolation prevents ground-loop faults in multi-zone heater systems, enhancing system safety and long-term stability.

Static Relay Replacement

Appliance Light Dimming

Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules and building automation panels.

IC Role / Device Role / Timing Role: Fail-safe AC switching component with galvanic isolation, driven by 3.3 V/5 V logic-level signals.

Use Value: 50 mA IGT and 12 A RMS rating support direct MCU interface without buffer stages, extending relay lifetime beyond 1 million cycles.

Use Scenario: Leading-edge dimming of LED-compatible incandescent lamps in smart home lighting systems.

IC Role / Device Role / Timing Role: Phase-controlled AC switch triggered by microcontroller PWM-modulated gate pulses for adjustable brightness.

Use Value: Snubberless™ operation suppresses audible coil whine and eliminates capacitor aging concerns in consumer-grade dimmer modules.

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
BTB12-800BW	Non-insulated TO-220AB package; no 2500 VRMS isolation; Rth(j-c) = 1.4 °C/W.	Requires external insulation or chassis grounding; unsuitable for double-insulated appliances.	Select when heatsinking efficiency is prioritized over safety isolation and system-level creepage/clearance constraints allow non-insulated mounting.
T1250-800G	D²PAK surface-mount package; same 50 mA IGT and 800 V rating; Rth(j-c) = 1.4 °C/W; no tab isolation.	Designed for automated assembly; lacks reinforced insulation; requires PCB-level isolation design.	Choose for high-volume SMT production where board space is constrained and thermal management uses large copper pours instead of mechanical heatsinks.

Compared with BTB12-800BW and T1250-800G, BTA12-800BWRG uniquely provides certified 2500 VRMS isolation in a through-hole package - making it the only option among the three that satisfies UL Class II appliance requirements without additional system-level insulation measures.

Availability

BTA12-800BWRG is available at Aetrix Electronics and suitable for industrial motor control, commercial heating systems, and appliance power management requiring stable component supply across extended product lifecycles.

Supply support for BTA12-800BWRG 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, specializing in power management, analog, and discrete devices for industrial, automotive, and consumer markets.

The BTA series belongs to ST's high-reliability AC power switching portfolio, engineered specifically for mains-connected equipment demanding safety-certified isolation, high commutation robustness, and long-term thermal stability in harsh environments.

FAQ

What is the maximum junction temperature for continuous operation?

The BTA12-800BWRG has an operating junction temperature range of –40 °C to +125 °C. For continuous 12 A RMS conduction, case temperature must be maintained at or below 90 °C per absolute maximum ratings - requiring appropriate heatsinking to limit thermal resistance from junction to ambient.

Does this triac require a heat sink in all applications?

Yes - due to its 2.3 °C/W junction-to-case thermal resistance and 12 A RMS rating, a heatsink is mandatory for any application drawing >2 A continuously. Derating curves in DS2115 show usable current drops to ~3.5 A at 70 °C ambient with no heatsink, confirming active thermal management is essential for rated performance.

Can BTA12-800BWRG replace BTA12-600BWRG in existing designs?

Yes - both share identical package, pinout, gate sensitivity (50 mA), and thermal characteristics. The 800 V VDRM/VRRM rating provides higher transient margin than the 600 V version, with no trade-offs in conduction loss or switching behavior, making it a safe drop-in upgrade for improved surge resilience.

Is the insulated tab rated for functional or safety isolation?

The 2500 VRMS isolation rating is certified for safety isolation per UL 1557 (file E81734), meaning it provides reinforced insulation between the tab and semiconductor die - sufficient for basic and supplementary insulation in Class I and Class II end equipment, not merely functional separation.

BTA12-800BWRG 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):: 12 A

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

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

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

Current - Hold (Ih) (Max):: 50 mA

Configuration:: Single

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB Insulated

BTA12-800BWRG FAQ

1.How can I place an order for BTA12-800BWRG through Aetrix?

Please submit a Request for Quotation (RFQ) for BTA12-800BWRG 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 BTA12-800BWRG reliable?

The price and inventory of BTA12-800BWRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA12-800BWRG is usually 5 days.

3.What payment methods are accepted for BTA12-800BWRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA12-800BWRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BTA12-800BWRG?

BTA12-800BWRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BTA12-800BWRG 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 BTA12-800BWRG?

For technical support, including BTA12-800BWRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA12-800BWRG requirements.

6.How does Aetrix verify that BTA12-800BWRG is sourced from the original manufacturer or authorized distributors?

All BTA12-800BWRG 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 BTA12-800BWRG meets industry standards.

7.What is the process for return or replacement of BTA12-800BWRG?

All BTA12-800BWRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA12-800BWRG, 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 BTA12-800BWRG part is unused and in its original packaging.

Return procedure for BTA12-800BWRG:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…