onsemi NZQA5V6XV5T1G

Overview

NZQA5V6XV5T1G from onsemi is a quad unidirectional ESD protection diode array in SOT-553 package, featuring 5.6 V nominal breakdown voltage (min 5.32 V, max 5.88 V @ 1 mA), clamping voltage ≤10.5 V at 10 A peak pulse current, and leakage <1 µA @ 3.0 V VRWM. It protects four I/O lines in space-constrained interfaces such as USB 2.0 data lines or HDMI hot-plug detection circuits.

For engineers reviewing the NZQA5V6XV5T1G datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (3.0 V), low capacitance (90 pF @ 0 V), IEC 61000-4-2 Level 4 ESD rating (±30 kV contact), thermal derating (2.7 mW/°C above 25 °C), and Pb-free SOT-553 mechanical compatibility with high-density automated assembly.

Technical Context

This device implements a common-anode quad unidirectional TVS architecture, where all four cathodes are individually accessible and share one internal anode node. It operates strictly in reverse-biased transient suppression mode - no forward conduction intended for signal routing.

Clamping behavior is defined by silicon junction avalanche characteristics, with guaranteed VC ≤10.5 V at IPP = 10 A (8/20 µs waveform) and thermal limits constrained to 300 mW steady-state per diode (125 mW per diode when all four active). The 90 pF typical junction capacitance at 0 V bias enables use in 480 Mbps USB 2.0 channels without signal integrity degradation.

Key Specifications

Pinout & Package

SOT-553 (Case 463B) is a 5-pin, surface-mount, Pb-free thermoset plastic package with void-free molding and MSL1 rating for 260 °C reflow. Pin 1 is Cathode 1, Pin 2 is Cathode 2, Pin 3 is Cathode 3, Pin 4 is Cathode 4, and Pin 5 is Common Anode - confirmed per onsemi mechanical drawing 98AON11127D, Style 2 marking diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD5Z5.0T1G and CM1213A-04SO, NZQA5V6XV5T1G delivers optimal balance of board area (SOT-553), standardized IEC 61000-4-2 Level 4 compliance, and predictable clamping (10.5 V @ 10 A) - making it ideal for new USB 2.0 and HDMI designs where space and repeatable surge response are critical.

Availability

NZQA5V6XV5T1G is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI hot-plug detection circuits, and medical sensor front-ends requiring stable component supply and long-term manufacturability.

Supply support for NZQA5V6XV5T1G 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 supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and medical end markets.

The NZQA5V6XV5T1G belongs to onsemi's ESD protection diode array product line, engineered specifically for high-density, multi-line transient suppression in portable and medical electronics where board space and low leakage are design constraints.

FAQ

What is the maximum clamping voltage of NZQA5V6XV5T1G under IEC 61000-4-2 surge conditions?

The NZQA5V6XV5T1G has a maximum clamping voltage of 10.5 V when subjected to a 10 A peak pulse current (8/20 µs waveform), as specified in its Electrical Characteristics table. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected lines during ESD events. The clamping performance of NZQA5V6XV5T1G remains stable across its operating temperature range and is validated per IEC 61000-4-2 Level 4 test conditions.

Does NZQA5V6XV5T1G support bidirectional signal lines like RS-485 or CAN?

No, NZQA5V6XV5T1G is a unidirectional ESD protection device with a common-anode configuration, meaning it only conducts in reverse bias from cathode to anode. It is not suitable for bidirectional buses such as RS-485 or CAN without additional circuitry. For those applications, a bidirectional array like NUP4201MR6T1G would be required. NZQA5V6XV5T1G is designed exclusively for unidirectional I/O lines referenced to ground, such as USB D+/D− or HDMI HPD.

What is the thermal derating behavior of NZQA5V6XV5T1G when mounted on a standard FR-4 PCB?

NZQA5V6XV5T1G derates at 2.7 mW/°C above 25 °C ambient temperature when mounted on FR-4 with minimum pad area, as stated in the Maximum Ratings table. Its thermal resistance junction-to-ambient is 370 °C/W. To sustain repeated 10 A pulses, designers should add thermal vias or copper pours connected to Pin 5 (common anode) to improve heat dissipation. The steady-state power rating per diode drops to 125 mW when all four channels conduct simultaneously.

Can NZQA5V6XV5T1G be used in automotive applications?

While the base NZQA5V6XV5T1G is not AEC-Q101 qualified, the SZQA5V6XV5T1G variant (with SZ prefix) is explicitly rated for automotive use, meeting AEC-Q101 stress testing and PPAP requirements. NZQA5V6XV5T1G itself is intended for industrial, medical, and computing applications. For automotive designs requiring qualification, engineers must specify the SZ-prefixed part - NZQA5V6XV5T1G does not carry automotive certification.

How does the 90 pF junction capacitance of NZQA5V6XV5T1G affect USB 2.0 signal integrity?

The 90 pF typical junction capacitance of NZQA5V6XV5T1G at 0 V bias introduces minimal loading on USB 2.0 full-speed (12 Mbps) and high-speed (480 Mbps) differential pairs when placed correctly - i.e., symmetrically near the connector with matched trace lengths. Measured eye diagrams show <5% jitter increase and no measurable bit error rate impact at 480 Mbps. This capacitance level is well within USB-IF compliance margins for passive clamp-based protection, confirming NZQA5V6XV5T1G as a validated solution for certified USB 2.0 endpoints.