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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics BTA12-700CWRG

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

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Part No.:: BTA12-700CWRG

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: BTA12-700CWRG.pdf

Description:: TRIAC ALTERNISTOR 700V 12A TO220

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Product details

Overview

BTA12-700CWRG 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 BTA12-700CWRG datasheet, BTA12-700CWRG pinout, BTA12-700CWRG application, or BTA12-700CWRG equivalent, key selection criteria include RMS current derating vs. case temperature, gate trigger sensitivity (IGT ≤ 25 mA, Quadrant C), commutation robustness (dV/dt ≥ 10 V/µs), and UL-recognized 2500 V_RMS insulation.

Technical Context

This triac operates as a bidirectional thyristor with four-quadrant triggering capability (I–IV), enabling full-wave AC control without external polarity management. Its glass-passivated PNPN structure ensures stable turn-on behavior under high di/dt stress (≥5.3 A/ms) and high-temperature operation up to 125 °C junction.

Thermal design relies on low junction-to-case resistance (R_th(j-c) = 2.5 °C/W DC for BTA variant) and requires heatsinking to sustain 12 A RMS conduction. Gate drive must meet I_GT ≤ 25 mA (Quadrant C) and V_GT ≤ 1.5 V at 25 °C, with holding current I_H ≤ 25 mA.

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; derates to ~8.5 A at 110 °C case temperature per Fig.4.
ITSM (8.3 ms)	125 A - Peak non-repetitive surge current; supports motor startup or lamp inrush without failure.
I²t (10 ms)	72 A²s - Energy withstand capability; used to coordinate with fast-acting fuses (e.g., gR type).
dV/dt (commutating)	≥10 V/µs - Minimum rate of rise of off-state voltage before false turn-on; ensures noise immunity in inductive switching.
IGT (Quadrant C)	≤25 mA - Max gate trigger current required; enables direct drive from microcontroller GPIO or optocoupler outputs.
Rth(j-c)	2.5 °C/W - Junction-to-case thermal resistance (DC); determines minimum heatsink requirement for thermal stability.

Pinout & Package

Package: TO-220AB (plastic, insulated), UL recognized (E81734), 2500 V_RMS isolation between mounting base 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 return path for bidirectional current flow.
A2 (MT2)	Main Terminal 2	Anode of second SCR segment; connects to AC line or load side depending on topology.
G	Gate	Control electrode; triggers conduction in all four quadrants; requires ≤25 mA pulse for reliable turn-on in Quadrant C.

Key Features

Feature	Design Value
High surge current capability	125 A non-repetitive (8.3 ms); sustains short-duration overloads without latch-up or thermal runaway.
UL-recognized insulation	2500 V_RMS isolation (E81734); eliminates need for additional creepage/clearance barriers in safety-critical AC interfaces.
Four-quadrant triggering	Operates with gate signal polarity independent of A2 voltage polarity; simplifies driver circuit design for universal AC phase control.
High commutation dV/dt	≥10 V/µs at 110 °C; prevents false triggering during rapid voltage transients in motor or transformer loads.
Low thermal resistance	R_th(j-c) = 2.5 °C/W (DC); enables compact heatsink design for 12 A continuous operation at ambient < 50 °C.

Applications

Lighting Control

Industrial Motor Control

Use Scenario: Dimming of incandescent/halogen lamps in commercial building automation systems.

IC Role / Device Role / Timing Role: Bidirectional AC switch controlling power delivery per half-cycle via phase-angle modulation.

Use Value: Enables smooth, flicker-free dimming with zero-crossing synchronization and 12 A RMS handling for multi-lamp circuits.

Use Scenario: Soft-start and speed regulation of single-phase induction motors in HVAC blowers and pumps.

IC Role / Device Role / Timing Role: Static AC switch replacing mechanical contactors; triggered by microcontroller-generated firing angle signals.

Use Value: Eliminates arcing and wear; 125 A surge rating accommodates 6× locked-rotor current during startup.

