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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics BTA41-700BRG

Name: BTA41-700BRG
Brand: STMicroelectronics
SKU: BTA41-700BRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BTA41-700BRG

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TOP-3 Insulated

Datasheet:: BTA41-700BRG.pdf

Description:: TRIAC 700V 40A TOP3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BTA41-700BRG from STMicroelectronics is a 40 A, 700 V RMS insulated triac in TOP3 package, rated for 2500 V_rms isolation between main terminals and heatsink. It supports phase control and on/off AC switching up to 9 kW with proper heatsinking, and is UL 1557 recognized (file ref: 81734) for safety-critical static relays and motor control.

For engineers reviewing the BTA41-700BRG datasheet, BTA41-700BRG pinout, BTA41-700BRG application, or BTA41-700BRG equivalent, key selection criteria include its 50 mA gate trigger current (I_GT), 0.9 °C/W junction-to-case thermal resistance, 50 A/µs critical dI/dt, 500 V/µs off-state dV/dt immunity, and insulated TOP3 mechanical form factor.

Technical Context

The BTA41-700BRG is a four-quadrant sensitive-gate triac designed for bidirectional AC line switching without external snubbers in many standard configurations. Its gate trigger threshold (V_GT ≤ 1.3 V) and low latching current (I_L ≤ 70 mA) enable reliable firing with microcontroller-level drive signals.

Thermal performance is defined by R_th(j–c) = 0.9 °C/W and maximum junction temperature of +125 °C, supporting continuous 40 A RMS conduction at T_c = 80 °C. The device sustains 420 A non-repetitive surge (16.7 ms) and exhibits ≥500 V/µs dV/dt immunity at 125 °C with open gate.

Key Specifications

Parameter	Value and Actual Design Meaning
I_T(RMS)	40 A - Sustains full-cycle AC load current up to 9 kW at 230 VAC with heatsink
V_DRM/V_RRM	700 V - Blocks peak line voltages up to 495 VAC RMS with 1.4× safety margin
I_GT	50 mA max - Compatible with standard logic-level gate drivers (e.g., MOC302x optocouplers)
R_th(j–c)	0.9 °C/W - Enables efficient thermal transfer to heatsink; limits junction rise to ≤36 °C at 40 A
dV/dt (min)	500 V/µs - Resists false triggering from line transients without snubber network
V_TM	1.55 V max @ 60 A - Low conduction loss reduces power dissipation and heatsink size
Isolation rating	2500 V_rms - Meets reinforced insulation requirements for industrial mains-connected equipment

Pinout & Package

Package: TOP3 insulated - epoxy body meeting UL94 V0, lead-free, with insulated tab rated 2500 V_rms. Mounting torque: 1.05 N·m (max 1.2 N·m). Dimensions: 20.4–21.1 mm (L) × 15.1–15.5 mm (W) × 4.4–4.6 mm (H).

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main terminal 1	Reference terminal for gate trigger; connected to neutral or low-side AC path in most phase-control layouts
A2 (MT2)	Main terminal 2	High-side AC line connection; carries full load current and defines voltage reference polarity for gate
G	Gate	Sensitive control input; triggers conduction in all four quadrants with ≤50 mA pulse

Key Features

Feature	Design Value
UL 1557 recognition	File ref 81734 - Validated isolation and failure-mode safety for industrial AC control systems
Insulated tab	2500 V_rms - Eliminates need for insulating hardware when mounting to grounded heatsinks
Low thermal resistance	0.9 °C/W - Reduces required heatsink volume by ~30% vs. non-insulated equivalents at same current
High dV/dt immunity	≥500 V/µs at 125 °C - Prevents spurious turn-on during EMI-rich motor or relay switching events
Four-quadrant operation	Triggers with either polarity of A2 relative to A1 - Simplifies driver design; no polarity sensing needed

Applications

Static Relay Control

Heating Regulation

Use Scenario: Solid-state replacement for electromechanical contactors in HVAC zone controllers and industrial PLC output modules.

IC Role / Device Role / Timing Role: Main AC power switch; conducts full 50/60 Hz sine wave under microcontroller PWM or zero-crossing logic control.

Use Value: 40 A RMS rating and 2500 V_rms isolation ensure long-term reliability in 230 VAC/400 VAC distribution panels without auxiliary isolation.

Use Scenario: Proportional power delivery to resistive heating elements in ovens, soldering stations, and plastic extruders.

IC Role / Device Role / Timing Role: Phase-angle controlled switch; modulates conduction angle per half-cycle to regulate average power.

Use Value: 50 mA I_GT and 1.3 V V_GT allow direct drive from MCU GPIO via compact optocoupler (e.g., MOC3041), minimizing BOM count.

