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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics BTA12-700BWRG

Name: BTA12-700BWRG
Brand: STMicroelectronics
SKU: BTA12-700BWRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BTA12-700BWRG

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: BTA12-700BWRG.pdf

Description:: TRIAC ALTERNISTOR 700V 12A TO220

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Product details

Overview

BTA12-700BWRG from STMicroelectronics is a 12 A RMS, 700 V repetitive peak off-state voltage (VDRM/VRRM), insulated TO-220AB triac designed for phase control and static switching in resistive or inductive AC loads. It delivers 125 A non-repetitive surge current (8.3 ms), 72 A²s I²t rating, and 10 V/µs critical dV/dt at 110 °C junction temperature.

For engineers reviewing the BTA12-700BWRG datasheet, BTA12-700BWRG pinout, BTA12-700BWRG application, or BTA12-700BWRG equivalent, key selection criteria include insulated package safety (2500 V_RMS UL E81734), high commutation robustness (dV/dt_c > 5 V/µs), gate trigger sensitivity (IGT ≤ 50 mA), and thermal resistance (R_th(j-c) = 3.3 °C/W).

Technical Context

This triac operates as a bidirectional AC switch with four-quadrant triggering capability (I–IV), enabling full-wave phase-angle control without external polarity management. Its glass-passivated PNPN structure ensures stable latching and holding behavior across -40 to +125 °C operating junction range.

Designed for line-frequency (50/60 Hz) AC power control, it supports 360° conduction with DC-rated junction-to-case thermal resistance of 3.3 °C/W and withstands 250 V/µs transient dV/dt at 110 °C before false triggering.

Key Specifications

Parameter	Value and Actual Design Meaning
VDRM / VRRM	700 V - Maximum repetitive blocking voltage in both directions; defines maximum AC line voltage compatibility (e.g., 480 VAC systems with margin)
IT(RMS)	12 A - Continuous RMS load current at Tc = 90 °C; determines heatsink sizing for sustained conduction
ITSM (8.3 ms)	125 A - Peak non-repetitive surge current; supports motor startup or lamp inrush without failure
I²t (10 ms)	72 A²s - Fusing energy threshold; used to coordinate with fast-acting AC fuses for short-circuit protection
dV/dt_c	>5 V/µs - Minimum rate of voltage rise that avoids false turn-on during commutation; critical for inductive load snubber design
IGT (Quadrant I)	≤50 mA - Max gate trigger current required; enables direct drive from microcontroller GPIO via 220 Ω resistor at 12 V
R_th(j-c)	3.3 °C/W - Junction-to-case thermal resistance; sets minimum thermal interface conductance needed to maintain Tj ≤ 125 °C

Pinout & Package

Package: TO-220AB plastic, insulated (UL E81734 recognized), 2500 V_RMS isolation between case and terminals. Mounting torque: 0.8 m·N (recommended), max 1.0 m·N.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Anode of first SCR segment; common reference for gate triggering and load return path
A2 (MT2)	Main Terminal 2	Anode of second SCR segment; connects to AC line or load hot side; polarity determines quadrant operation
G	Gate	Control electrode; triggers conduction when ≥IGT pulse applied with respect to A1; sensitive to dI/dt and diG/dt

Key Features

Feature	Design Value
Insulated TO-220AB package	2500 V_RMS isolation meets UL E81734; eliminates need for additional creepage/clearance barriers in Class I appliances
High commutation immunity	(dV/dt)_c > 5 V/µs at 110 °C ensures reliable turn-off under reactive load transients without snubber overdesign
Four-quadrant gate trigger	Operates with gate pulses referenced to A1 in all quadrants (I–IV); simplifies driver circuitry vs. three-quadrant alternatives
High surge robustness	125 A ITSM (8.3 ms) supports 10× rated current surges typical in fan, pump, and heater startup cycles

Applications

AC Motor Speed Control

Industrial Heater Regulation

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

IC Role / Device Role / Timing Role: Bidirectional AC switch implementing phase-angle firing synchronized to zero-crossing detection.

Use Value: Enables precise torque and RPM adjustment while maintaining high efficiency and low EMI due to controlled dI/dt (10 A/µs).

Use Scenario: Closed-loop temperature regulation of resistive heating elements in ovens, soldering stations, and plastic extruders.

IC Role / Device Role / Timing Role: Static AC power switch modulating RMS power delivery based on PID output signal.

Use Value: Delivers 12 A continuous current with 72 A²s I²t rating, allowing safe cycling against thermal stress and fuse coordination.

