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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics Z0409NF0AA2

Name: Z0409NF0AA2
Brand: STMicroelectronics
SKU: Z0409NF0AA2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: Z0409NF0AA2

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-202 No Tab

Datasheet:: Z0409NF0AA2.pdf

Description:: TRIAC SENS GATE 800V 4A TO202-3

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Product details

Overview

Z0409NF0AA2 from STMicroelectronics is a 4 A, 800 V RMS triac in TO-202-3 package, optimized for microcontroller-driven AC switching with 10 mA gate trigger current (IGT) in Quadrants I, II, III, and IV. It supports home appliance control including electrovalves, pumps, door locks, and lamp dimming, and features 20 A non-repetitive surge current and 2.2 A²s I²t rating.

For engineers reviewing the Z0409NF0AA2 datasheet, Z0409NF0AA2 pinout, Z0409NF0AA2 application, or Z0409NF0AA2 equivalent, key selection criteria include gate sensitivity (10 mA), blocking voltage (800 V), thermal resistance (15 °C/W junction-to-lead), dV/dt immunity (100 V/µs min), and compatibility with zero-crossing or phase-angle control topologies in 50/60 Hz mains systems.

Technical Context

This triac operates in all four quadrants with symmetrical triggering behavior, enabling bidirectional AC conduction without external polarity management. Its 10 mA IGT allows direct drive from GPIO pins of 3.3 V or 5 V microcontrollers without buffer stages.

Thermal design relies on R_th(j-l) = 15 °C/W and R_th(j-a) = 100 °C/W, requiring heatsinking for sustained 4 A RMS loads above 25 °C ambient. The device maintains latching current (I_L) ≤ 15 mA and holding current (I_H) ≤ 10 mA across -40 to +125 °C junction temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	4 A - Sustained AC load current capability at 25 °C ambient with proper heatsinking
VDRM / VRRM	800 V - Peak repetitive off-state voltage withstand in both directions, suitable for 230 VAC mains with safety margin
IGT (Q1–Q4)	10 mA max - Gate current required to trigger conduction; enables direct MCU GPIO drive
dV/dt (min)	100 V/µs - Immunity to false turn-on from rapid voltage transients on main terminals
I²t (fusing)	2.2 A²s - Energy threshold before thermal failure during short-duration surges (e.g., inrush)
Rth(j-l)	15 °C/W - Junction-to-lead thermal resistance; defines minimum heatsink requirement for continuous operation
VTM (max)	2.0 V - On-state voltage drop at 5.5 A, determining conduction loss (≤11 W at full load)

Pinout & Package

Package: TO-202-3 (ECOPACK® lead-free, 0.8 g, tube packaging). Standard 3-terminal through-hole package with isolated tab (A2 connected to case).

Pin/Terminal	Circuit Role	Design Meaning
A1	Main Terminal 1	Anode 1 - Primary current path terminal; referenced as common return in most AC switch configurations
A2	Main Terminal 2	Anode 2 - Case-connected terminal; electrically tied to metal tab; must be isolated from PCB ground unless designed as heatsink reference
G	Gate	Control input - Accepts low-energy trigger pulse to initiate conduction between A1 and A2 in any quadrant

Key Features

Feature	Design Value
Quadrant I–IV operation	Enables universal AC phase control without polarity-sensitive external circuitry
10 mA gate sensitivity	Eliminates need for discrete gate driver transistors when interfacing with standard MCUs
800 V blocking voltage	Supports global 230 VAC and 120 VAC applications with ≥2× safety margin against line surges
ECOPACK® packaging	Lead-free second-level interconnect compliant with JEDEC JESD97; RoHS and REACH ready
20 A non-repetitive surge	Withstands motor startup currents and lamp filament inrush without latch-up or degradation

Applications

Home Appliance Motor Control

Small Lamp Dimming

Use Scenario: Controlling speed of AC induction motors in washing machine drain pumps or HVAC blowers.

IC Role / Device Role / Timing Role: Bidirectional AC power switch triggered by MCU-generated phase-angle pulses.

Use Value: Enables precise torque/speed regulation using low-cost microcontrollers without opto-isolated drivers.

Use Scenario: Smooth brightness control of incandescent or halogen lamps in smart lighting modules.

IC Role / Device Role / Timing Role: Phase-controlled AC switch synchronized to zero-crossing detection for EMI reduction.

Use Value: Delivers flicker-free dimming with <10 mA gate drive, eliminating external amplification stages.

Electrovalve Actuation

Door Lock Driver

Use Scenario: On/off switching of solenoid-based water/gas valves in dishwashers and coffee machines.

IC Role / Device Role / Timing Role: Latching AC switch activated by brief gate pulse; holds conduction until current zero-crossing.

