Diodes Incorporated PI3CH281QE

Overview

PI3CH281QE from Diodes Incorporated is a 2-channel, 4:1 analog multiplexer/demultiplexer with 3-state outputs, designed for high-bandwidth signal routing in hot-plug-capable systems. It operates at 1.8V/2.5V/3.3V supply voltages, delivers 300 MHz –3dB bandwidth, features 5 Ω typical on-resistance, and supports rail-to-rail input switching up to 5 V with 3.3 V supply - deployed in PCIe switch fabric and server backplane signal management.

For engineers reviewing the PI3CH281QE datasheet, PI3CH281QE pinout, PI3CH281QE application, or PI3CH281QE equivalent, key selection criteria include enable-low logic polarity, sub-0.3 ns propagation delay contribution, 8 kV HBM ESD rating, and compatibility with 1.8 V–3.3 V logic families in high-speed I/O switching contexts.

Technical Context

The PI3CH281QE implements dual independent 4:1 bidirectional analog switches controlled by two select lines (S1/S0) and a common active-low enable (EN). Each channel routes one of four inputs (IA0–IA3 or IB0–IB3) to its respective output (YA or YB), with true 3-state disable capability when EN is high.

Its architecture enables beyond-rail switching (0–5 V with 3.3 V VCC), exhibits near-zero added propagation delay (<0.3 ns typical), and maintains low crosstalk (–60 dB) and off-isolation (–60 dB) across 300 MHz bandwidth - critical for preserving signal integrity in multi-gigabit serial interconnects.

Key Specifications

Pinout & Package

Package: 16-pin, 150-mil wide QSOP (Q), RoHS-compliant, Pb-free and green.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with TS3A4751PWR and ADG732BRUZ, the PI3CH281QE uniquely combines dual 4:1 routing, 300 MHz bandwidth, 5 V input tolerance at 3.3 V supply, and hot-plug robustness - making it optimal for PCIe, backplane, and test instrumentation where signal integrity and live-reconfiguration are mandatory.

Availability

PI3CH281QE is available at Aetrix Electronics and suitable for PCIe switch fabric, server backplane signal routing, and high-speed test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PI3CH281QE 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 industrial, computing, and communications markets.

The PI3CH281QE belongs to Diodes' Pericom® high-speed analog switch product line, engineered specifically for low-skew, high-bandwidth signal routing in hot-plug-capable infrastructure equipment.

FAQ

Is PI3CH281QE compatible with 5 V logic inputs when powered from 3.3 V?

Yes. The device supports 0–5 V input voltage swing with 3.3 V supply, enabling direct interfacing with 5 V peripherals without external level shifters. This is achieved via beyond-rail switching architecture and 5 V I/O tolerance in both ON and OFF states, verified per DS40893 Rev 1-2 Section "Beyond Rail-to-Rail Switching".

What is the maximum allowable hot-insertion transient voltage and duration?

The PI3CH281QE withstands up to 6 V transient input voltage for durations ≤20 ns during hot insertion, as specified in the Absolute Maximum Ratings table. Exceeding either limit risks permanent damage; sustained transients require external clamping per Application Note AN-1001 on hot-swap design.

Does PI3CH281QE introduce measurable propagation delay in high-speed data paths?

No - the switch contributes <0.3 ns typical propagation delay, primarily from RC time constant (RON × CL). Measured delay is dominated by source driver and load capacitance, not the IC itself. This is confirmed in Dynamic Electrical Characteristics tables across all supply voltages (1.8 V/2.5 V/3.3 V) in DS40893.

Can PI3CH281QE operate with mixed supply and logic voltage levels?

Yes. Control inputs (EN, S1, S0) accept logic levels up to 3.6 V regardless of VCC, allowing 1.8 V device control using 3.3 V GPIO. Input signal rails (IAx, IBx) support 0–5 V swing at 3.3 V VCC, and 0–3.3 V at 2.5 V VCC - verified in "Logic Inputs" section of DS40893.