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STMicroelectronics ACST1635-8FP
- Part No.:
- ACST1635-8FP
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
ACST1635-8FP.pdf
- Description:
- TRIAC 800V 16A TO220FPAB
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
ACST1635-8FP from STMicroelectronics is a 16 A, 800 V RMS overvoltage-protected AC power switch in TO-220FPAB package, built with A.S.D.® (Advanced Surge Dissipation) technology and integrated crowbar clamping. It replaces discrete triac + snubber + MOV solutions in medium-power AC motor and resistive load control, delivering 2 kV IEC 61000-4-5 surge immunity without external protection. Used in washing machine drum motors and refrigerator compressors.
For engineers reviewing the ACST1635-8FP datasheet, ACST1635-8FP pinout, ACST1635-8FP application, or ACST1635-8FP equivalent, key selection criteria include its self-protected VCL ≥850 V clamping threshold, dV/dt immunity ≥1000 V/μs at 125 °C, 150 °C junction rating, and gate trigger current ≤35 mA - all critical for reliable static switching in noisy appliance environments.
Technical Context
The ACST1635-8FP integrates a triac structure with an on-die high-voltage crowbar device that activates when line voltage exceeds VCL (≥850 V), forcing safe conduction to dissipate surge energy through the load. Its turn-off commutation robustness eliminates need for external snubbers with inductive loads up to 16 A.
It operates across full quadrants (I/II/III) with gate-triggered latching, supports 100 A/μs dI/dt without false turn-on, and maintains blocking capability after transient recovery at next zero-crossing - enabling single-device AC line protection and switching in compact home appliance PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 16 A RMS - drives universal motors and compressors without heatsink derating at Tc = 84 °C |
| VDRM / VRRM | 800 V repetitive peak off-state voltage - blocks full AC mains cycle including 230 VAC + 10% tolerance |
| VCL | ≥850 V clamping voltage - initiates crowbar action before destructive overvoltage reaches sensitive downstream circuitry |
| dV/dt immunity | ≥1000 V/μs at 125 °C - prevents false triggering from EFT bursts or motor commutation noise |
| Tj max | 150 °C - enables operation in sealed enclosures with ambient up to 125 °C (per Fig. 3) |
| Rth(j-c) | 3.2 °C/W - allows direct mounting to chassis for thermal management without additional heatsink |
| IGT max | 35 mA - compatible with standard MCU GPIO or optocoupler drivers without gate amplification |
Pinout & Package
TO-220FPAB package: insulated plastic case with metal tab (COM terminal), 3-pin vertical leaded outline, UL94 V0 epoxy, 2.0 g weight, 0.4–0.6 N·m mounting torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Main output terminal (anode of integrated triac) | Connects to AC load; carries full switched current; referenced to COM for voltage measurement |
| COM | Common terminal (cathode of integrated triac + internal crowbar ground reference) | Mounts to heatsink/chassis; provides thermal path and safety isolation barrier (2000 V rms insulation) |
| GATE | Control input (trigger electrode) | Accepts low-energy pulse (≤1 A peak, ≤10 W) to initiate conduction; requires no sustained drive |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | Eliminates external MOVs/snubbers while meeting IEC 61000-4-5 Level 4 (2 kV line-earth) |
| No-snubber inductive switching | Drives 16 A universal motors or compressors without RC snubber, reducing BOM count and board space |
| High dV/dt immunity | 1000 V/μs at 125 °C ensures stable operation during EFT bursts and motor brush noise |
| UL-certified 2000 V rms insulation | Enables reinforced isolation in Class I appliances without additional creepage/clearance design effort |
| ECOPACK®2 compliance | Meets RoHS, halogen-free, and REACH requirements for global appliance market access |
Applications
| Coffee Making Appliances | Washing Machine Drum Motor |
|---|---|
Use Scenario: Precise ON/OFF control of heating elements and pump motors during brew cycles and descaling routines. IC Role / Device Role / Timing Role: AC power switch replacing mechanical relay; handles 12–16 A resistive loads with zero-crossing-compatible gating. Use Value: Eliminates contact wear and audible click; withstands repeated 2 kV surges from shared kitchen circuits. | Use Scenario: Bidirectional speed and direction control of universal drum motors using phase-shifted gate pulses. IC Role / Device Role / Timing Role: Quadrant-I/II/III triac-based AC switch; sustains 100 A/μs dI/dt during motor startup without false turn-on. Use Value: No external snubber needed despite high inductance; thermal margin supports 150 °C junction during spin-cycle overload. |
| Refrigerator Compressor | Solid State Relay Module |
Use Scenario: Inrush-current-tolerant switching of hermetic compressors during defrost and cooling cycles. IC Role / Device Role / Timing Role: Overvoltage-protected AC switch; absorbs turn-off inductive kick via internal crowbar. Use Value: Withstands 140 A non-repetitive surge (IEC 61000-4-5) without degradation; recovers blocking after each zero-crossing. | Use Scenario: Core switching element in DIN-rail mounted SSRs for HVAC and industrial panel control. IC Role / Device Role / Timing Role: Isolated AC output stage; interfaces with optocoupled input via GATE pin. Use Value: 2000 V rms certified insulation enables direct mains connection without auxiliary isolation transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-6SN | 8 A rating, 600 V VDRM, no integrated crowbar; requires external MOV | Limited to lower-power resistive loads; unsuitable for compressor inrush or IEC 61000-4-5 compliance | Select only for cost-sensitive, low-surge environments where external protection is acceptable |
| BTB16-800CW | Standard triac, 16 A/800 V, no VCL or crowbar; dV/dt = 500 V/μs max | Requires full snubber network and external surge protection to match ACST1635-8FP's ruggedness | Choose only if legacy design reuse is required and board area for protection components is available |
Compared with ACS108-6SN and BTB16-800CW, the ACST1635-8FP delivers system-level simplification by integrating surge protection, eliminating snubbers, and guaranteeing 2 kV line immunity - reducing total solution size by ≥30% and qualification testing scope.
