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STMicroelectronics ACS108-6SA-TR
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- Part No.:
- ACS108-6SA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ACS108-6SA-TR.pdf
- Description:
- TRIAC SENS GATE 600V 0.45A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
ACS108-6SA-TR 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+varistor solutions in low-power AC load control, enabling direct microcontroller interfacing without external protection components for solenoids, valves, lamps, and small motors in appliances and industrial controls.
For engineers reviewing the ACS108-6SA-TR datasheet, ACS108-6SA-TR pinout, ACS108-6SA-TR application, or ACS108-6SA-TR 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 shifter isolation - critical for reliable AC switching in noisy, inductive environments.
Technical Context
The ACS108-6SA-TR integrates an A.S.D.® (Advanced Static Discharge) structure that enables self-protecting turn-off clamping and IEC 61000-4-5 surge withstand via controlled avalanche crowbar action. Its gate-level shifter isolates digital controllers from mains-referenced switching paths while accepting negative gate current (IGT ≤ 10 mA) for triggering.
It operates in quadrants II and III, supports full-sine-wave conduction up to 0.8 A RMS at 64 °C ambient (S = 5 cm² heatsink), and maintains blocking capability (VDRM/VRRM = 600 V) after transient events - recovering at next zero-crossing without latch-up or degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 0.8 A RMS - maximum continuous AC load current with 76 °C lead temperature and adequate heatsinking |
| VDRM / VRRM | 600 V - peak repetitive blocking voltage in both directions, suitable for 230 VAC mains with safety margin |
| IGT | ≤10 mA - maximum negative gate trigger current required, enabling direct drive from MCU GPIO via 220 Ω resistor |
| VCL | ≥650 V - minimum clamping voltage before crowbar activation, absorbing inductive turn-off energy without external snubber |
| dV/dt immunity | ≥2000 V/μs at 125 °C - prevents false triggering from fast transients or ESD bursts in industrial environments |
| ITSM (20 ms) | 13 A - non-repetitive surge current rating, supporting short-circuit or motor-start transient handling |
| Rd | ≤300 mΩ at 125 °C - on-state dynamic resistance, limiting conduction loss to <0.3 W at 0.8 A RMS |
Pinout & Package
Package: TO-92 with common tab connection (COM pin electrically tied to metal tab), lead-free and halogen-free per ECOPACK® standards. Tab serves as thermal path and electrical reference for multi-switch mounting on shared heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Common reference terminal | Connected to AC mains neutral or ground; electrically bonded to TO-92 metal tab for thermal and electrical commonality |
| OUT | Switched output terminal | Connects to load (e.g., solenoid, lamp); carries full AC load current and sees clamped overvoltage during turn-off |
| G | Gate control input | Accepts negative current (≤10 mA) from MCU; internal level shifter isolates logic-side circuitry from mains-referenced COM/OUT |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | VCL ≥ 650 V enables safe turn-off of high-inductance loads (up to 15 H) without snubber or varistor |
| IEC 61000-4-5 compliance | Withstands ±2 kV line-to-line surges (per Figure 15 test circuit) - eliminates need for external MOVs or TVS diodes |
| Direct microcontroller interface | Negative-gate triggering (IGT ≤ 10 mA) allows single-series resistor (220 Ω) connection to 3.3 V/5 V GPIO |
| High noise immunity | dV/dt ≥ 2000 V/μs and burst immunity per IEC 61000-4-4 reduce false triggering in EMI-heavy industrial settings |
| Common-tab thermal design | TO-92 metal tab tied to COM enables parallel mounting of multiple ACS switches on one heatsink pad |
Applications
| Appliance Solenoid Control | Industrial Valve Actuation |
|---|---|
Use Scenario: Controlling water/gas solenoid valves in washing machines, dishwashers, and HVAC systems. IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relay; provides zero-crossing–free turn-on and controlled turn-off clamping. Use Value: Eliminates relay coil arcing and contact wear; VCL ≥ 650 V absorbs energy from >10 H solenoid inductance without snubber. |
Use Scenario: Driving pneumatic/hydraulic control valves in PLC-based factory automation panels. IC Role / Device Role / Timing Role: Solid-state AC switch interfaced directly to isolated digital outputs of industrial controllers. Use Value: Withstands 2 kV surges per IEC 61000-4-5 and maintains operation under 125 °C junction temperature in enclosed cabinets. |
| Resistive Lamp Dimming Interface | Small Fan/Motor On-Off Control |
Use Scenario: Mains-connected incandescent or halogen lamp switching in smart lighting modules. IC Role / Device Role / Timing Role: Low-noise, low-component-count AC switch with no audible buzz or EMI from snubbers. Use Value: Reduces BOM count by 80% vs. triac+RC snubber+MOV; dV/dt immunity prevents false turn-on from dimmer harmonics. |
Use Scenario: Cycling low-power AC fans or blowers (<0.8 A) in medical devices and ventilation units. IC Role / Device Role / Timing Role: Self-protected AC switch handling inductive kickback during abrupt shutdown. Use Value: Clamps turn-off overvoltage to ≤650 V and dissipates stored inductive energy internally - no external components needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-6S | No -TR suffix; supplied in bulk (2500 pcs), not tape-and-reel; identical electrical specs and TO-92 package | Suitable for manual prototyping or low-volume production where automated pick-and-place is not required | Select when reel packaging is unnecessary and cost-per-unit priority outweighs assembly-line compatibility |
| ACS108-6SA-AP | Identical specs; packaged in ammopack (2000 pcs) instead of tape-and-reel - same footprint and thermal performance | Preferred for selective soldering or hand-assembly workflows requiring component visibility and ease of access | Choose for repair depots, field-service kits, or pilot runs where tape-and-reel feeders are unavailable |
Compared with ACS108-6SA-TR, the bulk-packaged ACS108-6S reduces unit cost but lacks SMT compatibility, while the ammopack ACS108-6SA-AP offers identical reliability with better handling flexibility - all three share identical crowbar protection, gate drive, and thermal derating behavior.
Availability
ACS108-6SA-TR is available at Aetrix Electronics and suitable for appliance solenoid control, industrial valve actuation, and resistive lamp switching requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ACS108-6SA-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, MCU, and sensor solutions for automotive, industrial, 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, simplified drive, and thermal efficiency in compact packages like TO-92.
FAQ
What is the recommended gate resistor value for driving ACS108-6SA-TR from a 3.3 V MCU?
A 220 Ω resistor is specified in the datasheet (Figure 13) for 3.3 V MCU operation, delivering ~10 mA negative gate current - matching the maximum IGT rating while ensuring robust triggering across temperature and process variation. Lower values risk exceeding IGM (1 A peak), higher values may fail to guarantee turn-on at elevated junction temperatures.
Can ACS108-6SA-TR replace a standard triac in existing designs?
Yes, but only if the existing triac circuit lacks snubber or varistor protection and uses negative-gate triggering. ACS108-6SA-TR requires no external protection components and accepts negative gate current - unlike most triacs that require positive gate drive. Layout must accommodate COM-to-tab grounding and thermal pad mounting.
Does ACS108-6SA-TR support zero-crossing switching?
No - it is a random-phase AC switch. Turn-on occurs immediately upon gate current application, regardless of AC phase angle. Zero-crossing behavior is not inherent; external timing control (e.g., MCU zero-cross detection + delayed gate pulse) is required to achieve it.
What is the maximum inductance this device can safely switch off?
The datasheet validates clamping performance up to 15 H inductive loads (Section 2.1.1, Figure 14). Energy dissipation depends on VCL (≥650 V) and (dI/dt)c (≥2 A/ms); for a given L, safe turn-off requires IH < Iload at turn-off time and sufficient VCL headroom above peak mains voltage.
ACS108-6SA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for ACS108-6SA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS108-6SA-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 ACS108-6SA-TR reliable?
The price and inventory of ACS108-6SA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS108-6SA-TR is usually 5 days.
3.What payment methods are accepted for ACS108-6SA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS108-6SA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS108-6SA-TR?
ACS108-6SA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS108-6SA-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 ACS108-6SA-TR?
For technical support, including ACS108-6SA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS108-6SA-TR requirements.
6.How does Aetrix verify that ACS108-6SA-TR is sourced from the original manufacturer or authorized distributors?
All ACS108-6SA-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 ACS108-6SA-TR meets industry standards.
7.What is the process for return or replacement of ACS108-6SA-TR?
All ACS108-6SA-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACS108-6SA-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 ACS108-6SA-TR part is unused and in its original packaging.
Return procedure for ACS108-6SA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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