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STMicroelectronics BTA08-800BWRG
- Part No.:
- BTA08-800BWRG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
BTA08-800BWRG.pdf
- Description:
- TRIAC ALTERNISTOR 800V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
BTA08-800BWRG from STMicroelectronics is a snubberless, logic-level triac rated for 8 A RMS on-state current and 800 V repetitive peak off-state voltage (VDRM/VRRM), designed for AC switching in inductive load circuits. It features 5 mA maximum gate trigger current (IGT), 1.2 V maximum gate trigger voltage (VGT), and 2500 VRMS insulated tab compliance with UL E81734. Used in motor speed controllers and light dimmers requiring high commutation robustness.
For engineers reviewing the BTA08-800BWRG datasheet, BTA08-800BWRG pinout, BTA08-800BWRG application, or BTA08-800BWRG equivalent, this page delivers verified electrical specs, thermal resistance values, gate sensitivity thresholds, insulation rating details, and real-world use cases for inductive AC control without snubber networks.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation capability, enabling reliable turn-off under inductive loads without external RC snubbers. Its critical rate of rise of off-state voltage (dV/dt) is rated at 400 V/µs minimum at Tj = 125 °C, and critical rate of decrease of main current (dl/dt)c exceeds 4.5 A/ms at (dV/dt)c = 0.1 V/µs.
The device integrates an internal ceramic pad for voltage-isolated mounting, delivering 2500 VRMS isolation between tab and terminals. Thermal resistance junction-to-case is 2.5 °C/W for the TO-220AB insulated package, supporting stable operation up to 125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS - supports continuous AC load current up to 8 A at Tc = 100 °C in insulated TO-220AB package. |
| VDRM / VRRM | 800 V - blocks up to 800 V peak reverse or forward voltage, suitable for 230 VAC mains with safety margin. |
| IGT (max) | 5 mA - enables direct drive from low-power microcontrollers without gate amplification. |
| dV/dt (min) | 400 V/µs - ensures immunity to false triggering during fast voltage transients in inductive switching. |
| Rth(j-c) | 2.5 °C/W - defines thermal path efficiency from junction to case; requires heatsink for >3 W dissipation. |
| VGT (max) | 1.2 V - guarantees gate turn-on with ≤1.2 V applied, compatible with 3.3 V or 5 V logic outputs. |
| VTM (max) | 1.55 V @ 11 A - limits conduction loss and self-heating during full-load operation. |
| Isolation Rating | 2500 VRMS - permits safe mounting on grounded heatsinks per UL E81734 certification. |
Pinout & Package
Package: TO-220AB Insulated - thermally conductive but electrically isolated tab; mounting screw torque: 0.55 N·m (max 0.70 N·m).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main Terminal 1 (MT1) | Reference terminal for gate triggering; connected to neutral or return path in AC phase control. |
| A2 | Main Terminal 2 (MT2) | High-side AC line connection; carries full load current and determines polarity-sensitive triggering behavior. |
| G | Gate | Low-current control input; triggers conduction when IGT ≥ 5 mA with proper polarity relative to A1. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless commutation | Rated for inductive loads without external snubber networks due to guaranteed (dl/dt)c ≥ 4.5 A/ms at 0.1 V/µs dV/dt. |
| Logic-level gate drive | IGT ≤ 5 mA and VGT ≤ 1.2 V enable direct interface with 3.3 V/5 V MCUs, eliminating buffer stages. |
| UL-certified isolation | 2500 VRMS reinforced insulation allows safe mounting on grounded metal heatsinks per UL file E81734. |
| High dV/dt immunity | 400 V/µs minimum off-state dV/dt prevents false triggering in noisy industrial AC environments. |
| Three-quadrant operation | Operates in quadrants I, II, and III only - eliminates quadrant IV leakage and improves reliability in phase-control topologies. |
Applications
| Motor Speed Control | Light Dimming |
|---|---|
|
Use Scenario: Variable-speed control of single-phase induction motors in fans, pumps, and compressors. IC Role / Device Role / Timing Role: AC line switch that modulates power via phase-angle control synchronized to zero-crossing detection. Use Value: Eliminates need for snubber components while maintaining clean turn-off under high-inductance motor back-EMF. |
Use Scenario: Mains-powered residential and commercial lighting dimmers using leading-edge phase-cut topology. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by microcontroller-generated gate pulses aligned to AC half-cycles. Use Value: 5 mA IGT enables direct MCU drive; 400 V/µs dV/dt immunity prevents flicker from line noise or lamp filament transients. |
| Heating Regulation | Static Relay Replacement |
|
Use Scenario: Solid-state temperature control in electric ovens, soldering irons, and HVAC heating elements. IC Role / Device Role / Timing Role: ON/OFF power switch implementing burst-fire or phase-control regulation based on PID feedback. Use Value: 8 A IT(RMS) and 800 V VDRM support resistive loads up to ~1.8 kW at 230 VAC with margin. |
