Diodes Incorporated PI3USB103ZLEX

Overview

PI3USB103ZLEX from Diodes Incorporated is a single-channel, bidirectional 2:1 USB 2.0 high-speed (480 Mbps) analog switch with V_bus short-circuit tolerance, 3.0 Ω typical R_ON at 3.0 V, –33 dB crosstalk, and 250 ps propagation delay. It routes differential D+/D– signals between a USB host and one of two downstream ports in portable electronics requiring robust signal integrity and overvoltage protection.

For engineers reviewing the PI3USB103ZLEX datasheet, PI3USB103ZLEX pinout, PI3USB103ZLEX application, or PI3USB103ZLEX equivalent, key selection criteria include its 1400 MHz –3 dB bandwidth, ±4 kV IEC61000-4-2 ESD rating on data pins, rail-to-rail logic compatibility, and guaranteed off-isolation of –30 dB at 480 Mbps.

Technical Context

The PI3USB103ZLEX implements a low-capacitance, low-resistance CMOS analog switch architecture optimized for USB 2.0 differential signaling. Its 6.0 pF channel on-capacitance and 3.0 Ω R_ON minimize signal distortion, while the absence of PMOS parasitics at I/O pins eliminates supply sequencing constraints.

Control logic uses dual active-low enable (OE) and select (SEL) inputs to configure routing between M+/M– (multiplexer input) and either D+/D– or Y+/Y– outputs. All I/O pins tolerate shorts to 5 V V_bus regardless of V_DD state - including full operation at V_DD = 0 V - satisfying USB 2.0 overvoltage protection requirements.

Key Specifications

Pinout & Package

Package: 10-contact TQFN (ZL10), 1.3 mm × 1.6 mm × 0.75 mm, Pb-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 signal switching applications.

Compared with TS3USB30E and MAX14534A, the PI3USB103ZLEX delivers superior V_bus fault resilience, wider bandwidth headroom, and higher ESD immunity - making it optimal for compact, unshielded USB 2.0 interfaces in consumer handhelds where layout space limits external protection.

Availability

PI3USB103ZLEX is available at Aetrix Electronics and suitable for smartphone docking stations, tablet peripheral switching, USB-C alternate mode multiplexing, and industrial handheld test equipment requiring stable component supply and guaranteed long-term manufacturability.

Supply support for PI3USB103ZLEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and power management solutions for consumer, industrial, and computing markets.

The PI3USB103ZLEX belongs to Diodes' high-speed signal switch product line, engineered specifically for USB 2.0, MHL, and other differential interface applications demanding low R_ON, high isolation, and robust overvoltage protection.

FAQ

Can PI3USB103ZLEX operate with V_DD = 0 V while passing USB signals?

Yes. The device supports zero-power signal pass-through: when V_DD = 0 V, all I/O pins remain functional and tolerate V_bus shorts without leakage to the supply rail. This enables safe hot-plug operation and eliminates sequencing dependencies in battery-backed systems.

What is the maximum continuous current rating for the D+/D– and Y+/Y– pins?

The absolute maximum DC output current is 120 mA per pin, verified under steady-state conditions. However, for USB 2.0 high-speed signaling, peak current remains well below this limit due to the AC-coupled nature of the interface and typical 50 Ω termination.

Does PI3USB103ZLEX require external pull-up or pull-down resistors on SEL or OE?

No. SEL and OE have internal weak pull-downs (typical 100 kΩ) that ensure defined logic states when left floating. External resistors are unnecessary unless specific timing or noise immunity requirements demand stronger biasing.

How does the PI3USB103ZLEX handle mismatched trace lengths between D+ and D–?

The device itself does not compensate for PCB trace length mismatch. However, its 3.5 ps typical channel-to-channel skew ensures minimal added skew, preserving the ability of downstream USB PHYs to recover timing from the differential eye - provided board-level skew remains within USB 2.0 specification limits (≤100 ps).