Design Win

Overvoltage protected AC switch

Download datasheet Order Direct

Product overview


The ACST1635-8FP belongs to the AC power switch range built with A.S.D.®technology. This high performance device is designed for home appliances or industrial systems and drives loads up to 16 A.

This ACST1635-8FP switch embeds a Triac structure with a high voltage crowbar device to absorb the inductive turn-off energy and withstand line surges such as those described in the IEC 61000-4-5 (surge immunity test).

  • All features

    • Enables equipment to meet IEC 61000-4-5 surge with overvoltage crowbar technology
    • High noise immunity against static dV/dt and IEC 61000-4-4 burst
    • High junction temperature: Tj= 150 °C
    • Needs no external over-voltage protection
    • VCLgives headroom before clamping then crowbar action
    • Reduces component count
    • ECOPACK®2 compliant component
    • Complies with UL standards (File ref: E81734)
    • Provides UL certified insulation rated at 2000 V rms


eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

Power Management Design Center

Thermal-electrical Simulators for Components

Signal Conditioning Design Tool

NFC/RFID Calculators

Choose design tool:

Power Supply Design Tool

SMPS design, by topology, by type and by product
PFC design with analog and digitial control
Supports various PCB configurations
Choose type:
Solar Battery Charger

LED Lighting Design Tool

Handles AC-DC and DC-DC design in common topologies
Displays interactive and annotated schematic
Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data
Choose type:

Digital Power Workbench

Provides a step-by-step optimized design of power section and control loop
Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs

Power Tree Designer

Specify input/output power for each node in the tree
Check for consistency
Design each individual node
Choose design tool:

AC Switches Simulator

Select ratings and application waveforms
Get junction temperature and blocking voltage graphs
Search and sort suitable devices

Rectifier Diodes Simulator

Select ratings and application waveforms
Estimate power losses
Search and sort suitable devices


Supports long mission profiles
Provides power loss and temperature graphs
Helps define heatsink thermal properties

Twister Sim

Help select the right ViPOWER Automotive power device
Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
Supports various PCB configurations

TVS Simulator

Specify system ratings and surge waveform
Search and sort suitable devices


Build simple schematics and firmware inputs in minutes
Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs
Choose design tool:

Active Filters

Handles multi-stage-designs and common topologies
Returns circuit component values
Provides gain, phase and group delay graphs
Low Pass, High Pass and Band Pass


Handles most common configurations
Returns circuit components values
Provides I/O signal waveforms
Inverting, Non Inverting, Window

Low side Current Sensing

Returns circuit component values
Provides current error graphs

High side Current Sensing

Provides current error graphs.
Help to select the right High side current sensing and shunt devices.
Choose design tool:

NFC Inductance

Input geometry and substrate properties
Get antenna impedance

UHF Link Budget

Enter forward and reverse link characteristics
The tool returns link budget estimate

NFC Tuning Circuit

Enter antenna parameter and matching target
Select the topology of the matching network
The tool returns component values for the desired design targets

You might also like...

EDA Symbols, Footprints and 3D Models

STMicroelectronics - ACST1635-8FP

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Please select one model supplier :





3D model

3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
TO-220FPAB Industrial Ecopack2




Material Declaration**:


Marketing Status






RoHS Compliance Grade


(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Swipe or click the button to explore more details Don't show this again
Part Number
Marketing Status
Budgetary Price (US$)*/Qty
Order from ST
Order from distributors
Packing Type
Country of Origin
Operating Temperature (°C) (max)
Rising Ratio Of Off Voltage (V/µs) (min) (@ TJ(max))
Rate of decrease of commutating on-state current (A/ms) (min) (@ TJ(max))
Triggering gate current max (mA) (I, II, III)
Available at distributors

Distributor availability of ACST1635-8FP

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office

ACST1635-8FP Active

Budgetary Price (US$)*/Qty:
Packing Type:
Country of Origin:

Part Number:


Operating Temperature (°C) (max):


Rising Ratio Of Off Voltage (V/µs) (min) (@ TJ(max)):


Rate of decrease of commutating on-state current (A/ms) (min) (@ TJ(max)):


Triggering gate current max (mA) (I, II, III):

35, 35, 35

Distributor Name

Distributor reported inventory date:

Swipe or click the button to explore more details Don't show this again

(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors