Diodes Incorporated PI3B3384QEX

Overview

PI3B3384QEX from Diodes Incorporated (acquired Pericom Semiconductor) is a 3.3 V, 10-bit, dual-port bus switch with independent bus enable controls (BEA/BEB), 5 Ω typical on-resistance, near-zero propagation delay, and ultra-low quiescent current (0.1 μA). It functions as a bidirectional signal path selector in high-speed digital interconnects, enabling dynamic routing of parallel data buses in notebook, telecom backplane, and FPGA I/O expansion applications.

For engineers reviewing the PI3B3384QEX datasheet, PI3B3384QEX pinout, PI3B3384QEX application, or PI3B3384QEX equivalent, key selection criteria include its dual 5-bit enable architecture, 4.5 ns max switching speed, 3.0 pF input capacitance, rail-to-rail logic compatibility up to +3.6 V, and QSOP-24 Pb-free/Green packaging.

Technical Context

The PI3B3384QEX implements two independent 5-bit switch banks (A0–A4/B0–B4 and A5–A9/B5–B9), each controlled by a dedicated active-low bus enable (BEA or BEB). Its CMOS transmission-gate topology ensures bidirectional signal flow without directionality constraints or level-shifting requirements.

It operates within –40°C to +85°C ambient, supports supply voltage from 3.0 V to 3.6 V, and features integrated clamp diodes (VIK = –1.2 V) for ESD protection. The device draws only 0.1 μA quiescent current when disabled and exhibits no added propagation delay beyond RC time constant (<0.25 ns for 50 pF load).

Key Specifications

Pinout & Package

PI3B3384QEX is housed in a 24-pin QSOP (150-mil wide) package with 0.635 mm pitch, RoHS-compliant and Pb-free/Green (E suffix) construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384CPWR and PI3CH480QEX, PI3B3384QEX uniquely delivers 10-bit width with independent 5-bit enables, making it optimal for applications requiring granular, low-latency bus partitioning without voltage translation or footprint compromise.

Availability

PI3B3384QEX is available at Aetrix Electronics and suitable for high-speed notebook I/O expansion, FPGA mezzanine multiplexing, and telecom backplane signal gating requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for PI3B3384QEX 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 acquired Pericom Semiconductor in 2017, integrating its high-speed interface and signal-integrity portfolio into a broad analog and mixed-signal solutions provider serving computing, communications, and industrial markets.

PI3B3384QEX belongs to Pericom's NanoSwitch™ family - engineered specifically for low-latency, low-power, bidirectional bus switching in space- and power-constrained digital systems where signal fidelity and enable granularity are critical.

FAQ

Can PI3B3384QEX operate with 2.5 V logic control signals?

Yes. The device accepts logic inputs from –0.5 V to +3.6 V regardless of VCC, so 2.5 V control signals fully meet VIH (≥2.0 V) and VIL (≤0.8 V) thresholds. No level shifter is required, simplifying mixed-voltage board design and reducing BOM cost.

What is the maximum capacitive load this switch can drive without signal degradation?

With 5 Ω RON and 16.0 pF CON (switch-on capacitance), the PI3B3384QEX maintains clean edges up to ~50 pF total load capacitance. At that load, RC time constant remains <0.25 ns - well below typical 1–2 ns rise times of 3.3 V CMOS drivers, preserving signal integrity in most PCB interconnect scenarios.

Does PI3B3384QEX require power-supply sequencing?

Yes. VCC and GND must be applied before any input or output signals to prevent latch-up or damage. This is specified in the Absolute Maximum Ratings table: applying signals prior to VCC risks exceeding –0.5 V to +4.6 V limits on pins, potentially causing irreversible junction breakdown.

Is the QSOP-24 package thermally adequate for continuous 120 mA per pin operation?

Yes. With 0.5 W maximum power dissipation and typical RON of 5 Ω, worst-case power per switch (at 120 mA) is 72 mW. The QSOP-24 package's thermal resistance (θJA ≈ 120°C/W) results in <9°C junction rise above ambient - well within the –40°C to +85°C operating range and safe for continuous operation.