STMicroelectronics Z0405MH

Overview

Z0405MH from STMicroelectronics is a 4 A, 600 V repetitive peak off-state voltage (VDRM/VRRM), 4-quadrant triac in IPAK through-hole package, with 5 mA gate trigger current (IGT) and 125 °C maximum junction temperature, designed for AC load switching in heating elements and motor-driven power tools.

For engineers reviewing the Z0405MH datasheet, Z0405MH pinout, Z0405MH application, or Z0405MH equivalent, key selection criteria include RMS on-state current rating (4 A), non-repetitive surge capability (15 A @ 20 ms), critical dV/dt immunity (≥20 V/µs at 110 °C), thermal resistance (3 °C/W junction-to-case), and halogen-free ECOPACK2 compliance.

Technical Context

The Z0405MH operates as a bidirectional AC switch enabling full-wave conduction across all four quadrants without external polarity biasing. Its 5 mA IGT ensures reliable triggering with low-power gate drivers, while 750 V non-repetitive peak voltage (VDSM/VRSM) supports transient overvoltage tolerance during inrush events.

Thermal design is enabled by a low Rth(j-c) of 3 °C/W and Tj max of 125 °C, allowing sustained 4 A RMS operation at case temperatures up to 107 °C. The device maintains static dV/dt immunity ≥20 V/µs and critical rate of rise of on-state current (dl/dt) ≥50 A/µs under specified gate drive conditions.

Key Specifications

Pinout & Package

IPAK package: compact through-hole outline with three terminals (A1, A2, G), halogen-free molding compound, lead-free plating, UL94 V0 rated, 0.3 g unit weight, and standardized mechanical dimensions per DS14063 Rev 1 page 6–7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT134-600E, Z0405MH offers superior thermal performance (3 vs. 5.5 °C/W) and higher junction temperature margin (125 vs. 110 °C); compared with Z0405NF, it lowers gate drive burden (5 vs. 10 mA) without sacrificing voltage or thermal capability.

Availability

Z0405MH is available at Aetrix Electronics and suitable for heating element control, power tool motor drives, inrush current limiting circuits, and industrial actuator switching requiring stable component supply and long-term industrial lifecycle support.

Supply support for Z0405MH 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The Z0405MH belongs to ST's high-reliability AC switch portfolio, engineered specifically for robust, low-IGT, 4-quadrant triac operation in cost-sensitive, thermally demanding home appliance and power tool applications.

FAQ

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

The Z0405MH supports continuous 4 A RMS conduction at case temperature (Tc) up to 107 °C, as specified in Table 1 of DS14063. Exceeding this temperature requires derating per Figure 2, which shows average current decreasing linearly beyond 107 °C due to thermal saturation limits.

Can Z0405MH replace a BT136-600D in an existing design?

Z0405MH is not a direct replacement for BT136-600D: the latter is a 4 A triac in TO-220 package with 15 mA IGT and 110 °C Tj max, whereas Z0405MH uses IPAK packaging, has 5 mA IGT, and 125 °C Tj rating. Mechanical and thermal interface differences require layout and heatsink revalidation.

Does Z0405MH require a snubber circuit for inductive loads?

Snubber use depends on load characteristics: for highly inductive loads (e.g., contactor coils), a RC snubber is recommended to suppress dV/dt-induced false triggering, as Z0405MH's dV/dt immunity (≥20 V/µs) may be exceeded during rapid current interruption. Resistive loads like heaters typically do not require snubbers.

Is Z0405MH compliant with lead-free soldering standards?

Yes - Z0405MH features lead-free plating and is qualified for lead-free reflow soldering with peak temperature up to 260 °C for 10 seconds (TL specification), meeting JEDEC J-STD-020 and RoHS Directive 2011/65/EU requirements as stated in DS14063 Section 2.1.