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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics Z0409MH

Name: Z0409MH
Brand: STMicroelectronics
SKU: Z0409MH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: Z0409MH

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: Z0409MH.pdf

Description:: TRIAC 600V 4A IPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

Z0409MH from STMicroelectronics is a 4 A, 600 V repetitive peak off-state voltage (VDRM/VRRM) four-quadrant triac in IPAK through-hole package, with 10 mA gate trigger current (IGT), 125 °C max junction temperature, and halogen-free/lead-free ECOPACK2 compliance. It switches resistive and inductive loads in AC mains control circuits for heating elements and motor-driven power tools.

For engineers reviewing the Z0409MH datasheet, Z0409MH pinout, Z0409MH application, or Z0409MH equivalent, key selection criteria include RMS on-state current rating (4 A), non-repetitive surge capability (15 A @ 20 ms), dV/dt immunity (100 V/µs min), thermal resistance (3 °C/W j-c), and gate drive compatibility with standard microcontroller GPIOs.

Technical Context

This four-quadrant triac operates across all gate polarity–main terminal voltage combinations without requiring external commutation circuitry. Its 10 mA IGT enables direct drive from low-power logic outputs, while 100 V/µs dV/dt immunity ensures reliable turn-off in noisy industrial environments with inductive kickback.

The device features a low on-state voltage (2 V max at 5.5 A, 25 °C) and dynamic resistance of 180 mΩ at 125 °C, minimizing conduction losses in thermally constrained applications. Junction-to-case thermal resistance of 3 °C/W supports high-power density mounting on heatsinks.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	4 A - Sustains continuous AC load current up to 4 A at case temperature ≤107 °C
VDRM / VRRM	600 V - Blocks 600 V repetitive AC peak voltage across main terminals A1–A2
VDSM / VRSM	750 V - Withstands 750 V non-repetitive transient overvoltage for 10 ms
IGT	10 mA max - Gate trigger current threshold compatible with 3.3 V/5 V MCU GPIOs
dV/dt	100 V/µs min - Immune to false triggering from fast-rising line transients
Rth(j-c)	3 °C/W max - Enables efficient heat transfer to external heatsink for stable 4 A operation
TL	260 °C - Lead temperature tolerance supports standard 10 s wave soldering process

Pinout & Package

IPAK package: compact through-hole outline with three leads (A1, A2, G), 0.31 g mass, UL94 V0 halogen-free molding compound, lead-free plating, and 16.1 mm overall height.

Pin/Terminal	Circuit Role	Design Meaning
A1	Main Terminal 1 (Anode 1)	Reference terminal for gate drive; connected to neutral or low-side return path in AC phase-control circuits
A2	Main Terminal 2 (Anode 2)	High-side load connection; carries full RMS load current and withstands 750 V non-repetitive surges
G	Gate	Four-quadrant trigger input; accepts ±10 mA pulses to initiate conduction regardless of A2–A1 polarity

Key Features

Feature	Design Value
Four-quadrant operation	Enables gate triggering with either polarity of A2 relative to A1 - eliminates need for external diodes or polarity-sensitive drive circuitry
ECOPACK2 compliance	Meets RoHS, halogen-free, and lead-free requirements without compromising thermal or electrical performance
125 °C max junction temperature	Supports reliable operation in enclosed industrial enclosures with ambient temperatures up to 85 °C and heatsink-limited derating
15 A non-repetitive surge rating	Withstands motor startup inrush or transformer magnetizing surges lasting 20 ms without failure

Applications

Heating Control in Ovens

Power Tool Motor Speed Control

Use Scenario: Phase-angle controlled AC power delivery to resistive heating elements in domestic ovens and cooktops.

IC Role / Device Role / Timing Role: Main AC switching element triggered by zero-crossing synchronized PWM to regulate average power.

Use Value: 4 A RMS rating and 600 V blocking support 900 W–1.2 kW heating loads at 230 VAC; low VTM reduces self-heating during extended bake cycles.

Use Scenario: Variable-speed control of universal motors in corded drills and sanders via leading-edge phase control.

IC Role / Device Role / Timing Role: Bidirectional AC switch activated by microcontroller-generated gate pulses synchronized to line zero crossings.

Use Value: 100 V/µs dV/dt immunity prevents false triggering from motor back-EMF spikes; 15 A surge rating handles stall-current transients.

