My Inquiry
My Account
STMicroelectronics ACST4-7SFP
- Part No.:
- ACST4-7SFP
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
ACST4-7SFP.pdf
- Description:
- TRIAC 700V 4A TO220FPAC
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ACST4-7SFP from STMicroelectronics is a single-pole, AC power switch in TO-220FPAB package, built on ASD™ technology with integrated high-voltage clamping (VCL = 1100 V), 700 V blocking voltage (VDRM/VRRM), 4 A RMS on-state current (IT(RMS)), and gate trigger current <10 mA. It directly interfaces microcontrollers to drive inductive loads such as dishwasher spray pumps and air-conditioner fans without external snubbers or overvoltage protection.
For engineers reviewing the ACST4-7SFP datasheet, ACST4-7SFP pinout, ACST4-7SFP application, or ACST4-7SFP equivalent, this device offers verified IEC 61000-4-5 transient ruggedness (2 kV line surge), high static dV/dt (>500 V/µs at Tj = 110 °C), and thermal reliability up to 125 °C junction temperature - critical for appliance control systems requiring robust AC line switching.
Technical Context
The ACST4-7SFP integrates a Triac-based switching structure with monolithically embedded avalanche clamping, enabling safe turn-off energy absorption during inductive load commutation. Its planar die construction ensures high off-state reliability and eliminates need for external MOVs or RC snubbers under IEC 61000-4-5 stress conditions.
It operates in all four quadrants (QI–QIV) with gate-triggered turn-on and natural commutation at AC zero-crossing. The low 10 mA IGT and 1.5 V VTM at 5.6 A support direct logic-level drive via series resistor, while its 50 A/µs dI/dt rating sustains fast-rising inrush currents in fan and pump motor circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | ±700 V - Withstands repetitive AC line peaks up to 495 V RMS (e.g., 230 V mains + 20% tolerance) without conduction. |
| IT(RMS) | 4 A at Tc = 100 °C - Sustains continuous resistive or inductive load current typical of 500–900 W appliances. |
| VCL | 1100 V typ. - Clamps transient overvoltages (e.g., IEC 61000-4-5 2 kV surge) to safe levels before breakdown. |
| IGT | <10 mA - Enables direct drive from 3.3 V/5 V MCU GPIO pins using only a current-limiting resistor (e.g., 470 Ω). |
| dV/dt (static) | >500 V/µs at Tj = 110 °C - Prevents false triggering from EMI or line noise in noisy industrial/appliance environments. |
| Rth(j-c) | 4.6 °C/W - Enables thermal design with heatsink or PCB copper area to maintain Tj ≤ 125 °C under full 4 A load. |
| ITSM | 30 A for 20 ms (50 Hz) - Handles motor startup surges without fuse tripping or device failure. |
Pinout & Package
ACST4-7SFP uses TO-220FPAB package: insulated tab, vertical mounting, 3-pin through-hole outline with 2.4 g mass and UL94 V0 epoxy. Thermal pad electrically isolated from internal die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Switch output terminal | Connects to load (e.g., pump/fan); carries full AC line current; referenced to COM for voltage polarity definition. |
| COM | Common reference terminal | Connects to neutral (or low-side return); defines voltage polarity for OUT and enables bidirectional conduction path. |
| G | Gate control input | Sinks trigger current (<10 mA); requires active-low or resistor-limited logic drive; no pull-up needed due to internal structure. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated avalanche clamping | VCL = 1100 V typ. eliminates need for external MOVs or TVS diodes in IEC 61000-4-5 compliant designs. |
| Direct microcontroller interface | IGT <10 mA and VGT <1 V allow GPIO-driven operation without buffer ICs or level shifters. |
| No external snubber required | High (dI/dt)c (2.5 A/ms) and controlled turn-off dynamics enable reliable switching of 4 A inductive loads without RC networks. |
| High noise immunity | Static dV/dt >500 V/µs at elevated temperature prevents spurious turn-on in EMI-heavy appliance environments. |
| Planar junction technology | Ensures stable VDRM and leakage (IDRM <10 µA at 25 °C) across temperature and lifetime, improving field reliability. |
Applications
| Dishwasher Spray Pump Control | Air-Conditioner Fan Drive |
|---|---|
Use Scenario: On/off cycling of 120–240 V AC spray pump motors during wash/drain cycles in residential dishwashers. IC Role / Device Role / Timing Role: AC line switch replacing mechanical relay; provides zero-crossing turn-on and natural commutation turn-off. Use Value: Eliminates relay contact wear and audible click; withstands 30 A surge during pump startup; meets IEC 61000-4-5 surge immunity without added components. |
Use Scenario: Speed-controlled or staged on/off operation of shaded-pole or PSC fan motors in split-system AC units. IC Role / Device Role / Timing Role: Solid-state AC switch interfacing with MCU PWM or phase-control logic for fan staging. Use Value: Supports 4 A RMS continuous current at 100 °C case temperature; clamps 2 kV transients induced by compressor switching; reduces BOM count by removing snubber network. |
| Induction Cooktop Panel Switching | Smart Plug Load Management |
Use Scenario: Isolation and switching of auxiliary 230 V AC circuits (e.g., display backlight, cooling fan) in induction cooktop control boards. IC Role / Device Role / Timing Role: Low-power AC switch for non-heating subsystems; operated synchronously with main inverter timing. Use Value: High dV/dt immunity prevents false triggering from inverter EMI; 125 °C max junction rating supports compact enclosure thermal design. |
Use Scenario: Remote-controlled on/off switching of 120/230 V AC outlets in smart home energy monitors and plug adapters. IC Role / Device Role / Timing Role: Primary AC switching element driven by ESP32 or similar IoT SoC GPIO pins. Use Value: Direct 3.3 V logic compatibility reduces component count; TO-220FPAB insulation allows safe creepage/clearance in compact PCB layouts; certified for repeated 2 kV surge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST4-7SB | DPAK package (Rth(j-c) = 2.6 °C/W), lower thermal mass, surface-mount only. | Preferred for space-constrained PCBs with adequate copper heatsinking; not suitable for high-vibration or through-hole assembly. | Select when board real estate is limited and thermal management via 0.5 cm² copper pour is feasible. |
| ACST4-7CFP | Higher IGT (≤25 mA), same TO-220FPAB package and clamping performance. | Requires stronger gate drive (e.g., dedicated driver or 10 kΩ pull-down + 470 Ω series resistor), less compatible with weak GPIOs. | Choose only if higher noise margin is needed and gate drive capability exceeds 25 mA peak. |
Compared with ACST4-7SB, ACST4-7SFP offers superior mechanical robustness and easier heatsink attachment; compared with ACST4-7CFP, it delivers lower system cost and simpler drive circuitry due to its 10 mA IGT threshold - making it optimal for cost-sensitive, high-volume appliance control designs.
