onsemi SZMMBZH15VAWT1G

Overview

SZMMBZH15VAWT1G from onsemi is a dual common-anode Zener diode array designed for transient overvoltage and ESD protection of two signal lines in space-constrained, high-reliability systems. It delivers 40 W peak pulse power (1 ms), 15 V nominal Zener breakdown voltage (14.25–15.75 V), and clamps to ≤21 V at 1.0 A peak pulse current - used in USB data lines, industrial sensor interfaces, and automotive infotainment I/O protection.

For engineers reviewing the SZMMBZH15VAWT1G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional/unidirectional configuration flexibility, 175 °C maximum junction temperature, Class 3B (>16 kV HBM) ESD rating, and SC-70 package compatibility with automated SMT assembly.

Technical Context

This dual Zener device integrates two monolithic silicon junctions sharing a common anode (Pin 3), enabling either independent unidirectional clamping (Pins 1–3 and Pins 2–3) or combined bidirectional operation (Pins 1–2). Its thermal design supports continuous operation up to TJ = 175 °C, with RθJA = 605 °C/W on FR-5 board.

It meets stringent ESD immunity requirements: >16 kV per Human Body Model (HBM) and >400 V per Machine Model (MM), while maintaining low leakage (<50 nA @ VRWM = 12 V) and UL 94 V-0 flammability compliance - critical for medical and automotive electronics.

Key Specifications

Pinout & Package

SC-70 (Case 419, Style 4) surface-mount package with molded thermosetting plastic body, Pb-free finish, and UL 94 V-0 rating. Designed for reflow soldering at 260 °C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Zener ESD protection applications.

Compared with MMBZH15VAWT1G and SZMMBZH12VAWT1G, the SZMMBZH15VAWT1G uniquely combines AEC-Q101 readiness, 15 V nominal clamping, and dual-line protection in SC-70 - making it the only drop-in solution for automotive 15 V I/O protection requiring zero layout change and guaranteed high-temp reliability.

Availability

SZMMBZH15VAWT1G is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive infotainment I/O hardening, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SZMMBZH15VAWT1G 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZMMBZHxxVAWT1G series belongs to onsemi's high-reliability transient voltage suppression portfolio, engineered specifically for dual-line ESD protection in mission-critical automotive and industrial systems where space, temperature, and certification constraints dominate design decisions.

FAQ

What is the maximum clamping voltage of the SZMMBZH15VAWT1G during a 1.0 A ESD event?

The SZMMBZH15VAWT1G clamps to a maximum of 21 V at 1.0 A peak pulse current (IPP), as specified in the Electrical Characteristics table. This value ensures protected circuits remain safely below typical 24 V absolute maximum ratings of interface ICs. The clamping behavior is validated per Figure 5 waveform and remains stable across −55 °C to +125 °C ambient conditions. SZMMBZH15VAWT1G achieves this with minimal voltage overshoot due to its low dynamic impedance.

Does the SZMMBZH15VAWT1G support bidirectional ESD protection?

Yes, the SZMMBZH15VAWT1G supports bidirectional operation by connecting Pins 1 and 2 to the differential pair and Pin 3 to ground - forming a symmetrical Zener clamp. In this configuration, it suppresses ±15 V transients equally, with identical clamping performance in both polarities. The datasheet confirms bidirectional mode in Figure 1 and Table 1 notes, and the SC-70 Style 4 pinout (dual cathodes, common anode) inherently enables this topology. SZMMBZH15VAWT1G does not require external components to achieve bidirectional behavior.

Is the SZMMBZH15VAWT1G qualified for automotive applications?

Yes, the "SZ" prefix explicitly denotes automotive-grade qualification per AEC-Q101 stress testing requirements. The SZMMBZH15VAWT1G undergoes high-temperature reverse bias, temperature cycling, and ESD validation beyond commercial-grade parts. Its 175 °C maximum junction temperature and robust package construction meet Tier-1 automotive subsystem reliability standards. SZMMBZH15VAWT1G is approved for use in infotainment, ADAS sensor interfaces, and body control modules where long-term field reliability is mandatory.

What is the leakage current specification for SZMMBZH15VAWT1G at 12 V reverse bias?

The SZMMBZH15VAWT1G exhibits a maximum reverse leakage current of 50 nA at VRWM = 12 V and TA = 25 °C, as stated in the Electrical Characteristics table. This ultra-low leakage preserves signal fidelity in high-impedance sensor nodes and battery-powered devices. Leakage remains below 100 nA up to +85 °C (per Figure 2), ensuring stable performance in warm environments. SZMMBZH15VAWT1G's leakage is significantly lower than standard TVS diodes, reducing quiescent power loss in always-on circuits.

Can the SZMMBZH15VAWT1G replace two single Zener diodes in a design?

Yes, the SZMMBZH15VAWT1G replaces two discrete 15 V Zeners with identical electrical specs while occupying a single SC-70 footprint - reducing PCB area by ~60% and eliminating one solder joint. Its dual-junction monolithic structure ensures matched VBR tracking (<0.3 V mismatch) and synchronized thermal response, unlike discrete pairs. SZMMBZH15VAWT1G also simplifies BOM management and improves yield by removing placement variability. No layout redesign is needed when migrating from two SOD-323 Zeners to SZMMBZH15VAWT1G.