Diodes Incorporated PI3HDX12221ZLDEX

Overview

PI3HDX12221ZLDEX from Diodes Incorporated is a 2-to-1 active HDMI multiplexer switch with integrated linear redriver, supporting 4-channel HDMI up to 12 Gbps (HDMI 2.1). It delivers programmable CTLE equalization (+11 dB at 6 GHz), flat gain control, and output swing linearity adjustment in a 40-pin 3×6 mm TQFN package, deployed in high-resolution display interconnects between source and sink devices.

For engineers reviewing the PI3HDX12221ZLDEX datasheet, PI3HDX12221ZLDEX pinout, PI3HDX12221ZLDEX application, or PI3HDX12221ZLDEX equivalent, key selection criteria include HDMI 2.1 channel loss compensation capability, quad-level pin-strapped EQ/flat-gain configuration, single 3.3 V supply operation, and commercial temperature range support (0°C to +70°C).

Technical Context

The PI3HDX12221ZLDEX implements a non-blocking linear redriver architecture with input-side CTLE equalizers to suppress ISI jitter and compensate insertion loss across HDMI channels. Each of its four differential lanes supports independent equalization tuning via pin-strapped control logic.

It integrates combinational logic for quad-level gain selection (EQ: 0/+5/+8/+11 dB; flat gain: 0/+3/+6/+9 dB; output swing linearity: 4 settings), eliminating I²C or SPI interface overhead while enabling flexible board-level tuning without firmware dependency.

Key Specifications

Pinout & Package

The PI3HDX12221ZLDEX is housed in a 40-pin, 3 mm × 6 mm TQFN (ZLD) package with exposed thermal pad. Pin functions are defined per Diodes Incorporated's PI3HDX12221 datasheet Rev 2 (Feb 2020), with dedicated differential I/O pairs for two HDMI sources (ARX+/−, BRX+/−), one sink output (OUT+/−), power (VDD), and pin-strapped control terminals (EQ_SEL[1:0], FG_SEL[1:0], SWING_SEL[1:0], #PD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TI TDP158 and MAX9286, the PI3HDX12221ZLDEX offers lower latency, simpler power architecture, and board-level tuning via pin straps - making it optimal for cost-sensitive, space-constrained commercial HDMI 2.1 switches where deterministic signal restoration-not full retiming-is sufficient.

Availability

PI3HDX12221ZLDEX is available at Aetrix Electronics and suitable for digital television systems, gaming console docking stations, and laptop display expansion requiring stable component supply and HDMI 2.1 signal integrity assurance.

Supply support for PI3HDX12221ZLDEX 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in ASE, J-Devices, and Diodes' own facilities.

The PI3HDX12221 belongs to Diodes' ReDriver™ product line, engineered specifically for high-speed serial interface signal integrity restoration in consumer and computing display interconnects - prioritizing low-latency, pin-configurable tuning, and single-supply operation.

FAQ

Does PI3HDX12221ZLDEX support HDMI 2.1 Dynamic HDR and eARC?

Yes - the device transparently passes all HDMI 2.1 auxiliary data channels including Dynamic HDR metadata and eARC audio packets. Its linear redriver architecture preserves TMDS encoding integrity without altering packet structure or timing, enabling full feature compatibility when used within certified HDMI 2.1 source/sink ecosystems.

Can PI3HDX12221ZLDEX be used with DisplayPort signals?

No - PI3HDX12221ZLDEX is designed exclusively for HDMI TMDS signaling (DC-coupled, 3.3 V swing, specific common-mode voltage range). It does not meet DisplayPort's AC-coupled, 0.4–1.0 V differential swing, or link training requirements, and lacks DP-specific equalization profiles or AUX channel handling.

What is the thermal pad soldering requirement for the ZLD package?

The exposed thermal pad on the PI3HDX12221ZLDEX's 40-pin TQFN must be soldered to a minimum 12 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) to an internal ground plane. Diodes' recommended land pattern (0.5 mm stencil, 75% aperture ratio) ensures junction temperature remains ≤85°C at 3.3 V/12 Gbps full-load operation.

Is automatic input detection dependent on HDMI hot-plug detect (HPD) signaling?

No - input detection operates independently of HPD. The device monitors differential amplitude and transition density on ARX/BRX lanes using internal comparators. It triggers power-down when both inputs fall below 100 mVpp for >100 ms, regardless of HPD state - enabling low-power operation even during HPD assertion without active video.