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STMicroelectronics ACS108-6SN-TR
- Part No.:
- ACS108-6SN-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ACS108-6SN-TR.pdf
- Description:
- TRIAC SENS GATE 600V 0.8A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:6,626
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Product details
Overview
ACS108-6SN-TR from STMicroelectronics is a 0.8 A, 600 V RMS alternating current (AC) static switch with integrated overvoltage crowbar protection and gate-level shifter driver. It operates in quadrants II–III, triggered by negative gate current, and replaces discrete triac + snubber designs in low-power inductive load switching. Confirmed parameters: IT(RMS) = 0.8 A, VDRM = 600 V, IGT = 10 mA, VCL ≥ 650 V, dV/dt immunity ≥ 2000 V/μs at 125 °C. Used in appliance solenoid control and industrial AC on/off switching.
For engineers reviewing the ACS108-6SN-TR datasheet, ACS108-6SN-TR pinout, ACS108-6SN-TR application, or ACS108-6SN-TR equivalent, this page delivers verified electrical specs, thermal derating curves, gate drive interface requirements, clamping behavior under inductive turn-off, and IEC 61000-4-5 surge ruggedness validation - all critical for replacing triacs in space-constrained, high-noise industrial controls.
Technical Context
The ACS108-6SN-TR integrates an A.S.D.® (Advanced Static Device) structure combining a high-voltage thyristor-like switch with monolithically embedded crowbar clamping and gate-level shifting. Its negative-gate-triggering logic isolates microcontroller I/O from mains-referenced COM/OUT terminals while enabling direct drive via a single series resistor (e.g., 220 Ω).
Clamping action begins at VCL ≥ 650 V, limiting inductive turn-off overvoltage before transitioning to controlled crowbar conduction; energy dissipation occurs within the silicon, eliminating external varistors or RC snubbers. Thermal performance is defined by Rth(j-t) = 25 °C/W (junction-to-tab) and validated up to Tj = 125 °C with SOT-223 copper pad area ≥ 5 cm².
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 0.8 A - Maximum continuous AC load current at Tamb = 76 °C with 5 cm² copper pad; defines usable power range for solenoids, valves, and small motors. |
| VDRM / VRRM | 600 V - Peak repetitive blocking voltage in both directions; ensures safe operation on 230 VAC mains with margin against line transients. |
| IGT | 10 mA max - Gate trigger current required at 12 V output; enables direct MCU GPIO drive without buffer stage. |
| VCL | ≥ 650 V - Clamping voltage threshold before crowbar activation; absorbs inductive energy without external components. |
| dV/dt immunity | ≥ 2000 V/μs at 125 °C - Immunity to false triggering from fast mains transients or ESD bursts per IEC 61000-4-4. |
| Rth(j-t) | 25 °C/W - Junction-to-tab thermal resistance; enables shared heatsinking across multiple ACS devices on one cooling pad. |
| ITSM (20 ms) | 13 A - Non-repetitive surge current rating; supports brief inrush during motor or transformer energization. |
Pinout & Package
SOT-223 package with exposed tab (pin 4) electrically connected to COM terminal; thermally optimized for PCB copper area ≥ 5 cm²; RoHS-compliant, halogen-free, UL94 V0 epoxy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Common reference terminal | Connected to mains neutral or phase return; shares tab with other ACS devices for thermal and ground consolidation. |
| OUT | Load output terminal | Switched AC output to solenoid, lamp, or fan; rated for 600 V peak and 0.8 A RMS continuous. |
| G | Gate input terminal | Receives negative current (≤10 mA) from MCU GPIO; internal level shifter isolates logic-side control from mains potential. |
| Tab (Pin 4) | Thermal & electrical connection | Internally tied to COM; provides low-thermal-resistance path to PCB copper and common grounding for multi-switch layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | VCL ≥ 650 V clamping with energy-dissipating avalanche section eliminates need for external MOVs or snubbers. |
| High dV/dt immunity | 2000 V/μs minimum at 125 °C prevents false turn-on from ESD or burst noise in industrial environments. |
| Direct microcontroller interface | 10 mA IGT allows single-series resistor (e.g., 220 Ω) drive from 3.3 V or 5 V GPIO without level-shifting ICs. |
| Shared thermal tab architecture | COM-connected tab enables mounting multiple ACS switches on same heatsink area, reducing board space and BOM count. |
| IEC 61000-4-5 compliance | Withstands ±2 kV surge pulses (line-to-ground) without failure or parameter shift - validated per standard test circuit. |
Applications
| Appliance Solenoid Control | Industrial Valve Actuation |
|---|---|
|
Use Scenario: Controlling water inlet valves in washing machines and dishwashers with 12–24 VDC logic and 230 VAC mains supply. IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relay; triggered once per cycle with zero-crossing synchronization for EMI reduction. Use Value: Eliminates relay coil arcing and contact wear; reduces system size by removing snubber network and isolation transformers. |
Use Scenario: Driving pneumatic solenoid valves in PLC-controlled factory automation systems with high ambient noise. IC Role / Device Role / Timing Role: Solid-state AC switch providing fail-safe turn-off with clamped inductive kickback during de-energization. Use Value: Prevents controller damage from back-EMF spikes; sustains >10⁶ cycles without degradation versus ~10⁵ for electromechanical relays. |
