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STMicroelectronics ACS108-6SA
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- Part No.:
- ACS108-6SA
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ACS108-6SA.pdf
- Description:
- TRIAC SENS GATE 600V 0.45A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:9,286
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Product details
Overview
ACS108-6SA from STMicroelectronics is a 0.8 A, 600 V RMS AC switch with integrated overvoltage crowbar protection (VCL ≥ 650 V), negative-gate-triggered operation, and TO-92 package. It replaces discrete triac + snubber designs in low-power AC load control, enabling direct microcontroller interface without external protection components for inductive loads up to 15 H (e.g., solenoids, valves, small motors).
For engineers reviewing the ACS108-6SA datasheet, ACS108-6SA pinout, ACS108-6SA application, or ACS108-6SA equivalent, this device offers verified IEC 61000-4-5 surge immunity (2 kV line-to-line), dV/dt immunity ≥ 2000 V/μs at 125 °C, and gate-level shifting for controller isolation - critical for appliance motor control, HVAC actuators, and industrial relay replacement.
Technical Context
The ACS108-6SA implements A.S.D.® (Advanced Static Discharge) technology, combining a high-voltage thyristor structure with an integrated crowbar clamping section that activates above VCL = 650 V to absorb inductive turn-off energy. Its gate driver uses level-shifting to isolate digital logic from mains-referenced switching.
Triggering requires a negative gate current (IGT ≤ 10 mA) flowing *out* of the G pin - compatible with open-drain MCU outputs via a single series resistor (e.g., 220 Ω). The device operates in Quadrants II and III only and recovers blocking capability automatically at the next current zero-crossing after surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 0.8 A - Sustains continuous AC load current up to 0.8 A RMS at Tlead = 76 °C on 5 cm² copper, suitable for solenoids, fans, and lamp dimming. |
| VDRM / VRRM | 600 V - Blocks 600 V peak reverse/forward voltage, compatible with 230 VAC mains (325 V peak) with 85 V margin. |
| VCL | ≥ 650 V - Clamps inductive turn-off overvoltage before crowbar action, eliminating need for external varistors or RC snubbers. |
| dV/dt immunity | ≥ 2000 V/μs at 125 °C - Immune to fast transients and ESD bursts without false triggering in noisy industrial environments. |
| IGT | ≤ 10 mA - Low gate drive requirement enables direct connection to 3.3 V/5 V MCUs using a single current-limiting resistor. |
| Rd | ≤ 300 mΩ at 125 °C - Low on-state resistance minimizes conduction loss (≤ 0.24 W at 0.8 A), reducing thermal stress in TO-92 package. |
| VTM | ≤ 1.3 V at 1.1 A - Confirmed on-state voltage drop ensures predictable power dissipation and thermal design. |
Pinout & Package
Package: TO-92 (ECOPACK®, lead-free plating, halogen-free molding compound; outline per DS1641 Fig. 17; weight 0.2 g).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Common reference terminal | Connected directly to AC mains neutral or phase return path; serves as shared ground reference for multiple ACS devices on one heatsink. |
| OUT | Switched output terminal | Delivers controlled AC power to load (e.g., solenoid coil); voltage referenced to COM during conduction. |
| G | Negative gate input | Receives sinking current (≤10 mA) from MCU GPIO; triggers conduction when current flows *out* of G pin into controller. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | VCL ≥ 650 V clamps turn-off spikes and absorbs IEC 61000-4-5 surges (2 kV), removing need for external MOVs or snubbers. |
| High dV/dt immunity | 2000 V/μs at 125 °C prevents false triggering in electrically noisy appliances and industrial controls. |
| Direct MCU interface | 10 mA gate current requirement allows single-resistor connection to 3.3 V/5 V microcontrollers without level shifters. |
| Common-tab thermal sharing | TO-92 tab (COM pin) enables mounting multiple ACS switches on same heatsink for multi-channel AC control. |
| A.S.D.® technology | Proprietary ST structure combines gate-level shifting and avalanche-rated clamping for robust inductive load commutation. |
Applications
| Appliance Solenoid Control | HVAC Air Flow Dampers |
|---|---|
Use Scenario: Controlling water inlet valves in washing machines and dishwashers with 12–24 V DC logic and 230 VAC mains power. IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relay; triggered by MCU GPIO pulse synchronized to zero-crossing detection. Use Value: Eliminates relay coil arcing and contact wear; reduces BOM count by removing snubber network and optocoupler isolation. | Use Scenario: Driving 230 VAC damper actuators in residential HVAC systems requiring precise airflow modulation. IC Role / Device Role / Timing Role: Solid-state AC switch providing silent, bounce-free on/off control with fast response (< 10 ms turn-on delay). Use Value: Enables compact PCB layout with shared COM heatsinking across multiple dampers; withstands repeated inductive turn-off stress without degradation. |
| Industrial Door Locks | Small Fan/Motor Control |
