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STMicroelectronics ACST310-8BTR
- Part No.:
- ACST310-8BTR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ACST310-8BTR.pdf
- Description:
- TRIAC SENS GATE 800V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,957
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Product details
Overview
ACST310-8BTR from STMicroelectronics is a self-protected AC switch (Triac-based A.S.D.® device) designed for direct microcontroller-driven AC load control in appliances and industrial systems. It delivers 3 A RMS on-state current, 800 V blocking voltage (VDRM/VRRM), 10 mA max gate trigger current (IGT), and integrated overvoltage clamping (VCL ≥ 850 V) compliant with IEC 61000-4-5. Used in fan speed controllers, water valves, and solid-state relays.
For engineers reviewing the ACST310-8BTR datasheet, ACST310-8BTR pinout, ACST310-8BTR application, or ACST310-8BTR equivalent, this page provides verified technical context, DPAK package details, IEC-compliant transient immunity specs, and real-world implementation guidance for inductive/resistive AC switching without external protection.
Technical Context
The ACST310-8BTR integrates a Triac structure with an internal high-voltage crowbar clamping circuit that activates at ≥850 V to safely absorb inductive turn-off energy and withstand 2 kV line transients per IEC 61000-4-5. Its three-quadrant operation (Q1/Q2/Q3) enables phase-angle control and zero-crossing switching.
It achieves high noise immunity via dV/dt ≥ 1000 V/µs at 125 °C - 5–10× higher than standard Triacs of comparable sensitivity - while maintaining low gate drive requirements (IGT ≤ 10 mA, VGT ≤ 1.1 V), enabling direct logic-level interfacing with no buffer stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 3 A - Sustains continuous AC load current up to 3 A RMS without heatsink under Tc = 112 °C |
| VDRM / VRRM | 800 V - Blocks 800 V peak AC line voltage in both directions, suitable for 230 VAC mains |
| IGT (Q1/Q2/Q3) | 10 mA max - Enables direct drive from MCU GPIO via single series resistor (e.g., 1.2 kΩ @ 12 V) |
| VCL | ≥850 V - Internal clamping voltage ensures automatic crowbar protection against IEC 61000-4-5 surges |
| dV/dt | ≥1000 V/µs @ 125 °C - Prevents false triggering from fast transients (IEC 61000-4-4 compliant) |
| Rth(j-c) | 3 °C/W - Low thermal resistance enables efficient heat transfer to PCB copper pad or heatsink |
| IL (latching) | 25 mA max (Q1/Q3), 35 mA max (Q2) - Ensures reliable turn-on retention after gate pulse removal |
Pinout & Package
DPAK (TO-252) package with exposed metal tab (COM terminal) for thermal and electrical connection; UL94-V0 epoxy, lead-free, halogen-free; footprint per Figure 21 (ST DocID030200 Rev 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 (Main Terminal 1) | AC load return path | Connected to neutral or low-side AC line; forms main current path with MT2 |
| MT2 (Main Terminal 2) | AC load hot-side connection | Connected to AC line input; carries full load current; electrically tied to tab (COM) |
| G (Gate) | Trigger control input | Low-current (≤10 mA) logic-compatible input; triggers conduction in all three quadrants |
| Tab (COM) | Common terminal / thermal pad | Internally connected to MT2; must be soldered to large copper area for thermal management and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Self overvoltage protection | Integrated crowbar clamping (VCL ≥ 850 V) eliminates need for external MOVs or snubbers in IEC 61000-4-5 designs |
| Three-quadrant operation | Enables robust phase-angle control and zero-crossing switching for inductive loads without commutation issues |
| Microcontroller direct drive | 10 mA max IGT allows GPIO interface with only one current-limiting resistor - reduces BOM count by ≥2 components |
| High dV/dt immunity | 1000 V/µs rating at 125 °C prevents spurious turn-on in noisy industrial environments (e.g., motor drives, solenoid controls) |
| UL94-V0 & ECOPACK®2 | Flame-retardant resin and RoHS/halogen-free compliance support safety-certified appliance and industrial end-equipment |
Applications
| Fan Speed Control | Water Valve Actuation |
|---|---|
Use Scenario: Variable-speed AC fan in HVAC or kitchen hood requiring smooth RPM adjustment and EMI-safe switching. IC Role / Device Role / Timing Role: AC switch controlling phase-angle power delivery to universal motor; replaces mechanical relay and external snubber. Use Value: Eliminates contact wear, reduces acoustic noise, and meets IEC 61000-4-4/4-5 immunity without added protection components. | Use Scenario: On/off control of solenoid-operated water valves in washing machines or dishwashers. IC Role / Device Role / Timing Role: High-reliability AC static switch driving highly inductive solenoid coil; handles 3 A inrush and inductive kickback. Use Value: Withstands repeated 2 kV transients during valve de-energization; no external clamping required per IEC 61000-4-5. |
| Solid-State Relay Module | Resistive Load Dimming |
