Diodes Incorporated PI3B3244LE

Overview

PI3B3244LE from Diodes Incorporated is a 3.3V, 20-pin TSSOP 8-bit dual-port bus switch with two independent active-low enable inputs (BE1, BE2), 5Ω on-resistance, 4.5ns max switching time, and ultra-low quiescent current (0.2μA typical), used for hot-insertion-capable data path isolation in notebook and server backplane applications.

For engineers reviewing the PI3B3244LE datasheet, PI3B3244LE pinout, PI3B3244LE application, or PI3B3244LE equivalent, key selection criteria include bus-switch on-resistance matching, enable timing symmetry, hot-plug rail-to-rail input tolerance, and Pb-free TSSOP-20 thermal profile compatibility.

Technical Context

The PI3B3244LE implements two independent 4-bit bidirectional bus switches (Port A: A0–A3 ↔ B0–B3; Port B: A4–A7 ↔ B4–B7), each controlled by one of two active-low enable signals (BE1, BE2). Switch conduction is resistive (no CMOS output stage), eliminating propagation delay beyond RC time constant.

It supports rail-to-rail logic inputs up to +3.6V regardless of VCC = 3.3V ±10%, enabling interoperability with mixed-voltage systems. No ground bounce or signal integrity degradation occurs during switching due to zero-output-drive architecture.

Key Specifications

Pinout & Package

Package: 20-pin, 173-mil wide lead-free green TSSOP (L), JEDEC MO-153 compliant, 0.65mm pitch, 7.9mm × 4.5mm body size, suitable for high-density PCB layouts and reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI3CH3244LE, the PI3B3244LE offers proven legacy stability but lacks extended temperature and ESD headroom; versus SN74CBT3244CPWR, it provides guaranteed pinout compatibility and tighter disable timing, critical for deterministic hot-swap sequencing.

Availability

PI3B3244LE is available at Aetrix Electronics and suitable for notebook memory expansion slots, server backplane hot-swap modules, and industrial PLC I/O carrier boards requiring stable component supply and long-lifecycle support.

Supply support for PI3B3244LE 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 analog, logic, and power management solutions for computing, industrial, and communications markets.

The PI3B series was designed specifically for low-latency, low-noise bus isolation in portable and hot-pluggable systems, emphasizing rail-to-rail compatibility, near-zero delay, and ultra-low static power consumption.

FAQ

What is the maximum allowable input voltage on BE1/BE2 when VCC = 3.3V?

The absolute maximum input voltage on BE1 and BE2 is +4.6V, and the device supports rail-to-rail logic inputs up to +3.6V regardless of VCC level. This allows direct interfacing with 5V-tolerant microcontrollers or FPGA I/O banks without external level shifters, provided the input does not exceed the –0.5V to +4.6V absolute rating range.

Does PI3B3244LE introduce propagation delay between A and B ports?

No - the PI3B3244LE adds no active propagation delay. Signal transit is governed solely by the RC time constant of its 5Ω on-resistance and load capacitance (e.g., ~0.25ns for 50pF). This passive behavior preserves edge rates and avoids timing skew, unlike buffered drivers that insert fixed gate delays.

Can PI3B3244LE be used in 5V systems?

No - PI3B3244LE is strictly a 3.3V-only device. Its VCC rating is 3.3V ±10% (2.97–3.63V), and operation outside this range violates Absolute Maximum Ratings. While inputs tolerate up to +4.6V, sustained 5V VCC will cause permanent damage. For 5V systems, consider the PI3B3245 or SN74CBT3245 families.

Is PI3B3244LE pin-compatible with PI3CH3244LE?

Yes - PI3CH3244LE is a direct functional and pin-for-pin replacement for PI3B3244LE, sharing identical TSSOP-20 pinout, enable logic, and switching behavior. It upgrades RON, ESD rating, and temperature range but requires no PCB or firmware changes for migration.