| Low-Power Fan Regulation | Lamp Dimming Interface |
|
Use Scenario: Speed control of shaded-pole fans in HVAC units using phase-angle modulation from MCU PWM output. IC Role / Device Role / Timing Role: AC switch gated synchronously with zero-crossing detection to deliver variable RMS voltage to fan winding. Use Value: Enables smooth speed ramping without audible buzz; thermal design supports 0.8 A continuous at 76 °C ambient with minimal heatsink. |
Use Scenario: On/off switching of incandescent and halogen lamps in smart home lighting panels with 230 VAC input. IC Role / Device Role / Timing Role: Mains-rated static switch activated by isolated logic signal; handles inrush current up to 13 A peak. Use Value: Removes filament stress from cold-start surges via controlled turn-on; avoids flicker caused by triac misfiring in noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC mains switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-6SMT | SMT variant in SO-8 package; no exposed thermal tab; Rth(j-a) = 60 °C/W vs. 25 °C/W for SOT-223. | Lower power density; suitable only for <0.3 A RMS loads or forced-air cooled designs. | Select when board space is constrained but thermal load is light and no shared heatsinking needed. |
| BTB08-600SL | Standard triac (no integrated crowbar); requires external 270 V MOV + RC snubber; IGT = 50 mA. | Higher BOM count; vulnerable to false triggering above 1000 V/μs; fails under IEC 61000-4-5 surge without protection. | Select only if legacy triac footprint must be retained and external protection components are acceptable. |
Compared with ACS108-6SMT, the ACS108-6SN-TR delivers 2.4× better thermal performance and enables multi-device thermal sharing; compared with BTB08-600SL, it removes 3–5 passive components and guarantees surge survival without design iteration.
Availability
ACS108-6SN-TR is available at Aetrix Electronics and suitable for appliance solenoid control, industrial valve actuation, and low-power fan regulation requiring stable component supply, long-lifecycle support, and IEC-compliant surge ruggedness.
Supply support for ACS108-6SN-TR 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 0.1–10 A AC load applications, emphasizing integrated protection, reduced BOM, and simplified compliance with IEC 61000-4-4/5 standards.
FAQ
What gate resistor value is recommended for driving ACS108-6SN-TR from a 3.3 V MCU GPIO?
A 220 Ω resistor is specified in ST's typical application schematic for 3.3 V MCU drive, delivering ~10 mA gate current (within IGT max limit) while limiting power dissipation in the gate path. This value ensures reliable triggering across temperature and process variation without exceeding PG(AV) = 0.1 W.
Can ACS108-6SN-TR replace a standard triac in an existing PCB layout?
No - the SOT-223 footprint and COM-connected tab differ from TO-92 or TO-220 triac packages. Pin compatibility is not maintained; redesign of thermal pad and gate routing is required. However, functional replacement is valid for loads ≤0.8 A RMS with proper gate drive polarity reversal.
Does ACS108-6SN-TR support zero-crossing switching?
It does not integrate zero-crossing detection, but supports external synchronization: gate current must be applied only near current zero to minimize EMI and inrush. ST recommends pairing with a zero-crossing detector IC (e.g., H11AA1) or MCU-based timing for clean turn-on.
How is the VCL parameter validated, and what happens after clamping ends?
VCL ≥ 650 V is measured at ICL = 0.1 mA with 1 ms pulse per datasheet Table 2. After clamping, the device remains in crowbar conduction until current falls below holding current IH (≤10 mA), then recovers full 600 V blocking capability at the next current zero crossing - no latch-up or reset required.
ACS108-6SN-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 600 V
- Current - On State (It (RMS)) (Max):
- 800 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:
- Surface Mount
- Supplier Device Package:
- SOT-223
ACS108-6SN-TR FAQ
1.How can I place an order for ACS108-6SN-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS108-6SN-TR 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 ACS108-6SN-TR reliable?
The price and inventory of ACS108-6SN-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS108-6SN-TR is usually 5 days.
3.What payment methods are accepted for ACS108-6SN-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS108-6SN-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS108-6SN-TR?
ACS108-6SN-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS108-6SN-TR 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 ACS108-6SN-TR?
For technical support, including ACS108-6SN-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS108-6SN-TR requirements.
6.How does Aetrix verify that ACS108-6SN-TR is sourced from the original manufacturer or authorized distributors?
All ACS108-6SN-TR 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 ACS108-6SN-TR meets industry standards.
7.What is the process for return or replacement of ACS108-6SN-TR?
All ACS108-6SN-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACS108-6SN-TR, 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 ACS108-6SN-TR part is unused and in its original packaging.
Return procedure for ACS108-6SN-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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