Use Scenario: Compact SSR replacement in PLC output modules or industrial panel interfaces. IC Role / Device Role / Timing Role: Isolation-free AC switching element with built-in surge protection; mounted directly on PCB with copper heatsinking. Use Value: Achieves >10⁶ operations lifetime vs. <10⁵ for electromechanical relays; reduces board space by 40% versus discrete Triac + MOV solution. | Use Scenario: Dimmable lighting control for incandescent/halogen bulbs in smart home fixtures. IC Role / Device Role / Timing Role: Phase-controlled AC switch delivering adjustable RMS voltage to resistive filament load. Use Value: Maintains stable dimming across temperature (−40 to +125 °C junction) with no gate drive drift due to IGT variation <5% over range. |
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 | Lower IT(RMS) = 0.8 A; 600 V VDRM; no integrated overvoltage clamping | Requires external MOV/snubber for IEC 61000-4-5 compliance; limited to low-power loads | Select when cost-sensitive, low-current (<1 A) applications allow external protection |
| BTB08-600SL | Higher IT(RMS) = 8 A; 600 V VDRM; standard Triac (no self-protection); IGT = 35 mA | Needs gate driver buffer; lacks crowbar function - requires full external surge protection network | Select for high-current, non-safety-critical industrial loads where external protection is already implemented |
Compared with ACS108-6S and BTB08-600SL, the ACST310-8BTR uniquely combines 3 A rating, 800 V blocking, and certified self-protection - reducing system-level component count, PCB area, and qualification effort for IEC-compliant appliance designs.
Availability
ACST310-8BTR is available at Aetrix Electronics and suitable for fan speed controllers, water valve actuators, solid-state relay modules, and resistive load dimming systems requiring stable component supply and long-term industrial availability.
Supply support for ACST310-8BTR 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The ACST/ACST family uses A.S.D.® (Application Specific Discrete) technology to deliver integrated protection and control functions in discrete power switches - targeting high-reliability, low-BOM AC load control in white goods and industrial automation.
FAQ
What is the maximum allowable gate resistor value for direct MCU drive?
The maximum gate resistor is determined by VDD, VGT(max), and IGT(max). At 3.3 V MCU output and 10 mA IGT limit, Rg ≤ (3.3 V − 1.1 V)/10 mA = 220 Ω. For 5 V drive, Rg ≤ 390 Ω. Lower values improve noise immunity but increase MCU current draw; ST recommends 220–470 Ω for robust operation.
Can ACST310-8BTR replace a standard Triac in existing designs?
Yes, with layout and drive adjustments. Pin-compatible with DPAK Triacs, but its COM tab connects internally to MT2 - requiring PCB copper tie to MT2 net. Gate drive remains compatible (same IGT spec), but external snubbers/MOVs can be removed due to integrated clamping, simplifying redesign.
Does the device require heatsinking for 3 A RMS operation?
At Tc = 112 °C, no external heatsink is needed if the PCB provides ≥2 cm² of 2-oz copper connected to the tab. Thermal resistance is Rth(j-c) = 3 °C/W; with 25 °C ambient and 1.8 V on-state drop, power dissipation is ~5.4 W, yielding ~16 °C rise above case - well within 125 °C junction limit.
How many IEC 61000-4-5 surges can ACST310-8BTR withstand?
The device is rated for ≥10 non-repetitive 2 kV surges (per polarity) under IEC 61000-4-5 test conditions (R = 30 Ω, L = 10 µH, tp = 1.2/50 µs). After each event, it fully recovers blocking capability at the next zero-crossing - verified in ST's production testing per DocID030200 Rev 1.
ACST310-8BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 3 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 20A, 21A
- Current - Gate Trigger (Igt) (Max):
- 10 mA
- Current - Hold (Ih) (Max):
- 20 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
ACST310-8BTR FAQ
1.How can I place an order for ACST310-8BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST310-8BTR 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 ACST310-8BTR reliable?
The price and inventory of ACST310-8BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST310-8BTR is usually 5 days.
3.What payment methods are accepted for ACST310-8BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST310-8BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST310-8BTR?
ACST310-8BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST310-8BTR 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 ACST310-8BTR?
For technical support, including ACST310-8BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST310-8BTR requirements.
6.How does Aetrix verify that ACST310-8BTR is sourced from the original manufacturer or authorized distributors?
All ACST310-8BTR 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 ACST310-8BTR meets industry standards.
7.What is the process for return or replacement of ACST310-8BTR?
All ACST310-8BTR units undergo pre-shipment inspection (PSI). If there is an issue with ACST310-8BTR, 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 ACST310-8BTR part is unused and in its original packaging.
Return procedure for ACST310-8BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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