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STMicroelectronics T850-6G-TR
- Part No.:
- T850-6G-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T850-6G-TR.pdf
- Description:
- TRIAC ALTERNISTOR 600V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:8,430
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Product details
Overview
T850-6G-TR from STMicroelectronics is a snubberless 8 A, 600 V triac in D²PAK (TO-263) package, designed for AC phase control and switching in inductive loads. It features 50 mA maximum gate trigger current (IGT), 400 V/µs critical dV/dt immunity at 125 °C, and 50 mΩ dynamic on-state resistance (RD) at Tj = 125 °C. Used in motor speed controllers and light dimmers requiring robust commutation performance.
For engineers reviewing the T850-6G-TR datasheet, T850-6G-TR pinout, T850-6G-TR application, or T850-6G-TR equivalent, key selection criteria include snubberless operation on inductive loads, logic-level-compatible gate drive (50 mA IGT), D²PAK thermal performance (Rth(j-c) = 1.6 °C/W), and 600 V repetitive peak off-state voltage rating.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation capability, enabling reliable turn-off under high-inductance conditions without external snubbers. Its 400 V/µs dV/dt immunity at 125 °C and minimum (dl/dt)c of 7 A/ms at (dV/dt)c = 10 V/µs ensure stable operation in noisy AC mains environments.
The device uses a ceramic-insulated die attach in D²PAK, delivering low thermal resistance (1.6 °C/W junction-to-case) and supporting RMS on-state current up to 8 A at Tc = 110 °C. On-state voltage is characterized by VTO = 0.85 V threshold and RD = 50 mΩ at 125 °C, defining conduction loss behavior in power stage design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A - Maximum continuous AC load current at Tc = 110 °C, defines thermal sizing for heatsink selection |
| VDRM / VRRM | 600 V - Peak repetitive off-state voltage rating, sets maximum AC line voltage compatibility (e.g., 230 VAC + margin) |
| IGT (max) | 50 mA - Maximum gate trigger current required at 12 V, determines driver strength needed (e.g., MCU GPIO + buffer) |
| dV/dt (min) | 400 V/µs - Minimum rate of rise of off-state voltage before false triggering, ensures noise immunity in inductive switching |
| Rth(j-c) | 1.6 °C/W - Junction-to-case thermal resistance, enables direct heatsink mounting and predicts ΔT across thermal interface |
| RD | 50 mΩ - Dynamic on-state resistance at 125 °C, used to calculate conduction loss (P = IT² × RD) in steady-state operation |
| VTM | 1.55 V - Peak on-state voltage at 11 A pulse, defines worst-case forward drop during surge or startup |
Pinout & Package
D²PAK (TO-263) surface-mount package with isolated tab rated at 2500 VRMS per UL E81734; copper pad area ≥1 cm² recommended for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (MT1) | Reference electrode for gate triggering; connected to neutral or low-side AC path in standard phase-control layouts |
| A2 | Main terminal 2 (MT2) | High-side AC load connection; carries full load current and defines voltage polarity reference for gate drive |
| G | Gate | Control input requiring ≥5 mA (typ.) pulse to initiate conduction; referenced to A1, compatible with 3.3 V/5 V logic drivers |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Enables direct drive of inductive loads (e.g., motors, solenoids) without external RC snubber networks, reducing BOM count and board space |
| High commutation performance | (dl/dt)c ≥ 7 A/ms at (dV/dt)c = 10 V/µs ensures reliable turn-off under fast current decay, critical for motor starting circuits |
| Logic-level gate sensitivity | 50 mA max IGT allows direct interfacing with microcontroller GPIOs or low-power drivers without additional transistor stages |
| UL-certified insulated tab | 2500 VRMS isolation between case and die meets safety requirements for Class I appliances and industrial controls |
| ECOPACK2 compliance | Halogen-free molding compound and lead-free plating meet RoHS and environmental compliance mandates for global deployment |
Applications
| Motor Speed Control | Light Dimming |
|---|---|
|
Use Scenario: Variable-speed control of universal or induction motors in fans, pumps, and power tools using phase-angle modulation. IC Role / Device Role / Timing Role: Main AC power switch triggered synchronously with zero-crossing detection to adjust conduction angle per half-cycle. Use Value: Eliminates need for mechanical speed controls; 8 A RMS rating supports >1 kW loads at 230 VAC with minimal heatsinking. |
Use Scenario: Smooth brightness adjustment of incandescent and halogen lamps in residential and commercial lighting systems. IC Role / Device Role / Timing Role: Bidirectional AC switch gated at programmable phase delay after zero-crossing to regulate RMS voltage delivered to lamp filament. Use Value: Snubberless design prevents flicker and audible noise caused by snubber capacitor discharge transients in dimmer circuits. |
