NXP Semiconductors NX20P0477UKZ

Overview

NX20P0477UKZ from NXP Semiconductors is a single-chip USB Type-C CC line overvoltage protection IC with integrated anti-moisture corrosion prevention. It provides 28 V DC tolerance on CON_CC1/CON_CC2, 60 ns OVP turn-off time, <1 µA CC1/CC2 leakage current, and operates across –40°C to +85°C in a WLCSP-9 package. It protects smartphone and tablet port controllers from VBUS-induced shorts and moisture-triggered electrochemical corrosion.

For engineers reviewing the NX20P0477UKZ datasheet, NX20P0477UKZ pinout, NX20P0477UKZ application, or NX20P0477UKZ equivalent, key selection criteria include its 250 mΩ R_DS(ON), ±40 V surge rating on CC lines, IEC 61000-4-2 ESD immunity (8 kV contact / 15 kV air), ultra-low 2.5 µA standby current source, and tap-water detection logic that holds FLAGB low during moisture events.

Technical Context

The NX20P0477UKZ integrates dual bidirectional analog switches between system-side CC1/CC2 and connector-side CON_CC1/CON_CC2, each with 250 mΩ R_DS(ON) and fast 60 ns overvoltage disconnect response. Its internal current source delivers 2.5 µA (typical) during standby-replacing standard USB-PD Rp currents (80/180/330 µA)-to suppress galvanic corrosion in humid environments.

It implements a three-stage detection sequence (startup, standby, tap water detection) with TSRC_WAIT and TCC_DEB timing windows, enabling reliable water presence identification via voltage ramp monitoring on CON_CC pins. The Rd clamp circuit ensures safe operation during dead-battery conditions, while FLAGB provides open-drain fault signaling.

Key Specifications

Pinout & Package

Package: WLCSP-9, 1.49 × 1.49 × 0.555 mm, 0.4 mm pitch, bottom-side solder bumps.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB Type-C CC line protection applications.

Compared with TPD6S300A and NCP392, the NX20P0477UKZ uniquely integrates tap-water detection, ultra-low 2.5 µA standby current sourcing, and dual independent 28 V/60 ns switches-enabling robust, maintenance-free USB-C port protection in high-humidity consumer and medical devices without external components.

Availability

NX20P0477UKZ is available at Aetrix Electronics and suitable for smartphones, tablets, and portable medical monitors requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-2 ESD and USB-IF Type-C specifications.

Supply support for NX20P0477UKZ 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The NX20P0477UKZ belongs to NXP's USB Type-C Protection portfolio, designed specifically to address electrochemical corrosion, VBUS-coupled overvoltage, and moisture-induced false sink detection in compact mobile and portable USB-C interfaces.

FAQ

What is the primary function of the NX20P0477UKZ in a USB Type-C system?

The NX20P0477UKZ serves as a dual-channel CC line protection IC that prevents overvoltage damage, electrochemical corrosion, and false sink detection in USB Type-C ports. It actively monitors CON_CC1/CON_CC2 for 28 V transients and moisture, disconnects within 60 ns, and replaces standard Rp currents with a 2.5 µA corrosion-inhibiting source-making it essential for reliable port operation in smartphones and tablets where environmental exposure is common. The NX20P0477UKZ integrates this functionality in a 1.49 mm × 1.49 mm WLCSP package.

How does the NX20P0477UKZ detect tap water on the USB-C connector?

The NX20P0477UKZ detects tap water through a timed voltage-ramp analysis on CON_CC pins. When water bridges the pins, the device enters TSRC_WAIT and then TCC_DEB windows, enabling its internal current source to raise CON_CC voltage. If the resulting ramp profile matches water signature-not a valid sink-the switch remains off and FLAGB is pulled low. This behavior is confirmed in NX20P0477FS REV 0, and the NX20P0477UKZ executes it autonomously without host intervention.

Does the NX20P0477UKZ require external components for basic operation?

No, the NX20P0477UKZ operates autonomously with only VSYS supply and GND-no external resistors, capacitors, or TVS diodes are needed for core OVP, corrosion prevention, or moisture detection. Its integrated 2.5 µA current source, Rd clamp, and ±40 V surge protection eliminate typical external BOM items. However, an external pull-up on FLAGB is required for host notification, and decoupling capacitance (e.g., 1 µF) on VSYS is recommended per NX20P0477FS REV 0. The NX20P0477UKZ is optimized for minimal footprint and maximum integration.

What is the significance of the 250 mΩ R_DS(ON) specification in the NX20P0477UKZ?

The 250 mΩ R_DS(ON) ensures minimal voltage drop and signal attenuation across the CC path during normal USB-PD communication, preserving signal integrity for Rp/Rd detection and PD message exchange. At typical CC currents (<100 µA), this results in <25 µV drop-well below USB-IF noise margins. Combined with 60 ns OVP response, this low on-resistance enables both high-fidelity signaling and instantaneous fault isolation. The NX20P0477UKZ achieves this while maintaining thermal safety in the 1.49 mm WLCSP package under continuous 5 V operation.

Can the NX20P0477UKZ be used in systems with dead-battery conditions?

Yes, the NX20P0477UKZ includes a dedicated Rd clamp circuit on CON_CC1/CON_CC2 that ensures safe biasing and prevents reverse current flow when VSYS = 0 V-such as during battery removal or deep discharge. This feature maintains port integrity and avoids latch-up or leakage paths that could drain residual battery charge. The NX20P0477UKZ remains in a known-safe state without external supervision, making it suitable for always-connected USB-C accessories and field-serviceable portable devices.