Availability
ACST1635-8FP is available at Aetrix Electronics and suitable for coffee makers, washing machine motor drives, and refrigerator compressor controls requiring stable component supply across multi-year appliance production lifecycles.
Supply support for ACST1635-8FP 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 AC power switch product line - including ACST1635-8FP - targets high-reliability AC load control in white goods and industrial equipment, emphasizing integrated surge resilience, thermal robustness, and regulatory compliance.
FAQ
What is the maximum continuous load current the ACST1635-8FP can switch without a heatsink?
At case temperature Tc = 84 °C, the ACST1635-8FP supports 16 A RMS continuous current per datasheet Table 1. Without forced cooling, practical free-air operation is limited to ~3 A (Fig. 3), but direct mounting to a ≥100 cm² metal chassis enables full 16 A rating due to its 3.2 °C/W Rth(j-c).
Does the ACST1635-8FP require a snubber circuit when driving inductive loads?
No. The device's integrated crowbar and optimized triac structure eliminate the need for external RC snubbers with inductive loads up to 16 A, as verified in Figure 15 and Section 2.1. This is confirmed by its specified (dI/dt)c ≥36 A/ms at 125 °C and validated surge testing per IEC 61000-4-5.
How does the VCL parameter function during a line surge event?
VCL (≥850 V) defines the voltage threshold at which the internal crowbar activates, forcing the device into low-impedance conduction for <10 ms to safely shunt surge energy through the load. After the event, it automatically recovers blocking capability at the next AC zero-crossing - no reset or external intervention required.
Is the ACST1635-8FP certified for use in UL-listed appliances?
Yes. It carries UL certification (File E81734) with 2000 V rms insulation rating and complies with UL 60730-1 for automatic electrical controls. Its ECOPACK®2 construction meets RoHS and halogen-free requirements for global appliance safety approvals.
ACST1635-8FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ASD
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Standard
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 16 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 140A, 147A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 30 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FPAB
ACST1635-8FP FAQ
1.How can I place an order for ACST1635-8FP through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST1635-8FP 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 ACST1635-8FP reliable?
The price and inventory of ACST1635-8FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST1635-8FP is usually 5 days.
3.What payment methods are accepted for ACST1635-8FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST1635-8FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST1635-8FP?
ACST1635-8FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST1635-8FP 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 ACST1635-8FP?
For technical support, including ACST1635-8FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST1635-8FP requirements.
6.How does Aetrix verify that ACST1635-8FP is sourced from the original manufacturer or authorized distributors?
All ACST1635-8FP 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 ACST1635-8FP meets industry standards.
7.What is the process for return or replacement of ACST1635-8FP?
All ACST1635-8FP units undergo pre-shipment inspection (PSI). If there is an issue with ACST1635-8FP, 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 ACST1635-8FP part is unused and in its original packaging.
Return procedure for ACST1635-8FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACST1635-8FP Tags
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STMicroelectronics
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Littelfuse Inc.
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Z0103MNT1G
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T835-600B-TR
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2N6073BG
Littelfuse Inc.
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2N6075BG
Littelfuse Inc.
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BTA08-600CWRG
STMicroelectronics
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T835H-6G-TR
STMicroelectronics
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BTA16-800BRG
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MAC4DHMT4G
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