Diodes Incorporated PI5C3861QEX

Overview

PI5C3861QEX from Pericom Semiconductor is a 10-bit, 2-port bus switch IC with 5Ω on-resistance, active-low Bus Enable (BE) control, and 0.2μA typical quiescent current. It provides direct A-to-B or B-to-A signal routing without propagation delay or ground bounce, used in notebook memory expansion and low-power I/O isolation circuits.

For engineers reviewing the PI5C3861QEX datasheet, PI5C3861QEX pinout, PI5C3861QEX application, or PI5C3861QEX equivalent, key selection criteria include bus enable timing (tPZH/tPHZ ≤ 6.5/5.5 ns), on-resistance (5–7 Ω), input hysteresis (150 mV), and QSOP-24 package compatibility for space-constrained embedded designs.

Technical Context

The PI5C3861QEX implements ten independent bilateral analog switches controlled by a single active-low BE signal. Each switch connects corresponding A_0–9 and B_0–9 terminals with near-zero propagation delay and no added logic inversion or level translation.

It operates over –40°C to +85°C at V_CC = 5V ±5%, supports TTL-compatible inputs (V_IH ≥ 2.0V, V_IL ≤ 0.8V), and maintains high-impedance isolation (I_OZ ≤ ±1 μA) when disabled - critical for hot-swap and dynamic bus partitioning.

Key Specifications

Pinout & Package

Package: 24-pin QSOP (150-mil wide, Pb-free & Green compliant, tape-and-reel). Dimensions: 8.56 mm × 3.99 mm × 1.75 mm (L × W × H), 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384APW and 74LVC1G3157GW, the PI5C3861QEX delivers superior timing precision (0.25 ns vs. 10 ns propagation), lower on-resistance (5 Ω vs. 7 Ω), and integrated 10-bit functionality in a single QSOP-24 package - making it optimal for space- and timing-sensitive notebook and industrial backplane designs.

Availability

PI5C3861QEX is available at Aetrix Electronics and suitable for notebook memory expansion, industrial hot-swap backplanes, and PCIe lane multiplexing requiring stable component supply across long-life production cycles.

Supply support for PI5C3861QEX 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 specializing in high-speed interface, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2017.

The PI5C3861 belongs to Pericom's legacy bus switch product line, engineered specifically for low-latency, low-power bidirectional signal routing in portable computing and industrial control systems.

FAQ

What is the maximum operating voltage for PI5C3861QEX?

The PI5C3861QEX is rated for V_CC = 5V ±5% (4.75V to 5.25V) under normal operation. Absolute maximum supply voltage is +7.0V, but sustained operation above 5.25V risks parametric shift and reduced reliability. The device does not support 3.3V-only or mixed-voltage operation.

Can PI5C3861QEX be used with 3.3V logic signals?

Yes - its TTL-compatible inputs accept V_IH ≥ 2.0V and V_IL ≤ 0.8V, fully compatible with 3.3V CMOS/TTL logic levels. However, the switch conducts between A and B ports at the applied V_CC (5V), so 3.3V signals pass through without level shifting, preserving their original amplitude.

Is PI5C3861QEX pin-compatible with PI5C3861QE?

Yes - PI5C3861QEX and PI5C3861QE share identical pinout, electrical specifications, and mechanical dimensions. The "X" suffix denotes tape-and-reel packaging; "E" indicates Pb-free/Green compliance. Both use the same 24-pin QSOP footprint and may be interchanged in PCB layouts.

Does PI5C3861QEX require external pull-up or pull-down resistors on BE?

No - the BE input has built-in hysteresis (150 mV) and TTL-compatible thresholds, eliminating need for external biasing. However, for noise immunity in electrically noisy environments, a 10kΩ pull-down resistor to GND is recommended to ensure defined low-state during power-up or floating conditions.