Diodes Incorporated PI3EQX7502MZDEX

Overview

PI3EQX7502MZDEX from Diodes Incorporated (acquired Pericom) is a USB 3.0-compliant 5.0 Gbps single-port ReDriver IC with programmable equalization, de-emphasis, and input threshold control. It conditions differential CML signals across PCB traces, cables, or connectors in host-to-peripheral links, supporting two 100Ω differential I/O pairs and operating from a single 3.3V supply at -40°C to +85°C.

For engineers reviewing the PI3EQX7502MZDEX datasheet, PI3EQX7502MZDEX pinout, PI3EQX7502MZDEX application, or PI3EQX7502MZDEX equivalent, key selection criteria include its 5.0 Gbps per-lane throughput, independent channel squelch with Vth- detection, auto-slumber mode timing (7.3 ms idle), receiver detect enable via RXD-EN, and TQFN-24 (4×4 mm) thermal performance.

Technical Context

The PI3EQX7502MZDEX implements a two-channel, fully independent CML signal conditioning architecture with integrated limiting amplifiers and adjustable equalization per input path. Each channel features dedicated EN_x# control, input signal level detection against programmable Vth-, and output squelch to common-mode voltage upon threshold violation.

Its receiver detect loop activates when RXD-EN is high and resets after ≥7.3 ms of channel inactivity, transitioning to Unplug Mode if no load is detected or returning to Slumber Mode otherwise. Power management includes Standby (EN_x# = 1), Slumber (auto-triggered low-power state), and active operation consuming ~330 mW total.

Key Specifications

Pinout & Package

Package: 24-pin TQFN (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.0 signal conditioning applications.

Compared with TUSB21x and USB3202, the PI3EQX7502MZDEX delivers autonomous, hardware-based signal health monitoring and adaptive power gating-reducing host software overhead and enabling robust operation in mechanically unstable or thermally constrained USB 3.0 extension paths.

Availability

PI3EQX7502MZDEX is available at Aetrix Electronics and suitable for USB 3.0 docking stations, industrial machine vision interfaces, and multi-function peripheral hubs requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for PI3EQX7502MZDEX 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 acquired Pericom Semiconductor in 2017 and integrates its high-speed interface portfolio into signal integrity solutions for USB, PCIe, HDMI, and DisplayPort applications.

The PI3EQX7502MZDEX belongs to Pericom's ReDriver™ family, engineered specifically to restore degraded USB 3.0 SuperSpeed signals in space-constrained, thermally demanding host-peripheral interconnects.

FAQ

What is the function of the RXD-EN pin?

RXD-EN enables the hardware-based receiver detection loop. When pulled high, it activates automatic load presence sensing per channel. After ≥7.3 ms of inactivity, the device checks for load; absence triggers Unplug Mode, while presence returns it to Slumber Mode. This eliminates need for host-driven polling during cable disconnect events.

How does the PI3EQX7502MZDEX handle signal loss during hot-unplug?

Upon hot-unplug, input signal amplitude drops below the Vth- threshold. The IC immediately activates squelch, driving XO+/XO- to common-mode voltage. This prevents downstream receivers from interpreting noise as valid data, avoiding link training errors or enumeration glitches in connected peripherals.

Can EQ_1 and EQ_2 be set to different levels simultaneously?

Yes. EQ_1 and EQ_2 are independent pin-strapped inputs, allowing distinct equalization gain settings per channel. This supports asymmetric channel loss profiles-for example, when one lane traverses longer PCB traces while the other connects directly to a nearby connector-without requiring shared configuration.

Is the exposed thermal pad on the TQFN-24 package required to be soldered?

Yes. The exposed pad is electrically connected to GND and serves as the primary thermal path. Diodes Incorporated's datasheet specifies mandatory soldering to a thermal land on the PCB with ≥60% coverage and at least four thermal vias to inner ground planes to maintain junction temperature within -40°C to +85°C ambient limits.