Diodes Incorporated PI3EQX16021ZLDEX

Overview

PI3EQX16021ZLDEX from Diodes Incorporated is a 16Gbps, 4-channel PCIe 4.0-compliant Mux ReDriver with linear equalization, 2:1 multiplexing, 100Ω differential CML I/Os, and independent per-channel configuration of receiver EQ, output swing, and flat gain - deployed in desktop, IPC, and motherboard signal integrity extension paths.

For engineers reviewing the PI3EQX16021ZLDEX datasheet, PI3EQX16021ZLDEX pinout, PI3EQX16021ZLDEX application, or PI3EQX16021ZLDEX equivalent, key selection criteria include PCIe 4.0 compliance, 2:1 mux topology, per-channel programmable equalization, I²C + pin-strap configuration, and 3.3V supply operation across 0°C to 70°C.

Technical Context

The PI3EQX16021ZLDEX implements a transparent, rate- and coding-agnostic redriving architecture that preserves PCIe 4.0 link training while compensating for channel loss via programmable linear equalization. It supports four independent differential channels, each with automatic receiver detect, output squelch, and adaptive power management.

Its 2:1 mux functionality enables dynamic routing of two upstream lanes to one downstream path per channel pair, using either pin-strapped or I²C-controlled address selection (3-bit I²C address). All I/Os are 100Ω differential CML compatible with standard PCIe 4.0 physical layer signaling.

Key Specifications

Pinout & Package

ZLD40 (TQFN), 40-pin, 3 mm × 6 mm, 0.4 mm pitch, exposed thermal pad - optimized for high-speed signal integrity and thermal dissipation on dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe 4.0 redriver applications.

Compared with TI TUSB1042IRGET and Renesas uPD720212, the PI3EQX16021ZLDEX uniquely combines PCIe 4.0 redriving, 2:1 mux capability, and per-channel EQ in a single 3.3 V, 40-pin TQFN package - making it optimal for signal extension where protocol transparency and hardware-selectable routing are mandatory.

Availability

PI3EQX16021ZLDEX is available at Aetrix Electronics and suitable for desktop motherboards, industrial PCs, and embedded AI accelerators requiring stable component supply and PCIe 4.0 signal integrity assurance.

Supply support for PI3EQX16021ZLDEX 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 signal integrity, power management, and protection solutions for high-speed digital systems.

The PI3EQX16021 belongs to Diodes' ReDriver™ product line, engineered specifically for PCIe 4.0 and high-speed serial link extension in commercial computing platforms with emphasis on low power, configurability, and layout flexibility.

FAQ

Does PI3EQX16021ZLDEX require external configuration to operate?

No. The device operates with default settings upon power-up: fixed equalization, nominal output swing, and flat gain. Pin-strapping sets basic mode (e.g., I²C enable/disable, default address), while I²C allows runtime tuning of all signal parameters without reset. No external EEPROM or firmware is needed for basic PCIe 4.0 redriving.

Can PI3EQX16021ZLDEX be used in PCIe 5.0 systems?

No. The PI3EQX16021ZLDEX is specified and characterized only for PCIe 4.0 (16 Gbps). Its equalization profile, bandwidth, and jitter performance are not validated for PCIe 5.0 (32 Gbps) signaling. For PCIe 5.0, Diodes offers the PI3EQX22021 series, which supports up to 32 Gbps with enhanced EQ range.

What is the function of the SELx pins in 2:1 mux operation?

Each SELx pin controls the 2:1 multiplexer for its associated channel pair (e.g., SEL1 selects between CH1/CH2 inputs for CH1 output). When high, the first input (IN1) is routed; when low, the second input (IN2) is selected. This enables hardware-level lane failover or source switching without I²C interaction.

How does automatic receiver detect impact system power management?

Automatic receiver detect monitors differential input amplitude per channel. If signal falls below threshold for >100 µs, the output is squelched and bias current reduced, cutting channel power by ~40%. This lowers idle power in multi-slot systems where some PCIe links remain unpopulated or inactive.