Light Dimming Systems

Power Supply Inrush Limiting

Use Scenario: Leading-edge dimming for incandescent and halogen lamps in residential and commercial lighting.

IC Role / Device Role / Timing Role: Phase-controlled AC switch triggered after adjustable delay from zero-crossing to set brightness level.

Use Value: 50 mA max IGT enables direct microcontroller drive; insulated package prevents ground-loop noise coupling into analog dimmer circuits.

Use Scenario: Soft-start sequencing for large-capacitor input stages in industrial SMPS and UPS systems.

IC Role / Device Role / Timing Role: Inrush current limiter bypassed after capacitor charging completes, using timed gate pulse.

Use Value: Withstands 125 A surge (8.3 ms) during cold-start capacitor charging while maintaining <1.5 V on-state drop (VTM) to minimize power loss.

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
BTB12-700BW	Uninsulated TO-220AB package; R_th(j-c) = 2.7 °C/W; no UL isolation rating	Requires external insulation for user-accessible chassis; better thermal performance in metal-clad enclosures	Select when mechanical mounting allows direct heatsink contact and safety standards permit uninsulated construction
Q6012LH5	Littelfuse 12 A, 600 V triac; IGT ≤ 50 mA; dV/dt_c = 10 V/µs; TO-220 package	Lower VDRM limits use to 277 VAC systems; higher dV/dt immunity reduces snubber needs	Prefer where higher commutation margin is critical and 700 V blocking is not required

Compared with BTB12-700BW, BTA12-700BWRG trades 0.6 °C/W higher thermal resistance for certified insulation and safety compliance; versus Q6012LH5, it offers 100 V higher blocking voltage at the cost of slightly lower dV/dt immunity.

Availability

BTA12-700BWRG is available at Aetrix Electronics and suitable for AC motor speed control, industrial heater regulation, light dimming systems, and power supply inrush limiting requiring stable component supply and long-term industrial lifecycle support.

Supply support for BTA12-700BWRG 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/BTB12 series was engineered for high-reliability AC power control in harsh environments, emphasizing surge resilience, thermal stability, and safety-certified packaging for appliance and factory automation applications.

FAQ

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

The datasheet specifies IT(RMS) = 12 A at Tc = 90 °C. Exceeding this temperature requires derating per Fig.4; at 100 °C case temperature, maximum RMS current drops to ~10.5 A to maintain junction temperature ≤125 °C with R_th(j-c) = 3.3 °C/W.

Does BTA12-700BWRG require a heat sink in all applications?

Yes - even at 12 A RMS, power dissipation exceeds 1.5 W (VTM × IT). Without a heatsink, junction temperature would exceed 125 °C rapidly. The 3.3 °C/W R_th(j-c) mandates a heatsink with ≤10 °C/W total thermal resistance (including interface) for ambient temperatures above 40 °C.

Can this triac be triggered directly by a 3.3 V microcontroller GPIO?

No - IGT max is 50 mA at 25 °C, but gate trigger voltage VGT is 1.5 V max. A 3.3 V GPIO cannot reliably source 50 mA into the gate without exceeding safe current limits. A buffer stage (e.g., MOC3021 optocoupler or transistor driver) is required for robust triggering.

Is the 2500 V_RMS insulation rating tested per UL standard?

Yes - the device carries UL recognition E81734, confirming compliance with UL 1557 for reinforced insulation. This rating applies between the metal tab (case) and all three terminals (A1, A2, G), verified at 2500 V_RMS for 60 seconds during production testing.

BTA12-700BWRG 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:: 700 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-220

BTA12-700BWRG FAQ

1.How can I place an order for BTA12-700BWRG through Aetrix?

Please submit a Request for Quotation (RFQ) for BTA12-700BWRG 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 BTA12-700BWRG reliable?

The price and inventory of BTA12-700BWRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA12-700BWRG is usually 5 days.

3.What payment methods are accepted for BTA12-700BWRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA12-700BWRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BTA12-700BWRG?

BTA12-700BWRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BTA12-700BWRG 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 BTA12-700BWRG?

For technical support, including BTA12-700BWRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA12-700BWRG requirements.

6.How does Aetrix verify that BTA12-700BWRG is sourced from the original manufacturer or authorized distributors?

All BTA12-700BWRG 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 BTA12-700BWRG meets industry standards.

7.What is the process for return or replacement of BTA12-700BWRG?

All BTA12-700BWRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA12-700BWRG, 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 BTA12-700BWRG part is unused and in its original packaging.

Return procedure for BTA12-700BWRG:

1.Submit a request within 90 days.

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

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