Diodes Incorporated PI3TB212ZLEX

Overview

PI3TB212ZLEX from Pericom Semiconductor is a high-speed 24-pin TQFN multiplexer/demultiplexer switch supporting 10.3125 Gbps Thunderbolt™ and 5.4 Gbps DisplayPort™ signal routing. It integrates dual-path switching (Thunderbolt Rx and DP main link), AUX/DDC MUX, HPD buffering, and cable detection for mini-DP connector enablement in hybrid interface systems.

For engineers reviewing the PI3TB212ZLEX datasheet, PI3TB212ZLEX pinout, PI3TB212ZLEX application, or PI3TB212ZLEX equivalent, key selection criteria include differential path insertion loss at 4–8 GHz, off-isolation >15 dB up to 8 GHz, 3.3 V ±10% supply operation, integrated pull-up/pull-down networks on AUX/LSRx paths, and support for Thunderbolt 10G_EN/DP_EN# control logic sequencing.

Technical Context

The PI3TB212ZLEX implements a configurable 2:1/3:1 analog switch matrix with independent control of Thunderbolt Rx, DP main link (ML1), AUX, DDC, HPD, and UART LSTx/LSRx paths via S0, 10G_EN, and DP_EN# inputs. Its architecture supports simultaneous buffer enablement for CA_DET_Out, HPD_Out, and LSRx while maintaining <5 ps bit-to-bit skew across differential pairs.

It operates across three primary modes-Thunderbolt (10.3125 Gbps), DisplayPort (5.4 Gbps), and TMDS-with dynamic reconfiguration enabled by external logic. The device features integrated 88 kΩ pull-up on AUX−, 1 MΩ pull-down on LSRx, and 9 kΩ pull-up on HPD_SINK, eliminating discrete biasing components in mini-DP dongle designs.

Key Specifications

Pinout & Package

PI3TB212ZLEX uses a 3.0 mm × 3.0 mm, 24-contact Very Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad. Pin numbering follows top-view orientation with GND on pins 9, 21, and center pad (all must be connected to ground plane).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed interface multiplexer applications.

Compared with PI3DBS16412ZLE and TS3USB30E, PI3TB212ZLEX uniquely integrates Thunderbolt/DP dual-path switching, AUX/DDC MUX, HPD buffering, and mini-DP pin-optimized I/O in a single 3×3 mm package-making it the only solution that eliminates external switches and biasing in certified Thunderbolt-enabled mini-DP adapters.

Availability

PI3TB212ZLEX is available at Aetrix Electronics and suitable for mini-DP to USB-C adapters, Thunderbolt docking stations, and DP++ active dongles requiring stable component supply and guaranteed long-term availability.

Supply support for PI3TB212ZLEX 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-speed interface ICs for computing, communications, and consumer electronics before integration into Diodes' signal integrity portfolio.

The PI3TB212 belongs to Pericom's Thunderbolt/DisplayPort switch product line, designed specifically to simplify hybrid interface implementation in compact docking solutions and active cables by integrating protocol-aware signal routing, buffering, and biasing functions.

FAQ

What is the maximum supported data rate for Thunderbolt and DisplayPort paths?

The PI3TB212ZLEX supports 10.3125 Gbps on the Thunderbolt Rx path (pins 7–8 to 22–23) and 5.4 Gbps on the DisplayPort main link path (pins 10–11 to 19–20). Measured insertion loss remains ≤–1.5 dB at 5 GHz for Thunderbolt and ≤–1.1 dB at 2.7 GHz for DP, confirming compliance with Thunderbolt 1/2 and DP 1.2 specifications.

How does the device handle hot-plug detection and cable presence sensing?

PI3TB212ZLEX provides buffered HPD_Out (pin 12) driven from TBC-2 (mini-DP pin 2) and CA_DET_Out (pin 16) driven from TBC-4 (mini-DP pin 4). Both outputs meet standard DP sink-side voltage thresholds (VOH ≥ 2.4 V, VOL ≤ 0.8 V at 2 mA), enabling direct connection to host controller GPIOs without level-shifting.

Can the PI3TB212ZLEX operate with supply voltages below 3.3 V?

Normal operation requires VDD = 3.3 V ±10% (3.0–3.6 V). While extended operation down to 2.5 V is noted for LSTx/LSRx to TBC-9/TBC-11 channels, performance-including insertion loss, off-isolation, and switching time-is not guaranteed below 3.0 V, and DC characteristics (e.g., VIH/VIL) are only specified across the 3.0–3.6 V range.

What are the thermal and packaging specifications for this device?

PI3TB212ZLEX uses a Pb-free, green 24-contact TQFN package measuring 3.0 mm × 3.0 mm × 0.55 mm with an exposed thermal pad. Operating case temperature is rated from 0°C to +105°C. Thermal resistance (θ_JA) is documented in Pericom's PD-2109 package bulletin, and the center pad must be soldered to a solid ground plane for thermal and electrical integrity.