STMicroelectronics Z0405NF0AA2

Overview

Z0405NF0AA2 from STMicroelectronics is a 4 A, 800 V RMS sensitive-gate triac in TO-202-3 package, designed for AC mains switching in microcontroller-driven home appliance loads including electrovalves, pumps, door locks, and small lamp control. It features 5 mA gate trigger current (Q1), 2.0 V max on-state voltage at 5.5 A, and 20 A non-repetitive surge rating.

For engineers reviewing the Z0405NF0AA2 datasheet, Z0405NF0AA2 pinout, Z0405NF0AA2 application, or Z0405NF0AA2 equivalent, key selection criteria include gate sensitivity (5 mA), blocking voltage (800 V), thermal resistance (15 °C/W junction-to-lead), and compatibility with zero-crossing or phase-control AC dimming circuits.

Technical Context

This triac operates in all four quadrants with verified Q1 triggering capability and supports both leading-edge and zero-crossing firing modes. Its 100 V/µs critical dV/dt rating (at Tj = 110 °C) and 20 A/µs dI/dt capability enable robust commutation in inductive AC loads.

Designed for direct drive from 3.3 V or 5 V MCU GPIOs without external amplification, it maintains guaranteed IGT ≤ 5 mA across -40 to +125 °C junction temperature range and exhibits 0.95 V threshold voltage at 125 °C.

Key Specifications

Pinout & Package

TO-202-3 package: insulated plastic case with three leads-A1 (MT1), A2 (MT2), and G (gate)-mounted vertically with A1 and A2 on outer positions and gate centered. Lead spacing matches standard PCB footprints for manual or automated insertion.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT136-800E and Z0405MF0AA2, Z0405NF0AA2 uniquely balances 4 A capacity, 800 V robustness, 5 mA gate sensitivity, and TO-202-3 compactness-making it optimal for space-constrained, microcontroller-driven 230 VAC appliance controls requiring reliable low-power triggering.

Availability

Z0405NF0AA2 is available at Aetrix Electronics and suitable for home appliance motor control, fan speed regulation, small lamp dimming, and electrovalve actuation requiring stable component supply across industrial production lifecycles.

Supply support for Z0405NF0AA2 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 reliability under thermal cycling and EMI resilience are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The Z0405NF0AA2 has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 4 A RMS requires maintaining Tj ≤ 125 °C, achievable with 15 °C/W junction-to-lead thermal resistance and adequate PCB copper area or minimal heatsinking per Figure 2 in the datasheet.

Can this triac be used with 3.3 V microcontrollers without external components?

Yes-its guaranteed IGT ≤ 5 mA at 25 °C and 1.3 V max VGT allows direct drive from 3.3 V GPIO pins. A series 220 Ω resistor limits peak gate current to <15 mA during triggering, satisfying PG(AV) = 0.2 W and IGM = 1.2 A limits without additional circuitry.

Is a snubber circuit required for inductive loads?

A snubber is recommended for highly inductive loads (e.g., large motors) to suppress dV/dt-induced false triggering. For typical appliance pumps or fans, the device's 2 V/µs (dV/dt)c rating and built-in dI/dt immunity often allow snubberless operation when gate drive timing avoids commutation during high dv/dt periods.

How does the ECOPACK® designation affect assembly processes?

ECOPACK® indicates lead-free second-level interconnect compliant with JEDEC JESD97. Standard Pb-free reflow profiles apply (peak 260 °C, 10 s max). The inner box label specifies soldering conditions; no special flux or process deviation is needed beyond standard RoHS-compliant assembly practices.