Diodes Incorporated PI3CH3305UEX

Overview

PI3CH3305UEX from Pericom Semiconductor is a 2-bit, high-bandwidth bus switch with active-high enable, designed for low-latency signal routing in mixed-voltage systems. It operates across 1.8V, 2.5V, and 3.3V supplies; delivers 500 MHz bandwidth; supports rail-to-rail switching (0–5V with 3.3V V_CC); and features 5 Ω typical on-resistance. It is used in hot-plug data paths of telecom backplanes and high-speed digital interfaces.

For engineers reviewing the PI3CH3305UEX datasheet, PI3CH3305UEX pinout, PI3CH3305UEX application, or PI3CH3305UEX equivalent, this page provides verified electrical parameters, package mapping to MSOP-8, real-world switching behavior under hot-insertion conditions, and validated alternatives for voltage-flexible bus isolation.

Technical Context

The PI3CH3305UEX implements two independent, bidirectional analog/digital switches controlled by a single active-high enable input per channel. Each switch exhibits near-zero propagation delay (<0.3 ns) and sub-10 Ω on-resistance across all supported supply voltages (1.8V/2.5V/3.3V), enabling transparent signal pass-through without timing skew or ground bounce.

Its 5V-tolerant I/O pins support hot insertion into live backplanes, while clamp diodes and 8 kV HBM ESD protection ensure robustness during plug-in events. The device maintains high off-isolation (–60 dB) and low crosstalk (–60 dB) up to 500 MHz, making it suitable for differential and high-fidelity analog signal routing.

Key Specifications

Pinout & Package

PI3CH3305UEX is housed in an 8-pin MSOP (U) package, 3.0 mm × 3.0 mm × 0.85 mm body, with 0.65 mm pitch and exposed thermal pad (not electrically connected). Pin 1 is marked with a dot; pin numbering follows standard MSOP convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-bit bus switch applications.

Compared with SN74CBT3244PWR and TS3A226AEYFFR, PI3CH3305UEX uniquely combines 1.8–3.3 V supply flexibility, 5 V I/O tolerance, 500 MHz bandwidth, and industrial-grade hot-plug robustness-making it the only option for mixed-voltage telecom and datacom hot-swap designs.

Availability

PI3CH3305UEX is available at Aetrix Electronics and suitable for telecom backplane hot-swapping, USB 2.0 signal routing, and dual-channel LVDS multiplexing requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for PI3CH3305UEX 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

Pericom Semiconductor was a fabless provider of high-speed interface and signal integrity solutions, acquired by Diodes Incorporated in 2016. Its portfolio emphasized low-latency, low-power, and robust analog switches and clock products.

The PI3CH3305 belongs to Pericom's CH-series high-bandwidth bus switch family, engineered specifically for hot-plug-capable, multi-voltage data path isolation in telecom, datacom, and industrial infrastructure equipment.

FAQ

What is the maximum allowable transient voltage on A/B pins during hot insertion?

The PI3CH3305UEX tolerates up to 6 V on any A or B pin for durations ≤20 ns without damage or latch-up, provided V_CC is present. This rating is validated per JEDEC JESD78 and applies independently of supply voltage (1.8 V/2.5 V/3.3 V). Exceeding either voltage or time limit risks permanent failure.

Can PI3CH3305UEX operate with 1.8 V supply while switching 3.3 V signals?

No. While I/O pins tolerate up to 6 V, the signal swing must remain within the rail-to-rail range defined by V_CC: for 1.8 V supply, max switching range is 0–1.8 V; for 2.5 V supply, 0–2.5 V; for 3.3 V supply, 0–5 V. Switching 3.3 V signals requires ≥2.5 V V_CC, and 5 V signals require 3.3 V V_CC.

Is the enable input (EN) 5 V tolerant when V_CC = 1.8 V?

Yes. EN pins are 5 V tolerant regardless of V_CC level. With V_CC = 1.8 V, EN accepts 0–5 V logic levels. VIH is guaranteed ≥1.2 V and VIL ≤0.6 V, ensuring reliable recognition of standard 3.3 V or 5 V control signals without external level shifting.

Does PI3CH3305UEX support differential signaling such as LVDS or RS-422?

Yes. Its 500 MHz bandwidth, low crosstalk (–60 dB), matched 5 Ω R_ON per channel, and symmetric A↔B architecture preserve differential pair integrity. It has been validated in LVDS applications with 350 mV swing and 100 Ω termination, maintaining eye opening and jitter below 15 ps RMS at 400 Mbps.