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STMicroelectronics ACST8-8CG
- Part No.:
- ACST8-8CG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST8-8CG.pdf
- Description:
- TRIAC 800V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
ACST8-8CG from STMicroelectronics is an overvoltage-protected AC power switch based on ASD™ triac topology, designed for bidirectional full-cycle switching of inductive loads up to 8A RMS at 90°C case temperature. It features 800V repetitive peak off-state voltage (VDRM/VRRM), avalanche-controlled clamping (VCL = 1200V typ.), and snubberless turn-off commutation (dI/dt)c ≥ 4.5 A/ms - enabling direct control of refrigerator compressors and washing machine bi-rotational induction motors without external transient protection.
For engineers reviewing the ACST8-8CG datasheet, ACST8-8CG pinout, ACST8-8CG application, or ACST8-8CG equivalent, this device is selected for robust AC line switching where IEC61000-4-5 compliance, high dV/dt immunity (>750 V/µs), gate-triggering simplicity (IGT ≤ 30 mA), and thermal reliability in D2PAK packages are critical design requirements.
Technical Context
The ACST8-8CG integrates a planar triac structure with monolithic avalanche voltage clamping, allowing safe absorption of inductive turn-off energy and line transients per IEC61000-4-5 (2 kV pulse). Its gate is triggered by negative current flow from controller to pin G, supporting direct low-voltage MCU interfacing via series resistor.
It operates in full-cycle ON/OFF or phase-angle control modes, with inherent immunity to false triggering due to static dV/dt > 750 V/µs at 125°C and holding current IH ≤ 40 mA. Thermal performance is defined by Rth(j-c) = 2.5 °C/W and Rth(j-a) = 45 °C/W (on 1 cm² copper pad), enabling 8A conduction without heatsink in constrained industrial appliance layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | ±800 V - Withstands repetitive AC line peaks up to 240 V RMS + margin; eliminates need for external MOVs in EN61000-4-5 Level 3 systems. |
| IT(RMS) | 8 A at Tcase = 100°C - Supports continuous motor drive in refrigerator compressors and washing machine drum motors without forced cooling. |
| (dI/dt)c | ≥4.5 A/ms - Enables snubberless turn-off commutation for inductive loads, reducing BOM count and PCB area. |
| Static dV/dt | >750 V/µs at 125°C - Prevents spurious turn-on during fast line transients or capacitor discharge events. |
| IGT | ≤30 mA at VOUT = 12 V - Compatible with standard GPIO or optocoupler outputs without gate driver ICs. |
| VCL | 1200 V typ. at ICL = 1 mA - Clamps inductive kickback energy, protecting against destructive avalanche failure during motor shutdown. |
| Rth(j-c) | 2.5 °C/W - Enables efficient heat transfer to heatsink or metal-core PCB, supporting high-power density designs. |
Pinout & Package
D2PAK (TO-263) package: surface-mount, isolated tab, 3-pin outline with exposed thermal pad; footprint matches JEDEC MS-013AC, weight 1.5 g, UL94 V0 epoxy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Common reference terminal | Connected to AC line neutral; defines return path for load current and gate trigger reference. |
| OUT | Switch output terminal | Connected to motor/compressor load; carries full 8A RMS bidirectional current; voltage polarity relative to COM determines conduction quadrant. |
| G | Gate control input | Receives negative gate current (≤30 mA) from controller to initiate conduction; no positive gate drive required. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche voltage clamping | VCL = 1200 V typ. absorbs inductive turn-off energy, eliminating snubber networks and improving system reliability. |
| High noise immunity | Static dV/dt > 750 V/µs at 125°C prevents false triggering in electrically noisy appliance environments (e.g., compressor startup). |
| Snubberless commutation | (dI/dt)c ≥ 4.5 A/ms enables clean zero-current turn-off without RC snubbers - reduces component count and EMI. |
| Planar junction technology | Ensures stable off-state leakage (IDRM ≤ 1 µA at 125°C) and long-term reliability under thermal cycling in home appliances. |
| IEC61000-4-5 compliant ruggedness | Withstands 2 kV line-to-line surge pulses (10× polarity) without degradation - meets EN61000-4-5 for Class 3 equipment. |
Applications
| Refrigerator Compressor Drive | Washing Machine Bi-Rotational Motor |
|---|---|
|
Use Scenario: Continuous-duty AC induction motor control in sealed refrigeration systems requiring silent, reliable on/off cycling. IC Role / Device Role / Timing Role: AC power switch performing full-cycle conduction to energize compressor windings; gate triggered once per half-cycle by microcontroller. Use Value: Eliminates need for external overvoltage protection and snubber components while sustaining 8A RMS at ambient temperatures up to 70°C. |
Use Scenario: Bidirectional tumble drum rotation using phase-shift capacitor and dual ACST switches in domestic washing machines. IC Role / Device Role / Timing Role: One ACST8-8CG conducts per half-cycle to define motor direction; gate driven with negative current pulse synchronized to zero-crossing. Use Value: High dV/dt immunity prevents misfiring during capacitor discharge transients; snubberless operation simplifies dual-switch layout. |
| Air Conditioning Compressor | Dishwasher Drain Pump Control |
|
