onsemi NZQA6V8AXV5T2

Overview

NZQA6V8AXV5T2 from onsemi is a quad unidirectional ESD protection diode in SOT-553 package, featuring 6.8 V breakdown voltage (V_BR = 6.47–7.14 V), 4.3 V working peak reverse voltage (V_RWM), clamping voltage ≤12 V at 13 A IPP, <1 µA leakage at V_RWM, and 6.7 pF typical capacitance at 0 V bias - deployed for USB 1.1/2.0 data line protection in portable electronics.

For engineers reviewing the NZQA6V8AXV5T2 datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 Level 4 ESD robustness (±8 kV contact), low clamping voltage under transient surge, four-channel discrete protection in one compact footprint, and compliance with USB low/full-speed signal integrity requirements.

Technical Context

This device implements four independent unidirectional Zener-based ESD clamps sharing a common anode terminal, enabling simultaneous protection of four signal lines without cross-coupling. Its architecture delivers fast response (<1 ns) to ESD transients per IEC 61000-4-2 while maintaining low dynamic impedance during clamping.

Designed for low-capacitance interface protection, it achieves 6.7 pF (0 V) and 9.5 pF (3 V) per diode - critical for preserving signal integrity on high-speed digital buses. Thermal derating follows R_JA = 327°C/W on FR-4, with maximum junction temperature rated at 150°C.

Key Specifications

Pinout & Package

SOT-553 (Case 463B) - 5-pin surface-mount plastic package measuring 1.60 mm × 1.20 mm × 0.55 mm, optimized for high-density PCB layouts with minimal pad area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD4E001DRYR and ESD5V3U4-2/TR, NZQA6V8AXV5T2 offers optimal balance of 4.3 V V_RWM headroom for 3.3 V rails, 6.7 pF capacitance for USB signal integrity, and proven Level 4 ESD survivability - making it the preferred choice for space-constrained, cost-sensitive consumer electronics designs.

Availability

NZQA6V8AXV5T2 is available at Aetrix Electronics and suitable for USB interface protection, serial port ESD guard, and microprocessor I/O protection requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for NZQA6V8AXV5T2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NZQA6V8AXV5T2 belongs to onsemi's ESD protection diode family engineered specifically for high-density, low-capacitance transient suppression in portable and interface-critical electronics - emphasizing reliability, small-footprint integration, and standards-compliant immunity.

FAQ

What is the maximum working voltage supported by NZQA6V8AXV5T2?

The NZQA6V8AXV5T2 has a working peak reverse voltage (V_RWM) of 4.3 V, meaning it can safely operate on DC or peak AC signal lines up to this voltage without significant leakage. This makes NZQA6V8AXV5T2 well-suited for 3.3 V digital interfaces such as USB, UART, and SPI, where headroom above the rail is essential to avoid premature conduction during normal operation.

Does NZQA6V8AXV5T2 meet IEC 61000-4-2 Level 4 ESD requirements?

Yes, NZQA6V8AXV5T2 is certified to IEC 61000-4-2 Level 4 for both contact (±8 kV) and air discharge (±15 kV) ESD events. The device's clamping performance - ≤12 V at 13 A peak pulse current - was validated using the standardized 8/20 µs waveform, confirming its ability to protect sensitive downstream circuitry without degradation across repeated strikes.

How many protected lines does NZQA6V8AXV5T2 support, and how are they configured?

NZQA6V8AXV5T2 integrates four independent unidirectional ESD protection channels in a single SOT-553 package, with pins 1, 3, 4, and 5 serving as individual cathodes and pin 2 as the shared common anode. This configuration allows simultaneous protection of four signal lines - such as USB D+/D− plus VBUS detect and ID lines - while minimizing PCB real estate and interconnect inductance.

What is the typical junction capacitance of NZQA6V8AXV5T2 at zero bias?

The typical junction capacitance of NZQA6V8AXV5T2 is 6.7 pF at 0 V bias and 1 MHz, measured per diode. This low value ensures minimal impact on signal integrity for high-speed interfaces like USB 1.1 (12 Mbps) and low-speed CAN, and is confirmed in the official onsemi datasheet Figure 9. NZQA6V8AXV5T2 maintains this capacitance stability across temperature and bias conditions relevant to portable electronics operation.

Is NZQA6V8AXV5T2 compatible with lead-free reflow soldering processes?

Yes, NZQA6V8AXV5T2 is a Pb-free device packaged in SOT-553 and qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C for 10 seconds. Its termination finish and thermal design comply with JEDEC J-STD-020, and the device's R_JA of 327°C/W has been characterized on FR-4 boards with minimum copper pads - ensuring reliable assembly in high-volume manufacturing.