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STMicroelectronics BTA08-800CRG
- Part No.:
- BTA08-800CRG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
BTA08-800CRG.pdf
- Description:
- TRIAC 800V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:517
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Product details
Overview
BTA08-800CRG from STMicroelectronics is an insulated TO-220AB-packaged 8 A, 800 V snubberless triac optimized for inductive AC load switching. It features 50 mA maximum gate trigger current (IGT), 1.55 V max on-state voltage (VTM) at 11 A, and 4.5 A/ms minimum commutation di/dt without snubber at 125 °C. It is used in motor speed controllers and heating regulation circuits requiring robust turn-off under reactive loads.
For engineers reviewing the BTA08-800CRG datasheet, BTA08-800CRG pinout, BTA08-800CRG application, or BTA08-800CRG equivalent, this page delivers verified electrical specs, thermal resistance data (Rth(j-c) = 2.5 °C/W), package footprint details, real-world triac role in phase control, and validated alternatives for snubberless 8 A/800 V AC switching.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation capability, enabling reliable zero-crossing and phase-angle control in inductive environments. Its 800 V repetitive peak off-state voltage (VDRM/VRRM) and 80 A non-repetitive surge rating (ITSM) support mains-connected industrial equipment.
It integrates a ceramic-insulated tab rated at 2500 VRMS per UL E81734, and its gate threshold (VGT ≤ 1.2 V) and low IGT (≤ 50 mA) allow direct drive from microcontrollers without external amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current - supports continuous 1 kW resistive or 750 W inductive load at Tc = 100 °C |
| VDRM / VRRM | 800 V repetitive peak off-state voltage - withstands 230 VAC + 15% line surge with margin |
| IGT (max) | 50 mA gate trigger current - compatible with 3.3 V/5 V MCU GPIO without buffer stage |
| VTM (max) | 1.55 V on-state voltage at 11 A - limits conduction loss to ≤17 W at full RMS current |
| Rth(j-c) | 2.5 °C/W junction-to-case thermal resistance - requires ≥10 cm² copper area for 8 A operation at 125 °C junction |
| (dl/dt)c (min) | 4.5 A/ms critical rate of decrease of on-state current without snubber - sustains turn-off in 230 VAC motor windings |
| dV/dt (min) | 200 V/µs off-state dv/dt immunity - prevents false triggering during fast transients in relay replacement |
Pinout & Package
Package: TO-220AB Insulated - thermally conductive but electrically isolated tab (2500 VRMS isolation), screw-mountable, 0.55 N·m recommended torque.
| 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 topology |
| A2 (MT2) | Main Terminal 2 | High-current AC path output; ties to load and line hot; polarity defines quadrant conduction |
| G | Gate | Low-power control input; triggers conduction when referenced to A1; 50 mA max IGT enables direct MCU drive |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless commutation | Guaranteed 4.5 A/ms (dl/dt)c without external RC network - reduces BOM count and PCB space in motor starters |
| UL-certified insulation | 2500 VRMS tab isolation (UL file E81734) - eliminates need for additional creepage/clearance barriers in safety-critical appliances |
| Logic-level gate drive | VGT ≤ 1.2 V and IGT ≤ 50 mA - interfaces directly with STM32, ESP32, or PIC GPIO pins without level-shifting |
| High dV/dt immunity | 200 V/µs min off-state dv/dt - suppresses false turn-on in noisy industrial environments with contactor switching |
| ECOPACK2 compliance | Halogen-free epoxy, lead-free plating - meets RoHS/REACH requirements for global appliance manufacturing |
Applications
| Motor Speed Control | Heating Regulation |
|---|---|
|
Use Scenario: Variable-speed fan or pump driven from 230 VAC single-phase supply with microcontroller-based phase-angle dimming. IC Role / Device Role / Timing Role: Main power switch executing precise half-cycle conduction timing; handles bidirectional current flow during AC zero-crossing transitions. Use Value: Snubberless (dl/dt)c ≥ 4.5 A/ms ensures clean turn-off under motor inductance, eliminating snubber losses and capacitor aging. |
Use Scenario: Solid-state relay for temperature-controlled oven or water heater using PID output to modulate AC power to resistive heating elements. IC Role / Device Role / Timing Role: High-reliability ON/OFF switching element replacing electromechanical relays; triggered at zero-crossing to minimize EMI. Use Value: 8 A RMS rating and 2.5 °C/W Rth(j-c) enable compact heatsink design while sustaining 100% duty cycle at ambient ≤ 50 °C. |
| Static Relay Replacement | Light Dimmer Module |
|
Use Scenario: Industrial PLC output module switching 230 VAC solenoids or contactors with >1 million cycle lifetime requirement. IC Role / Device Role / Timing Role: Fail-safe AC switching device with galvanically isolated tab; gate driven by optocoupler-isolated logic signal. Use Value: 2500 VRMS tab isolation satisfies reinforced insulation requirements per IEC 61800-5-1, removing need for secondary barrier design. |
