Z0409MH STMicroelectronics Triac MT (Transistor Outline, Vertical) In Stock
The Z0409MH is a 4 A, logic-level 4-quadrant triac from STMicroelectronics housed in an IPAK (vertical TO-251) package. It offers gate triggering from low-level logic signals in all 4 quadrants, simplifying direct microcontroller-driven AC load switching for lighting, motor, and heating control applications.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- Z0409MH Datasheet PDF
- Category
- Triac MT
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4 A RMS on-state current rating for AC load switching
- 4-quadrant logic-level gate triggering compatible with 3.3 V and 5 V microcontrollers
- IPAK (TO-251) vertical package for compact through-hole or surface mounting
- Suitable for directly driving resistive and inductive AC loads up to line voltage
- Low gate trigger current enabling direct MCU interface without optocoupler gate drive amplifiers
Applications
The Z0409MH is commonly used in home appliance control boards, HVAC systems, and smart lighting dimmers where a microcontroller or logic-level signal must switch an AC mains load directly. Its 4-quadrant triggering capability and low gate current threshold make it ideal for solid-state relay modules, heater controllers, and fan speed regulators in consumer and industrial products.
Specifications
| Factory Lead Time | 15Weeks |
| YTEOL | 6 |
| Trigger Device Type | 4 QUADRANT LOGIC LEVEL TRIAC |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for Z0409MH:
Frequently Asked Questions
What continuous on-state current can Z0409MH handle, and is that sufficient for a 500 W resistive heating element on a 120 V AC line?
Z0409MH is rated at 4 A RMS continuous on-state current. A 500 W load on a 120 V line draws approximately 4.2 A RMS, which slightly exceeds the rating. For a 500 W heater, designers should derate to 80% capacity or select a higher-current variant such as a 6 A triac to maintain thermal margin and device longevity.
Can Z0409MH be triggered directly from a 3.3 V microcontroller GPIO without an external gate driver or optocoupler?
Yes, Z0409MH is a logic-level 4-quadrant triac with low gate trigger current, designed to fire from 3.3 V or 5 V logic signals. However, for safety isolation when switching AC mains voltages, most designs still incorporate an optocoupler such as a MOC3021 series device between the microcontroller and the triac gate, even though the gate threshold itself is logic-compatible.
What does 4-quadrant triggering mean for Z0409MH and how does it simplify phase control dimmer designs?
4-quadrant triggering means the Z0409MH can be fired in all combinations of positive and negative gate current with positive and negative anode voltage. This flexibility eliminates the need to synchronize gate pulse polarity with line voltage phase, simplifying phase-cutting dimmer and soft-start circuits and reducing the MCU firmware complexity needed to track AC zero crossings.
How long is the typical factory lead time for Z0409MH and what should buyers plan for production scheduling?
The Z0409MH carries a typical factory lead time of 15 weeks, which is longer than commodity triacs. Procurement teams planning production runs should place orders at least one full quarter ahead and consider safety stock to buffer against demand spikes, particularly given the 6-year YTEOL rating that indicates continued production availability in the IPAK package.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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