T635T-8FPA STMicroelectronics Integrated Circuit (Transistor Outline, Vertical) In Stock
STMicroelectronics T635T-8FPA is a 6A Snubberless TRIAC rated for 800V repetitive peak off-state voltage in a TO-220AB isolated package. It features logic-level gate triggering and quadrant operation suitable for AC power switching and motor control. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- T635T-8FPA Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Snubberless design eliminates the external RC snubber network, reducing BOM cost and board area in AC lighting and motor control circuits
- 6A on-state RMS current with 800V blocking voltage supports direct control of 230V AC mains loads such as heating elements and small motors
- Logic-level gate trigger compatibility allows direct drive from 3.3V or 5V microcontroller output pins without an intermediate driver stage
Applications
The T635T-8FPA serves as the power switch in AC phase-angle dimming circuits for resistive lighting loads and universal motor speed controllers rated up to 230V AC mains. Its Snubberless technology makes it well suited for inductive loads such as small pump and fan motors where a conventional TRIAC would require an external snubber to prevent false triggering. The TO-220AB isolated package simplifies thermal management on heatsink-mounted power control boards used in home appliances, HVAC systems, and industrial soft-start controllers.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the repetitive peak off-state voltage and on-state current rating of the T635T-8FPA?
The T635T-8FPA is rated at 800V repetitive peak off-state voltage (VDRM) and 6A on-state RMS current (IT(RMS)), making it suitable for switching resistive and lightly inductive loads directly on 230V AC mains with a comfortable safety margin above the nominal 325V peak.
Why can the T635T-8FPA operate without an external snubber network when driving inductive loads?
The Snubberless design incorporates internal structures that increase dv/dt immunity to over 500 V/µs, preventing false triggering caused by voltage transients from inductive load commutation. This removes the need for an external RC snubber, saving two components and reducing board area in motor and solenoid control designs.
What gate trigger current does the T635T-8FPA require and how does this affect microcontroller interface design?
The T635T-8FPA requires a gate trigger current (IGT) as low as 5mA to 10mA depending on trigger quadrant, which is within the sourcing capability of a standard optocoupler output or a 3.3V GPIO pin through a series resistor. This logic-level compatibility eliminates the need for a dedicated gate driver IC in most phase-control applications.
For a 1000W heating element controller, does the T635T-8FPA provide adequate current headroom on a 230V AC supply?
Yes. A 1000W load at 230V draws approximately 4.35A RMS, which is well within the T635T-8FPA 6A rating. With the TO-220AB mounted on a small heatsink to keep junction temperature below the 125°C maximum, the device operates with over 25% current margin, ensuring reliable long-term switching in thermostat and temperature-control applications.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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