STMicroelectronics Z0402MB

Overview

Z0402MB from STMicroelectronics is a 4 A, 600 V repetitive peak off-state voltage (VDRM/VRRM) four-quadrant triac in DPAK package, designed for AC load switching in home appliances and power tools. It features 3 mA gate trigger current (IGT), 125 °C maximum junction temperature, and 750 V non-repetitive peak voltage (VDSM/VRSM), enabling robust control of resistive and inductive heating elements.

For engineers reviewing the Z0402MB datasheet, Z0402MB pinout, Z0402MB application, or Z0402MB equivalent, key selection criteria include quadrants compatibility, dV/dt immunity (≥20 V/µs at 110 °C), thermal resistance (Rth(j-c) = 3 °C/W), and ECOPACK2-compliant halogen-free packaging for industrial-grade reliability.

Technical Context

This four-quadrant triac operates across all gate polarity–main terminal polarity combinations without external circuitry, supporting universal triggering in phase-control and zero-crossing applications. Its 3 mA IGT and 1.3 V VGT ensure low-power gate drive compatibility with microcontrollers and optocouplers.

With 50 A/µs critical rate of rise of on-state current (dl/dt) and ≥0.5 V/µs (dV/dt)c at 110 °C, it withstands fast transients in motor-driven and inrush-limited circuits. The DPAK package delivers 3 °C/W junction-to-case thermal resistance, enabling 4 A RMS conduction at Tc = 107 °C without forced cooling.

Key Specifications

Pinout & Package

The Z0402MB is housed in a surface-mount DPAK (TO-252) package with three terminals: Gate (G), Main Terminal 1 (A1), and Main Terminal 2 (A2). The exposed tab (A2) serves as both electrical connection and thermal path.

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, Z0402MB uniquely combines DPAK SMT compatibility, 3 mA low-IGT drive, and 125 °C junction rating-making it optimal for space-constrained, thermally demanding, and microcontroller-driven AC control systems.

Availability

Z0402MB is available at Aetrix Electronics and suitable for heating control in consumer appliances, motor control in power tools, and inrush limiting in industrial power supplies requiring stable component supply and long-term manufacturing continuity.

Supply support for Z0402MB 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

Z0402MB belongs to ST's high-reliability AC switch portfolio, engineered specifically for robust, low-IGT, four-quadrant triac operation in cost-sensitive, thermally constrained SMT applications.

FAQ

What is the maximum allowable case temperature for continuous 4 A RMS operation?

The datasheet specifies IT(RMS) = 4 A at Tc = 107 °C. Exceeding this case temperature reduces safe current handling due to thermal derating; operation above 107 °C requires reduction in load current per Figure 2 in DS14024. Thermal design must maintain case temperature ≤107 °C using adequate PCB copper area or heatsinking.

Can Z0402MB be used with zero-crossing trigger circuits?

Yes-Z0402MB supports zero-crossing operation because its four-quadrant architecture allows triggering at any point in the AC cycle, including near zero voltage. However, gate timing must align with actual zero-crossing detection; the device itself does not generate zero-crossing signals.

Is the DPAK tab (A2) electrically isolated from other pins?

No-the DPAK tab is internally connected to Main Terminal 2 (A2) and is not insulated. When mounted on a PCB, the tab must be routed to the same net as A2 and cannot serve as a floating thermal pad. Electrical isolation requires external insulation such as a mica washer or thermal pad with dielectric layer.

Does Z0402MB require a snubber circuit in inductive load applications?

A snubber is recommended for inductive loads (e.g., solenoids, motors) to suppress voltage spikes exceeding 750 V VRSM. The device's 20 V/µs dV/dt immunity helps but does not eliminate risk of false turn-on; RC snubbers across A1–A2 improve reliability in such cases per ST Application Note AN437.