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STMicroelectronics T835-800B-TR
- Part No.:
- T835-800B-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
T835-800B-TR.pdf
- Description:
- TRIAC ALTERNISTOR 800V 8A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
T835-800B-TR from STMicroelectronics is a snubberless 8 A, 800 V RMS triac in IPAK package, designed for AC phase control and switching in inductive loads. It features 35 mA maximum gate trigger current (IGT), 400 V/µs critical dV/dt at 125 °C, and 5.4 A/ms commutation capability without snubber. Used in motor speed controllers and heating regulation circuits requiring robust turn-off under reactive load conditions.
For engineers reviewing the T835-800B-TR datasheet, T835-800B-TR pinout, T835-800B-TR application, or T835-800B-TR equivalent, key selection criteria include snubberless commutation performance, logic-level gate drive compatibility, thermal resistance (Rth(j-c) = 1.6 °C/W), and IPAK surface-mount suitability for high-power density designs.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation optimized for inductive loads. Its 400 V/µs dV/dt rating at 125 °C and 5.4 A/ms (dI/dt)c ensure reliable turn-off without external snubbers in motor starting and dimmer applications.
The device uses a ceramic-insulated structure enabling direct mounting to heatsinks, and its 35 mA IGT allows direct interfacing with microcontroller GPIOs without buffer stages. Junction-to-case thermal resistance is 1.6 °C/W, supporting 8 A RMS conduction at Tc = 110 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS - supports continuous AC load current up to 8 A at case temperature ≤110 °C |
| VDRM / VRRM | 800 V - blocks 800 V peak off-state voltage in both directions, suitable for 230 VAC mains with safety margin |
| IGT (max) | 35 mA - gate trigger current sufficient for direct MCU GPIO drive (e.g., 3.3 V/5 V logic) |
| dV/dt (min) | 400 V/µs at 125 °C - enables reliable operation on inductive loads without snubber network |
| (dI/dt)c | 5.4 A/ms at 125 °C - ensures commutation stability during current zero-crossing in phase-control circuits |
| Rth(j-c) | 1.6 °C/W - allows efficient heat transfer to heatsink, enabling compact thermal design |
| VTM | 1.55 V at 11 A - low on-state voltage minimizes conduction losses and self-heating |
Pinout & Package
IPAK package (7-pin outline, tab-connected to A2); thermally enhanced surface-mount housing with insulated tab rated per UL E81734.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 | AC line input or load return path; referenced to gate for triggering |
| A2 | Main terminal 2 / Tab | High-current output path; electrically connected to metal tab for heatsinking and thermal conduction |
| G | Gate | Control input; triggers conduction between A1 and A2 when pulsed with ≥35 mA (max) at ≥1.2 V |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless commutation | Validated 400 V/µs dV/dt and 5.4 A/ms (dI/dt)c at 125 °C eliminates need for RC snubber on inductive loads |
| Logic-level gate drive | 35 mA max IGT enables direct interface with 3.3 V/5 V microcontrollers without external driver transistors |
| UL-certified insulated tab | 2500 VRMS isolation between tab (A2) and PCB mount surface per UL file E81734 |
| Halogen-free ECOPACK2 | DPAK/IPAK/D²PAK variants comply with RoHS and halogen-free standards (UL94 V0, lead-free plating) |
Applications
| Induction Motor Speed Control | Resistive Heating Regulation |
|---|---|
|
Use Scenario: Variable-speed control of single-phase induction motors in HVAC blowers and pumps. IC Role / Device Role / Timing Role: AC power switch performing phase-angle control to adjust RMS voltage delivered to motor windings. Use Value: Snubberless operation prevents false triggering during back-EMF transients, eliminating snubber component count and board space. |
Use Scenario: Precise temperature maintenance in industrial ovens and soldering stations using resistive heating elements. IC Role / Device Role / Timing Role: Bidirectional AC switch modulating power via leading-edge phase control synchronized to zero-crossing detection. Use Value: 8 A RMS rating and 1.55 V VTM minimize conduction loss and thermal stress across full operating temperature range (−40 to +125 °C). |
| Light Dimming Systems | Static Relay Replacement |
|
Use Scenario: Mains-powered LED and incandescent lamp dimmers with smooth brightness adjustment. IC Role / Device Role / Timing Role: High-voltage AC switch triggered by microcontroller-generated gate pulses aligned to AC phase angle. Use Value: 800 V VDRM provides margin for 230 VAC surge events (e.g., lightning-induced transients), improving system reliability. |
Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules and building automation panels. IC Role / Device Role / Timing Role: Fail-safe ON/OFF AC power switch controlled by isolated digital signal, with galvanic isolation via heatsink mounting. Use Value: IPAK package enables surface-mount assembly and direct heatsink attachment, reducing mechanical wear and contact bounce issues inherent in relay-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| T835-600B-TR | 600 V VDRM instead of 800 V; identical IGT (35 mA), package (IPAK), and snubberless rating | Suitable only for 120 VAC or 230 VAC systems with low surge risk; lacks margin for 230 VAC transient overvoltage | Select when cost sensitivity outweighs need for 800 V surge immunity in regulated environments |
| BTA08-800BW | TO-220AB insulated package; same 800 V/8 A rating but 50 mA IGT and higher Rth(j-c) = 2.5 °C/W | Requires through-hole assembly and larger heatsink; gate drive needs buffer stage due to higher IGT | Choose for legacy through-hole designs or where UL-rated insulated tab mounting is mandatory |
Compared with T835-800B-TR, T835-600B-TR trades voltage margin for cost, while BTA08-800BW sacrifices surface-mount efficiency and logic-level drive for mechanical insulation compliance-making the T835-800B-TR optimal for modern, space-constrained, microcontroller-driven AC control.
Availability
T835-800B-TR is available at Aetrix Electronics and suitable for induction motor control, resistive heating regulation, light dimming systems, and static relay replacement requiring stable component supply and long-term production continuity.
Supply support for T835-800B-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, MEMS, power, and microcontroller products for industrial, automotive, and consumer markets.
The T8 series belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC switching in inductive and capacitive load environments without external protection components.
FAQ
What is the maximum junction temperature for continuous operation?
The T835-800B-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 absolute maximum ratings, achievable with proper heatsinking and airflow per Rth(j-c) = 1.6 °C/W.
Does this triac require a snubber circuit for inductive loads?
No. The T835-800B-TR is a snubberless triac with validated 400 V/µs dV/dt and 5.4 A/ms (dI/dt)c ratings at 125 °C, enabling reliable commutation on inductive loads like motors and transformers without external RC snubber networks.
Can the gate be driven directly from a 3.3 V microcontroller?
Yes. With a maximum IGT of 35 mA and VGT ≤1.2 V, the T835-800B-TR accepts direct gate drive from standard 3.3 V or 5 V GPIO pins. A series resistor (e.g., 100 Ω) limits peak current to ~33 mA at 3.3 V, staying within safe operating limits.
Is the IPAK package lead-free and RoHS compliant?
Yes. The T835-800B-TR IPAK package is ECOPACK2-compliant, featuring halogen-free molding compound meeting UL94 V0 and lead-free plating per RoHS Directive 2011/65/EU, with full documentation available in ST's DS2114 datasheet Rev 16.
T835-800B-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- 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):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
T835-800B-TR FAQ
1.How can I place an order for T835-800B-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for T835-800B-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 T835-800B-TR reliable?
The price and inventory of T835-800B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835-800B-TR is usually 5 days.
3.What payment methods are accepted for T835-800B-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835-800B-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T835-800B-TR?
T835-800B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T835-800B-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 T835-800B-TR?
For technical support, including T835-800B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835-800B-TR requirements.
6.How does Aetrix verify that T835-800B-TR is sourced from the original manufacturer or authorized distributors?
All T835-800B-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 T835-800B-TR meets industry standards.
7.What is the process for return or replacement of T835-800B-TR?
All T835-800B-TR units undergo pre-shipment inspection (PSI). If there is an issue with T835-800B-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 T835-800B-TR part is unused and in its original packaging.
Return procedure for T835-800B-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T835-800B-TR Tags
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STMicroelectronics
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