Nexperia USA Inc. NXS0506UPAZ

Overview

NXS0506UPAZ 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. It interfaces host processors (1.1 V–1.95 V) with SD/microSD/MMC cards (1.7 V–3.6 V), supports SDR104 (208 MHz), and operates across –40 °C to +85 °C in a 16-bump WLCSP16 package (1.455 × 1.455 × 0.43 mm).

For engineers reviewing the NXS0506UPAZ datasheet, NXS0506UPAZ pinout, NXS0506UPAZ application, or NXS0506UPAZ equivalent, this device addresses high-speed SD 3.0 signal integrity challenges including clock feedback path compensation, zero-clamping ESD architecture, and integrated pull-up resistors eliminating external components in mobile memory card interface designs.

Technical Context

The NXS0506UPAZ implements auto-direction sensing logic that detects data flow direction (host-to-card or card-to-host) without external control signals, enabling seamless operation in SDR104, DDR50, and legacy SD modes. Its dual-rail architecture maintains independent VCCA (host) and VCCB (card) supplies, with automatic enable/disable triggered by VCCB crossing 0.9 V (enable) and 0.65 V (disable).

It integrates dedicated CLKFB feedback channel to compensate for PCB trace delay in read-mode timing paths, critical for maintaining setup/hold margins at 208 MHz. All I/Os include on-die EMI filters (5 pF host-side, 12 pF card-side) and robust ESD protection: 8 kV contact / 15 kV air discharge on card-side pins per IEC 61000-4-2 Level 4.

Key Specifications

Pinout & Package

Package: WLCSP16 (SOT8025-1), 1.455 × 1.455 × 0.43 mm body, 0.35 mm bump pitch, backside coating applied.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SD 3.0 level translation applications.

Compared with NXS0506GU, the NXS0506UPAZ offers 0.07 mm lower profile and superior thermal performance for space-constrained mobile designs; versus TXS0108E, it delivers SD 3.0-specific features-CLKFB, EMI filters, and Level 4 ESD-that eliminate four external components and ensure compliance in certified end products.

Availability

NXS0506UPAZ is available at Aetrix Electronics and suitable for smartphone memory interfaces, digital camera card slots, tablet PC expansion slots, and laptop SD card readers requiring stable component supply across automotive-qualified temperature ranges and high-volume production cycles.

Supply support for NXS0506UPAZ 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 delivering high-performance, reliable, and energy-efficient components for automotive, industrial, mobile, and computing applications, with leadership in logic, discrete, and MOSFET technologies.

The NXS0506 product line targets high-speed memory card interface challenges in portable electronics, integrating level translation, ESD protection, EMI filtering, and auto-direction control into single-chip solutions optimized for SD 3.0 SDR104 and DDR50 compliance.

FAQ

Can NXS0506UPAZ support both SD 2.0 and SD 3.0 modes simultaneously?

No. The device operates in a single selected mode determined by host controller configuration-not hardware-switched. It supports all SD 3.0 modes (SDR104, SDR50, DDR50, etc.) and backward-compatible SD 2.0 High-Speed (50 MHz) and Default-Speed (25 MHz) modes, but mode selection is handled entirely by the host's SDHCI controller firmware and clock rate programming. The NXS0506UPAZ transparently translates signals across the full supported voltage and frequency range without mode-specific configuration.

Is CLKFB pin mandatory for functional operation?

No. CLKFB is optional and may be left floating if the host controller does not implement clock feedback-based timing recovery. When used, it improves read-mode timing margin at SDR104 speeds by compensating for PCB trace delay between CLKA and CLKB. Omitting CLKFB reduces pin count and layout complexity but requires tighter PCB trace length matching and may limit maximum achievable data rate in marginal layouts.

What is the impact of using VCCA = 1.1 V and VCCB = 3.3 V on propagation delay?

At VCCA = 1.1 V and VCCB = 3.3 V, the typical host-to-card propagation delay (DATnA → DATnB) is 2.2 ns, with a maximum of 4.0 ns. This represents the fastest delay condition among all voltage combinations, enabling tighter timing budgets in high-speed read operations. The device guarantees timing performance across all valid VCCA/VCCB pairs per Table 9, with worst-case skew held to ≤200 ps for matched channels.

Does NXS0506UPAZ require external decoupling capacitors?

Yes. Two 100 nF X7R ceramic capacitors are required: one between VCCA and GND near the WLCSP16 pad array, and another between VCCB and GND. These must be placed within 2 mm of their respective power bumps to maintain low-impedance supply paths for high-frequency switching currents. The device does not integrate bulk capacitance; omitting these capacitors causes voltage droop and signal integrity degradation above 50 MHz.