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STMicroelectronics BTA08-700CWRG
- Part No.:
- BTA08-700CWRG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
BTA08-700CWRG.pdf
- Description:
- TRIAC ALTERNISTOR 700V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:8,932
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Product details
Overview
BTA08-700CWRG from STMicroelectronics is a snubberless, standard-sensitivity 8 A, 700 V triac in insulated TO-220AB package, rated for 50 mA gate trigger current (IGT), 1.55 V on-state voltage (VTM), and 1.6 °C/W junction-to-case thermal resistance. It enables robust AC switching in motor speed control, heating regulation, and static relay circuits with high commutation performance on inductive loads.
For engineers reviewing the BTA08-700CWRG datasheet, BTA08-700CWRG pinout, BTA08-700CWRG application, or BTA08-700CWRG equivalent, this page delivers verified triac specifications, thermal derating curves, snubberless commutation behavior, gate drive compatibility with microcontrollers, and real-world use cases in phase-controlled AC power systems.
Technical Context
This triac operates in three quadrants (I, II, III) with standard 4-quadrant triggering capability, supporting both leading- and trailing-edge phase control. Its snubberless design achieves 400 V/µs critical dV/dt immunity at 125 °C and 5.4 A/ms critical dl/dt without external snubbers.
The device integrates an internal ceramic insulating pad rated at 2500 VRMS per UL E81734, enabling direct mounting to heatsinks without isolation hardware. Thermal performance is defined by Rth(j–c) = 1.6 °C/W (TO-220AB insulated) and IT(RMS) = 8 A at Tc = 100 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current - supports continuous 1 kW resistive load at 120 VAC or 1.7 kW at 230 VAC with proper heatsinking |
| VDRM / VRRM | 700 V repetitive peak off-state voltage - ensures reliable blocking across 230 VAC mains with 2.5× safety margin |
| IGT | 35 mA max gate trigger current - compatible with standard GPIO outputs and low-power drivers without buffer stages |
| VTM | 1.55 V max on-state voltage at 11 A - limits conduction loss to ≤17 W at full RMS current, reducing thermal stress |
| dV/dt | 400 V/µs min critical rate of rise - prevents false triggering during fast transients in inductive motor circuits |
| Rth(j–c) | 1.6 °C/W junction-to-case - enables 8 A operation at 100 °C case temperature with ≤12.8 °C junction rise above heatsink |
| Isolation rating | 2500 VRMS insulated tab - eliminates need for mica washers or isolation kits in industrial mounting |
Pinout & Package
Package: TO-220AB Insulated - thermally conductive but electrically isolated metal tab, 3-pin through-hole mount, 0.55 N·m recommended torque, ECOPACK2 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; connects to neutral or low-side AC line in phase-control topologies |
| A2 (MT2) | Main Terminal 2 | High-current AC path output; carries full load current to load; polarity defines quadrant conduction |
| G | Gate | Low-energy trigger input; requires ≥35 mA pulse to initiate conduction in Quadrants I, II, III; referenced to A1 |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless commutation | Guaranteed 400 V/µs dV/dt and 5.4 A/ms dl/dt at 125 °C - eliminates snubber networks in motor starter and dimmer designs |
| UL-rated insulation | 2500 VRMS reinforced isolation between tab and terminals - meets IEC/EN 60730 safety requirements for Class I appliances |
| Standard sensitivity | 35 mA max IGT - interfaces directly with 3.3 V/5 V microcontroller GPIOs using minimal RC gate network |
| Thermal efficiency | 1.6 °C/W Rth(j–c) - allows 8 A RMS operation with compact heatsink (e.g., 10 cm² aluminum finned base) |
| Lead-free & halogen-free | ECOPACK2-compliant molding compound and plating - satisfies RoHS, REACH, and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Motor Speed Control | Heating Regulation |
|---|---|
|
Use Scenario: Variable-speed control of single-phase induction motors in fans, pumps, and compressors using phase-angle firing. IC Role / Device Role / Timing Role: Main AC power switch triggered by zero-crossing synchronized PWM pulses to modulate RMS voltage delivered to motor windings. Use Value: Enables smooth torque control without mechanical wear; snubberless operation prevents gate misfire during motor back-EMF spikes. |
Use Scenario: Precise temperature maintenance in electric ovens, soldering irons, and HVAC duct heaters via duty-cycled AC power. IC Role / Device Role / Timing Role: High-reliability ON/OFF switching element in SSR-like configuration, driven by PID controller output. Use Value: 8 A rating supports up to 1.8 kW heating elements; insulated tab simplifies PCB-to-heatsink thermal interface in compact enclosures. |
| Static Relay | Light Dimmer |
|
Use Scenario: Solid-state replacement for electromechanical relays in industrial PLC output modules and home automation hubs. IC Role / Device Role / Timing Role: Bidirectional AC switch activated by logic-level control signal; handles inrush currents up to 80 A surge. Use Value: 80 A non-repetitive surge rating withstands lamp/capacitor inrush; 2500 VRMS isolation eliminates creepage distance concerns on PCB. |
Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential and commercial lighting systems. IC Role / Device Role / Timing Role: Phase-controlled AC switch triggered after zero-crossing to adjust conduction angle and lamp brightness. Use Value: 700 V blocking voltage accommodates 230 VAC mains with transient margin; low IGT ensures stable triggering across wide temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTA08-600CWRG | 600 V VDRM instead of 700 V; identical IGT (35 mA), package, and snubberless rating | Suitable only for 120 VAC or well-filtered 230 VAC systems; lower transient margin than BTA08-700CWRG | Select when cost optimization is prioritized and peak line voltage remains below 600 V |
| BTB08-700CWRG | Non-insulated TO-220AB package; same electrical specs but no 2500 VRMS tab isolation | Requires external isolation (mica washer + silicone grease) for safe heatsink mounting in Class I equipment | Choose where board-level isolation is already implemented and thermal coupling efficiency is critical |
Compared with BTA08-600CWRG, the 700 V rating provides 16% higher transient immunity for 230 VAC deployments; versus BTB08-700CWRG, the insulated tab reduces BOM count and assembly steps in safety-certified products.
Availability
BTA08-700CWRG is available at Aetrix Electronics and suitable for motor speed control, heating regulation, static relay implementation, and light dimmer designs requiring stable component supply, long-lifecycle support, and UL-compliant isolation.
Supply support for BTA08-700CWRG 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
BTA08-700CWRG belongs to ST's Snubberless Triac family, engineered specifically for reliable, snubber-free AC switching in inductive and resistive loads across appliance, building automation, and industrial control applications.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The BTA08-700CWRG has an operating junction temperature range of –40 °C to +125 °C. For continuous 8 A RMS operation, the case temperature must be maintained at ≤100 °C per absolute maximum ratings table, requiring adequate heatsinking to limit thermal resistance from junction to ambient.
Does this triac require a heat sink in all applications?
Yes - even with its 1.6 °C/W junction-to-case thermal resistance, dissipating up to 12.8 W at full 8 A RMS (based on VTM and RD) necessitates a heatsink. Derating curves show RMS current drops to ~3.5 A at 75 °C ambient with no heatsink, confirming mandatory thermal management for rated performance.
Can BTA08-700CWRG replace a standard 4-quadrant triac in existing designs?
Yes - it supports full 4-quadrant triggering (I, II, III, IV) per Table 3, with IGT ≤50 mA and dV/dt ≥200 V/µs. Its snubberless rating adds robustness, but gate drive timing and snubber removal must be validated per load type and transient profile.
What is the significance of the "W" and "R" suffixes in BTA08-700CWRG?
"W" denotes snubberless version (enhanced commutation); "R" indicates tape-and-reel packaging (though "RG" in this part number specifies tube packaging per ST's ordering scheme). The "C" signifies standard 35 mA gate sensitivity, and "700" is the 700 V VDRM rating.
BTA08-700CWRG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 700 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):
- 35 mA
- Current - Hold (Ih) (Max):
- 15 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BTA08-700CWRG FAQ
1.How can I place an order for BTA08-700CWRG through Aetrix?
Please submit a Request for Quotation (RFQ) for BTA08-700CWRG 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 BTA08-700CWRG reliable?
The price and inventory of BTA08-700CWRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA08-700CWRG is usually 5 days.
3.What payment methods are accepted for BTA08-700CWRG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA08-700CWRG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTA08-700CWRG?
BTA08-700CWRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTA08-700CWRG 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 BTA08-700CWRG?
For technical support, including BTA08-700CWRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA08-700CWRG requirements.
6.How does Aetrix verify that BTA08-700CWRG is sourced from the original manufacturer or authorized distributors?
All BTA08-700CWRG 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 BTA08-700CWRG meets industry standards.
7.What is the process for return or replacement of BTA08-700CWRG?
All BTA08-700CWRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA08-700CWRG, 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 BTA08-700CWRG part is unused and in its original packaging.
Return procedure for BTA08-700CWRG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BTA08-700CWRG Tags
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Z0103NN5AA4
STMicroelectronics
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