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STMicroelectronics T850-6G
- Part No.:
- T850-6G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T850-6G.pdf
- Description:
- TRIAC ALTERNISTOR 600V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,237
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Product details
Overview
T850-6G from STMicroelectronics is a snubberless 8 A, 600 V triac in D²PAK package, designed for AC phase control and switching in inductive loads. It delivers 50 mA gate trigger current (IGT), 1.55 V on-state voltage (VTM) at 11 A, and 4.5 A/ms critical commutation current (dl/dt)c without snubber at 125 °C-enabling direct microcontroller interface and robust motor speed control.
For engineers reviewing the T850-6G datasheet, T850-6G pinout, T850-6G application, or T850-6G equivalent, key selection criteria include snubberless operation on inductive loads, 600 V repetitive peak off-state voltage (VDRM), 8 A RMS on-state current (IT(RMS)), and compatibility with logic-level gate drivers in compact surface-mount designs.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation capability, supporting reliable turn-off under high dV/dt stress up to 1000 V/µs at 125 °C. Its internal ceramic pad ensures galvanic isolation between main terminals and heatsink mounting surface.
Designed for phase-angle control, it features low 50 mΩ dynamic on-state resistance (RD) and 0.85 V threshold voltage (VTO) at 125 °C, enabling efficient power delivery with minimal conduction loss in heating regulation and light dimming circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current - supports continuous AC load switching up to 1.8 kW at 230 VAC. |
| VDRM / VRRM | 600 V repetitive peak off-state voltage - withstands line transients in 230 VAC mains applications. |
| IGT | 50 mA max gate trigger current - compatible with standard MCU GPIO outputs without external driver stage. |
| (dl/dt)c | 4.5 A/ms minimum critical commutation current (no snubber) - enables reliable turn-off on inductive loads like motors and solenoids. |
| VTM | 1.55 V max on-state voltage at 11 A - limits conduction loss to ≤17 W at full RMS current. |
| Rth(j-c) | 1.6 °C/W junction-to-case thermal resistance - allows 8 A operation with 110 °C case temperature using moderate heatsinking. |
| dV/dt | 1000 V/µs min critical rate of rise of off-state voltage - suppresses false triggering in noisy industrial environments. |
Pinout & Package
D²PAK (TO-263) surface-mount package with isolated tab rated at 2500 VRMS per UL E81734; thermally optimized for PCB copper area ≥1 cm².
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (MT1) | Reference terminal for gate trigger; connects to neutral or low-side AC path. |
| A2 | Main terminal 2 (MT2) | High-side AC load connection; carries full load current and withstands 600 V reverse blocking. |
| G | Gate | Controls conduction onset; triggers at ≤50 mA with 12 V drive into 30 Ω load per datasheet test condition. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Enables direct use on inductive loads without external RC snubber networks, reducing BOM count and board space. |
| Logic-level gate sensitivity | 50 mA IGT allows direct drive from 3.3 V or 5 V microcontrollers without level-shifting or amplification. |
| High commutation performance | 4.5 A/ms (dl/dt)c at 125 °C ensures reliable turn-off during zero-crossing interruption in motor control. |
| Isolated mounting tab | 2500 VRMS insulation rating permits safe mechanical mounting to grounded heatsinks in Class I equipment. |
| Halogen-free ECOPACK2 | Meets RoHS and REACH requirements with lead-free plating and UL94 V0 molding compound. |
Applications
| Motor Speed Control | Light Dimming |
|---|---|
Use Scenario: Variable-speed control of single-phase induction motors in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Triac-based phase-angle controller regulating RMS voltage delivered to motor windings. Use Value: Eliminates need for snubber components while maintaining stable commutation across 0–100% speed range under inductive load. | Use Scenario: Mains-powered LED or incandescent lamp brightness adjustment in residential and commercial lighting. IC Role / Device Role / Timing Role: AC line-switching element synchronized to zero-crossing detection for smooth dimming. Use Value: 600 V VDRM and 1000 V/µs dV/dt rating prevent false triggering from line noise during rapid dimming transitions. |
| Heating Regulation | Static Relay Replacement |
