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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics BTA20-700CWRG

Name: BTA20-700CWRG
Brand: STMicroelectronics
SKU: BTA20-700CWRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BTA20-700CWRG

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: BTA20-700CWRG.pdf

Description:: TRIAC ALTERNISTOR 700V 20A TO220

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Product details

Overview

BTA20-700CWRG from STMicroelectronics is a 20 A, 700 V snubberless triac in insulated TO-220AB package, rated for 35 mA maximum gate trigger current (Q1 quadrant), designed for phase-controlled AC power switching in inductive and resistive loads such as motor speed controllers and solid-state relays.

For engineers reviewing the BTA20-700CWRG datasheet, BTA20-700CWRG pinout, BTA20-700CWRG application, or BTA20-700CWRG equivalent, key selection criteria include dV/dt immunity (min. 500 V/µs at 125 °C), I²t rating (200 A²s), insulated tab (2500 V_rms), surge current capability (200 A @ 60 Hz), and thermal resistance (R_th(j-c) = 2.1 °C/W AC).

Technical Context

This triac employs glass-passivated silicon die with internal ceramic insulation to achieve reinforced isolation between MT2 and case. Its snubberless architecture eliminates external RC snubbers by sustaining high dV/dt (500–750 V/µs) and dI/dt (50–100 A/µs) without false triggering under inductive load transients.

It operates across –40 °C to +125 °C junction temperature, supports full-cycle conduction with 20 A RMS current at T_c = 70 °C, and features symmetrical triggering in all four quadrants-though Q1/Q3 are optimized for low I_GT (35 mA max) and stable turn-on.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	20 A RMS - supports continuous 2.4 kW AC load at 120 V with adequate heatsinking
VDRM / VRRM	700 V - enables use in 240 VAC mains systems with 2× safety margin
IGT (Q1)	35 mA max - ensures reliable triggering with standard microcontroller GPIO or optocoupler drivers
dV/dt (min)	500 V/µs at 125 °C - suppresses false turn-on during inductive load commutation
I²t (fusing)	200 A²s - defines single-pulse short-circuit withstand capability for fuse coordination
Rth(j-c)	2.1 °C/W (AC) - determines minimum heatsink size required to maintain Tj ≤ 125 °C at full load
V_TM	1.70 V max at 28 A - sets conduction loss (≈48 W peak) and thermal design baseline

Pinout & Package

Insulated TO-220AB package with voltage-isolated metal tab (2500 V_rms UL-rated), clip-assembled construction for enhanced surge robustness and thermal cycling reliability.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate drive; connected to load return in most phase-control topologies
A2 (MT2)	Main Terminal 2	High-side AC line connection; electrically isolated from case by internal ceramic pad
G	Gate	Trigger input; requires ≥2 mA DC or pulse current to initiate conduction in any quadrant

Key Features

Feature	Design Value
Snubberless operation	Eliminates external RC network-reduces BOM count and PCB area in AC dimmers and motor controls
Insulated tab	2500 V_rms isolation enables direct mounting to grounded heatsinks without insulating hardware
High surge immunity	200 A non-repetitive surge (60 Hz, 8.3 ms) supports motor startup and transformer inrush tolerance
Low I_GT (Q1)	35 mA max ensures compatibility with low-power gate drivers including MOC302x optocouplers
Wide operating temperature	–40 °C to +125 °C junction range supports industrial and outdoor-rated equipment deployment

Applications

AC Motor Speed Control

Industrial Solid-State Relay

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

IC Role / Device Role / Timing Role: Main AC power switch enabling phase-angle control via zero-crossing synchronized gate pulses.

Use Value: Delivers smooth torque regulation without snubber losses; insulated tab simplifies thermal management on shared chassis ground.

Use Scenario: Replacement for electromechanical relays in PLC output modules and machine safety interlocks.

IC Role / Device Role / Timing Role: Bidirectional AC switching element triggered by isolated logic-level signals.

Use Value: Enables >10⁶ operations lifetime, silent operation, and immunity to contact bounce-critical for high-cycle automation systems.

Resistive Load Dimming

Heating Element Control

Use Scenario: Leading-edge dimming of incandescent and halogen lamps in architectural lighting systems.

IC Role / Device Role / Timing Role: Phase-controlled AC switch synchronized to line voltage zero crossings.