Availability
ACST4-7SFP is available at Aetrix Electronics and suitable for dishwasher control modules, HVAC fan drivers, induction cooktop auxiliary switching, and smart plug load management requiring stable component supply, long lifecycle support, and IEC-compliant transient ruggedness.
Supply support for ACST4-7SFP 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 ACST4 Series belongs to ST's ASD™ AC Power Switch product line, engineered specifically for solid-state replacement of electromechanical relays in home appliance control systems - emphasizing surge resilience, gate simplicity, and thermal robustness without external protection.
FAQ
What is the maximum ambient temperature for ACST4-7SFP in free-air convection?
At natural convection on FR4 PCB with 0.5 cm² copper under tab, ACST4-7SFP supports up to 4.0 A RMS at 25 °C ambient (Fig. 2-2). Derating begins above 25 °C; at 70 °C ambient, max IT(RMS) drops to ~2.2 A. Forced airflow or heatsink use extends usable range significantly.
Can ACST4-7SFP replace a mechanical relay in a 230 V AC, 3 A fan circuit?
Yes - ACST4-7SFP handles 4 A RMS continuously at Tc = 100 °C and withstands 30 A surges for 20 ms, exceeding typical fan inrush. Its integrated clamping and snubber-free operation eliminate relay bounce, contact welding, and EMI from arcing - validated per IEC 61000-4-5.
Is a gate series resistor required, and what value is recommended?
Yes - a series resistor limits peak gate current during triggering. For 5 V MCU drive, 470 Ω yields ~8.5 mA IGT (within <10 mA spec); for 3.3 V, 330 Ω is appropriate. Resistor power rating must exceed 0.1 W peak (PG(AV) = 0.1 W).
Does ACST4-7SFP require heatsinking for 4 A continuous operation?
Yes - at 4 A RMS, power dissipation is ~1.2 W (VTM × IT ≈ 1.5 V × 0.8 A avg). With Rth(j-c) = 4.6 °C/W, junction rise is ~5.5 °C above case. To hold Tj ≤ 125 °C at 100 °C case, minimal heatsink or ≥10 cm² copper area is required per ST's thermal curves.
ACST4-7SFP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Triac Type:
- Standard
- Voltage - Off State:
- 700 V
- Current - On State (It (RMS)) (Max):
- 4 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 33A
- Current - Gate Trigger (Igt) (Max):
- 25 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -30°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FPAC
ACST4-7SFP FAQ
1.How can I place an order for ACST4-7SFP through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST4-7SFP 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 ACST4-7SFP reliable?
The price and inventory of ACST4-7SFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST4-7SFP is usually 5 days.
3.What payment methods are accepted for ACST4-7SFP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST4-7SFP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST4-7SFP?
ACST4-7SFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST4-7SFP 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 ACST4-7SFP?
For technical support, including ACST4-7SFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST4-7SFP requirements.
6.How does Aetrix verify that ACST4-7SFP is sourced from the original manufacturer or authorized distributors?
All ACST4-7SFP 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 ACST4-7SFP meets industry standards.
7.What is the process for return or replacement of ACST4-7SFP?
All ACST4-7SFP units undergo pre-shipment inspection (PSI). If there is an issue with ACST4-7SFP, 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 ACST4-7SFP part is unused and in its original packaging.
Return procedure for ACST4-7SFP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACST4-7SFP Tags
-
Z0103NN5AA4
STMicroelectronics
-
Z0107MNT1G
Littelfuse Inc.
-
Z0103MNT1G
Littelfuse Inc.
;;2.jpg)
-
T405-800B-TR
STMicroelectronics
-
T835-600B-TR
STMicroelectronics
.JPG)
-
2N6073BG
Littelfuse Inc.
-
2N6075BG
Littelfuse Inc.
-
BTA08-600CWRG
STMicroelectronics
-
T835H-6G-TR
STMicroelectronics
-
BTA16-800BRG
STMicroelectronics
-
T1210-800G-TR
STMicroelectronics
-
MAC4DHMT4G
Littelfuse Inc.
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