Use Scenario: Solid-state temperature control in electric ovens, soldering stations, and industrial heaters. IC Role / Device Role / Timing Role: High-reliability AC switch replacing electromechanical relays in duty-cycle modulated heating elements. Use Value: 8 A IT(RMS) and 80 A non-repetitive surge rating support repeated thermal cycling without contact wear or arcing. | Use Scenario: Contactless switching in PLC output modules and building automation systems. IC Role / Device Role / Timing Role: Isolated AC output stage driving resistive or inductive loads up to 1.8 kW. Use Value: 2500 VRMS insulated tab meets reinforced insulation requirements for functional safety in IEC 61000-4-5 compliant designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTA08-600BW | TO-220AB insulated package; identical 600 V / 8 A / 50 mA specs; higher Rth(j-c) = 2.5 °C/W. | Requires screw-mount heatsink; better suited for panel-mounted industrial controls than SMT PCBs. | Select when mechanical mounting rigidity and UL-certified isolation are prioritized over board space. |
| T835-600G | D²PAK package; 35 mA IGT (vs. 50 mA); lower (dl/dt)c = 7 A/ms without snubber; same VDRM/IT(RMS). | Lower gate drive requirement but reduced commutation margin on highly inductive loads. | Select when gate drive current budget is constrained and load inductance is moderate (e.g., fans vs. compressors). |
Compared with BTA08-600BW, T850-6G offers superior thermal performance in SMT layout and smaller footprint; compared with T835-600G, it provides higher commutation robustness for demanding motor starting applications at the cost of slightly higher gate drive demand.
Availability
T850-6G 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 and consumer electronics programs.
Supply support for T850-6G 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The T8 series belongs to ST's high-performance snubberless triac product line, engineered specifically for reliable AC switching in inductive and resistive loads where space-constrained SMT integration and gate-drive simplicity are critical.
FAQ
What is the maximum junction temperature for continuous operation of T850-6G?
The T850-6G has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C requires maintaining case temperature ≤110 °C per absolute maximum ratings, achievable with ≥1 cm² copper area and appropriate thermal vias in D²PAK layout.
Does T850-6G require a heatsink in all applications?
Yes - at full 8 A RMS load, junction-to-case thermal resistance (1.6 °C/W) necessitates heatsinking to limit Tj ≤125 °C. For intermittent loads <3 A, PCB copper alone may suffice; thermal simulation using Zth(j-a) curves from DS2114 Rev 16 page 4 is recommended for precise sizing.
Can T850-6G be used with zero-crossing trigger circuits?
No - T850-6G is a phase-control triac optimized for leading-edge firing. Zero-crossing operation requires dedicated zero-crossing opto-triacs (e.g., MOC3063) or integrated ICs; using T850-6G in zero-cross mode risks unreliable turn-on due to insufficient gate current near voltage zero.
Is the D²PAK tab of T850-6G electrically isolated from the die?
No - unlike TO-220AB Ins. variants (e.g., BTA08-600S), the D²PAK package of T850-6G has a non-isolated tab directly connected to A2. Electrical isolation must be achieved via insulating shoulder washers or thermal pads rated for 2500 VRMS if mounting to grounded metal.
T850-6G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 600 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.2 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:
- Surface Mount
- Supplier Device Package:
- D2PAK
T850-6G FAQ
1.How can I place an order for T850-6G through Aetrix?
Please submit a Request for Quotation (RFQ) for T850-6G 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 T850-6G reliable?
The price and inventory of T850-6G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T850-6G is usually 5 days.
3.What payment methods are accepted for T850-6G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T850-6G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T850-6G?
T850-6G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T850-6G 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 T850-6G?
For technical support, including T850-6G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T850-6G requirements.
6.How does Aetrix verify that T850-6G is sourced from the original manufacturer or authorized distributors?
All T850-6G 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 T850-6G meets industry standards.
7.What is the process for return or replacement of T850-6G?
All T850-6G units undergo pre-shipment inspection (PSI). If there is an issue with T850-6G, 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 T850-6G part is unused and in its original packaging.
Return procedure for T850-6G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T850-6G Tags
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Z0103NN5AA4
STMicroelectronics
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