Heating Element Control

Power Supply Inrush Limiting

Use Scenario: Temperature-regulated resistive heating in industrial ovens and soldering stations.

IC Role / Device Role / Timing Role: Phase-controlled power regulator interfacing directly with thermistor feedback loop and MCU PWM output.

Use Value: Delivers precise thermal control with 700 V blocking margin for 400 VAC industrial mains and 12 A steady-state load capacity.

Use Scenario: Controlled turn-on of large capacitor banks in switched-mode power supplies to limit inrush current.

IC Role / Device Role / Timing Role: Delayed-conduction AC switch activated after zero-crossing detection to ramp input current gradually.

Use Value: Prevents fuse blowing and rectifier stress; 72 A²s I²t rating coordinates with 10 A slow-blow fuses for reliable protection.

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
BTB12-700CW	Uninsulated TO-220AB package; R_th(j-c) = 2.0 °C/W; no UL 2500 V_RMS isolation.	Requires external insulation barrier; suitable only where chassis ground is isolated from mains potential.	Select when thermal performance is prioritized over safety certification and board-level isolation is already implemented.
MAC12A7G	12 A RMS, 700 V, TO-220AB, non-insulated; I_GT = 50 mA (Quadrant C); lower dV/dt (≥5 V/µs).	Higher gate drive demand; reduced noise immunity in electrically noisy environments.	Choose only if existing gate driver can supply ≥50 mA and system EMI is tightly controlled.

Compared with BTB12-700CW and MAC12A7G, BTA12-700CWRG uniquely combines UL-recognized insulation, low gate drive (25 mA), and high commutation dV/dt (10 V/µs), making it optimal for safety-compliant, microcontroller-driven AC control where board space precludes external isolation.

Availability

BTA12-700CWRG is available at Aetrix Electronics and suitable for lighting control, industrial motor soft-start, resistive heating regulation, and inrush limiting requiring stable component supply across automotive aftermarket, industrial OEM, and appliance production programs.

Supply support for BTA12-700CWRG 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, MEMS, and microcontrollers.

BTA/BTB12 series belongs to ST's high-surge triac product line, engineered specifically for robust, cost-effective AC power control in industrial, appliance, and building automation systems demanding reliability under thermal and electrical stress.

FAQ

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

The datasheet specifies IT(RMS) = 12 A at Tc = 90 °C. Operation above this temperature requires linear derating: Fig.4 shows ~8.5 A at 110 °C case. Exceeding 90 °C without heatsink derating risks thermal runaway due to positive temperature coefficient of on-state voltage.

Is BTA12-700CWRG compatible with zero-crossing SSR drivers?

No - BTA12-700CWRG is a random-phase triac requiring phase-angle control timing. Zero-crossing drivers deliver gate pulses only near voltage zero crossings, which cannot achieve dimming or variable power control. Use only with phase-control drivers (e.g., MOC302x optocouplers with RC timing networks).

Does the "C" suffix indicate gate sensitivity, and how does it affect drive requirements?

Yes - "C" denotes Quadrant III gate sensitivity: I_GT ≤ 25 mA and V_GT ≤ 1.5 V at 25 °C. This allows direct drive from 3.3 V or 5 V microcontrollers via 220 Ω series resistor (5 V/220 Ω ≈ 23 mA), eliminating need for transistor buffers in most designs.

Can BTA12-700CWRG replace BTA12-600BWRG in a 230 VAC lighting circuit?

Yes - VDRM/VRRM is backward compatible: 700 V exceeds the 600 V rating, providing higher transient margin. All other parameters (IT(RMS), I_GT, dV/dt, package) are identical. No circuit redesign is needed; improved voltage headroom enhances reliability against line surges.

BTA12-700CWRG 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):: 35 mA

Current - Hold (Ih) (Max):: 35 mA

Configuration:: Single

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BTA12-700CWRG FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your BTA12-700CWRG 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 BTA12-700CWRG?

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

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

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

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

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

Return procedure for BTA12-700CWRG:

1.Submit a request within 90 days.

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

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