Use Scenario: High-reliability motor switching in split-system AC units exposed to outdoor line surges and thermal stress. IC Role / Device Role / Timing Role: Primary AC line switch isolating compressor from mains; activated/deactivated based on thermostat demand signals. Use Value: 2 kV IEC61000-4-5 surge withstand capability ensures field durability without additional transient suppressors. |
Use Scenario: Intermittent 8A load switching for high-torque drain pump motors in compact dishwasher chassis. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays; controlled via 3.3V/5V MCU GPIO through current-limiting resistor. Use Value: D2PAK thermal resistance (Rth(j-a) = 45 °C/W on 1 cm² copper) enables convection-cooled operation in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST8-8CT | TO-220AB package; Rth(j-c) = 2.5 °C/W same, but Rth(j-a) = 60 °C/W (no copper pad); heavier (2.3 g). | Suitable for through-hole assembly with bolt-down heatsinking; less optimal for high-density SMT layouts. | Select when mechanical mounting stability or legacy board compatibility outweighs SMT efficiency. |
| ACST8-8CFP | TO-220FPAB package; Rth(j-c) = 3.5 °C/W; Rth(j-a) = 60 °C/W; isolated tab; 2.4 g. | Preferred for insulated heatsink mounting in industrial controls where creepage/clearance > 4 mm required. | Choose when electrical isolation between switch and heatsink is mandatory per safety standards. |
Compared with ACST8-8CT and ACST8-8CFP, the ACST8-8CG offers superior thermal performance in surface-mount configurations (Rth(j-a) = 45 °C/W on copper pad), smaller footprint, and lower weight - making it optimal for modern, high-density appliance PCBs where automated assembly and thermal management are prioritized.
Availability
ACST8-8CG is available at Aetrix Electronics and suitable for refrigerator compressor drives, washing machine motor controls, air conditioning systems, and dishwasher pump modules requiring stable component supply across multi-year production cycles.
Supply support for ACST8-8CG 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 microcontrollers for industrial, automotive, and consumer markets.
The ACST series belongs to ST's ASD™ (AC Switch) family, engineered specifically for robust, snubberless AC power control in white goods - emphasizing surge resilience, thermal efficiency, and simplified gate drive in cost-sensitive, high-volume appliance applications.
FAQ
What is the maximum allowable gate trigger current for ACST8-8CG?
The peak gate current (IGM) is rated at 1 A for 20 µs pulses, but the DC or average gate triggering current must remain ≤30 mA under normal operating conditions (VOUT = 12 V, RL = 33 Ω, Tj = 25°C). Exceeding 30 mA continuously risks gate degradation; typical designs use 10–20 mA with a series resistor.
Can ACST8-8CG replace a mechanical relay in washing machine motor control?
Yes - it supports full-cycle switching of bi-rotational induction motors up to 8A RMS, with proven reliability in EN61000-4-5 surge environments and no contact wear. Its snubberless (dI/dt)c ≥ 4.5 A/ms and dV/dt > 750 V/µs eliminate common relay failure modes like arcing and coil burnout.
Does ACST8-8CG require a heatsink in refrigerator compressor applications?
At 8A RMS and Tcase = 100°C, the D2PAK package achieves thermal equilibrium with Rth(j-a) = 45 °C/W on a 1 cm² copper pad - meaning no external heatsink is needed if PCB layout provides adequate copper area and natural convection. For sustained 8A at >70°C ambient, a small clip-on heatsink improves margin.
How does the avalanche clamping function protect the device during motor turn-off?
During inductive turn-off, stored energy in the motor winding generates reverse voltage across OUT–COM. The integrated clamping structure activates at VCL ≈ 1200 V, diverting current internally to limit voltage rise and absorb energy - preventing destructive breakdown that would occur in standard triacs without external snubbers.
ACST8-8CG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ASD™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Obsolete
- Triac Type:
- Standard
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 80A, 85A
- Current - Gate Trigger (Igt) (Max):
- 30 mA
- Current - Hold (Ih) (Max):
- 40 mA
- Configuration:
- Single
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
ACST8-8CG FAQ
1.How can I place an order for ACST8-8CG through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST8-8CG 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 ACST8-8CG reliable?
The price and inventory of ACST8-8CG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST8-8CG is usually 5 days.
3.What payment methods are accepted for ACST8-8CG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST8-8CG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST8-8CG?
ACST8-8CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST8-8CG 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 ACST8-8CG?
For technical support, including ACST8-8CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST8-8CG requirements.
6.How does Aetrix verify that ACST8-8CG is sourced from the original manufacturer or authorized distributors?
All ACST8-8CG 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 ACST8-8CG meets industry standards.
7.What is the process for return or replacement of ACST8-8CG?
All ACST8-8CG units undergo pre-shipment inspection (PSI). If there is an issue with ACST8-8CG, 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 ACST8-8CG part is unused and in its original packaging.
Return procedure for ACST8-8CG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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