Use Value: Achieves flicker-free dimming down to 5% brightness with minimal EMI due to snubberless dV/dt immunity.

Use Scenario: Precise ON/OFF cycling of resistive heating elements in commercial ovens and soldering stations.

IC Role / Device Role / Timing Role: High-reliability AC power switch controlled by PID output or timer-based duty cycle.

Use Value: Withstands repeated thermal cycling and inrush currents up to 200 A, ensuring long-term stability in thermal cycling environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTA20-700BWRG	Higher I_GT (50 mA max) in Q1; otherwise identical voltage/current ratings	Requires stronger gate drive; less suitable for low-power optocouplers	Select when gate driver has ≥50 mA sourcing capability and cost sensitivity outweighs drive simplicity
BTB20-700CW	Non-insulated TO-220AB package; same electrical specs except tab isolation (0 V_rms)	Requires insulating washer and shoulder washer for safe mounting; lower assembly cost	Select when mechanical isolation is handled externally and board space/cost optimization is prioritized

Compared with BTA20-700BWRG and BTB20-700CW, the BTA20-700CWRG uniquely balances low gate drive demand (35 mA) with reinforced isolation (2500 V_rms), making it optimal for compact, safety-certified designs where gate drive headroom and mounting simplicity are both critical.

Availability

BTA20-700CWRG is available at Aetrix Electronics and suitable for AC motor speed control, industrial solid-state relays, resistive load dimming, and heating element control requiring stable component supply and long-lifecycle support.

Supply support for BTA20-700CWRG 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 for industrial, automotive, and consumer markets.

The BTA series targets robust AC power control applications, emphasizing snubberless reliability, high surge tolerance, and reinforced insulation for safety-critical mains-connected equipment.

FAQ

What is the maximum allowable case temperature for continuous 20 A RMS operation?

The datasheet specifies IT(RMS) = 20 A at Tc = 70 °C. Exceeding this case temperature reduces allowable current per Figure 3; sustained operation above 70 °C requires derating to prevent junction overheating beyond 125 °C, using Rth(j-c) = 2.1 °C/W (AC) for thermal calculation.

Does the insulated tab require additional isolation hardware when mounted to a heatsink?

No. The internal ceramic pad provides 2500 V_rms isolation between A2 (MT2) and the metal tab, allowing direct mounting to grounded heatsinks without mica washers or insulating sleeves-verified per UL File E81734.

Can BTA20-700CWRG be used in zero-crossing switched applications?

Yes-it supports all four quadrants and is commonly paired with zero-crossing optotriacs (e.g., MOC3041) for noise-sensitive applications; however, its snubberless design also enables leading-edge phase control where precise timing is required.

What is the recommended gate resistor value for driving with a 5 V MCU GPIO?

With I_GT ≤ 35 mA and V_GM = 16 V max, a 150 Ω series resistor limits peak gate current to ~33 mA when driven from 5 V through an optocoupler (e.g., MOC3023), ensuring reliable turn-on while protecting the driver and gate junction.

BTA20-700CWRG 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):: 20 A

Voltage - Gate Trigger (Vgt) (Max):: 1.5 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 210A, 200A

Current - Gate Trigger (Igt) (Max):: 35 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

BTA20-700CWRG FAQ

1.How can I place an order for BTA20-700CWRG through Aetrix?

Please submit a Request for Quotation (RFQ) for BTA20-700CWRG 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 BTA20-700CWRG reliable?

The price and inventory of BTA20-700CWRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA20-700CWRG is usually 5 days.

3.What payment methods are accepted for BTA20-700CWRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA20-700CWRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BTA20-700CWRG?

BTA20-700CWRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BTA20-700CWRG 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 BTA20-700CWRG?

For technical support, including BTA20-700CWRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA20-700CWRG requirements.

6.How does Aetrix verify that BTA20-700CWRG is sourced from the original manufacturer or authorized distributors?

All BTA20-700CWRG 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 BTA20-700CWRG meets industry standards.

7.What is the process for return or replacement of BTA20-700CWRG?

All BTA20-700CWRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA20-700CWRG, 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 BTA20-700CWRG part is unused and in its original packaging.

Return procedure for BTA20-700CWRG:

1.Submit a request within 90 days.

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

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