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STMicroelectronics T1635T-8FP
- Part No.:
- T1635T-8FP
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
T1635T-8FP.pdf
- Description:
- TRIAC ALTERNISTOR 800V TO220FPAB
- Quantity:
- Payment:
- Shipping:
Inventory:69
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Product details
Overview
T1635T-8FP from STMicroelectronics is a 16 A, 800 V Snubberless™ Triac in TO-220FPAB package, designed for quadrant I/II/III AC line switching with high commutation robustness. It delivers 120 A non-repetitive surge current (50 Hz), supports snubberless operation within datasheet limits, and provides UL-certified 2 kV insulation - used in motor control, lighting dimmers, and inrush limiting circuits.
For engineers reviewing the T1635T-8FP datasheet, T1635T-8FP pinout, T1635T-8FP application, or T1635T-8FP equivalent, key selection criteria include dV/dt immunity (≥2000 V/µs at 125 °C), (dI/dt)c (16 A/ms at 125 °C), gate trigger sensitivity (35 mA max), and thermal resistance (3.3 °C/W junction-to-case).
Technical Context
This triac operates across all three quadrants (I, II, III) without requiring gate polarity reversal, enabling simplified drive circuitry in bidirectional AC control. Its Snubberless™ architecture eliminates external RC snubbers when operated within specified dV/dt and (dI/dt)c limits - validated at 2000 V/µs (125 °C) and 16 A/ms (125 °C).
It features a low on-state voltage (1.55 V max at 22.6 A, 25 °C) and dynamic resistance of 27 mΩ (150 °C), supporting efficient power handling in thermally constrained designs. UL certification (E81734) and ECOPACK®2 compliance confirm suitability for safety-critical and environmentally regulated applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 16 A - continuous RMS load current capability at 87 °C case temperature |
| VDRM / VRRM | 800 V - peak repetitive off-state voltage rating at 125 °C junction |
| IGT (max) | 35 mA - maximum gate trigger current required to ensure turn-on under worst-case conditions |
| dV/dt (min) | 2000 V/µs - minimum critical rate of rise of off-state voltage before false triggering at 125 °C |
| (dI/dt)c | 16 A/ms - minimum critical rate of decrease of on-state current to maintain commutation at 125 °C |
| Rth(j-c) | 3.3 °C/W - thermal resistance from junction to case, defining heatsink sizing requirements |
| Vins | 2 kV rms - UL-certified isolation voltage for 1 minute, ensuring reinforced insulation integrity |
Pinout & Package
Package: TO-220FPAB - insulated through-hole package with metal tab isolated from A2, rated for 260 °C soldering (10 s), 0.4–0.6 N·m mounting torque, and 2.0 g unit weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (anode 1) | Reference terminal for gate drive; connected to load return in most phase-control topologies |
| A2 | Main terminal 2 (anode 2) | High-side AC line connection; electrically isolated from mounting tab per UL 2 kV rating |
| G | Gate | Low-energy trigger input; requires ≤35 mA pulse to initiate conduction in any quadrant |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Eliminates external RC snubber components when dV/dt < 20 V/µs and (dI/dt)c ≥16 A/ms |
| Three-quadrant triggering | Enables gate-triggered turn-on in quadrants I, II, and III - no polarity reversal needed for AC phase control |
| High commutation robustness | Guaranteed (dI/dt)c = 16 A/ms at 125 °C ensures reliable turn-off under inductive load transients |
| UL-certified insulation | 2 kV rms isolation withstand for 1 minute confirms safety compliance in mains-connected appliances |
| ECOPACK®2 compliance | Lead-free, RoHS-compliant construction with halogen-free molding compound per environmental regulations |
Applications
| Motor Control | Lighting Dimming |
|---|---|
|
Use Scenario: Speed regulation of universal motors in vacuum cleaners and power tools using phase-angle control. IC Role / Device Role / Timing Role: Bidirectional main switching element triggered by zero-crossing synchronized gate pulses. Use Value: Enables smooth speed control without snubber losses; 16 A IT(rms) supports >1.8 kW loads at 115 VAC. |
Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential lighting systems. IC Role / Device Role / Timing Role: AC line switch modulating conduction angle per TRIAC firing delay after zero-crossing detection. Use Value: High dV/dt immunity (2000 V/µs) prevents false triggering from lamp filament inrush transients. |
| Inrush Current Limiting | Overvoltage Crowbar Protection |
|
Use Scenario: Controlled turn-on of transformer primary windings or large capacitive loads to limit peak inrush. IC Role / Device Role / Timing Role: Soft-start switch activated after fixed delay to bypass NTC thermistor or series resistor. Use Value: 120 A ITSM surge rating handles 20 ms inrush peaks without degradation; TO-220FPAB enables direct heatsinking. |
