Diodes Incorporated PI3EQX10312ZHEX

Overview

PI3EQX10312ZHEX from Diodes Incorporated is a 10Gbps, 2-port USB 3.1 Gen 2 ReDriver with integrated USB-C detector, supporting both pin-control and I²C configuration modes. It provides signal integrity compensation (7–13.5 dB peaking gain at 5 GHz), configurable input/output terminations (50 Ω to VDD or 75 kΩ to GND), and dual-role port detection (SRC/SNK/DRP) with current-mode identification (Default/1.5A/3A). It is used in USB-C docking stations requiring robust high-speed signal regeneration and Type-C role negotiation.

For engineers reviewing the PI3EQX10312ZHEX datasheet, PI3EQX10312ZHEX pinout, PI3EQX10312ZHEX application, or PI3EQX10312ZHEX equivalent, key selection considerations include its 10Gbps eye opening (0.646 UI at 10Gbps), integrated CC1/CC2 detection with 5.1 kΩ Rd pulldown, VBUS detection threshold (1.7–2.7 V), and low-power U2/U3 mode current (0.5–0.6 mA).

Technical Context

The PI3EQX10312ZHEX implements a dual-path ReDriver architecture with independent equalization (EQ0/EQ1) and flat-gain (FG) control per channel (AP and CON sides), enabling adaptive compensation for varying PCB trace loss. Its USB-C detector operates autonomously or under I²C register control, supporting DRP advertisement timing (50–100 ms) and VCONN switching (1 Ω R_ON, 500–650 mA output).

It features four-level analog control inputs (SW/FG/EQ) with precise voltage thresholds (e.g., VIH = 0.92×VDD3P3), differential AC-coupled I/O (75–265 nF coupling caps), and multi-mode power management including hardware-enforced power-down (ENB active-low) and register-controlled power saving (bit [7] of Control Register).

Key Specifications

Pinout & Package

PI3EQX10312ZHEX is housed in a 38-pin TQFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad (Pin 1) for enhanced thermal dissipation in high-speed applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.1 Gen 2 ReDriver with USB-C detection applications.

Compared with PI3EQX10312ZHEX, PI3EQX10612ZHEX offers measurable improvements in power efficiency and jitter performance while maintaining drop-in compatibility, whereas TUSB1002AIRGET trades integration for temperature resilience and vendor lock-in.

Availability

PI3EQX10312ZHEX is available at Aetrix Electronics and suitable for USB-C docking stations, mobile workstation hubs, industrial HMIs, and embedded host systems requiring stable component supply and long-term obsolescence management.

Supply support for PI3EQX10312ZHEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The PI3EQX10312ZHEX belongs to Diodes' Pericom-branded high-speed interface product line, designed specifically for USB-C ecosystem solutions requiring integrated signal conditioning and protocol-aware port control.

FAQ

What is the function of the SRC_CUR pin (Pin 2) and how does it affect USB-C source current mode?

The SRC_CUR pin is a tri-level input that configures the USB-C source current capability during power-up: floating sets 1.5A mode, VDD sets 3A mode, and GND selects Default (500mA) mode. This directly maps to bits [6:5] of Register 01H and determines the Rp value presented on CC lines-enabling hardware-only current negotiation without I²C intervention.

Can PI3EQX10312ZHEX operate in pin-control mode without I²C communication?

Yes. With ADDR1/ADDR0 tied to specific resistor dividers (e.g., 8.2kΩ to GND), the device enters pin-control mode and uses PORT0/PORT1 and SRC_CUR to configure port role and current mode at startup. All ReDriver EQ/FG/SW settings are then controlled via analog voltage inputs-eliminating firmware dependency for basic operation.

How does the RXDET_EN pin (Pin 12) impact ReDriver loading detection behavior?

RXDET_EN enables or disables automatic receiver load detection: when high (default), the ReDriver monitors RX_CON1/2 inputs and adjusts equalization based on detected termination; when low, this feature is disabled and fixed EQ settings apply. This allows deterministic tuning in known-impedance systems or dynamic adaptation in variable-cable environments.

What thermal management provisions exist for PI3EQX10312ZHEX in continuous 10Gbps operation?

The device includes thermal shutdown at 155°C (±0°C hysteresis) and relies on its exposed thermal pad (Pin 1) soldered to a ≥100 mm² PCB copper pour. At full 10Gbps operation with 1.2 Vppd output, typical power dissipation is ~320 mW-requiring ≤25°C/W board-level thermal resistance to maintain junction temperature below 105°C at 70°C ambient.