Diodes Incorporated PI3HDX412BDZBEX

Overview

PI3HDX412BDZBEX from Diodes Incorporated is an active HDMI 1.4b-compliant 1:2 TMDS splitter/demultiplexer IC designed for high-resolution video distribution at up to 3.4 Gbps per channel. It supports 4K@30Hz (4096×2160, 8-bit YCbCr 4:2:0) and features integrated equalization (up to 20 dB), pre-emphasis (up to 3.5 dB), I²C- or pin-strapped configuration, and TMDS power-down squelch mode with built-in clock detection. It is deployed on PC graphics driver boards to route HDMI/DP++ signals to dual displays such as monitors, projectors, and TVs.

For engineers reviewing the PI3HDX412BDZBEX datasheet, PI3HDX412BDZBEX pinout, PI3HDX412BDZBEX application, or PI3HDX412BDZBEX equivalent, key selection criteria include its 3.4 Gbps data rate support, dual-port TMDS output drive capability, configurable swing/slew/pre-emphasis via I²C or hardware pins, 56-pin TQFN package with 50 Ω source termination control, and industrial temperature operation (–40°C to +85°C).

Technical Context

This device implements a unidirectional active TMDS channel splitter architecture with two independent output ports (Port 1 and Port 2), each supporting full-rate differential signaling compliant with HDMI 1.4b and DVI standards. It integrates programmable input equalization (7 settings, 2.5–20 dB), output pre-emphasis (0–3.5 dB), voltage swing adjustment (±20%), and slew rate control - all configurable per port via I²C registers or hardware pins.

The IC uses a 3.3 V supply with internal 1.8 V LDO (VDD18) for core logic, supports AC/DC-coupled TMDS inputs, and provides Hi-Z outputs with selectable 50 Ω source termination (via ROUT_SEL). Its squelch mode detects absence of TMDS clock and disables outputs while enabling input termination, ensuring robust signal integrity in dynamic display hot-plug scenarios.

Key Specifications

Pinout & Package

PI3HDX412BDZBEX is housed in a 56-contact, 8 mm × 8 mm, 0.5 mm pitch Very Thin Quad Flat No-Lead (TQFN) package designated ZB56. The exposed thermal pad (ePad) enhances thermal dissipation and must be soldered to a solid GND plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI TMDS splitter applications.

Compared with PI3HDX612, PI3HDX412BDZBEX offers proven HDMI 1.4b compatibility and lower BOM cost but lacks HDCP and 6 Gbps capability; versus TPD12S016, it delivers active signal restoration essential for reliable 4K distribution over practical PCB and cable lengths.

Availability

PI3HDX412BDZBEX is available at Aetrix Electronics and suitable for PC graphics multi-display hubs, digital signage distribution amplifiers, and embedded video processing systems requiring stable component supply, industrial temperature operation, and HDMI 1.4b compliance.

Supply support for PI3HDX412BDZBEX 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 consumer, industrial, and automotive markets.

PI3HDX412BDZBEX belongs to Diodes' Pericom® high-speed interface product line, engineered specifically for HDMI/DVI signal distribution in bandwidth-constrained, noise-sensitive video systems where signal conditioning and configurability are critical.

FAQ

What is the maximum supported resolution and refresh rate for PI3HDX412BDZBEX?

The device supports up to 4096×2160 at 30 Hz (4K@30Hz) in 8-bit YCbCr 4:2:0 format, or 1920×1080 at 60 Hz (1080p@60Hz), based on its 3.4 Gbps per-channel TMDS data rate limit and HDMI 1.4b compliance. It does not support HDMI 2.0 resolutions like 4K@60Hz, which require ≥6 Gbps.

Can PI3HDX412BDZBEX operate with DC-coupled TMDS inputs?

Yes - the device accepts both AC- and DC-coupled differential TMDS inputs. Input termination resistors (Rt = 50 Ω) can be enabled/disabled via I²C register RX_SET[7] or pin-strapped control, and internal V-bias selection (to VDD or GND) is configurable to match the coupling scheme used in the host system.

How is output port selection implemented - hardware or software?

Port selection is implemented through dual modes: hardware (pin-strapped) using SEL1 and DR pins, or software (I²C) via CONFIG register bits[5:4]. When MS = LOW, SEL1 directly enables Port 1 (LOW) or Port 2 (HIGH); when MS = HIGH, I²C writes to CONFIG[5] and CONFIG[4] independently enable Port 1 and Port 2.

Does PI3HDX412BDZBEX support HDCP encryption?

No - PI3HDX412BDZBEX is a physical-layer TMDS signal conditioner and splitter only; it does not implement HDCP authentication or encryption. HDCP must be handled upstream (e.g., by the GPU or source SoC) or downstream (e.g., by the display), as the device transparently passes encrypted TMDS streams without modification.