Diodes Incorporated PI3CH3345ZHEX

Overview

PI3CH3345ZHEX from Diodes Incorporated (acquired Pericom Semiconductor) is an 8-bit, dual-enable bus switch IC with rail-to-rail analog signal switching capability, 500 MHz bandwidth, <0.3 ns propagation delay, and 5 Ω typical on-resistance. It operates from 1.8V/2.5V/3.3V supplies, supports hot-plug insertion, and is used in high-speed data path isolation for telecom backplanes and FPGA I/O expansion.

For engineers reviewing the PI3CH3345ZHEX datasheet, PI3CH3345ZHEX pinout, PI3CH3345ZHEX application, or PI3CH3345ZHEX equivalent, key selection criteria include dual active-low enable timing (1.5–25 ns enable/disable), 5V-tolerant I/O under all supply states, ESD robustness (8 kV HBM), and TQFN-20 package thermal performance in space-constrained routing.

Technical Context

The PI3CH3345ZHEX implements eight independent bidirectional analog/digital switches controlled by two complementary active-low enables (EN and EN), enabling precise channel gating without ground bounce or added propagation delay. Its architecture supports simultaneous switching of A0–A7 to B7–B0 with no internal logic or latching.

It delivers rail-to-rail signal pass-through: 0–5 V with 3.3 V supply, 0–3.3 V with 2.5 V supply, and 0–1.8 V with 1.8 V supply - enabled by integrated clamp diodes (VIK ≤ –1.8 V) and 5 V I/O tolerance regardless of VCC state. Dynamic performance is defined by 500 MHz –3 dB bandwidth and <0.3 ns intrinsic propagation delay.

Key Specifications

Pinout & Package

PI3CH3345ZHEX uses a 20-pin TQFN (ZH) package with 0.5 mm pitch, 4 mm × 4 mm body, and exposed thermal pad for enhanced power dissipation in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384CPWR and TS3L301RGTR, PI3CH3345ZHEX uniquely combines dual-enable control, 500 MHz bandwidth, 5 V I/O tolerance in all states, and –40°C to +85°C operation-making it the only option qualified for telecom hot-swap and high-fidelity analog routing in mixed-supply systems.

Availability

PI3CH3345ZHEX is available at Aetrix Electronics and suitable for telecom backplane switching, FPGA I/O expansion, USB 2.0 routing, and differential video path switching requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3CH3345ZHEX 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 acquired Pericom Semiconductor in 2017 and integrates its high-speed interface portfolio into signal integrity solutions for datacom, computing, and industrial markets.

The PI3CH3345ZHEX belongs to Pericom's legacy high-bandwidth analog bus switch family, designed specifically for zero-delay, rail-to-rail signal routing in hot-pluggable infrastructure equipment.

FAQ

What is the maximum signal frequency supported by PI3CH3345ZHEX?

The PI3CH3345ZHEX has a –3 dB bandwidth of 500 MHz, verified across 1.8 V, 2.5 V, and 3.3 V supply conditions. This enables reliable transmission of signals up to 480 Mbps (USB 2.0), 1.25 Gbps (CPRI), and 2.5 Gbps (PCIe Gen1) without measurable attenuation or phase distortion.

Can PI3CH3345ZHEX operate with mixed supply and I/O voltages?

Yes. The device supports rail-to-rail switching: with 3.3 V supply, it passes 0–5 V signals; with 2.5 V supply, 0–3.3 V; and with 1.8 V supply, 0–1.8 V. Its 5 V-tolerant I/O pins function safely regardless of VCC state, enabling use in mixed-voltage backplanes.

How does the dual-enable (EN/EN) configuration improve system reliability?

The complementary active-low enables require coordinated assertion (EN=L, EN=H) to activate the switch, preventing accidental channel connection during power-up/down transients. This eliminates glitches during hot-insertion and ensures deterministic isolation in fault-tolerant telecom systems.

Is external decoupling required for stable high-frequency operation?

Yes. A 0.1 µF ceramic capacitor must be placed within 3 mm of the VCC pin (Pin 20) and GND (Pin 10), with additional bulk capacitance (e.g., 4.7 µF) nearby. This maintains low-impedance AC return paths essential for preserving 500 MHz signal fidelity and minimizing supply-induced crosstalk.