Diodes Incorporated PI3DPX8121ZLDEX

Overview

PI3DPX8121ZLDEX from Diodes Incorporated is a 3.3V, 10Gbps 2-to-1 DisplayPort active mux switch with integrated linear redriver, supporting DP1.4 (8.1Gbps) and DP2.0 (10Gbps) per lane across four differential lanes. It features programmable CTLE (+10dB max at 5GHz), LTTPR-compliant redriver architecture, pin-strapped EQ/flat gain control, and operates from 0°C to +70°C in a 40-pin 3×6mm TQFN (ZLD) package for laptop docking and workstation display routing.

For engineers reviewing the PI3DPX8121ZLDEX datasheet, PI3DPX8121ZLDEX pinout, PI3DPX8121ZLDEX application, or PI3DPX8121ZLDEX equivalent, key selection criteria include lane count (4-lane DP), redriver data path type (LTTPR), equalizer gain range (+8.5dB to +10dB), flat gain adjustability, and TQFN-40 thermal performance under 3.3V supply.

Technical Context

The PI3DPX8121 implements a Link Training Transparent PHY Repeater (LTTPR) redriver data path, enabling end-to-end link training between source and sink while preserving pre-shoot and de-emphasis waveforms. Its CTLE equalizers at each input reduce ISI jitter and compensate channel loss up to 5GHz.

Combinational logic control via eight strap pins (EQ0–EQ2, AFS, BFS, #PD, and two others) enables quad-level selection of equalizer gain, flat gain, and output swing linearity-no I²C or register programming required. Input signal detection triggers automatic power-saving mode during idle periods.

Key Specifications

Pinout & Package

ZLD package is a 40-pin, 3×6mm thin quad flat no-lead (TQFN) with wettable flank leads and an exposed thermal pad for enhanced thermal dissipation in high-speed applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DisplayPort redriver mux applications.

Compared with TI TUSB546IRWBR and PI3DPX1202ZLCEX, the PI3DPX8121ZLDEX uniquely integrates 2-to-1 muxing and LTTPR redriving in a single 10Gbps-capable device-reducing component count, eliminating inter-chip timing skew, and enabling native DP2.0 link training transparency.

Availability

PI3DPX8121ZLDEX is available at Aetrix Electronics and suitable for laptop docking stations, workstation display routing, and KVM switch systems requiring stable component supply, high-speed signal integrity, and DP2.0 compliance.

Supply support for PI3DPX8121ZLDEX 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 ICs, specializing in high-performance signal integrity, power management, and protection solutions for computing and consumer electronics.

The PI3DPX8121 belongs to Diodes' DisplayPort redriver and mux product line, engineered specifically for next-generation DP2.0 infrastructure in compact form factors with minimal board space and thermal footprint.

FAQ

What is the maximum supported data rate per lane for PI3DPX8121ZLDEX?

The PI3DPX8121ZLDEX supports up to 10Gbps per lane (UHBR10), fully compliant with VESA DisplayPort 2.0 specifications. It also maintains backward compatibility with DP1.4 (8.1Gbps), HBR3 (8.1Gbps), HBR2 (5.4Gbps), and earlier modes without configuration changes.

Does PI3DPX8121ZLDEX require I²C or register programming?

No. The PI3DPX8121ZLDEX uses combinational logic pin strapping (EQ0–EQ2, AFS, BFS, #PD, etc.) for configuration-no serial interface, firmware, or register writes are needed. All settings are determined at power-up based on static pin states.

How does the LTTPR redriver functionality differ from standard redrivers?

Unlike conventional redrivers that regenerate signals independently, the PI3DPX8121ZLDEX implements LTTPR architecture: it passes link training packets transparently between source and sink, allowing the system's native transmitter and receiver to jointly optimize equalization-critical for DP2.0 UHBR10 reliability.

Is thermal pad soldering required for PI3DPX8121ZLDEX in ZLD package?

Yes. The ZLD package's exposed thermal pad must be soldered to a solid copper thermal plane on the PCB to maintain junction temperature within specification under full 10Gbps operation. Insufficient thermal relief causes gain compression and increased jitter above 85°C ambient.