Diodes Incorporated PI3B32X245BE

Overview

PI3B32X245BE from Diodes Incorporated is a 3.3V, 16-bit, 2-port bus switch with dual active-low enable inputs (BE1, BE2), 5Ω typical on-resistance, 4.5ns max bus disable time, and industrial temperature range (–40°C to +85°C). It enables hot insertion in notebook and server backplane interconnects by providing near-zero propagation delay and direct A/B bus connection when enabled.

For engineers reviewing the PI3B32X245BE datasheet, PI3B32X245BE pinout, PI3B32X245BE application, or PI3B32X245BE equivalent, key selection criteria include bidirectional 16-bit switching capability, TTL-compatible control logic, ultra-low quiescent current (1.0µA typ), and BQSOP-40 packaging for high-density PCB layouts.

Technical Context

The PI3B32X245BE implements a passive FET-based analog bus switch architecture-no internal logic or level translation-ensuring signal integrity across A0–A15 and B0–B15 ports. Its dual independent enable inputs (BE1, BE2) allow selective activation of two 16-bit switch banks without crosstalk.

Switching is governed solely by voltage-controlled MOSFET conduction: when BEx = LOW, the corresponding A/B pair connects with R_ON ≤ 8Ω (max), and when BEx = HIGH, output impedance exceeds 10⁹Ω. Propagation delay is dominated by RC time constant (RON × C_LOAD), not internal logic.

Key Specifications

Pinout & Package

Package: 40-pin, 150-mil wide plastic BQSOP (Pb-free & Green compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus switch applications.

Compared with SN74CBT16245DGGR and PI3CH485LE, the PI3B32X245BE uniquely delivers dual independent enables in a single 40-pin BQSOP, enabling true 16-bit hot-swap isolation without external glue logic or device stacking-critical for compact, high-reliability backplane designs.

Availability

PI3B32X245BE is available at Aetrix Electronics and suitable for server backplane interconnect, notebook memory expansion, and industrial PLC I/O expansion requiring stable component supply across extended product lifecycles.

Supply support for PI3B32X245BE 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, high-reliability components for power management, signal integrity, and protection applications.

The PI3B32X245BE belongs to Diodes' Pericom bus switch product line, engineered specifically for low-latency, hot-pluggable interconnect in computing and industrial systems where signal fidelity and enable control granularity are critical.

FAQ

What is the maximum allowable capacitive load for reliable PI3B32X245BE switching at 100MHz?

The PI3B32X245BE maintains signal integrity up to 100MHz with ≤50pF total load capacitance, as confirmed by its 16.0pF typical C_ON and 0.25ns RC time constant (5Ω × 50pF). Exceeding 50pF increases rise/fall time degradation and may violate setup/hold margins in synchronous interfaces.

Can PI3B32X245BE be used with 2.5V or 1.8V I/O systems?

No-the PI3B32X245BE is strictly a 3.3V-only device: VCC must be 3.3V ±10%, and input logic thresholds (VIH = 2.0V, VIL = 0.8V) are optimized for 3.3V TTL. Using it with 2.5V or 1.8V signals risks undefined switching behavior and violates absolute maximum ratings for input voltage.

How does the dual-enable architecture prevent bus contention during hot insertion?

BE1 and BE2 independently control two 16-bit switch banks. During hot insertion, one bank remains disabled (Hi-Z) while the other is sequenced-ensuring no path exists between pre-powered and inserting bus segments until power/ground stabilization is confirmed, eliminating shoot-through current and data corruption.

Is PI3B32X245BE pin-compatible with earlier PI3B32X245 variants?

Yes-PI3B32X245BE shares identical pinout, electrical specifications, and BQSOP-40 package with all PI3B32X245 family members (e.g., PI3B32X245BEX, PI3B32X245BLE). The "E" suffix denotes Pb-free/Green compliance; no functional or mechanical differences exist between variants.