Nexperia USA Inc. NXS0506GUX

Overview

NXS0506GUX from Nexperia is an SD 3.0-compatible bidirectional dual-supply level translator with integrated auto-direction control, EMI filtering, and IEC 61000-4-2 Level 4 ESD protection (8 kV contact / 15 kV air on memory card pins). It interfaces host systems (1.1–1.95 V) with SD/microSD/MMC cards (1.7–3.6 V), supporting SDR104 (208 MHz), DDR50, and all legacy SD modes. Used in smartphone memory card slots to enable high-speed, robust host-to-card signal translation.

For engineers reviewing the NXS0506GUX datasheet, NXS0506GUX pinout, NXS0506GUX application, or NXS0506GUX equivalent, key selection criteria include auto-direction sensing capability, 208 MHz clock support, integrated 70 kΩ host-side pull-ups, zero-clamping ESD architecture, and dual-package availability (XQFN16/SOT1161-1).

Technical Context

The NXS0506GUX implements a voltage-level-agnostic, auto-sensing bidirectional translation architecture where direction detection occurs per channel (CMD, DAT0–DAT3) without host-side control signals. Its feedback clock path (CLKA → CLKFB) compensates for PCB trace delay to preserve timing margins during card-read operations at up to 208 MHz.

It integrates on-die EMI filters on all I/Os to suppress higher harmonics, and employs a zero-clamping ESD protection scheme that routes stress from memory card pins directly to GND-preventing ESD transients from reaching the host side. The device enables automatically when VCCB exceeds 1.2 V and disables below 0.65 V.

Key Specifications

Pinout & Package

The NXS0506GUX is packaged in a 16-terminal XQFN16 (SOT1161-1) with 0.4 mm pitch, 1.80 × 2.60 × 0.50 mm body, and wettable flanks for automated optical inspection. Pin numbering follows standard quad-flat orientation with terminal 1 index marked.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SD card level translation applications.

Compared with TXS0108E and SN74AVC4T245, the NXS0506GUX uniquely combines SDR104 timing support, integrated EMI filtering, IEC-level ESD protection, and CLKFB-based delay compensation-making it the only single-chip solution qualified for production-grade UHS-I/UHS-II card readers in mobile platforms.

Availability

NXS0506GUX is available at Aetrix Electronics and suitable for smartphone memory interfaces, tablet SD card readers, digital camera expansion slots, and laptop embedded card readers requiring stable component supply across high-volume consumer electronics programs.

Supply support for NXS0506GUX 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets.

The NXS0506 belongs to Nexperia's SD/microSD interface solutions product line, engineered specifically to simplify high-speed memory card integration in space-constrained, ESD-sensitive portable devices while eliminating discrete translation and protection components.

FAQ

What is the function of the CLKFB pin?

The CLKFB (clock feedback) pin delivers a delayed copy of the CLKB signal back to the host side to compensate for PCB trace propagation delay. This preserves timing margins during high-speed card-read operations-especially critical at SDR104 (208 MHz)-by enabling the host to align sampling edges with incoming data, eliminating the need for complex deskew logic in the host controller.

Can the DAT0A and DAT1A pins be swapped on the PCB?

Yes, DAT0A and DAT1A (and all DATnA/DATnB and CMDA/CMDB pairs) are functionally identical per datasheet Section 9.6. Their internal circuitry is matched, allowing pin-swapping to ease routing congestion or improve signal symmetry-without affecting SD protocol compliance, timing, or ESD performance.

Does NXS0506GUX require external pull-up resistors on the host side?

No. The device integrates 70 kΩ (typ.) pull-up resistors on all host-side I/O pins (CMDA, DAT0A–DAT3A, CLKA), eliminating the need for external components. This reduces BOM count, PCB area, and potential signal integrity issues caused by parasitic inductance in discrete resistor layouts.

How does the zero-clamping ESD architecture protect the host system?

The zero-clamping architecture routes ESD transients from memory card-side pins (DAT0B–DAT3B, CMDB, CLKB) directly to GND through internal low-impedance paths-bypassing the level-shifting core entirely. This prevents voltage overshoot on host-side pins (DAT0A–DAT3A, CMDA), ensuring host SoCs and PMUs remain undamaged even under 15 kV air-discharge events.