Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Diodes Incorporated PI5C3861Q

Name: PI5C3861Q
Brand: Diodes Incorporated
SKU: PI5C3861Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PI5C3861Q

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: PI5C3861Q.pdf

Description:: IC BUS SWITCH 10 X 1:1 24QSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,653

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PI5C3861Q from Pericom Semiconductor is a 10-bit, 2-port bus switch with 5 Ω on-resistance, active-low Bus Enable (BE) control, and 0.2 μA typical quiescent current, used for bidirectional signal routing in notebook and low-power embedded systems.

For engineers reviewing the PI5C3861Q datasheet, PI5C3861Q pinout, PI5C3861Q application, or PI5C3861Q equivalent, key selection criteria include propagation delay (<0.25 ns), high-impedance isolation during disable, TTL-compatible control inputs, and QSOP-24 packaging for space-constrained PCB layouts.

Technical Context

The PI5C3861Q implements a passive FET-based bus switch architecture-no internal logic or level-shifting-enabling true bidirectional, zero-propagation-delay signal pass-through between two 10-bit buses (A0–A9 and B0–B9) when BE is low. It operates solely at VCC = 5 V ±5% with no internal voltage regulation.

All 20 signal paths (10 A/B pairs) share identical electrical behavior: R_ON = 5 Ω (typ), C_OFF = 6 pF, C_ON = 8 pF, and I_OZ ≤ ±1 μA in high-impedance state. Control timing is defined by t_PZH/t_PLZ (1.5–5.5 ns disable) and t_PZH/t_PLZ (1.5–6.5 ns enable).

Key Specifications

Parameter	Value and Actual Design Meaning
On-Resistance (R_ON)	5 Ω typ - ensures minimal signal attenuation and voltage drop across switched paths at 48 mA drive
Propagation Delay	<0.25 ns - adds negligible timing overhead beyond RC delay of switch + load capacitance
Quiescent Current (I_CC)	0.2 μA typ - enables battery-backed operation and ultra-low standby power in portable systems
Input Capacitance (C_IN)	6 pF - minimizes loading on upstream drivers and preserves signal edge integrity
Switch Off Capacitance (C_OFF)	6 pF - reduces crosstalk and coupling between isolated bus segments
Bus Enable Timing (t_PZH/t_PLZ)	1.5–5.5 ns - supports fast bus arbitration and dynamic reconfiguration in real-time systems
V_IH/V_IL	2.0 V / 0.8 V - compatible with standard 5 V TTL logic thresholds without level translation

Pinout & Package

PI5C3861Q is housed in a 24-pin, 150-mil wide plastic QSOP (Quad Small Outline Package) with 0.635 mm lead pitch and standard JEDEC MO-137AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
BE	Active-Low Bus Enable Control Input	Asserting low connects all A/B pairs; high places all outputs in high-impedance state
A0–A9	Port A Signal Terminals	Bidirectional input/output pins tied directly to corresponding Bx switches when BE = L
B0–B9	Port B Signal Terminals	Bidirectional input/output pins connected to Ax only when BE = L; otherwise isolated
VCC	Positive Supply Rail	5 V ±5% supply; powers internal switch bias circuitry only-not signal path
GND	Ground Reference	Common return for supply and signal references; critical for noise immunity and R_ON stability
NC	No-Connect Terminal	Internally unconnected; must remain floating or grounded per layout best practices

Key Features

Feature	Design Value
Zero-propagation-delay switching	Signal passes through R_ON-C_ON path without added logic delay-preserves timing margins in high-speed buses
5 Ω low on-resistance	Enables direct connection of 50 Ω–100 Ω transmission lines with <1% voltage loss at 48 mA
0.2 μA quiescent current	Reduces system standby power by >95% vs. comparable logic-gated buffers in always-on subsystems
TTL-compatible control interface	Accepts standard 5 V TTL VIH/VIL thresholds-eliminates need for external level shifters on BE line
QSOP-24 Pb-free & Green option	PI5C3861QE variant meets RoHS/REACH requirements without derating or thermal penalty

Applications

PCI Express Lane Multiplexing

Notebook Memory Expansion Interface

Use Scenario: Dynamic allocation of PCIe lanes between GPU and NVMe SSD in thin-and-light laptops.

IC Role / Device Role / Timing Role: Bidirectional bus switch enabling lane rerouting without protocol-aware logic or clock domain crossing.

Use Value: Eliminates need for PCIe packet switch IC; reduces BOM cost and board area while maintaining sub-nanosecond signal integrity.

Use Scenario: Adding secondary DDR3 SODIMM slot controlled by EC firmware in convertible 2-in-1 platforms.

