Diodes Incorporated PI3CH400LE

Overview

PI3CH400LE from Diodes Incorporated is a 4-bit bus switch with active-low enables, designed for high-bandwidth signal routing in 1.8V/2.5V/3.3V systems. It delivers 500 MHz bandwidth, 4–8 Ω on-resistance (depending on supply), near-zero propagation delay (<0.3 ns), and rail-to-rail switching capability-enabling hot-plug data switching in backplane interfaces and high-speed I/O expansion.

For engineers reviewing the PI3CH400LE datasheet, PI3CH400LE pinout, PI3CH400LE application, or PI3CH400LE equivalent, key selection criteria include enable polarity (active-low), 5V-tolerant I/O under all supply states, industrial temperature range (–40°C to +85°C), ESD robustness (8 kV HBM), and dual-package availability (TSSOP-14 and QFN-14).

Technical Context

The PI3CH400LE implements four independent single-pole single-throw (SPST) analog switches controlled by individual active-low enable inputs (EN0–EN2). Each switch features low-capacitance paths (C_ON = 7.0 pF, C_OFF = 3.5 pF) and operates without introducing ground bounce or added propagation delay beyond RC time constant (~0.3 ns with 10 pF load).

It supports beyond-rail switching: 0–5 V signals with 3.3 V supply, 0–3.3 V with 2.5 V supply, and 0–2.5 V with 1.8 V supply. Input logic is 5 V tolerant regardless of V_CC, and quiescent current remains ≤0.5 mA at 3.6 V, enabling low-power hot-insertion operation.

Key Specifications

Pinout & Package

PI3CH400LE is available in Pb-free, RoHS-compliant 14-pin TSSOP (L) package (3.0 mm × 4.4 mm, 0.65 mm pitch), optimized for automated SMT assembly and thermal performance in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit bus switch applications.

Compared with SN74CBT3244PWR and PI3CH401LE, PI3CH400LE uniquely combines active-low enables, 1.8 V operation, and beyond-rail switching-making it optimal for low-voltage hot-plug systems where enable polarity and supply flexibility are critical.

Availability

PI3CH400LE is available at Aetrix Electronics and suitable for high-speed data bus switching, hot-pluggable backplane interfaces, and analog video routing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for PI3CH400LE 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 PI3CH400LE belongs to Diodes' Pericom® high-speed analog switch product line, engineered specifically for low-latency, rail-flexible signal routing in next-generation hot-plug and mixed-voltage I/O architectures.

FAQ

What is the maximum signal voltage the PI3CH400LE can pass with a 3.3 V supply?

The PI3CH400LE supports beyond-rail switching: with a 3.3 V supply, it reliably passes 0–5 V signals across its A-B channels. This is achieved through internal charge-pump circuitry and robust oxide design, eliminating the need for external level-shifting components in mixed-voltage systems.

Can PI3CH400LE be used in hot-plug applications with 12 V backplane rails?

Yes-PI3CH400LE tolerates up to 6 V on I/O pins for ≤20 ns during hot insertion. For 12 V backplanes, external clamping (e.g., TVS diodes) is required to limit transient exposure to within this specification; the device itself is not rated for sustained 12 V operation.

How does the active-low enable affect power-up behavior?

All enables default to high-impedance (Hi-Z) at power-up; an external pull-up resistor is required to hold ENx high and keep switches open until firmware asserts low. This prevents unintended signal coupling during boot, satisfying IEC 61000-4-2 and system-level safety requirements.

Is PI3CH400LE pin-compatible with PI3CH401LE?

Yes-PI3CH400LE and PI3CH401LE share identical pinout, package, and electrical specifications except enable polarity: PI3CH400LE uses active-low enables (ENx), while PI3CH401LE uses active-high (ENx̄). No PCB redesign is needed; only control logic polarity must be adjusted.