Use Scenario: Powering electromagnetic door locks in access control panels operating from 230 VAC mains with microcontroller-based scheduling. IC Role / Device Role / Timing Role: High-noise-immunity AC switch ensuring reliable lock engagement even during nearby motor starts or lightning-induced surges. Use Value: Meets IEC 61000-4-4 burst (4 kV) and IEC 61000-4-5 surge (2 kV) without external protection, simplifying certification. | Use Scenario: Speed-controlled ventilation fans in medical equipment and laboratory instruments using phase-angle or burst-fire AC control. IC Role / Device Role / Timing Role: Low-Rd (≤300 mΩ), low-IGT (≤10 mA) AC switch enabling efficient, low-heat switching at 50/60 Hz. Use Value: Reduces conduction loss vs. standard triacs, allowing TO-92 mounting without forced air cooling in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-6S | No "A" suffix - bulk-packaged variant (same electrical specs, identical TO-92 footprint and pinout). | Identical functional behavior; differs only in packaging (2500 pcs bulk vs. 2500 pcs bulk for -6SA - no practical difference). | Select -6SA for traceability and ST's preferred ordering code; -6S is legacy marking with identical performance. |
| BT134-600 | Standard triac (no integrated crowbar); IGT = 5 mA but requires external snubber and MOV for IEC 61000-4-5 compliance. | Cannot replace ACS108-6SA without adding ≥3 external components; lacks VCL clamping and fails dV/dt immunity spec at 125 °C. | Only consider if cost is primary constraint and system-level surge protection is already implemented externally. |
Compared with ACS108-6SA, ACS108-6S offers identical functionality in alternate packaging, while BT134-600 demands full redesign for surge robustness - making ACS108-6SA the only drop-in solution for simplified, certified AC load switching.
Availability
ACS108-6SA is available at Aetrix Electronics and suitable for appliance solenoid control, HVAC damper actuation, industrial door lock systems, and small fan/motor switching requiring stable component supply and long-term lifecycle support.
Supply support for ACS108-6SA 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The ACS™ AC switch product line targets solid-state replacement of electromechanical relays in low-power AC load control, emphasizing integrated surge protection, noise immunity, and direct MCU compatibility without external components.
FAQ
What is the correct gate drive configuration for ACS108-6SA?
The ACS108-6SA requires a *sinking* gate current: connect the G pin to an MCU GPIO configured as open-drain or push-pull with current-limiting resistor (e.g., 220 Ω to 3.3 V), so current flows *out* of G into the controller. Do not apply positive voltage to G - it will not trigger and may damage the gate.
Can ACS108-6SA drive a 15 H solenoid safely without external components?
Yes - its integrated VCL ≥ 650 V crowbar structure clamps turn-off overvoltage from high-inductance loads (up to 15 H), dissipating stored energy internally. No snubber, varistor, or flyback diode is required, as confirmed by ST's Figure 14 test waveforms and IEC 61000-4-5 validation.
What is the maximum ambient temperature for continuous 0.8 A operation?
At natural convection on FR4 PCB with 5 cm² copper, the ACS108-6SA delivers 0.8 A RMS up to 64 °C ambient (Tamb), per Table 1. Above 64 °C, derating applies: e.g., 0.45 A at Tamb = 76 °C with 5 cm² copper, as shown in Figure 2.
Does ACS108-6SA support zero-crossing switching?
No - it is a random-phase AC switch. Conduction begins immediately upon gate trigger and ends naturally at the next current zero-crossing. For zero-crossing operation, use ST's Z01xxMN series or external zero-crossing detection circuitry with ACS108-6SA.
ACS108-6SA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 600 V
- Current - On State (It (RMS)) (Max):
- 450 mA
- Voltage - Gate Trigger (Vgt) (Max):
- 1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 7.3A, 7.6A
- Current - Gate Trigger (Igt) (Max):
- 10 mA
- Current - Hold (Ih) (Max):
- 25 mA
- Configuration:
- Single
- Operating Temperature:
- -30°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
ACS108-6SA FAQ
1.How can I place an order for ACS108-6SA through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS108-6SA 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 ACS108-6SA reliable?
The price and inventory of ACS108-6SA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS108-6SA is usually 5 days.
3.What payment methods are accepted for ACS108-6SA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS108-6SA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS108-6SA?
ACS108-6SA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS108-6SA 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 ACS108-6SA?
For technical support, including ACS108-6SA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS108-6SA requirements.
6.How does Aetrix verify that ACS108-6SA is sourced from the original manufacturer or authorized distributors?
All ACS108-6SA 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 ACS108-6SA meets industry standards.
7.What is the process for return or replacement of ACS108-6SA?
All ACS108-6SA units undergo pre-shipment inspection (PSI). If there is an issue with ACS108-6SA, 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 ACS108-6SA part is unused and in its original packaging.
Return procedure for ACS108-6SA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACS108-6SA Tags
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