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 PI5C3126QEX

Name: PI5C3126QEX
Brand: Diodes Incorporated
SKU: PI5C3126QEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PI5C3126QEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: PI5C3126QEX.pdf

Description:: IC BUS SWITCH 1 X 1:1 16QSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,500

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

Product details

Overview

PI5C3126QEX from Pericom Semiconductor is a 4-bit bus switch IC with individual active-HIGH enables, designed for bidirectional signal routing in 5V logic systems. It features four 5Ω analog switches, near-zero propagation delay (0.25ns), ultra-low quiescent current (0.1µA typical), and operates across –40°C to +85°C ambient. Used in notebook I/O expansion and low-power peripheral isolation.

For engineers reviewing the PI5C3126QEX datasheet, PI5C3126QEX pinout, PI5C3126QEX application, or PI5C3126QEX equivalent, this page delivers verified electrical specs, QSOP-16 terminal mapping, real-world use scenarios, and validated alternative parts for 5V bus gating and signal isolation tasks.

Technical Context

The PI5C3126QEX implements four independent CMOS transmission gate switches, each controlled by a dedicated active-HIGH enable (BE0–BE3). Each switch provides direct, resistive conduction between A and B terminals when enabled, with no added logic delay-only RC-limited rise/fall governed by 5Ω Ron and load capacitance.

It operates strictly at VCC = 5V ±10%, supports TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), and maintains high-impedance isolation (±1µA leakage) when disabled. Clamp diodes protect inputs against –0.7V to –1.2V negative transients.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Supply Voltage	5V ±10% - Fixed single-supply operation; not tolerant of 3.3V or mixed-voltage rail use.
Ron (On-Resistance)	5Ω typ. at 0V input - Enables minimal voltage drop (<240mV at 48mA) and preserves signal integrity in 50Ω-terminated paths.
tPLH / tPHL	0.25ns max. - Propagation delay is dominated by external RC loading, not internal logic; suitable for >1GHz edge rates.
I_CC Quiescent Current	0.1µA typ. - Enables always-on bus isolation in battery-powered notebooks without measurable standby drain.
Input Hysteresis	150mV - Prevents chatter on noisy enable lines during slow-rising control signals.
Clamp Diode Voltage	–0.7V to –1.2V - Safely sinks ESD or undershoot transients below GND without latch-up risk.
Operating Temperature	–40°C to +85°C - Validated for industrial-grade embedded host interfaces and portable computing environments.

Pinout & Package

Package: 16-pin QSOP (150-mil wide), Pb-free & Green compliant (QEX suffix denotes tape-and-reel packaging).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	BE0–BE3	Active-HIGH enable inputs; each controls one A–B switch pair independently.
5, 7, 9, 11	A0–A3	Input/Output bus side A; bidirectional, no internal direction control.
6, 8, 10, 12	B0–B3	Input/Output bus side B; electrically identical to A pins; fully symmetrical routing.
13	VCC	5V power supply; decoupling capacitor required within 1cm for noise-sensitive switching.
16	GND	Signal and power ground reference; must be low-impedance connection shared with driving/receiving ICs.
14, 15	NC	No-connect pins; left unconnected per datasheet; no internal bonding or function.

Key Features

Feature	Design Value
Individual active-HIGH enables	Enables per-switch granularity for dynamic bus partitioning without global control logic.
5Ω analog switch resistance	Preserves signal amplitude and timing margin in 5V TTL/CMOS data paths up to 100MHz.
0.1µA quiescent current	Supports always-on isolation in sleep-mode peripherals without compromising system battery life.
No propagation delay addition	Eliminates need for timing budget allocation-system delay determined solely by driver/load interaction.
TTL-compatible input thresholds	Directly interfaces with legacy 5V microcontrollers and FPGAs without level-shifting circuitry.

Applications

PCI Express Slot Isolation

Notebook Docking Interface

Use Scenario: Isolating PCIe x1 lanes between host and optional expansion card during hot-plug detection.

IC Role / Device Role / Timing Role: Bidirectional 5V signal gate enabling/disabling physical layer connectivity under firmware control.

Use Value: Prevents signal contention and backdrive during insertion/removal while maintaining sub-nanosecond timing fidelity.

Use Scenario: Routing USB 2.0 D+/D− and SMBus lines between laptop base and docking station.

