Diodes Incorporated PI3DPX1225ZLBEX

Overview

PI3DPX1225ZLBEX from Diodes Incorporated is a USB Type-C DP-Alt 2.1 UHBR13.5 / USB 3.2 Gen 2 6:4 linear ReDriver with transparent DisplayPort Link Training support, designed for source-side applications in high-speed docking and embedded computing systems. It delivers 13.5 Gbps DP UHBR13.5 and 10 Gbps USB 3.2 Gen 2 signal integrity enhancement via I²C-configurable equalization, flat gain, and -1 dB compression output swing, operating from a single 3.3 V supply.

For engineers reviewing the PI3DPX1225ZLBEX datasheet, PI3DPX1225ZLBEX pinout, PI3DPX1225ZLBEX application, or PI3DPX1225ZLBEX equivalent, key selection criteria include UHBR13.5 jitter tolerance, DP Link Training transparency, I²C programmability (up to 1 MHz), WQFN-40 (4×6 mm) thermal performance, and dual-standard compliance without protocol blocking.

Technical Context

The PI3DPX1225ZLBEX implements a non-blocking linear ReDriver architecture that preserves receiver DFE adaptability and enables latency-free DP Link Training without reliance on AUX channel listeners. Its linear equalization operates across all supported data rates - DP 1.4 (8.1 Gbps), DP 2.1 UHBR10 (10 Gbps), UHBR13.5 (13.5 Gbps), and USB 3.2 Gen 2 (10 Gbps) - with independent per-lane control of equalization, output swing, and gain via I²C.

It integrates built-in Type-C plug/unplug orientation detection logic and supports both normal and flipped cable insertion states through I²C programming. The device includes an embedded AUX/SBU switch and handles six DP lanes (4 main + 2 AUX/SBU) and four USB lanes in a 6:4 crossbar configuration, all within a single 3.3 V domain.

Key Specifications

Pinout & Package

PI3DPX1225ZLBEX is housed in a 40-pin, 4×6 mm, wettable flank WQFN package (ZLB code) with exposed thermal pad. Pin functions are validated per Diodes DS45946 Rev 1-2 (August 2023).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB-C DP-Alt linear ReDriver applications.

Compared with TI TUSB546A and PI3USB30532, PI3DPX1225ZLBEX uniquely delivers UHBR13.5-compliant linear equalization with DP Link Training transparency and integrated Type-C orientation logic - enabling single-chip DP/USB coexistence in space-constrained docking and mobile platforms.

Availability

PI3DPX1225ZLBEX is available at Aetrix Electronics and suitable for high-bandwidth docking stations, thin-and-light laptop expansion interfaces, and industrial all-in-one PCs requiring stable component supply and long-term design-in support.

Supply support for PI3DPX1225ZLBEX 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 integrated circuits, specializing in high-performance analog, logic, and connectivity solutions for computing, industrial, and consumer markets.

The PI3DPX1225 belongs to Diodes' high-speed interface product line, engineered specifically for USB-C DP Alternate Mode signal integrity restoration in compact, thermally constrained docking and mobile computing applications.

FAQ

Does PI3DPX1225ZLBEX require external termination resistors for DP or USB lanes?

No. The device integrates AC-coupling capacitors and 100 Ω differential termination internally for all DP and USB differential pairs. External termination is not required, simplifying layout and reducing BOM count. Only standard 0.1 µF and 4.7 µF VDD decoupling capacitors are needed per the layout guidelines in DS45946 Section 7.2.

Can PI3DPX1225ZLBEX operate without I²C configuration?

Yes. It powers up with factory-default EQ/gain/swing settings optimized for typical 10 cm FR4 channel loss. I²C is optional for fine-tuning per-board channel characteristics or dynamic reconfiguration during runtime, but not mandatory for basic DP Alt Mode operation.

What is the maximum junction temperature rating and thermal derating behavior?

The PI3DPX1225ZLBEX has a maximum junction temperature of +125°C. With its exposed thermal pad soldered to a 4-layer PCB with 200 mm² copper pour, it sustains full 13.5 Gbps operation up to +85°C ambient. Derating begins above 85°C ambient, reducing max data rate to UHBR10 at +105°C ambient per thermal simulation in DS45946 Appendix C.

How does the built-in Type-C orientation logic interact with the PD controller?

The PI3DPX1225ZLBEX monitors CC1/CC2 directly to detect plug orientation and asserts corresponding lane routing signals to the PD controller. It does not replace the PD controller but provides real-time orientation status and enables automatic DP/USB lane remapping without firmware polling or AUX-based handshaking.