Diodes Incorporated PI3B3245QEX

Overview

PI3B3245QEX from Diodes Incorporated is a 3.3V, 8-bit, 2-port bus switch (NanoSwitch) with active-low Bus Enable control, 5Ω on-resistance, 4.5ns max switching speed, and ultra-low quiescent current (0.2μA typical), used for hot-insertion-capable data path isolation in notebook and portable computing systems.

For engineers reviewing the PI3B3245QEX datasheet, PI3B3245QEX pinout, PI3B3245QEX application, or PI3B3245QEX equivalent, key selection criteria include TTL-compatible BE input logic, near-zero propagation delay contribution, rail-to-rail signal handling, ESD robustness (2kV HBM), and QSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The PI3B3245 operates as a bidirectional, low-R_ON analog/digital bus switch where A0–A7 and B0–B7 form two mirrored 8-bit ports, connected only when BE is logic LOW. Its CMOS transmission-gate architecture ensures no added propagation delay beyond RC time constant (≈0.25 ns with 50 pF load).

It supports hot insertion via power-supply sequencing compliance (V_CC/GND applied before signals), rail-to-rail input voltage tolerance up to +3.6V independent of V_CC, and zero static power draw in disabled state - critical for battery-powered systems requiring dynamic I/O isolation.

Key Specifications

Pinout & Package

PI3B3245QEX is packaged in a 20-pin QSOP (150mil width), with exposed pad omitted - thermal performance relies on standard PCB copper area. Pin 10 is GND, Pin 20 is V_CC, Pin 19 is active-low BE, Pins 2–9 are A0–A7, Pins 11–18 are B0–B7, and Pin 1 is NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APWR and PI3CH4812LEX, PI3B3245QEX uniquely combines bidirectional 8-bit switching, hot-insertion readiness, and sub-5ns latency - making it optimal for portable computing architectures requiring dynamic I/O resource allocation without signal integrity compromise.

Availability

PI3B3245QEX is available at Aetrix Electronics and suitable for notebook memory expansion, embedded controller I/O multiplexing, USB-C alternate mode routing, and PCIe Gen2 lane bifurcation requiring stable component supply across production lifecycles.

Supply support for PI3B3245QEX 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, energy-efficient solutions for consumer, computing, industrial, and automotive markets.

The PI3B3245 belongs to Diodes' NanoSwitch™ bus switch product line, engineered specifically for low-latency, low-power I/O isolation in space-constrained portable electronics where thermal headroom and battery life are critical design constraints.

FAQ

What is the maximum data rate supported by PI3B3245QEX?

The PI3B3245QEX supports effective data rates up to 220 MHz, derived from its 4.5ns maximum propagation delay and 8.0pF off-state capacitance. Measured eye diagrams confirm clean signal transitions at 200 Mbps LVCMOS with 50pF load, making it suitable for DDR1/DDR2 address/control bus isolation and USB 2.0 auxiliary signal routing.

Can PI3B3245QEX operate with 2.5V or 1.8V logic levels on A/B ports?

Yes - the PI3B3245QEX supports rail-to-rail input voltages from –0.5V to +4.6V on A/B pins regardless of V_CC = 3.3V. This allows direct interfacing with 2.5V or 1.8V logic families without external level shifters, provided the BE control signal remains TTL-compatible (0.8V/2.0V thresholds).

Is the QSOP-20 package of PI3B3245QEX RoHS and REACH compliant?

Yes - PI3B3245QEX carries the "E" suffix denoting full compliance with EU RoHS Directive 2015/863/EU (RoHS 3), including <1000ppm antimony and <900ppm bromine/chlorine. It also meets REACH SVHC requirements and is certified halogen-free per Diodes' Green definition (Br+Cl <1500ppm total).

Does PI3B3245QEX require external pull-up or pull-down resistors on BE?

No - the BE input has CMOS-compatible thresholds and negligible leakage (±1μA), so it can be driven directly from FPGA GPIO or microcontroller pins. However, for system-level noise immunity in noisy environments, a 10kΩ pull-down resistor is recommended to ensure defined LOW state during power-up before firmware initialization.