Diodes Incorporated PI3EQX5801ZDEX

Overview

PI3EQX5801ZDEX from Diodes Incorporated is a PCIe 1.0/2.0-compliant 1-lane ReDriver supporting 2.5/5.0 Gbps data rates, featuring programmable equalization, de-emphasis, and output swing control via I²C interface, with dual 100Ω differential CML I/Os and input signal detection for blade server interconnects.

For engineers reviewing the PI3EQX5801ZDEX datasheet, PI3EQX5801ZDEX pinout, PI3EQX5801ZDEX application, or PI3EQX5801ZDEX equivalent, key selection criteria include PCIe 2.0 signal integrity restoration, I²C-configurable EQ/de-emphasis settings, dual-channel squelch behavior, 1.5V/3.3V dual-supply operation, and TQFN-20 thermal performance in high-density server backplanes.

Technical Context

The PI3EQX5801ZDEX implements a two-stage analog signal conditioning architecture: a limiting amplifier with adjustable input equalization followed by a programmable output driver with de-emphasis and swing control. Each channel operates independently with dedicated input threshold detection (Vth−) and common-mode squelch activation.

It supports both pin-strapped and I²C-controlled configuration modes. In I²C mode (I2C_EN = 1), registers configure per-channel equalization gain (0–15 dB), de-emphasis level (0–9 dB), and output swing (400–800 mVpp), enabling real-time adaptation to varying channel loss profiles across PCIe 2.0 links.

Key Specifications

Pinout & Package

Package: 20-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 PCIe ReDriver applications.

Compared with TI TUSB211IRWBR and Maxim MAX3815AETE+, the PI3EQX5801ZDEX uniquely delivers PCIe 2.0–validated signal conditioning with per-channel squelch, dual-supply efficiency, and field-programmable EQ/de-emphasis-making it the only option for thermally constrained, multi-drop PCIe 2.0 backplane extension.

Availability

PI3EQX5801ZDEX is available at Aetrix Electronics and suitable for blade server backplane extension, PCIe 2.0 active cable assemblies, and industrial PCIe switch fabric applications requiring stable component supply and long-term lifecycle support.

Supply support for PI3EQX5801ZDEX 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 solutions for power management, signal integrity, and connectivity applications.

The PI3EQX5801ZDEX belongs to Diodes' high-speed interface product line, engineered specifically to solve PCIe 1.0/2.0 signal degradation in space-constrained, thermally demanding server and storage platforms.

FAQ

Does PI3EQX5801ZDEX support PCIe 3.0 or higher data rates?

No. The PI3EQX5801ZDEX is specified only for PCIe 1.0 (2.5 Gbps) and 2.0 (5.0 Gbps) protocols. It lacks the bandwidth, jitter tolerance, and equalization depth required for PCIe 3.0 (8 GT/s) or later generations. Its analog front-end and output driver are optimized for 5.0 Gbps NRZ signaling with defined eye mask compliance.

Can PI3EQX5801ZDEX operate with only one supply voltage?

No. The device requires both VDD15 (1.5 V) for the analog signal path and VDD33 (3.3 V) for I/O buffers and logic. Omitting either rail causes functional failure: missing VDD15 disables equalization and limiting amplifiers; missing VDD33 prevents I²C communication and output driver activation.

What is the function of the EQ_x pins when I2C_EN is high?

When I2C_EN = 1, the EQ_x pins are ignored. All equalization, de-emphasis, and output swing settings are controlled exclusively via I²C register writes. The EQ_x pins serve only as a fallback configuration method when I²C_EN = 0, providing eight fixed EQ levels through 3-bit encoding.

Is the thermal pad on the TQFN-20 package electrically connected?

Yes. The exposed thermal pad is internally connected to GND and must be soldered to a solid PCB ground plane. This connection provides both thermal dissipation (critical for 150–330 mW operation) and RF return path integrity for the high-speed CML signals, directly impacting jitter performance and EMI emissions.