Use Scenario: Residential wall-mounted dimmer controlling incandescent or halogen lamps via leading-edge phase-cut waveform. IC Role / Device Role / Timing Role: Bidirectional AC switch synchronized to zero-crossing detection; conducts only selected portion of each half-cycle. Use Value: 800 V VDRM provides 2.5× margin over 230 VAC peak (325 V), preventing avalanche failure during brownout or surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar snubberless 8 A/800 V triac applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTB08-800CW | Non-insulated TO-220AB package; identical 800 V/8 A rating and 35 mA IGT; no tab isolation | Requires external insulation (e.g., mica washer) for chassis-grounded heatsinks; lower assembly cost where isolation not mandated | Select when mechanical mounting allows direct heatsink contact and safety standards permit functional (not reinforced) insulation |
| T850-800G | D²PAK surface-mount package; 800 V/8 A; 50 mA IGT; Rth(j-c) = 1.6 °C/W; no tab isolation | Suitable for automated SMT production; higher thermal efficiency but needs PCB copper area ≥ 25 cm² for full 8 A rating | Select for high-volume, space-constrained designs where reflow compatibility and thermal performance outweigh through-hole serviceability |
Compared with BTB08-800CW, BTA08-800CRG adds certified 2500 VRMS isolation for direct chassis mounting; versus T850-800G, it trades SMT scalability for simplified thermal management and field-serviceable through-hole assembly.
Availability
BTA08-800CRG is available at Aetrix Electronics and suitable for motor speed controllers, heating regulation systems, static relay replacements, and light dimmer modules requiring stable component supply across industrial OEM and appliance production programs.
Supply support for BTA08-800CRG 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.
BTA08-800CRG belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power control in inductive-load applications such as motor drives and heating systems.
FAQ
What is the maximum junction temperature for continuous operation?
The BTA08-800CRG has a specified operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C requires thermal design ensuring case temperature does not exceed 100 °C, given its 2.5 °C/W junction-to-case resistance and 8 A RMS rating.
Can this triac be driven directly by a 3.3 V microcontroller GPIO?
Yes - with VGT ≤ 1.2 V and IGT ≤ 50 mA, the BTA08-800CRG accepts direct drive from 3.3 V MCUs. A series resistor (e.g., 68 Ω) limits gate current to ~32 mA at 3.3 V, staying within spec and providing noise margin against false triggering.
Is a snubber circuit required for inductive loads?
No - the "Snubberless" designation confirms guaranteed commutation performance: (dl/dt)c ≥ 4.5 A/ms without external components at 125 °C. This eliminates snubbers in motor starter and transformer primary switching, reducing cost and board area.
What is the creepage and clearance distance achieved with the insulated tab?
The TO-220AB Insulated package achieves 2500 VRMS reinforced insulation between tab and leads per UL E81734. Physical creepage exceeds 8 mm and clearance >4 mm, satisfying IEC 60730-1 Annex H for Class II appliance control circuits.
BTA08-800CRG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Standard
- 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):
- 25 mA
- Current - Hold (Ih) (Max):
- 25 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BTA08-800CRG FAQ
1.How can I place an order for BTA08-800CRG through Aetrix?
Please submit a Request for Quotation (RFQ) for BTA08-800CRG 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 BTA08-800CRG reliable?
The price and inventory of BTA08-800CRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA08-800CRG is usually 5 days.
3.What payment methods are accepted for BTA08-800CRG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA08-800CRG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTA08-800CRG?
BTA08-800CRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTA08-800CRG 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 BTA08-800CRG?
For technical support, including BTA08-800CRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA08-800CRG requirements.
6.How does Aetrix verify that BTA08-800CRG is sourced from the original manufacturer or authorized distributors?
All BTA08-800CRG 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 BTA08-800CRG meets industry standards.
7.What is the process for return or replacement of BTA08-800CRG?
All BTA08-800CRG units undergo pre-shipment inspection (PSI). If there is an issue with BTA08-800CRG, 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 BTA08-800CRG part is unused and in its original packaging.
Return procedure for BTA08-800CRG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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