Diodes Incorporated PI3DBS16222Q2ZLEX

Overview

PI3DBS16222Q2ZLEX from Diodes Incorporated is an AEC-Q100 Grade 2 automotive-qualified 4-channel 2×2 differential exchange switch supporting 20 Gbps data rates, operating at 3.3 V ±10%, with −30 dB crosstalk at 4 GHz and pass-through pinout for PCIe 4.0, USB 3.2 Gen 2, and Thunderbolt 4 signal routing in ADAS domain controllers.

For engineers reviewing the PI3DBS16222Q2ZLEX datasheet, PI3DBS16222Q2ZLEX pinout, PI3DBS16222Q2ZLEX application, or PI3DBS16222Q2ZLEX equivalent, key selection criteria include bidirectional 20 Gbps channel switching, AEC-Q100 Grade 2 temperature range (−40°C to 105°C), wettable-flank TQFN package compatibility, and differential skew ≤10 ps for high-speed serial link integrity.

Technical Context

The PI3DBS16222Q2ZLEX implements a single-pole double-throw (SPDT) exchange topology per differential pair, controlled by a single SEL input that toggles between two fixed routing states: (A↔B, C↔D) and (A↔D, B↔C). It operates without internal termination or equalization, relying on external AC coupling and host-side signal conditioning.

Its architecture supports true bidirectional operation across all eight differential lanes (four 2×2 channels), with DC-coupled control logic, 3.3 V CMOS-compatible SEL input, and no internal biasing-requiring external 50 Ω source/load termination for specified insertion loss and crosstalk performance up to 10 GHz.

Key Specifications

Pinout & Package

ZL30 TQFN (30-contact, Thin Fine Pitch Quad Flat No-Lead), 2.5 mm × 4.5 mm body, 0.4 mm pitch, wettable flank terminations, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential exchange switch applications.

Compared with TS3DV642AIPR and MAX4929EATA+, the PI3DBS16222Q2ZLEX uniquely delivers 20 Gbps operation within AEC-Q100 Grade 2 constraints and wettable-flank manufacturability-making it the only drop-in option for automotive PCIe 4.0 lane aggregation without derating or redesign.

Availability

PI3DBS16222Q2ZLEX is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, PCIe 4.0 SSD expansion modules, and Thunderbolt 4 port replicators requiring stable component supply across extended product lifecycles.

Supply support for PI3DBS16222Q2ZLEX 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 automotive-qualified components.

The PI3DBS series targets high-speed serial interface routing in automotive and industrial systems, designed specifically to replace retimers and complex switches in PCIe, USB, and Thunderbolt signal paths while meeting AEC-Q100 reliability requirements.

FAQ

Does PI3DBS16222Q2ZLEX require external termination resistors?

Yes. The device is impedance-agnostic and requires 50 Ω source and load termination on all differential lanes to meet specified insertion loss, return loss, and crosstalk performance. No internal termination is provided; external 50 Ω resistors must be placed within 3 mm of each I/O pin per layout guidelines in the datasheet Rev 2.

Can PI3DBS16222Q2ZLEX operate at 1.8 V logic levels on the SEL pin?

No. SEL is strictly 3.3 V CMOS-compatible with VIH(min) = 2.0 V and VIL(max) = 0.8 V. Driving SEL from 1.8 V logic violates input threshold margins and may cause metastability or undefined switching behavior; level-shifting is required for mixed-voltage systems.

Is the thermal pad on ZL30 package electrically connected internally?

No. The exposed thermal pad on the ZL30 TQFN package is not internally connected to any die node. It must be soldered to a dedicated PCB thermal plane for heat dissipation but should remain electrically isolated from VDD, GND, or signal nets per Diodes' recommended footprint.

What is the maximum allowable PD pin rise time for reliable power-down activation?

The PD pin has no specified rise/fall time limit, but Diodes recommends keeping edge rates below 10 V/µs to avoid triggering internal latch-up. A 10 kΩ pull-down resistor with 100 pF capacitor yields ~1 µs RC time constant, ensuring clean transition and avoiding false power-down during hot-swap events.