Diodes Incorporated PI3EQX16012ZLDEX

Overview

PI3EQX16012ZLDEX from Diodes Incorporated is a 16Gbps, 4-channel PCIe 4.0-compliant 1:2 DeMux ReDriver in a 40-pin ZLD (TQFN, 3mm × 6mm) package. It provides programmable linear equalization, output swing, and flat gain per channel, supports 100Ω differential CML I/Os, operates at 3.3V supply, and functions across 0°C to 70°C - deployed on desktop motherboards and IPC backplanes for signal integrity restoration across extended PCB traces.

For engineers reviewing the PI3EQX16012ZLDEX datasheet, PI3EQX16012ZLDEX pinout, PI3EQX16012ZLDEX application, or PI3EQX16012ZLDEX equivalent, key selection criteria include PCIe 4.0 compliance, per-channel independent configuration via I²C or pin strap, automatic receiver detect, rate-agnostic operation, and adaptive power management for low-power platform integration.

Technical Context

The PI3EQX16012ZLDEX implements four fully independent differential channels with linear equalization circuitry before each receiver stage, enabling compensation of high-frequency loss in long or lossy interconnects. Each channel features configurable input equalization, output swing, and flat gain - adjustable via either hardware pin strapping or I²C interface with 3 selectable address bits.

It supports transparent link training and is coding-agnostic, preserving PCIe 4.0 protocol integrity without modifying data content. The device uses 100Ω differential CML I/Os and includes per-channel low-level input detection and output squelch, ensuring robust signal presence handling and noise suppression during idle states.

Key Specifications

Pinout & Package

Package: ZLD40 - 40-pin, 3mm × 6mm TQFN with exposed thermal pad, RoHS-compliant and halogen/antimony-free ("Green").

Key Features

Applications

Equivalent & Alternatives

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

Compared with TI TUSB1042IRNQT and MAX96752GTJ+T, the PI3EQX16012ZLDEX delivers dedicated 1:2 DeMux functionality with per-channel linear equalization and no protocol multiplexing overhead - making it optimal for PCIe 4.0-only, high-density motherboard and IPC signal integrity restoration where configurability and transparency are critical.

Availability

PI3EQX16012ZLDEX is available at Aetrix Electronics and suitable for desktop motherboard design, industrial PC backplane interconnect, and workstation GPU expansion requiring stable component supply and PCIe 4.0 signal integrity assurance.

Supply support for PI3EQX16012ZLDEX 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 signal integrity, power management, and interface solutions for computing and industrial markets.

The PI3EQX series targets high-speed serial link conditioning for PCIe, USB, and SATA applications - designed specifically to extend reach and restore eye diagrams in space-constrained, thermally sensitive platforms without protocol intervention.

FAQ

Does the PI3EQX16012ZLDEX require external configuration to operate?

No. The device powers up with default settings enabling basic 16Gbps operation. Pin-strapped configuration (via ADDR and EN pins) provides immediate functional setup without I²C initialization. I²C is optional for fine-grained tuning of equalization, swing, and flat gain per channel - used only when optimizing for specific channel loss profiles.

Can the PI3EQX16012ZLDEX be used in PCIe 5.0 systems?

No. It is specified and characterized only for PCIe 4.0 (16Gbps). Its linear equalization architecture and bandwidth response are optimized for up to 8GHz fundamental frequency. At PCIe 5.0's 32Gbps (16GHz), insertion loss compensation and jitter performance fall outside guaranteed specifications - use Diodes' PI3EQX16912 or equivalent PCIe 5.0-qualified ReDrivers instead.

What is the role of the ADJ pin, and how is it configured?

ADJ sets internal bias current for CML output driver calibration. A single external resistor (typically 10kΩ to 50kΩ) between ADJ and GND configures nominal output swing. Values outside 5kΩ–100kΩ cause out-of-spec amplitude or increased jitter. Resistor tolerance must be ≤1% to maintain channel-to-channel swing matching within ±5%.

Is thermal pad soldering required for reliable operation?

Yes. The ZLD40 package includes an exposed thermal pad that must be soldered to a solid copper thermal plane on the PCB. Without this connection, junction temperature exceeds 110°C under full 4-channel 16Gbps operation at 70°C ambient - violating SOA limits and risking parametric drift or premature failure. Minimum recommended thermal pad area is 25 mm² with ≥4 thermal vias.