Inrush Current Limiting

Industrial Solenoid Actuation

Use Scenario: Soft-start circuit limiting inrush into large capacitive or transformer-coupled loads during system power-up.

IC Role / Device Role / Timing Role: Controlled turn-on device delaying full conduction until after initial surge decay, reducing stress on upstream fuses and rectifiers.

Use Value: Precise 10 mA IGT allows predictable timing of turn-on delay using RC-trigger networks; 750 V VRSM blocks transformer flyback spikes.

Use Scenario: On/off switching of 24–230 VAC solenoids in factory automation valves and pneumatic controls.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays, driven directly by PLC output modules.

Use Value: Four-quadrant operation eliminates need for external snubbers or polarity reversal circuitry; IPAK package enables PCB-mount reliability superior to relay-based solutions.

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, TO-92 package, 25 mA IGT	Higher gate drive requirement; limited thermal dissipation due to plastic TO-92	Select when board space is extremely constrained and load current remains ≤3 A with forced-air cooling
TIC206D	4 A IT(RMS), 600 V VDRM, TO-220 package, 5 mA IGT	Lower IGT eases microcontroller drive but requires larger TO-220 footprint and mounting hardware	Select when higher gate sensitivity is critical and heatsinking infrastructure already exists for TO-220 form factor

Compared with BT134-600D and TIC206D, Z0409MH delivers optimal balance of low gate drive (10 mA), compact IPAK thermal performance (3 °C/W j-c), and four-quadrant flexibility-making it preferred for space-constrained, thermally demanding AC control in home appliances and portable power tools.

Availability

Z0409MH is available at Aetrix Electronics and suitable for heating control, motor speed regulation, inrush limiting, and solenoid actuation requiring stable component supply across production lifecycles.

Supply support for Z0409MH 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

Z0409MH belongs to ST's high-reliability AC power switching portfolio, engineered specifically for robust, low-maintenance solid-state replacement of mechanical relays in mains-powered equipment.

FAQ

What is the maximum allowable case temperature for continuous 4 A operation?

The datasheet specifies IT(RMS) = 4 A at Tc = 107 °C. Exceeding this case temperature requires linear derating per Figure 2; sustained operation above 107 °C risks exceeding the 125 °C junction limit even with adequate heatsinking.

Can Z0409MH be used with zero-crossing SSR driver ICs like MOC3021?

Yes - Z0409MH's 10 mA IGT is fully compatible with standard optotriac drivers such as MOC3021 (rated for ≥15 mA output). No series gate resistor is needed when driving from MOC3021's internal LED+phototriac output stage.

Does Z0409MH require a snubber circuit in inductive load applications?

A snubber is recommended for highly inductive loads (e.g., contactor coils) to suppress dv/dt-induced retriggering. The device's 100 V/µs dV/dt rating provides margin, but RC snubbers improve reliability when switching transformers or solenoids with >100 mH inductance.

Is the IPAK package suitable for automated through-hole assembly?

Yes - the IPAK package has standardized lead spacing and geometry compliant with IPC-7351B, supporting wave soldering at 260 °C for 10 s and compatible with standard pick-and-place and solder-paste stencil processes for high-volume manufacturing.

Z0409MH Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ECOPACK2

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Active

Triac Type:: Standard

Voltage - Off State:: 600 V

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

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 15A, 16A

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:: IPAK

Z0409MH FAQ

1.How can I place an order for Z0409MH through Aetrix?

Please submit a Request for Quotation (RFQ) for Z0409MH 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 Z0409MH reliable?

The price and inventory of Z0409MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for Z0409MH is usually 5 days.

3.What payment methods are accepted for Z0409MH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for Z0409MH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for Z0409MH?

Z0409MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your Z0409MH 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 Z0409MH?

For technical support, including Z0409MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your Z0409MH requirements.

6.How does Aetrix verify that Z0409MH is sourced from the original manufacturer or authorized distributors?

All Z0409MH 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 Z0409MH meets industry standards.

7.What is the process for return or replacement of Z0409MH?

All Z0409MH units undergo pre-shipment inspection (PSI). If there is an issue with Z0409MH, 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 Z0409MH part is unused and in its original packaging.

Return procedure for Z0409MH:

1.Submit a request within 90 days.

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

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