Diodes Incorporated PI3B3245QE

Overview

PI3B3245QE from Diodes Incorporated is a 3.3V, 8-bit, 2-port bus switch with hot-insertion capability, 5Ω on-resistance, 4.5ns max switching speed, and ultra-low quiescent current (0.2μA typical), used to connect or isolate parallel data buses in notebook and portable computing systems.

For engineers reviewing the PI3B3245QE datasheet, PI3B3245QE pinout, PI3B3245QE application, or PI3B3245QE equivalent, key selection criteria include bus enable polarity (active-low), rail-to-rail input compatibility, near-zero propagation delay contribution, and QSOP-20 packaging for high-density PCB layouts.

Technical Context

The PI3B3245QE implements an array of eight independent bilateral analog switches controlled by a single active-low Bus Enable (BE) signal, enabling simultaneous connection or high-impedance isolation between two 8-bit parallel buses (A0–A7 and B0–B7). It operates without adding measurable propagation delay beyond RC time constant (<0.25ns for 50pF load).

Designed for hot-plug environments, it supports rail-to-rail logic inputs up to +3.6V independent of VCC, features ESD protection (2kV HBM, 200V MM), and maintains TTL-compatible control thresholds (VIH = 2.0V min, VIL = 0.8V max) at 3.3V supply.

Key Specifications

Pinout & Package

PI3B3245QE is packaged in a 20-pin QSOP (Q) with 150mil body width and standard 0.65mm lead pitch. The package includes exposed thermal pad in W-QFN variant; QSOP uses conventional gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bus switch applications.

Compared with SN74CBT3245APW and 74LVC245ADTR, PI3B3245QE delivers lower on-resistance, true bidirectional zero-delay switching, and superior hot-plug reliability-making it optimal for space-constrained, battery-sensitive, and live-reconfiguration applications.

Availability

PI3B3245QE is available at Aetrix Electronics and suitable for notebook memory expansion interfaces, PCIe mini-card isolation, embedded debug port multiplexing, and industrial I/O module signal routing requiring stable component supply and long-term lifecycle assurance.

Supply support for PI3B3245QE 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, hot-pluggable interconnects in portable and modular electronic systems.

FAQ

What is the function of the BE pin on PI3B3245QE?

The BE (Bus Enable) pin is an active-low control input that globally enables or disables all eight bilateral switches. When BE is logic LOW, A0–A7 are connected to B0–B7; when BE is HIGH, all ports enter high-impedance state. It has TTL-compatible thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and supports rail-to-rail input voltage up to +3.6V independent of VCC.

Can PI3B3245QE operate with 5V logic signals?

Yes - its logic inputs tolerate voltages from –0.5V to +4.6V regardless of VCC, allowing direct interface with 5V-tolerant drivers even when powered at 3.3V. However, output swing is limited to VCC rails, so driving 5V loads requires external level-shifting; the device itself does not translate voltage levels.

Is PI3B3245QE suitable for hot-swap applications?

Yes - it is explicitly designed for hot insertion with fast enable/disable times (tPZH/tPLZ ≤ 4.5ns), near-zero propagation delay, and controlled turn-on characteristics that prevent bus contention and ground bounce. Its 2kV HBM ESD rating further enhances robustness during live connector mating.

What package variants are available for PI3B3245QE?

PI3B3245QE is offered exclusively in the 20-pin QSOP (Q) package with 150mil width and standard gull-wing leads. Other variants include PI3B3245LEX (TSSOP-20) and PI3B3245ZHEX (W-QFN-20), but the "QE" suffix denotes the QSOP version with Pb-free/Green compliance and tape-and-reel packaging.