onsemi NZQA5V6AXV5T1

Overview

NZQA5V6AXV5T1 from onsemi is a quad unidirectional ESD protection diode array in SOT-553 package, featuring 3.0 V stand-off voltage, 5.6 V nominal breakdown voltage (at 1 mA), clamping voltage ≤13 V at 16 A peak pulse current, and IEC 61000-4-2 Level 4 (±8 kV contact) ESD compliance. It protects four independent signal lines in space-constrained interfaces such as USB 1.1/2.0 full-speed ports.

For engineers reviewing the NZQA5V6AXV5T1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under IEC 61000-4-2 waveform, low leakage (<1.0 µA at VRWM), 7.0 pF typical capacitance at 0 V bias, and compatibility with FR-4 PCB layouts requiring minimal board area.

Technical Context

This device implements four independent silicon avalanche diodes configured as cathode-to-line, common-anode architecture - enabling bidirectional transient suppression per line while maintaining unidirectional conduction path relative to the shared anode. Each channel operates with 3.0 V working peak reverse voltage and exhibits <1.0 µA reverse leakage at rated VRWM.

The clamping behavior is characterized using the standardized 8/20 µs surge waveform and IEC 61000-4-2 ESD pulse; it delivers ≤13 V clamping at 16 A IPP, with thermal derating governed by R_JA = 327 °C/W on FR-4 board. Its 7.0 pF capacitance at 0 V supports high-speed data lines up to USB Full Speed (12 Mbps) without signal integrity degradation.

Key Specifications

Pinout & Package

SOT-553 package: 5-lead plastic surface-mount package with gull-wing leads, dimensions 1.60 mm × 1.20 mm × 0.60 mm (L × W × H), thermal resistance R_JA = 327 °C/W on FR-4 board with minimum pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD5V3U4-2/TR and TPD4E05U06DQAR, NZQA5V6AXV5T1 offers optimal balance of low clamping, moderate capacitance, and true quad-channel integration in the smallest footprint - making it preferred for cost-sensitive, space-constrained USB and parallel port designs.

Availability

NZQA5V6AXV5T1 is available at Aetrix Electronics and suitable for USB interface protection, parallel port hardening, and notebook internal I/O safeguarding requiring stable component supply across production lifecycles.

Supply support for NZQA5V6AXV5T1 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NZQA5V6AXV5T1 belongs to onsemi's ESD protection diode family designed specifically for compact, high-reliability transient suppression in high-volume data interface applications - emphasizing low clamping, predictable failure mode, and manufacturability.

FAQ

What is the maximum peak pulse current rating for NZQA5V6AXV5T1?

The NZQA5V6AXV5T1 is rated for 16 A maximum reverse peak pulse current (I_PP) under the 8/20 µs surge waveform per IEC 61000-4-5. This value corresponds to the test condition used to specify its 13 V clamping voltage and reflects single-event survivability - not repetitive surge capability. Derating applies above 25°C ambient per the published power derating curve.

Does NZQA5V6AXV5T1 support bidirectional ESD protection?

No, NZQA5V6AXV5T1 implements a quad unidirectional configuration: each of the four cathodes connects to a protected line, while the common anode ties to ground. It clamps positive transients on signal lines relative to ground but does not protect against negative excursions beyond the forward voltage drop (~0.8 V). For true bidirectional protection, a dual-rail array like NZQ6V8AXV5 would be required.

Can NZQA5V6AXV5T1 be used on 5 V logic lines?

NZQA5V6AXV5T1 has a 3.0 V working peak reverse voltage (V_RWM) and 5.6 V nominal breakdown voltage, making it unsuitable for direct use on 5 V logic rails - sustained 5 V bias would cause excessive leakage and potential thermal runaway. It is engineered for 3.3 V systems such as USB Full Speed, where V_RWM provides adequate margin above nominal signaling levels.

What is the thermal resistance of NZQA5V6AXV5T1 on a standard PCB?

The NZQA5V6AXV5T1 has a junction-to-ambient thermal resistance (R_JA) of 327 °C/W when mounted on a standard FR-4 board with minimum copper pad area. This value assumes no additional thermal vias or copper pour; adding thermal relief or stitching vias can reduce R_JA by up to 30%, improving surge energy handling during repeated ESD events.

Is NZQA5V6AXV5T1 compliant with RoHS and REACH regulations?

Yes, NZQA5V6AXV5T1 is a Pb-free device manufactured in accordance with RoHS Directive 2011/65/EU and fully compliant with REACH Regulation (EC) No. 1907/2006. The SOT-553 package uses matte tin lead finish, and material declarations confirm absence of SVHC substances above threshold limits - documentation is available via onsemi's product compliance portal.