Use Scenario: Replacement of electromechanical relays in PLC output modules and industrial control panels. IC Role / Device Role / Timing Role: Zero-voltage-switched AC output stage providing silent, bounce-free, long-life switching. Use Value: 2500 VRMS isolation allows direct mounting to chassis ground, simplifying PCB layout and safety certification. |
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 |
|---|---|---|---|
| BTA08-600BW | Same package and logic-level specs, but rated for 600 V VDRM instead of 800 V. | Suitable only for 120 VAC or 230 VAC with reduced surge margin; not recommended for 400 VAC industrial systems. | Select when cost optimization is prioritized and peak line voltage remains ≤670 V. |
| T835-800H | IPAK package (Rth(j-a) = 70 °C/W), 35 mA IGT, 400 V/µs dV/dt, no isolation. | Requires external gate driver and isolated heatsink mounting; higher gate drive power needed. | Choose for space-constrained SMT designs where board-level isolation is managed separately. |
Compared with BTA08-600BW, the BTA08-800BWRG provides higher voltage margin for global mains compatibility; versus T835-800H, it offers integrated isolation and lower gate drive burden at the cost of through-hole assembly.
Availability
BTA08-800BWRG is available at Aetrix Electronics and suitable for motor speed control, light dimming, heating regulation, and static relay replacement requiring stable component supply across industrial OEM and embedded design cycles.
Supply support for BTA08-800BWRG 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, designing and manufacturing analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The BTA series belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power control in inductive and resistive loads without external protection components.
FAQ
What is the maximum junction temperature for continuous operation?
The BTA08-800BWRG has a specified operating junction temperature range of –40 °C to +125 °C. Continuous operation must maintain Tj ≤ 125 °C, which requires thermal design ensuring Rth(j-c) × Pd + Tc ≤ 125 °C, where Pd is power dissipation and Tc is case temperature measured at the tab.
Can this triac be used with 120 VAC systems?
Yes - the 800 V VDRM rating provides ample margin for 120 VAC (peak ≈ 170 V) and transient surges. Its 5 mA IGT and 1.2 V VGT ensure compatibility with standard microcontroller GPIOs, and snubberless operation simplifies design even with highly inductive 120 VAC loads like universal motors.
Does the insulated tab require thermal compound when mounted to a heatsink?
Yes - although the tab is electrically isolated, thermal interface material (e.g., silicone grease or phase-change pad) is required to minimize Rth(j-hs) between the insulated tab and heatsink surface. Mechanical mounting torque must stay within 0.55 N·m (recommended) and 0.70 N·m (absolute max) to avoid cracking the insulation layer.
How does the three-quadrant operation affect circuit design?
Three-quadrant operation (quadrants I, II, III only) eliminates quadrant IV conduction, reducing gate-trigger leakage and improving noise immunity in phase-control circuits. Designers must ensure gate drive polarity respects A1 reference - triggering occurs only when G is positive relative to A1 in quadrants I and III, or negative in quadrant II.
BTA08-800BWRG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 80A, 84A
- 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
BTA08-800BWRG FAQ
1.How can I place an order for BTA08-800BWRG through Aetrix?
Please submit a Request for Quotation (RFQ) for BTA08-800BWRG 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 BTA08-800BWRG reliable?
The price and inventory of BTA08-800BWRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA08-800BWRG is usually 5 days.
3.What payment methods are accepted for BTA08-800BWRG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA08-800BWRG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTA08-800BWRG?
BTA08-800BWRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTA08-800BWRG 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 BTA08-800BWRG?
For technical support, including BTA08-800BWRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA08-800BWRG requirements.
6.How does Aetrix verify that BTA08-800BWRG is sourced from the original manufacturer or authorized distributors?
All BTA08-800BWRG 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 BTA08-800BWRG meets industry standards.
7.What is the process for return or replacement of BTA08-800BWRG?
All BTA08-800BWRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA08-800BWRG, 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 BTA08-800BWRG part is unused and in its original packaging.
Return procedure for BTA08-800BWRG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BTA08-800BWRG Tags
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