| Heating Regulation | Static Relay Replacement |
|
Use Scenario: Precise temperature control in electric ovens, soldering irons, and HVAC duct heaters via duty-cycled AC power delivery. IC Role / Device Role / Timing Role: High-reliability solid-state switch replacing electromechanical contactors; operated in burst-fire or phase-control mode. Use Value: 600 V VDRM provides 2× margin over 230 VAC mains, while 8 A rating supports resistive loads up to 1.8 kW without derating. |
Use Scenario: Solid-state replacement for electromagnetic relays in PLC output modules, industrial control panels, and safety interlocks. IC Role / Device Role / Timing Role: Fail-safe ON/OFF AC switching element controlled by low-voltage logic; requires no coil drive or contact bounce management. Use Value: D²PAK package enables automated SMT assembly and delivers 1.6 °C/W thermal resistance for long-life operation at full 8 A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| T850-8G-TR | 800 V VDRM/VRRM rating vs. 600 V; identical IGT, package, and snubberless performance | Better suited for 400 VAC industrial systems or designs requiring higher voltage margin on 230 VAC mains | Select when system transient voltage exceeds 600 V peak or for global product variants covering multiple regional AC standards |
| BTA08-600BW | TO-220AB insulated package; same 600 V/8 A rating and 50 mA IGT, but Rth(j-c) = 2.5 °C/W (vs. 1.6 °C/W) | Requires larger heatsink for equivalent thermal performance; through-hole mounting limits PCB density | Prefer for legacy through-hole designs or where mechanical mounting torque (0.55 N·m) is preferred over SMT reflow process control |
Compared with T850-6G-TR, T850-8G-TR offers higher voltage headroom without thermal or drive trade-offs, while BTA08-600BW sacrifices thermal efficiency and automation compatibility for mechanical mounting flexibility and UL-insulated case integration.
Availability
T850-6G-TR 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, appliance, and building automation programs.
Supply support for T850-6G-TR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The T8 series belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power switching in inductive and resistive loads without external protection components.
FAQ
What is the maximum junction temperature for continuous operation of T850-6G-TR?
The T850-6G-TR has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C requires maintaining case temperature ≤110 °C per the IT(RMS) derating curve in Figure 2, achievable with appropriate heatsinking and copper area (≥1 cm²) under the D²PAK tab.
Can T850-6G-TR be driven directly by a 3.3 V microcontroller GPIO?
Yes - with IGT(max) = 50 mA and VGT(max) = 1.2 V, the T850-6G-TR can be triggered by a 3.3 V MCU GPIO using a series resistor (e.g., 47 Ω) to limit gate current to ~50 mA. Gate drive must deliver ≥100 µs pulse width and meet minimum di/dt requirements per datasheet Figure 8.
Is a heatsink required for 8 A RMS operation?
Yes - at 8 A RMS and Tc = 110 °C, the D²PAK package dissipates ~3.2 W (using VTM ≈ 1.55 V and RD = 50 mΩ). With Rth(j-c) = 1.6 °C/W, junction temperature rises ~5.1 °C above case; a heatsink is mandatory to maintain Tc ≤ 110 °C and prevent thermal runaway.
Does T850-6G-TR support four-quadrant triggering?
No - the T850-6G-TR is a three-quadrant snubberless triac (quadrants I, II, III only). It does not support quadrant IV triggering (A2 negative, G positive), unlike standard four-quadrant devices such as BTA08-600C. This simplifies gate drive design but excludes certain legacy phase-control topologies.
T850-6G-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for T850-6G-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for T850-6G-TR 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-TR reliable?
The price and inventory of T850-6G-TR 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-TR is usually 5 days.
3.What payment methods are accepted for T850-6G-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T850-6G-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T850-6G-TR?
T850-6G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T850-6G-TR 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-TR?
For technical support, including T850-6G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T850-6G-TR requirements.
6.How does Aetrix verify that T850-6G-TR is sourced from the original manufacturer or authorized distributors?
All T850-6G-TR 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-TR meets industry standards.
7.What is the process for return or replacement of T850-6G-TR?
All T850-6G-TR units undergo pre-shipment inspection (PSI). If there is an issue with T850-6G-TR, 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-TR part is unused and in its original packaging.
Return procedure for T850-6G-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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