Use Scenario: Fast-acting crowbar protection for DC bus overvoltage events in AC/DC power supplies. IC Role / Device Role / Timing Role: Triggered short-circuit device clamping bus voltage by dumping energy into sacrificial fuse path. Use Value: Low VT (1.55 V) minimizes dissipation during crowbar conduction; 95 A²s I²t rating coordinates with fast-blow fuses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTB16-800CW | Same 16 A/800 V rating but 50 mA IGT max; lower dV/dt (1000 V/µs at 125 °C); no UL certification | Lacks UL 2 kV isolation; unsuitable for safety-critical mains-connected products requiring certified insulation | Select only for cost-sensitive industrial controls where UL compliance is not mandated |
| T1635H-8FP | Same die but TO-220AB (non-isolated tab); identical electrical specs except Vins = 0 V (tab tied to A2) | Requires insulated mounting hardware; cannot replace T1635T-8FP in UL-certified designs without redesign | Choose only when mechanical layout permits tab isolation and safety certification is handled externally |
Compared with BTB16-800CW and T1635H-8FP, the T1635T-8FP uniquely combines UL-certified 2 kV isolation, 35 mA gate sensitivity, and Snubberless™ operation - making it the sole option for compact, certified, snubber-free AC switching in consumer appliances.
Availability
T1635T-8FP is available at Aetrix Electronics and suitable for motor control, lighting dimming, and inrush current limiting applications requiring stable component supply, long-term lifecycle support, and UL-compliant insulation integrity.
Supply support for T1635T-8FP 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 T1635T-8FP belongs to ST's Snubberless™ Triac product line, engineered specifically for reliable, space-efficient AC power control in safety-certified appliances and equipment where snubber elimination reduces bill-of-materials cost and board area.
FAQ
Can T1635T-8FP operate without a snubber circuit?
Yes - it is explicitly rated for snubberless operation when applied within its defined dV/dt and (dI/dt)c limits: dV/dt ≤20 V/µs and (dI/dt)c ≥16 A/ms at 125 °C. Exceeding these thresholds risks false triggering or commutation failure, requiring external snubbing per Figure 11 and Table 2 of the datasheet.
What is the maximum junction temperature and how does it affect performance?
The absolute maximum junction temperature is +150 °C. At this temperature, key parameters degrade: dV/dt drops to 1000 V/µs, (dI/dt)c falls to 8 A/ms, and leakage current rises to 3.0 mA. Derating curves in Figures 2 and 3 define safe operating area based on case or ambient temperature and thermal resistance.
Is the TO-220FPAB package electrically isolated, and what is its insulation rating?
Yes - the TO-220FPAB package features an insulated metal tab (A2 terminal isolated from mounting surface). It is UL-certified for 2 kV rms insulation withstand voltage for 1 minute (File E81734), enabling direct heatsink mounting without additional isolation hardware in Class I appliance designs.
How does the "T" suffix in T1635T-8FP impact device behavior?
Per ST's ordering scheme (Table 7), the "T" denotes enhanced commutation performance: higher (dI/dt)c and dV/dt ratings versus standard variants. Specifically, T1635T-8FP achieves 16 A/ms (dI/dt)c at 125 °C and 2000 V/µs dV/dt - compared to 10 A/ms and 1000 V/µs for non-T versions - enabling more robust operation with inductive loads.
T1635T-8FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 16 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 120A, 126A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 40 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FPAB
T1635T-8FP FAQ
1.How can I place an order for T1635T-8FP through Aetrix?
Please submit a Request for Quotation (RFQ) for T1635T-8FP 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 T1635T-8FP reliable?
The price and inventory of T1635T-8FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1635T-8FP is usually 5 days.
3.What payment methods are accepted for T1635T-8FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1635T-8FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1635T-8FP?
T1635T-8FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1635T-8FP 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 T1635T-8FP?
For technical support, including T1635T-8FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1635T-8FP requirements.
6.How does Aetrix verify that T1635T-8FP is sourced from the original manufacturer or authorized distributors?
All T1635T-8FP 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 T1635T-8FP meets industry standards.
7.What is the process for return or replacement of T1635T-8FP?
All T1635T-8FP units undergo pre-shipment inspection (PSI). If there is an issue with T1635T-8FP, 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 T1635T-8FP part is unused and in its original packaging.
Return procedure for T1635T-8FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T1635T-8FP Tags
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STMicroelectronics
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BTA08-600CWRG
STMicroelectronics
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T835H-6G-TR
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