STMicroelectronics Z0103NA 5AL2

Overview

Z0103NA from STMicroelectronics is a 1 A, 800 V RMS-rated sensitive-gate triac in TO-92 package, designed for AC phase-control switching in low-power mains-connected loads. It features 3 mA maximum gate trigger current (Q1), 1.6 V max on-state voltage at 1.4 A, and 100 V/µs dV/dt immunity at 110 °C - enabling direct microcontroller drive in electrovalve, pump, and small lamp control circuits.

For engineers reviewing the Z0103NA datasheet, Z0103NA pinout, Z0103NA application, or Z0103NA equivalent, this part supports reliable zero-crossing–compatible AC switching with verified thermal performance up to 125 °C junction temperature, validated gate sensitivity across quadrants, and TO-92 lead-form compatibility for through-hole PCB assembly.

Technical Context

This triac operates in all four quadrants with gate-triggered conduction controlled by A1–A2 voltage polarity and gate current polarity. Its 3 mA IGT(Q1) enables direct drive from 3.3 V/5 V GPIO without external amplification, while dV/dt immunity ≥100 V/µs (at Tj = 110 °C) ensures robust noise immunity in noisy appliance environments.

Thermal design is constrained by Rth(j-l) = 60 °C/W (TO-92), limiting continuous RMS current to 1 A at TL = 50 °C. The device sustains non-repetitive surge currents up to 8 A (50 Hz, 20 ms), supporting motor startup and inrush transient handling in fan speed controllers and door lock actuators.

Key Specifications

Pinout & Package

Package: TO-92 (straight leads), plastic, lead-free, halogen-free, UL94 V0 compliant. Tab is not electrically connected; case is isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Z0103MA, Z0103NA provides 200 V higher blocking voltage for enhanced surge resilience in 230 VAC mains; compared with Z0107NA, it reduces required gate drive by 40 %, easing integration with low-current microcontrollers.

Availability

Z0103NA is available at Aetrix Electronics and suitable for electrovalve control, fan speed regulation, and small lamp dimming requiring stable component supply, consistent TO-92 lead-form geometry, and verified 800 V transient blocking capability.

Supply support for Z0103NA 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.

Z01 series triacs are part of ST's general-purpose power switching portfolio, engineered specifically for cost-sensitive, low-to-medium power AC load control in white goods and building automation systems.

FAQ

What is the maximum junction temperature for Z0103NA?

The absolute maximum operating junction temperature is +125 °C, with storage range extending to +150 °C. Derating curves in Figure 2 confirm 1 A IT(RMS) is sustainable only up to TL = 50 °C in TO-92 due to Rth(j-l) = 60 °C/W. Exceeding this requires heatsinking or reduced load duty cycle.

Can Z0103NA be driven directly from a 3.3 V microcontroller GPIO?

Yes - its 3 mA maximum IGT(Q1) at 12 V test condition translates to functional triggering at 3.3 V with typical gate resistor values ≤1 kΩ. Verified operation is documented in Figure 6, showing IGT remains ≤2.5 mA at Tj = 85 °C under 3.3 V drive conditions.

What is the difference between Z0103NA and Z0103NN?

Z0103NA uses TO-92 packaging with straight leads and 5AL2 tape-and-reel delivery; Z0103NN uses SOT-223 packaging with tab thermal path and 5AA4 tape-and-reel. SOT-223 offers lower Rth(j-t) = 25 °C/W versus TO-92's Rth(j-l) = 60 °C/W, enabling higher ambient temperature operation at 1 A load.

Does Z0103NA support bidirectional AC switching without external components?

Yes - as a four-quadrant triac, it conducts in all combinations of A2/A1 polarity and gate current direction. No external diodes or polarity-reversal circuitry is needed; gate drive polarity relative to A1 determines active quadrant, enabling full-wave phase control with single-component simplicity.