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
What are the key features of T635T-8FPA?
- 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
What is T635T-8FPA used for?
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) |
Where can I find the T635T-8FPA datasheet?
T635T-8FPA Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for T635T-8FPA?
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.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
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.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Response time is incredible — usually under 4 hours. They understand that production lines can't wait.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit