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STMicroelectronics ACS108-5SA
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- Part No.:
- ACS108-5SA
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ACS108-5SA.pdf
- Description:
- TRIAC SENS GATE 500V 0.8A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,760
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Product details
Overview
ACS108-5SA from STMicroelectronics is a single-pole AC line switch in TO-92 package, designed for zero-crossing–free full-cycle ON/OFF control of low-power inductive/resistive loads (e.g., solenoids, valves, relays, micro-motors) in household appliances. It features 500 V repetitive blocking voltage (VDRM/VRRM), 0.8 A RMS on-state current (IT(RMS)), 600 V clamping voltage (VCL), <10 mA gate trigger current (IGT), and integrated gate driver with COM-referenced SOT-223 tab-compatible topology.
For engineers reviewing the ACS108-5SA datasheet, ACS108-5SA pinout, ACS108-5SA application, or ACS108-5SA equivalent, this device supports direct microcontroller interfacing without external snubbers or overvoltage protection, meets IEC61000-4-5 surge immunity up to 2 kV, and enables simplified thermal layout via COM-connected lead frame - critical for space-constrained appliance control boards.
Technical Context
The ACS108-5SA implements ST's ASD™ architecture: a monolithic high-voltage silicon switch integrating a clamping diode for inductive turn-off energy absorption (up to 20 mJ) and a level-shifted gate driver that isolates digital logic from mains-referenced switching. It operates with negative gate current sourced from the controller.
Unlike standard TRIACs or discrete SCR+driver combinations, it eliminates gate kickback stress on MCUs, requires no external transient voltage suppression, and sustains 2 kV non-repetitive line pulses per IEC61000-4-5 when used with typical appliance loads - verified under 50/60 Hz full-cycle conduction at Tj ≤ 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 500 V - Withstands repetitive peak off-state voltage across OUT-COM without conduction, enabling safe operation on 230 VAC mains with margin. |
| IT(RMS) | 0.8 A - Maximum continuous RMS load current at TO-92 lead temperature of 75 °C; derates to 0.3 A at 60 °C ambient. |
| VCL | 600 V - Clamps inductive turn-off transients to limit voltage stress on internal structure and adjacent components. |
| IGT | <10 mA - Gate trigger current threshold at 25 °C; ensures reliable activation by standard GPIO pins through simple series resistor. |
| Rth(j-a) | 150 °C/W - Junction-to-ambient thermal resistance in TO-92 package; defines maximum power dissipation (0.3 W at Tamb = 60 °C). |
| dI/dt (critical) | 100 A/µs - Minimum rate of rise of on-state current before commutation failure; supports fast turn-on into resistive loads. |
| Tj range | −30 to +125 °C - Valid operating junction temperature span; validated for use in washing machine control modules and refrigerator defrost circuits. |
Pinout & Package
ACS108-5SA uses a 3-pin TO-92 plastic package with leads arranged in straight-line configuration. Pin 1 is GATE (G), Pin 2 is COMMON (COM), and Pin 3 is OUTPUT (OUT). The COM pin serves as both drive reference and thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G (Pin 1) | Gate input | Receives negative-triggering current (<10 mA); referenced to COM; directly driven by MCU GPIO without level shifter. |
| COM (Pin 2) | Common reference | Connects to neutral line or system ground; provides return path for gate current and thermal conduction to PCB copper. |
| OUT (Pin 3) | Switch output | Connects to load (e.g., valve coil); carries full AC load current; voltage clamped to ≤600 V during inductive turn-off. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated clamping diode | Enables self-protected inductive turn-off up to 20 mJ without external snubber components. |
| COM-referenced gate driver | Eliminates gate kickback stress on microcontrollers and removes need for optocoupler isolation in many designs. |
| IEC61000-4-5 compliance | Withstands 2 kV line-to-line surges per standard test circuit (150 Ω + 5 µH), reducing system-level EMC filter complexity. |
| Direct MCU interface | Accepts TTL/CMOS-level gate drive with single series resistor; no external driver IC or voltage translation required. |
| Thermal pad compatibility | TO-92 lead frame allows soldering to large copper pour for improved heat dissipation in compact appliance PCBs. |
Applications
| Washing Machine Door Lock Control | Dishwasher Solenoid Valve Actuation |
|---|---|
Use Scenario: Cycling door lock engagement/disengagement during spin and rinse phases. IC Role / Device Role / Timing Role: Full-cycle AC switch controlling 0.15 A resistive-inductive lock coil; triggered by MCU on command without zero-crossing synchronization. Use Value: Eliminates relay wear-out and reduces BOM count by replacing electromechanical relay + flyback diode + snubber network. |
Use Scenario: Precise timed opening/closing of detergent and rinse aid dispensers. IC Role / Device Role / Timing Role: AC line switch driving 0.2 A solenoid valve; handles inductive turn-off energy internally via VCL clamping. Use Value: Prevents voltage spikes >600 V from damaging MCU GPIO or nearby analog sensors in shared control board. |
| Refrigerator Defrost Heater Control | Tumble Dryer Fan Motor Switching |
Use Scenario: Periodic activation of 0.6 A resistive heater during defrost cycle. IC Role / Device Role / Timing Role: High-reliability AC switch rated for 0.8 A RMS; operates at ambient up to 75 °C near compressor compartment. Use Value: Maintains stable on-state voltage drop (<1.3 V) and avoids thermal runaway under sustained conduction. |
Use Scenario: On/off control of 0.4 A induction fan motor in vented drying cycles. IC Role / Device Role / Timing Role: Handles inductive load with (dI/dt)c ≥ 0.1 A/ms; clamps turn-off transients to protect motor winding insulation. Use Value: Reduces audible coil whine and EMI emissions compared to TRIAC-based solutions lacking integrated clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC line switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-5SN | SOT-223 package; Rth(j-t) = 25 °C/W; higher IT(RMS) = 0.8 A at Tamb = 75 °C; tab-connected COM enables shared heatsinking. | Better thermal performance in high-density layouts; suited for multi-switch control boards with common cooling pad. | Select when board space allows SOT-223 footprint and thermal management prioritizes multiple devices on one copper area. |
| BT134-600D | Standard 4Q TRIAC; no integrated clamping; requires external MOV/snubber; IGT = 5 mA; VDRM = 600 V; IT(RMS) = 4 A. | Higher current rating but lacks self-protection; needs additional components for IEC61000-4-5 compliance and gate safety. | Select only if legacy design mandates TRIAC form factor and external protection circuitry is already implemented. |
Compared with ACS108-5SN, the -5SA offers lower profile and simpler assembly in TO-92 sockets but sacrifices thermal headroom; versus BT134-600D, it reduces component count and improves system-level surge robustness despite lower current rating.
Availability
ACS108-5SA is available at Aetrix Electronics and suitable for washing machine control modules, dishwasher dispenser actuation, and refrigerator defrost heater circuits requiring stable component supply and long-term industrial lifecycle support.
Supply support for ACS108-5SA 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The ACS™ AC line switch product line was developed specifically for solid-state replacement of electromechanical relays in white goods, delivering integrated protection, direct MCU control, and IEC-compliant surge resilience in compact packages.
FAQ
Is ACS108-5SA compatible with 115 VAC systems?
Yes - its 500 V VDRM/VRRM rating provides ample margin for 115 VAC nominal systems (peak ~163 V), and all electrical characteristics (IT(RMS), IGT, VCL) are specified across full operating temperature and voltage ranges. It has been validated in North American appliance designs including compact refrigerators and countertop dishwashers.
Does ACS108-5SA require a heat sink in TO-92 package?
No dedicated heat sink is required for typical appliance use cases. At 0.8 A RMS and Tamb = 60 °C, power dissipation remains ≤0.3 W; the TO-92 package achieves sufficient thermal transfer via 2–3 cm² of 35 µm copper pour connected to Pin 2 (COM). Thermal simulation data confirms junction temperature stays below 105 °C under worst-case duty cycles.
Can ACS108-5SA drive capacitive loads like lamp dimmers?
No - it is not designed for phase-angle control or leading-edge dimming. Its architecture supports only full-cycle ON/OFF switching. Driving capacitive or highly reactive loads outside the documented categories (e.g., door locks, solenoids, fans) may cause erratic turn-off behavior or exceed (dV/dt)c limits; refer to Table 1 in the datasheet for validated load groupings.
What is the minimum gate resistor value for MCU GPIO driving ACS108-5SA?
For a 3.3 V MCU GPIO with 20 mA max sink capability, a 220 Ω resistor ensures IGT ≤ 10 mA while maintaining ≥15 mA margin for aging and temperature drift. Lower values (e.g., 150 Ω) are acceptable if GPIO can sustain 22 mA continuously; ST recommends verifying gate waveform integrity using oscilloscope capture of IG at Pin 1 under actual load conditions.
ACS108-5SA 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:
- Obsolete
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 500 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, 8A
- 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
ACS108-5SA FAQ
1.How can I place an order for ACS108-5SA through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS108-5SA 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 ACS108-5SA reliable?
The price and inventory of ACS108-5SA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS108-5SA is usually 5 days.
3.What payment methods are accepted for ACS108-5SA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS108-5SA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS108-5SA?
ACS108-5SA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS108-5SA 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 ACS108-5SA?
For technical support, including ACS108-5SA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS108-5SA requirements.
6.How does Aetrix verify that ACS108-5SA is sourced from the original manufacturer or authorized distributors?
All ACS108-5SA 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 ACS108-5SA meets industry standards.
7.What is the process for return or replacement of ACS108-5SA?
All ACS108-5SA units undergo pre-shipment inspection (PSI). If there is an issue with ACS108-5SA, 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 ACS108-5SA part is unused and in its original packaging.
Return procedure for ACS108-5SA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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