Diodes Incorporated PI3B3384QE

Overview

PI3B3384QE from Pericom Semiconductor is a 3.3 V, 10-bit, dual-port bus switch with two independent 5-bit enable controls (BEA and BEB), 5 Ω typical ON-resistance, 4.5 ns max switching time, and ultra-low quiescent current (0.1 μA typical), used to isolate or connect high-speed data buses in notebook and portable computing systems.

For engineers reviewing the PI3B3384QE datasheet, PI3B3384QE pinout, PI3B3384QE application, or PI3B3384QE equivalent, key selection criteria include bus enable logic polarity (active-low), per-port switching granularity, ON-resistance matching across channels, input voltage tolerance up to +3.6 V, and Pb-free QSOP-24 packaging compliance.

Technical Context

The PI3B3384QE implements a CMOS-based analog bus switch architecture with rail-to-rail input compatibility and no internal latching or buffering-signals pass through with only RC delay from 5 Ω R_ON and load capacitance. It operates strictly as a bidirectional, voltage-transparent path between A- and B-side 10-bit buses.

Control is fully static: BEA governs A0–A4/B0–B4, BEB governs A5–A9/B5–B9; both active-low enables allow independent 5-bit segment control. No propagation delay is added beyond intrinsic switch RC time constant (~0.25 ns for 50 pF load).

Key Specifications

Pinout & Package

PI3B3384QE is housed in a 24-pin QSOP (Quarter-Size Outline Package), 150-mil wide, Pb-free and RoHS-compliant (Green) package with standard 0.635 mm lead pitch and 0.203 mm lead thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384CPWR and PI3CH480QE, PI3B3384QE uniquely delivers 10-bit dual-segment control with lowest R_ON in its class, making it optimal for high-fidelity, multi-lane portable data routing where per-bit isolation and minimal insertion loss are critical.

Availability

PI3B3384QE is available at Aetrix Electronics and suitable for notebook memory expansion, embedded controller debug multiplexing, and industrial PLC I/O module bus isolation requiring stable component supply and long-term manufacturing continuity.

Supply support for PI3B3384QE 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 legacy bus switch portfolio remains widely deployed in computing and industrial systems.

The PI3Bxxx NanoSwitch™ product line targets low-latency, low-power digital bus isolation in space-constrained portable and embedded platforms, emphasizing zero-delay transparency and rail-to-rail interoperability.

FAQ

What is the maximum capacitive load the PI3B3384QE can drive without signal degradation?

The PI3B3384QE is characterized for loads up to 50 pF with ≤4.5 ns switching time. Its 5 Ω R_ON and 3.0 pF input capacitance yield a time constant of ~0.25 ns, ensuring minimal edge distortion on FR-4 traces up to 3 inch length at 100 MHz. For >50 pF loads, series termination or driver strength adjustment is recommended.

Can BEA and BEB be tied together for unified 10-bit control?

Yes - BEA and BEB may be connected to a single active-low enable signal to operate all 10 bits simultaneously. This configuration maintains full bidirectional functionality and preserves all electrical specs, including R_ON and switching speed. No additional components or timing adjustments are required.

Does the PI3B3384QE support hot-swap or live-insertion scenarios?

Yes - the device supports hot-plug operation when V_CC and GND are applied before control or data signals, per Pericom's power-sequencing guidance. Its high-impedance OFF-state (10 μA I_OFF) and ±0.5 V absolute maximum input rating prevent damage or back-driving during insertion into powered backplanes.

Is there a functional difference between PI3B3384Q and PI3B3384QE?

No functional difference exists: PI3B3384QE is the Pb-free and Green-compliant version of PI3B3384Q, sharing identical electrical specifications, timing, thermal performance, and pinout. The "E" suffix denotes RoHS-compliant materials and JEDEC-standard reflow profile compatibility, with no derating or operational trade-offs.