IC Role / Device Role / Timing Role: Isolating memory address/data/control lines between main SoC and expansion slot until enabled.

Use Value: Prevents signal contention and bus leakage during sleep states; supports hot-plug detection via BE assertion timing.

Industrial PLC I/O Module Backplane

Medical Imaging Data Acquisition Hub

Use Scenario: Reconfigurable sensor channel routing across modular analog/digital I/O cards in DIN-rail PLCs.

IC Role / Device Role / Timing Role: Low-latency, low-noise signal path selector for 10-bit parallel ADC/DAC interfaces.

Use Value: Avoids ground bounce and timing skew introduced by multiplexer ICs-critical for synchronized multi-channel sampling.

Use Scenario: Aggregating parallel LVDS outputs from multiple CMOS image sensors into shared FPGA preprocessing pipeline.

IC Role / Device Role / Timing Role: Passive bus gate enabling time-aligned pixel data transfer without introducing jitter or skew.

Use Value: Maintains <±50 ps inter-lane skew across 10-bit paths-meets DICOM real-time display latency requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3245APWR	8-bit (not 10-bit); R_ON = 6 Ω; t_PD = 0.25 ns; 24-pin TSSOP	Lacks two signal pairs-requires two devices for full 10-bit coverage; higher board area	Select if existing design uses TI ecosystem and 8-bit granularity suffices
74LVC1G3157GW	Single-pole double-throw (SPDT); 1-channel only; R_ON = 8 Ω; 6-pin SC-70	Requires ten discrete units for 10-bit function-increases routing complexity and assembly cost	Prefer only for ultra-low-pin-count prototypes or single-line debug isolation

Compared with SN74CBT3245APWR and 74LVC1G3157GW, the PI5C3861Q delivers native 10-bit integration, lowest R_ON, and smallest footprint per bit-making it optimal for production notebooks and space-constrained industrial controllers where signal count and power efficiency are co-critical.

Availability

PI5C3861Q is available at Aetrix Electronics and suitable for notebook platform design, industrial PLC backplanes, medical imaging hubs, and embedded data acquisition systems requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3861Q 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 CBTL/CBT-series bus switch family, engineered for low-latency, low-power, and low-noise bidirectional signal routing in portable and real-time embedded systems.

FAQ

What is the maximum operating frequency supported by PI5C3861Q?

The PI5C3861Q does not specify a maximum clock frequency because it is a passive switch-not a clocked device. Its usable bandwidth is determined by R_ON (5 Ω) and C_ON (8 pF), yielding an RC time constant of ~40 ps, supporting clean signal transmission up to >1 GHz for low-voltage swing signals under proper termination.

Can PI5C3861Q operate at 3.3 V supply?

No. The PI5C3861Q is specified only for VCC = 5 V ±5% operation. At 3.3 V, R_ON increases significantly (>15 Ω), VIH/VIL thresholds become non-compliant, and BE control may fail to fully enable the switch-per Absolute Maximum Ratings and DC Electrical Characteristics tables.

Is PI5C3861Q pin-compatible with PI5C3861QE?

Yes. PI5C3861QE is the Pb-free and Green-compliant version of PI5C3861Q, sharing identical pinout, package dimensions, electrical specifications, and thermal performance-differing only in lead finish and RoHS compliance documentation.

Does PI5C3861Q require external pull-up or pull-down resistors on BE?

No. The BE input has TTL-compatible thresholds and no internal pull-up/down. However, in systems where BE is driven by open-drain or unterminated sources, a 10 kΩ pull-up to VCC is recommended to ensure robust high-state definition and prevent metastability during power-up or reset.

PI5C3861Q Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 24-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 10 x 1:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QSOP

PI5C3861Q FAQ

1.How can I place an order for PI5C3861Q through Aetrix?

Please submit a Request for Quotation (RFQ) for PI5C3861Q on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PI5C3861Q reliable?

The price and inventory of PI5C3861Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI5C3861Q is usually 5 days.

3.What payment methods are accepted for PI5C3861Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI5C3861Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI5C3861Q?

PI5C3861Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI5C3861Q order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PI5C3861Q?

For technical support, including PI5C3861Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI5C3861Q requirements.

6.How does Aetrix verify that PI5C3861Q is sourced from the original manufacturer or authorized distributors?

All PI5C3861Q products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI5C3861Q meets industry standards.

7.What is the process for return or replacement of PI5C3861Q?

All PI5C3861Q units undergo pre-shipment inspection (PSI). If there is an issue with PI5C3861Q, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PI5C3861Q part is unused and in its original packaging.

Return procedure for PI5C3861Q:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…