Diodes Incorporated PI3B3861QE

Overview

PI3B3861QE from Pericom Semiconductor is a 3.3V, 10-bit, 2-port bus switch with 5Ω on-resistance, active-low bus enable (BE), and 4.5ns max switching time. It connects A0–A9 to B0–B9 bidirectionally with near-zero propagation delay and 0.1μA typical quiescent current, used in notebook I/O expansion and low-power data path routing.

For engineers reviewing the PI3B3861QE datasheet, PI3B3861QE pinout, PI3B3861QE application, or PI3B3861QE equivalent, key selection criteria include on-resistance matching, BE-active-low logic compatibility, QSOP-24 thermal profile, and sub-1ns RC-limited delay under 50pF load.

Technical Context

The PI3B3861QE implements ten independent bilateral analog switches controlled by a single active-low Bus Enable (BE) signal. Each switch exhibits matched 5–8Ω on-resistance at VCC = 3.0V and 0V input, with 16.0pF on-capacitance and 8.0pF off-capacitance at 1MHz.

It operates across –40°C to +85°C ambient with 3.3V ±10% supply, supports rail-to-rail logic inputs up to 3.6V, and draws only 0.1μA ICC in quiescent state-enabling hot-plug-safe, low-noise data path isolation without ground bounce.

Key Specifications

Pinout & Package

24-pin QSOP (Q) package: 150-mil body width, 0.65mm lead pitch, 8.56mm × 3.99mm outline, JEDEC MO-137B/AE compliant, Pb-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit bus switch applications.

Compared with SN74CBT3384CPW and 74LVC1G3157GW, the PI3B3861QE delivers optimal balance of 10-bit integration, 3.3V-native operation, QSOP thermal performance, and sub-5ns disable timing-making it the preferred choice for space-constrained, battery-sensitive 2-port routing.

Availability

PI3B3861QE is available at Aetrix Electronics and suitable for notebook I/O expansion, embedded test access, low-power sensor hub interface, and PCIe lane multiplexing requiring stable component supply and long-term lifecycle support.

Supply support for PI3B3861QE 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 signal integrity solutions, acquired by Diodes Incorporated in 2016; its timing, switching, and interface IC portfolio continues under Diodes' product stewardship.

The PI3B3861QE belongs to Pericom's NanoSwitch™ family-designed specifically for low-R_ON, low-C_ON, and ultra-low-I_CC analog bus switching in portable and thermally constrained applications.

FAQ

Is PI3B3861QE compatible with 2.5V logic control inputs?

Yes. The BE input accepts logic LOW ≤0.8V and logic HIGH ≥2.0V over –40°C to +85°C, and tolerates rail-to-rail input voltages up to 3.6V regardless of V_CC. A 2.5V logic HIGH exceeds the 2.0V V_IH minimum and fully satisfies guaranteed switching behavior.

Does PI3B3861QE support hot-swap insertion while V_CC is powered?

Yes, but only if V_CC and GND are established before applying any signal to BE, A, or B pins. The datasheet mandates this sequencing to prevent CMOS latch-up; violating it risks permanent damage even with 3.3V supply present.

What is the maximum capacitive load the PI3B3861QE can drive while maintaining 4.5ns t_PZH?

The 4.5ns t_PZH is specified with CL = 50pF and RL = 500Ω. At higher loads (e.g., 100pF), RC delay increases linearly-t_PZH ≈ 0.25ns × (CL/50pF). For 100pF, expected t_PZH is ~0.5ns; the 4.5ns limit remains valid only under the defined test conditions.

Can PI3B3861QE be used to switch analog audio signals below 20kHz?

No. Though bidirectional and low-R_ON, its 16pF C_ON and lack of THD/SNR characterization make it unsuitable for audio path switching. It is specified and tested exclusively for digital data routing (USB, I²C, JTAG) where bandwidth >100MHz and signal integrity metrics differ fundamentally from audio requirements.