Use Value: Provides fail-safe deactivation at AC zero-crossing, minimizing contact arcing and EMI generation.

Use Scenario: Powering electromagnetic door locks in access control systems powered from 230 VAC mains.

IC Role / Device Role / Timing Role: High-voltage AC switch controlled via isolated MCU output to energize/de-energize lock coil.

Use Value: Supports 800 V standoff for robust operation under brownout and lightning-induced transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Z0409MF0AA2	600 V VDRM instead of 800 V; identical 10 mA IGT and TO-202-3 package	Suitable only for 120 VAC or well-filtered 230 VAC systems with lower transient risk	Select when cost optimization outweighs surge margin requirements
BT139-800R	800 V VDRM, 16 A IT(RMS), 35 mA IGT, TO-220AB package; higher current rating but requires gate buffer	Better suited for high-power fan controllers or industrial heaters where >4 A load is expected	Choose when scaling beyond 4 A RMS while retaining same voltage class and reliability profile

Compared with Z0409MF0AA2, this part offers superior transient immunity for 230 VAC deployments; versus BT139-800R, it reduces system BOM count by eliminating gate drive transistors but limits maximum load current to 4 A.

Availability

Z0409NF0AA2 is available at Aetrix Electronics and suitable for home appliance motor control, small lamp dimming, electrovalve actuation, and door lock driver applications requiring stable component supply and long-term industrial availability.

Supply support for Z0409NF0AA2 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The Z04 series belongs to ST's general-purpose power switching product line, engineered specifically for cost-sensitive, microcontroller-integrated AC load control in white goods and building automation.

FAQ

What is the maximum junction temperature for continuous operation?

The Z0409NF0AA2 has an operating junction temperature range of -40 to +125 °C. Continuous operation at rated 4 A RMS requires thermal design ensuring T_j does not exceed +125 °C, typically achieved using the 15 °C/W junction-to-lead resistance with appropriate heatsinking and ambient derating per Figure 2.

Can this triac be driven directly from a 3.3 V microcontroller GPIO?

Yes - with a 10 mA maximum gate trigger current (IGT) and 1.3 V maximum gate trigger voltage (VGT), the Z0409NF0AA2 can be driven directly from a 3.3 V MCU GPIO using a series resistor (e.g., 220 Ω) to limit peak gate current to <1.2 A, satisfying both IGM and PG(AV) limits under typical pulse conditions.

Is heatsinking required for 4 A RMS operation at 50 °C ambient?

Yes - at 50 °C ambient, Figure 2 shows derated RMS current of ~3.2 A for R_th(j-a) = 100 °C/W. To sustain 4 A RMS, a heatsink reducing effective R_th(j-a) to ≤60 °C/W is required, achievable using the metal tab (A2) as thermal interface with insulated mounting hardware.

Does this device support snubberless operation?

No - while the Z0409NF0AA2 offers 100 V/µs dV/dt immunity, snubberless operation is not guaranteed per datasheet. Applications with inductive loads (e.g., motors, solenoids) require external RC snubbers to suppress voltage overshoot during commutation and prevent false triggering.

Z0409NF0AA2 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-202 No Tab

Packaging:: Tube

Product Status:: Obsolete

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 800 V

Current - On State (It (RMS)) (Max):: 4 A

Voltage - Gate Trigger (Vgt) (Max):: 1.3 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 20A, 21A

Current - Gate Trigger (Igt) (Max):: 10 mA

Current - Hold (Ih) (Max):: 10 mA

Configuration:: Single

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-202-3

Z0409NF0AA2 FAQ

1.How can I place an order for Z0409NF0AA2 through Aetrix?

Please submit a Request for Quotation (RFQ) for Z0409NF0AA2 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 Z0409NF0AA2 reliable?

The price and inventory of Z0409NF0AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for Z0409NF0AA2 is usually 5 days.

3.What payment methods are accepted for Z0409NF0AA2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for Z0409NF0AA2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for Z0409NF0AA2?

Z0409NF0AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your Z0409NF0AA2 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 Z0409NF0AA2?

For technical support, including Z0409NF0AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your Z0409NF0AA2 requirements.

6.How does Aetrix verify that Z0409NF0AA2 is sourced from the original manufacturer or authorized distributors?

All Z0409NF0AA2 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 Z0409NF0AA2 meets industry standards.

7.What is the process for return or replacement of Z0409NF0AA2?

All Z0409NF0AA2 units undergo pre-shipment inspection (PSI). If there is an issue with Z0409NF0AA2, 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 Z0409NF0AA2 part is unused and in its original packaging.

Return procedure for Z0409NF0AA2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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