ACST1635T-8FP STMicroelectronics Diode (Transistor Outline, Vertical) In Stock
The STMicroelectronics ACST1635T-8FP is a high-power TRIAC rated at 800 V and 16 A (RMS) with a 147 A surge current capability. It is housed in a 3-pin TO-220FPAB fully insulated package, designed for robust AC power control in industrial and appliance applications.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- ACST1635T-8FP Datasheet PDF
- Category
- Diode
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 800 V off-state voltage rating (VDRM/VRRM)
- 16 A RMS on-state current capacity
- 147 A peak surge current (ITSM)
- 3-pin TO-220FPAB fully insulated (isolated tab) package
- Bidirectional AC switching for direct line-voltage control
- Suitable for 8 ms gate trigger pulse control
Applications
The ACST1635T-8FP is designed for AC power control in home appliances such as washing machines, dishwashers, and motor speed controllers where bidirectional switching of 230 V mains is required. Its 16 A continuous rating and 800 V blocking voltage make it suitable for industrial heating control, lighting dimmers, and soft-start circuits. The fully insulated TO-220FPAB package simplifies thermal management by allowing direct mounting to a heat sink without an isolation pad.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ACST1635T-8FP:
Frequently Asked Questions
What is the maximum repetitive off-state voltage and RMS on-state current of the ACST1635T-8FP?
The ACST1635T-8FP is rated for 800 V maximum repetitive off-state voltage and 16 A RMS on-state current, making it well-suited for switching 230 V AC mains loads such as motor windings, heating elements, and lamp ballasts in residential and light industrial equipment.
How does the ACST1635T-8FP's fully insulated TO-220FPAB package simplify PCB and thermal design?
The TO-220FPAB package features a fully insulated (isolated) mounting tab, eliminating the need for a separate mica or polymer isolation washer between the device and a grounded heat sink. This reduces assembly steps, lowers thermal resistance to the heatsink, and improves mechanical reliability in high-current 16 A AC switching applications.
Can the ACST1635T-8FP handle short-circuit surge currents in a motor soft-start circuit?
Yes, the ACST1635T-8FP can withstand a non-repetitive peak surge current of 147 A for one half-cycle (8.3 ms at 60 Hz), which provides adequate margin for the inrush currents typical of motor starting, transformer energisation, and capacitive load turn-on events in industrial soft-start 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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