STMicroelectronics Z0402MF 1AA2

Overview

Z0402MF 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 capability and 100 °C/W junction-to-ambient thermal resistance - used for direct microcontroller-driven AC load switching in electrovalves and small lamp controls.

For engineers reviewing the Z0402MF 1AA2 datasheet, Z0402MF 1AA2 pinout, Z0402MF 1AA2 application, or Z0402MF 1AA2 equivalent, key selection criteria include gate sensitivity (3 mA), blocking voltage (600 V), RMS current rating (4 A), thermal resistance (100 °C/W), and TO-202-3 mechanical compatibility for PCB-mount AC switching designs.

Technical Context

This triac operates in all four quadrants with symmetrical triggering behavior, enabling phase-control and zero-crossing switching in bidirectional AC circuits. Its 3 mA maximum IGT allows direct drive from low-power GPIOs without external amplification.

Thermal design relies on R_th(j-a) = 100 °C/W and R_th(j-l) = 15 °C/W, with derating required above 25 °C ambient. The device sustains 20 A surge (50 Hz, 20 ms) and withstands dV/dt up to 10 V/µs at T_j = 110 °C with gate open.

Key Specifications

Pinout & Package

TO-202-3 package with isolated tab (A2 connected to case), standard lead configuration for through-hole mounting and thermal transfer to PCB copper pour or heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT134-600D and MAC4DCM, Z0402MF 1AA2 offers lower gate drive demand (3 mA vs. ≥5 mA), smaller TO-202-3 footprint, and documented ECOPACK® compliance - making it optimal for space-constrained, microcontroller-direct, RoHS-aligned AC switching.

Availability

Z0402MF 1AA2 is available at Aetrix Electronics and suitable for electrovalve control, fan speed regulation, small lamp dimming, and door lock actuation requiring stable component supply across industrial appliance and building automation programs.

Supply support for Z0402MF 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

Z0402MF 1AA2 belongs to the Z04 Standard Triacs product line, engineered specifically for cost-effective, sensitive-gate AC switching in white goods and building controls where direct microcontroller interface and thermal efficiency are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The Z0402MF 1AA2 has an operating junction temperature range of –40 °C to +125 °C. Continuous operation must remain within this limit, with thermal design ensuring junction temperature does not exceed +125 °C under worst-case ambient and load conditions, using R_th(j-a) = 100 °C/W and R_th(j-l) = 15 °C/W as reference.

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

Yes - with a maximum IGT of 3 mA and VGT ≤ 1.3 V, the Z0402MF 1AA2 can be driven directly from a 3.3 V GPIO using a series resistor (e.g., 1 kΩ) to limit gate current to ~2.0 mA while maintaining sufficient margin for temperature drift and process variation across the full operating range.

Is the A2 terminal electrically connected to the metal tab?

Yes - in the TO-202-3 package, the A2 terminal is internally bonded to the metal tab. This provides both electrical connection and thermal conduction path; designers must ensure proper isolation or grounding of the tab per system safety requirements (e.g., Class I appliance insulation).

Does this part support zero-crossing switching?

No - the Z0402MF 1AA2 is a standard sensitive-gate triac without integrated zero-crossing detection. It conducts immediately upon gate trigger and remains latched until current falls below holding current (IH ≤ 3 mA). Zero-crossing functionality requires external circuitry or a dedicated zero-crossing optotriac driver.