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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics Z0402DF 1AA2

Name: Z0402DF 1AA2
Brand: STMicroelectronics
SKU: Z0402DF 1AA2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: Z0402DF 1AA2

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-202 No Tab

Datasheet:: Z0402DF 1AA2.pdf

Description:: TRIAC SENS GATE 400V 4A TO202-3

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Inventory:8,449

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Product details

Overview

Z0402DF 1AA2 from STMicroelectronics is a 4 A, 600 V RMS sensitive-gate triac in TO-202-3 package, rated for 3 mA gate trigger current (IGT) in Quadrant I/II/III/IV, with 20 A non-repetitive surge rating and 2.2 A²s I²t fusing value - used for microcontroller-driven AC load switching in home appliance electrovalves and small lamp control.

For engineers reviewing the Z0402DF 1AA2 datasheet, Z0402DF 1AA2 pinout, Z0402DF 1AA2 application, or Z0402DF 1AA2 equivalent, key selection criteria include gate sensitivity (3 mA), blocking voltage (600 V), thermal resistance (15 °C/W junction-to-lead), dV/dt immunity (10 V/µs min), and TO-202-3 mechanical compatibility with PCB-mount AC switching modules.

Technical Context

This triac operates in all four quadrants with symmetrical triggering behavior, enabling phase-angle and zero-crossing AC control without external polarity management. Its low 3 mA IGT allows direct drive from 3.3 V or 5 V GPIO pins with minimal series resistance.

Thermal design relies on R_th(j-l) = 15 °C/W (junction-to-lead) and R_th(j-a) = 100 °C/W, supporting 4 A RMS conduction at T_amb ≤ 75 °C with adequate heatsinking. The 20 A/µs dI/dt rating ensures robust turn-on under inductive load transients.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	4 A - supports continuous AC loads up to 960 W at 240 VAC
VDRM / VRRM	600 V - blocks line transients up to 600 V peak in 230 VAC mains systems
IGT (Q1–Q4)	3 mA max - compatible with standard MCU GPIO without buffer stage
dV/dt (min)	10 V/µs - prevents false triggering from EMI or fast line edges
Rth(j-l)	15 °C/W - enables efficient heat transfer to PCB copper or clip-on heatsink
I²t (fusing)	2.2 A²s - defines single-pulse short-circuit withstand capability
VTM (max)	2.0 V - limits on-state power loss to ≤8 W at 4 A RMS

Pinout & Package

TO-202-3 package with isolated tab (A2), leads arranged linearly: Pin 1 = A1 (MT1), Pin 2 = G (Gate), Pin 3 = A2 (MT2). Tab is electrically connected to A2 and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	AC load return path; referenced to neutral or low-side of AC bridge
G	Gate	Low-current trigger input; requires ≥3 mA pulse for reliable turn-on in all quadrants
A2 (MT2)	Main Terminal 2	AC line input or high-side connection; tab-mounted for thermal conduction

Key Features

Feature	Design Value
Quadrant I–IV operation	Enables universal AC phase control without polarity-sensitive driver circuitry
ECOPACK® lead-free packaging	Complies with RoHS and JEDEC JESD97 marking for environmental compliance
20 A non-repetitive surge rating	Withstands motor startup inrush or transformer magnetizing current surges
100 °C/W junction-to-ambient R_th	Permits board-level thermal management without mandatory heatsink in low-duty-cycle apps

Applications

Home Appliance Electrovalve Control

Fan Speed Controller

Use Scenario: On/off sequencing of 230 VAC solenoid valves in washing machines and dishwashers.

IC Role / Device Role / Timing Role: Main AC power switch triggered by MCU PWM output through RC snubber network.

Use Value: 3 mA IGT enables direct GPIO drive; 600 V VDRM accommodates 230 VAC + 50% safety margin.

Use Scenario: Phase-cut dimming of universal motor fans in HVAC and kitchen appliances.

IC Role / Device Role / Timing Role: Bidirectional AC switch synchronized to zero-crossing detection for smooth speed regulation.

Use Value: Quadrant IV triggering supports leading-edge dimming; 20 A/µs dI/dt handles motor inductive kickback.

Small Lamp Dimmer Module

Door Lock Actuator Driver

Use Scenario: Mains-powered LED or incandescent lamp dimming in smart home wall switches.

IC Role / Device Role / Timing Role: AC line switch modulated via trailing-edge or leading-edge phase control.

