STMicroelectronics Z0103DN 5AA4

Overview

Z0103DN 5AA4 from STMicroelectronics is a 1 A, 800 V sensitive-gate triac in SOT-223 package, designed for AC phase-control switching in low-power consumer electronics. It features 3 mA maximum gate trigger current (IGT), 1.6 V max on-state voltage at 25 °C, and 20 A/µs critical rate of rise of on-state current (dl/dt), enabling direct microcontroller drive in electrovalve, pump, and small lamp control circuits.

For engineers reviewing the Z0103DN 5AA4 datasheet, Z0103DN 5AA4 pinout, Z0103DN 5AA4 application, or Z0103DN 5AA4 equivalent, key selection criteria include gate sensitivity (3 mA), blocking voltage (800 V), thermal resistance (25 °C/W junction-to-tab), RMS current derating vs. tab temperature, and SOT-223 footprint compatibility with PCB layout constraints.

Technical Context

This triac operates in all four quadrants with symmetrical triggering characteristics, supporting bidirectional AC conduction without external polarity management. Its 3 mA IGT(Q1) rating allows reliable turn-on from 3.3 V GPIOs with minimal series resistance, while dV/dt immunity ≥100 V/µs (Z0110 variant) and 50 V/µs (Z0109) ensures noise-immune operation in noisy appliance environments.

Thermal design relies on the SOT-223's 25 °C/W junction-to-tab thermal resistance under 90 °C tab temperature limit, enabling 1 A RMS conduction with ≤15 W dissipation. The device's 0.95 V threshold on-state voltage at 125 °C and 400 mΩ dynamic resistance minimize conduction losses in thermally constrained home appliance PCBs.

Key Specifications

Pinout & Package

SOT-223 package with exposed thermal tab (pin 4), standardized for surface-mount assembly and thermal transfer to PCB copper. Pin 1 = A2 (main terminal 2), Pin 2 = A1 (main terminal 1), Pin 3 = G (gate), Pin 4 = tab (internally connected to A2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Z0103DN 5AA4, Z0103MN 5AA4 trades 200 V blocking margin for identical sensitivity and package, while BT134-600D sacrifices SMT compatibility and thermal efficiency for broader distributor availability in through-hole formats.

Availability

Z0103DN 5AA4 is available at Aetrix Electronics and suitable for home appliance control, AC motor regulation, and electrovalve actuation requiring stable component supply across high-volume production cycles.

Supply support for Z0103DN 5AA4 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 microcontrollers for industrial and consumer markets.

The Z01 series belongs to ST's standard triac product line, engineered specifically for cost-sensitive, space-constrained AC switching in white goods and small appliances where gate sensitivity and SMT thermal performance are critical.

FAQ

What is the maximum allowable tab temperature for continuous 1 A RMS operation?

The SOT-223 package specifies a maximum tab temperature (T_tab) of 90 °C for full 1 A RMS rating. Exceeding this requires derating per Figure 2 in DS2116 - e.g., at 75 °C tab, RMS current drops to ~0.85 A. Thermal design must ensure ≥5 cm² copper area under the tab to achieve the rated 25 °C/W junction-to-tab resistance.

Can Z0103DN 5AA4 be driven directly from a 3.3 V microcontroller GPIO?

Yes - with IGT(Q1) ≤3 mA and VGT ≤1.3 V, a 3.3 V GPIO driving through a 1 kΩ series resistor delivers ~2.3 mA gate current, exceeding the guaranteed minimum trigger level. No external transistor buffer is needed, simplifying BOM and layout in space-constrained appliance PCBs.

How does the 800 V VDRM rating impact surge protection in 230 VAC systems?

The 800 V VDRM provides 3.5× margin above 230 VAC peak voltage (325 V), accommodating common-mode surges per IEC 61000-4-5 Level 3 (2 kV line-to-ground). This eliminates need for upstream MOVs in many Class II appliance designs, reducing bill-of-materials and board area.

Is the thermal tab electrically isolated from the die in Z0103DN 5AA4?

No - the SOT-223 thermal tab is internally bonded to A2 (main terminal 2). PCB layout must treat the tab as a live AC node; isolation is achieved only via creepage/clearance spacing to adjacent traces, not internal insulation. This configuration maximizes thermal transfer but mandates proper high-voltage routing practices.