Diodes Incorporated PI3USB42ZMEX

Overview

PI3USB42ZMEX from Diodes Incorporated is a USB 2.0 high-speed (480 Mbps) analog signal switch with integrated VBUS short-circuit protection, designed for USB data path routing in portable and embedded systems. It features dual 2:1 differential channel switching (D+/D− to D+A/D−A or D+B/D−B), 5.25 V DC switch voltage rating, <1.5 Ω typical on-resistance at 3.3 V, and supports industrial temperature range (−40°C to +105°C).

For engineers reviewing the PI3USB42ZMEX datasheet, PI3USB42ZMEX pinout, PI3USB42ZMEX application, or PI3USB42ZMEX equivalent, this device is selected for USB port multiplexing where signal integrity, low insertion loss, and robust overvoltage protection are critical - especially in docking stations, USB-C alternate mode switches, and multi-peripheral host interfaces.

Technical Context

The PI3USB42ZMEX implements a CMOS-based bidirectional analog switch architecture optimized for USB 2.0 differential signaling. Its logic-controlled SEL and /OE inputs enable deterministic 2:1 channel selection with break-before-make timing, while internal ESD protection exceeds 8 kV HBM on all I/O pins.

It operates from a single 3.0–4.5 V supply, supports full-speed and high-speed USB data rates without signal degradation (verified via eye diagram compliance at 480 Mbps), and integrates VBUS fault detection that disables the switch when D+/D− pins exceed 5.25 V relative to ground - preventing damage during VBUS shorts.

Key Specifications

Pinout & Package

PI3USB42ZMEX is housed in a 10-contact Ultra-thin Quad Flat No-Lead (UQFN) package (3 mm × 2 mm, 0.4 mm pitch, 0.55 mm height), optimized for space-constrained USB interface routing.

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 MAX14534, PI3USB42ZMEX uniquely combines dual-channel USB 2.0 switching, sub-1.5 Ω RON, and autonomous VBUS short disable - making it optimal for compact, safety-aware USB routing where signal fidelity and fault resilience are co-prioritized.

Availability

PI3USB42ZMEX is available at Aetrix Electronics and suitable for USB docking stations, mobile USB-C Alt Mode implementations, industrial HMIs, and automotive infotainment hubs requiring stable component supply, RoHS 3 compliance, and tape-and-reel delivery.

Supply support for PI3USB42ZMEX 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 analog ICs, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.

The PI3USB42ZMEX belongs to Diodes' USB signal integrity product line, engineered specifically for robust, low-loss USB 2.0 switching in space- and reliability-constrained designs - emphasizing fault resilience, signal fidelity, and seamless integration with modern USB-C ecosystems.

FAQ

Does PI3USB42ZMEX support USB 3.0 SuperSpeed signals?

No. PI3USB42ZMEX is designed exclusively for USB 2.0 high-speed (480 Mbps) differential signaling. Its bandwidth, capacitance, and routing architecture do not meet USB 3.0 Gen 1 (5 Gbps) requirements. For SuperSpeed applications, Diodes offers separate USB 3.x switch families such as the PI3DBxx series.

What happens when VBUS shorts to D+ or D−?

When either D+ or D− exceeds +5.25 V relative to GND, the internal VBUS fault detector triggers immediate switch disable - placing all channels in high-impedance state within nanoseconds. This prevents current injection into the USB PHY and avoids latch-up, preserving system-level functionality after fault clearance.

Can /OE and SEL be driven directly from a 1.8 V microcontroller GPIO?

Yes. Both /OE and SEL inputs are overvoltage-tolerant and recognize logic-low below 0.8 V and logic-high above 2.0 V across the full VDD range (3.0–4.5 V). A 1.8 V GPIO output meets the high-level threshold when VDD ≥ 3.0 V, enabling direct interfacing without level-shifting circuitry.

Is thermal derating required at maximum ambient temperature?

At TA = +105°C and full 120 mA load per channel, junction temperature remains within 125°C limit assuming standard 2-layer PCB with 1-inch² copper pour under the UQFN pad. No additional heatsinking is required, but thermal vias to inner ground planes are recommended for sustained high-current operation in sealed enclosures.