Diodes Incorporated PI3DBS16212XUAEX

Overview

PI3DBS16212XUAEX from Diodes Incorporated is a 2-channel, 2:1 differential multiplexer/demultiplexer switch optimized for USB3.1 Gen 2 (10 Gbps), Thunderbolt 3 (20 Gbps), SAS3.0 (12 Gbps), and PCIe 4.0 (16 GT/s) signal routing. It supports bidirectional operation at 3.3 V supply, delivers -1.3 dB insertion loss at 5 GHz and 8 GHz, and maintains 10 ps typical channel-to-channel skew in its 18-pin X2QFN (2 mm × 2 mm) package.

For engineers reviewing the PI3DBS16212XUAEX datasheet, PI3DBS16212XUAEX pinout, PI3DBS16212XUAEX application, or PI3DBS16212XUAEX equivalent, key selection criteria include verified 20 Gbps data rate support, sub-10 ps channel skew, differential impedance matching for USB3.1/Thunderbolt 3 layout integration, and low-power 300 µA quiescent current in a space-constrained 2×2 mm footprint.

Technical Context

The PI3DBS16212XUAEX implements a single-pole double-throw (SPDT) architecture per differential lane, with two independent 2:1 Mux/DeMux channels controlled by a single SEL pin. Its design targets high-speed serial protocols requiring minimal signal degradation: 13 GHz 3-dB bandwidth, -21 dB return loss at 5 GHz, and <3 ps bit-to-bit skew ensure compliance with USB3.1 Gen 2 and Thunderbolt 3 eye diagram requirements.

It operates exclusively at 3.3 V ±10%, draws only 300 µA typical supply current, and functions across -40°C to +85°C. The device uses no internal termination resistors-external AC coupling and reference plane continuity are required per high-speed layout guidelines for SAS3.0 and PCIe 4.0 channel integrity.

Key Specifications

Pinout & Package

PI3DBS16212XUAEX is housed in an 18-contact, 2 mm × 2 mm, 0.4 mm pitch X2QFN (XUA) package with exposed thermal pad. Pin numbering follows JEDEC MO-220 variation, with pins arranged in two rows (9 per side), and ground-signal-ground pinout symmetry to suppress crosstalk.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS3USB30EVMRTER and MAX4989ETE+T, PI3DBS16212XUAEX uniquely supports 20 Gbps operation with 10 ps channel skew and 13 GHz bandwidth-enabling single-chip solutions for Thunderbolt 3, USB3.1 Gen 2, and SAS3.0 without signal regeneration.

Availability

PI3DBS16212XUAEX is available at Aetrix Electronics and suitable for USB-C docking stations, Thunderbolt 3 add-in cards, and enterprise SAS3.0 SSD controllers requiring stable component supply and validated high-speed signal integrity.

Supply support for PI3DBS16212XUAEX 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 Europe.

The PI3DBS16212XUAEX belongs to Diodes' Pericom high-speed signal-switching product line, engineered specifically for USB, Thunderbolt, SAS, and PCIe interface consolidation in compact, thermally constrained systems.

FAQ

Does PI3DBS16212XUAEX require external termination resistors?

No. The device is designed for use with externally terminated differential transmission lines (typically 100 Ω). It does not integrate on-die termination and relies on proper PCB layout-including controlled impedance traces, AC coupling capacitors, and reference plane continuity-to meet USB3.1 Gen 2 and Thunderbolt 3 compliance requirements.

Can PI3DBS16212XUAEX operate at 1.8 V supply?

No. PI3DBS16212XUAEX is specified only for 3.3 V ±10% operation. Attempting 1.8 V supply will result in undefined logic states on SEL and PD pins, failure to pass 20 Gbps signals, and potential damage due to improper gate biasing in the internal FET array.

Is the XUA package pin-compatible with the ZBB package version?

No. PI3DBS16212XUAEX (18-pin X2QFN, 2×2 mm) and PI3DBS16212ZBBEX (20-pin TQFN, 2.5×4.5 mm) have different pin counts, layouts, and thermal pad configurations. They are functionally identical but require separate PCB footprints and layout validation.

What is the maximum recommended trace length when using PI3DBS16212XUAEX at 20 Gbps?

With -1.3 dB insertion loss at 5–8 GHz and 13 GHz bandwidth, the device supports ≤6 inches of well-designed FR4 microstrip (100 Ω differential, 4-mil dielectric) before equalization is required. For >6 inch runs, use low-loss laminates (e.g., Megtron 6) and validate via S-parameter simulation against USB3.1 Gen 2 eye mask.