Induction Motor Starting

Light Dimming

Use Scenario: Soft-start circuit for single-phase induction motors in pumps, compressors, and fans to limit inrush current.

IC Role / Device Role / Timing Role: Bidirectional AC switch enabling gradual voltage ramp-up across motor windings using phase-controlled gating.

Use Value: 420 A non-repetitive surge rating handles locked-rotor currents; 50 A/µs dI/dt rating prevents commutation failure during startup transients.

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

IC Role / Device Role / Timing Role: Line-synchronized AC switch triggered after adjustable delay from zero-crossing point.

Use Value: 700 V blocking voltage accommodates 230 VAC mains with margin for line surges; low V_TM minimizes audible transformer hum and heat generation.

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
BTA41-600BRG	600 V V_DRM, identical package, I_GT, and thermal specs	Lower voltage margin; suitable only for 120 VAC or well-regulated 230 VAC systems	Select when system peak line voltage stays below 424 V and cost optimization is prioritized
BTB41-700BRG	Non-insulated TOP3 package; same electrical ratings but no 2500 V_rms tab isolation	Requires insulating washer/mica pad when mounted to conductive heatsink	Choose where board-level isolation already exists or heatsink is electrically isolated

Compared with BTA41-600BRG, the -700BRG adds 100 V blocking headroom for robustness in fluctuating mains; versus BTB41-700BRG, it eliminates mechanical isolation components and simplifies thermal design at the cost of slightly higher unit price.

Availability

BTA41-700BRG is available at Aetrix Electronics and suitable for static relay control, heating regulation, induction motor starting circuits, and light dimming requiring stable component supply across industrial OEM and embedded design cycles.

Supply support for BTA41-700BRG 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The BTA41 series belongs to ST's high-power discrete triac product line, engineered specifically for robust, isolated AC mains switching in safety-critical industrial controls and energy management systems.

FAQ

What is the maximum continuous case temperature for BTA41-700BRG at 40 A RMS?

The datasheet specifies 40 A RMS conduction at T_c = 80 °C for BTA41-700BRG. Exceeding this requires derating per Figure 2; at T_c = 90 °C, maximum sustainable current drops to ~35 A RMS due to thermal saturation of the 0.9 °C/W junction-to-case path.

Does BTA41-700BRG require a heatsink in all applications?

Yes - even at partial load, thermal management is mandatory. At 40 A RMS, power dissipation exceeds 60 W (based on V_TM ≈ 1.5 V). Without a heatsink, junction temperature would exceed 125 °C within seconds. ST AN533 provides validated heatsink sizing guidelines for TOP3 packages.

Can BTA41-700BRG be driven directly by a microcontroller GPIO pin?

No - GPIO pins cannot safely source the 50 mA peak gate current required. A driver stage (e.g., MOC3023 optocoupler or discrete transistor buffer) is mandatory to isolate and amplify the control signal while protecting the MCU from mains-referenced transients and voltage spikes.

How does the insulated tab affect PCB layout and mechanical mounting?

The insulated tab allows direct bolting to a grounded metal chassis or heatsink without additional insulators. PCB layout must maintain ≥2.5 mm creepage/clearance from A1/A2 pads to any low-voltage copper, and mounting screw torque must stay within 1.05–1.2 N·m to avoid cracking the epoxy package or compromising isolation integrity.

BTA41-700BRG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TOP-3 Insulated

Packaging:: Tube

Product Status:: Active

Triac Type:: Standard

Voltage - Off State:: 700 V

Current - On State (It (RMS)) (Max):: 40 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 400A, 420A

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

Current - Hold (Ih) (Max):: 80 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TOP3

BTA41-700BRG FAQ

1.How can I place an order for BTA41-700BRG through Aetrix?

Please submit a Request for Quotation (RFQ) for BTA41-700BRG 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 BTA41-700BRG reliable?

The price and inventory of BTA41-700BRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA41-700BRG is usually 5 days.

3.What payment methods are accepted for BTA41-700BRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA41-700BRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BTA41-700BRG?

BTA41-700BRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BTA41-700BRG 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 BTA41-700BRG?

For technical support, including BTA41-700BRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA41-700BRG requirements.

6.How does Aetrix verify that BTA41-700BRG is sourced from the original manufacturer or authorized distributors?

All BTA41-700BRG 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 BTA41-700BRG meets industry standards.

7.What is the process for return or replacement of BTA41-700BRG?

All BTA41-700BRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA41-700BRG, 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 BTA41-700BRG part is unused and in its original packaging.

Return procedure for BTA41-700BRG:

1.Submit a request within 90 days.

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

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