Use Value: 10 V/µs dV/dt rating suppresses false triggering from TRIAC commutation noise.

Use Scenario: 230 VAC solenoid lock activation in access control panels and smart door systems.

IC Role / Device Role / Timing Role: High-reliability latching switch with fail-safe off-state isolation.

Use Value: 0.5 mA IRRM at 125 °C ensures >10⁶ cycle insulation integrity in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BT134-600D	4 A IT(RMS), 600 V VDRM, 5 mA IGT, TO-220AB package	Higher IGT requires gate buffer; larger footprint and higher R_th(j-a) (125 °C/W)	Prefer when existing layout uses TO-220 and gate drive has ≥5 mA capability
MAC4DCM	4 A IT(RMS), 600 V VDRM, 10 mA IGT, TO-220 package	10 mA IGT mandates active gate driver; no ECOPACK® marking	Select only if legacy supply chain mandates ON Semiconductor sourcing

Compared with BT134-600D and MAC4DCM, Z0402DF 1AA2 offers lowest gate drive demand (3 mA), smallest thermal resistance (15 °C/W j-l), and RoHS-compliant ECOPACK® construction - making it optimal for space-constrained, MCU-direct, and thermally managed AC switching designs.

Availability

Z0402DF 1AA2 is available at Aetrix Electronics and suitable for home appliance electrovalve control, fan speed controllers, and small lamp dimmer modules requiring stable component supply across industrial production cycles.

Supply support for Z0402DF 1AA2 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.

Z04 series triacs belong to ST's power discrete portfolio, engineered specifically for cost-sensitive, high-volume AC switching in white goods and building automation where gate sensitivity, thermal efficiency, and RoHS compliance are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The Z0402DF 1AA2 has a specified operating junction temperature range of –40 °C to +125 °C. Continuous conduction at 4 A RMS requires maintaining T_j ≤ 125 °C via appropriate heatsinking or ambient derating - e.g., limiting ambient to 75 °C when using R_th(j-a) = 100 °C/W.

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

Yes - with IGT ≤ 3 mA and VGT ≤ 1.3 V, the Z0402DF 1AA2 can be triggered directly from a 3.3 V MCU GPIO using a 1 kΩ series resistor (delivering ~3.3 mA at V_GS ≈ 0 V). No level-shifting or buffer transistor is required for basic on/off control.

Does it require a snubber circuit for inductive loads?

A snubber (RC network across MT1–MT2) is recommended for inductive loads like motors or solenoids to limit dV/dt during commutation. The device's 10 V/µs dV/dt rating is exceeded by typical inductive turn-off transients, so snubbers prevent unintended re-triggering.

Is the TO-202-3 package lead-free and RoHS compliant?

Yes - the Z0402DF 1AA2 is supplied in ST's ECOPACK® package, featuring lead-free second-level interconnect and full compliance with RoHS Directive 2011/65/EU. JEDEC JESD97 marking is present on both device body and inner box label.

Z0402DF 1AA2 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-202 No Tab

Packaging:: Bulk

Product Status:: Active

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 400 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):: 3 mA

Current - Hold (Ih) (Max):: 3 mA

Configuration:: Single

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-202-3

Z0402DF 1AA2 FAQ

1.How can I place an order for Z0402DF 1AA2 through Aetrix?

Please submit a Request for Quotation (RFQ) for Z0402DF 1AA2 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 Z0402DF 1AA2 reliable?

The price and inventory of Z0402DF 1AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for Z0402DF 1AA2 is usually 5 days.

3.What payment methods are accepted for Z0402DF 1AA2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for Z0402DF 1AA2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for Z0402DF 1AA2?

Z0402DF 1AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your Z0402DF 1AA2 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 Z0402DF 1AA2?

For technical support, including Z0402DF 1AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your Z0402DF 1AA2 requirements.

6.How does Aetrix verify that Z0402DF 1AA2 is sourced from the original manufacturer or authorized distributors?

All Z0402DF 1AA2 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 Z0402DF 1AA2 meets industry standards.

7.What is the process for return or replacement of Z0402DF 1AA2?

All Z0402DF 1AA2 units undergo pre-shipment inspection (PSI). If there is an issue with Z0402DF 1AA2, 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 Z0402DF 1AA2 part is unused and in its original packaging.

Return procedure for Z0402DF 1AA2:

1.Submit a request within 90 days.

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

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