STMicroelectronics Z0109MA 2AL2

Overview

Z0109MA 2AL2 from STMicroelectronics is a 1 A, 600 V RMS-rated sensitive-gate triac in TO-92 straight-lead package, designed for AC phase-control switching in microcontroller-driven home appliance loads. It features 10 mA max gate trigger current (IGT), 1.6 V max on-state voltage (VT), and 400 mΩ dynamic resistance, enabling direct GPIO drive in electrovalve, pump, and small lamp control circuits.

For engineers reviewing the Z0109MA 2AL2 datasheet, Z0109MA 2AL2 pinout, Z0109MA 2AL2 application, or Z0109MA 2AL2 equivalent, key selection criteria include gate sensitivity (10 mA IGT), thermal resistance (Rth(j-l) = 60 °C/W), dV/dt immunity (50 V/µs min), and TO-92 lead-form compatibility with through-hole PCB assembly and ammopack logistics.

Technical Context

This triac operates in all four quadrants with symmetrical triggering characteristics, supporting bidirectional AC conduction without external polarity management. Its 10 mA IGT rating (Q1–Q4) and 1.3 V max VGT allow reliable turn-on from 3.3 V or 5 V MCU outputs without buffer stages.

Thermal design relies on junction-to-lead conduction (Rth(j-l) = 60 °C/W), limiting continuous RMS current to 1 A at TL = 50 °C per Table 1. Critical dI/dt capability (≥2 A/µs) and dV/dt immunity (≥50 V/µs at Tj = 110 °C) ensure noise-immune commutation in inductive fan and pump loads.

Key Specifications

Pinout & Package

TO-92 straight-lead package with 3-pin configuration: A1 (MT1), A2 (MT2), G (Gate). Leads are unbent per matchbox packing (2AL2), compatible with standard through-hole reflow or wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Z0107MA and Z0110MA, Z0109MA offers optimal balance: sufficient gate sensitivity (10 mA) for modern low-voltage MCUs while maintaining higher dV/dt immunity (50 V/µs vs. 20 V/µs for Z0107MA) and lower latching current (15 mA vs. 25 mA for Z0110MA), improving reliability in marginal conduction conditions.

Availability

Z0109MA 2AL2 is available at Aetrix Electronics and suitable for home appliance control, fan speed regulation, and electrovalve actuation requiring stable component supply across production lifecycles.

Supply support for Z0109MA 2AL2 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

Z01 series triacs are part of ST's general-purpose AC switching portfolio, engineered specifically for cost-sensitive, space-constrained home appliance applications requiring robust, low-drive, through-hole AC control devices.

FAQ

What is the maximum ambient temperature for continuous 1 A RMS operation in TO-92 package?

At free-air convection (no heatsink), Z0109MA 2AL2 supports 1 A RMS up to 50 °C ambient temperature, as defined by its Rth(j-a) = 150 °C/W and Tj(max) = 125 °C. Above 50 °C, derating is required per Figure 3 in DS2116.

Can Z0109MA 2AL2 replace a mechanical relay in a 230 VAC, 500 mA resistive load?

Yes - with 600 V VDRM and 1 A IT(RMS), it safely switches 230 VAC/500 mA loads. Its 8 A non-repetitive surge rating (ITSM) handles cold-filament inrush, and TO-92 mounting simplifies PCB integration versus relay footprints.

Is gate resistor required when driving Z0109MA 2AL2 directly from an STM32 GPIO?

A 100 Ω series gate resistor is recommended to limit peak IGT to ≤10 mA and suppress ringing. The GPIO must source ≥10 mA at 3.3 V; verify with actual MCU datasheet - some low-drive pins may require buffering.

Does Z0109MA 2AL2 support snubberless operation in inductive fan loads?

No - while its 2 A/µs dI/dt rating and 50 V/µs dV/dt provide improved noise immunity, ST recommends a RC snubber (e.g., 100 Ω + 100 nF) across MT1–MT2 for reliable commutation in inductive motor loads per Application Note AN437.