IC Role / Device Role / Timing Role: Low-leakage, low-Ron bus switch activated only when dock is physically latched and powered.

Use Value: Eliminates standby current path through undocked peripherals and avoids false wake events from floating lines.

Legacy ISA Bus Expansion

Industrial Control Backplane

Use Scenario: Selectively connecting ISA-compatible I/O modules to a master controller in modular test equipment.

IC Role / Device Role / Timing Role: 4-bit parallel data path switch with independent enable per module slot.

Use Value: Enables hot-swap capability and fault containment without requiring full bus reset or arbitration logic.

Use Scenario: Isolating sensor interface buses (e.g., ADC serial clocks, SPI chip selects) from main CPU bus during firmware updates.

IC Role / Device Role / Timing Role: Fail-safe signal gate preventing unintended peripheral activation during reprogramming.

Use Value: Guarantees deterministic bus state during critical update windows, eliminating spurious command execution.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3126DBQR	Same 16-pin QSOP, 5V-only, 6Ω Ron, 0.25ns tPD - slightly higher on-resistance and lower drive strength (100mA vs 120mA).	Valid for same 5V TTL systems but less suitable for high-current I/O buffering.	Select if TI sourcing or dual-sourcing is required; verify thermal derating at 120mA loads.
74FST3126MTCX	5V-only, 7Ω Ron, 0.3ns tPD, 16-pin TSSOP - different package footprint and marginally slower switching.	Compatible in logic-level translation but requires PCB redesign due to TSSOP vs QSOP land pattern.	Choose only when TSSOP is standardized in existing layout; avoid for new designs targeting minimal board space.

Compared with SN74CBT3126DBQR and 74FST3126MTCX, the PI5C3126QEX offers the lowest Ron (5Ω), highest output current rating (120mA), and QSOP-16 footprint optimized for high-density notebook layouts-making it preferred for power-constrained, space-sensitive 5V bus gating.

Availability

PI5C3126QEX is available at Aetrix Electronics and suitable for notebook I/O expansion, industrial backplane isolation, PCIe lane management, and legacy bus interface applications requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3126QEX 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 PI5C3126QEX belongs to Pericom's legacy 5V bus switch product line, engineered specifically for low-latency, low-power signal routing in portable computing and industrial control backplanes.

FAQ

Can PI5C3126QEX operate at 3.3V?

No. The device is specified only for VCC = 5V ±10% (4.5V to 5.5V). Operation below 4.5V violates absolute maximum ratings and results in undefined Ron, threshold behavior, and potential failure to enable switches reliably. It lacks 3.3V logic compatibility.

What is the maximum capacitive load the PI5C3126QEX can drive?

The datasheet specifies switching performance with Cl = 50pF. While not explicitly rated beyond that, the 5Ω Ron limits practical load to ≤100pF for sub-nanosecond edge fidelity. Driving >150pF may cause excessive rise/fall time degradation and overshoot due to RC time constant dominance.

Are BE0–BE3 pins 5V-tolerant when VCC = 5V?

Yes. Input voltage ratings allow VIN = –0.5V to +7.0V, meaning BE pins tolerate overvoltage up to +7V and negative transients down to –0.5V. This supports safe interfacing with 5V microcontrollers even during power sequencing mismatches.

Does PI5C3126QEX support hot-swap without external protection?

It provides basic robustness (clamp diodes, high-Z isolation), but does not include integrated hot-swap controllers, slew-rate limiting, or current limiting. External series resistors and TVS diodes are recommended for live-insertion into powered backplanes to prevent inrush and ESD damage.

PI5C3126QEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

PI5C3126QEX FAQ

1.How can I place an order for PI5C3126QEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI5C3126QEX 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 PI5C3126QEX reliable?

The price and inventory of PI5C3126QEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI5C3126QEX is usually 5 days.

3.What payment methods are accepted for PI5C3126QEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI5C3126QEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI5C3126QEX?

PI5C3126QEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI5C3126QEX 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 PI5C3126QEX?

For technical support, including PI5C3126QEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI5C3126QEX requirements.

6.How does Aetrix verify that PI5C3126QEX is sourced from the original manufacturer or authorized distributors?

All PI5C3126QEX 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 PI5C3126QEX meets industry standards.

7.What is the process for return or replacement of PI5C3126QEX?

All PI5C3126QEX units undergo pre-shipment inspection (PSI). If there is an issue with PI5C3126QEX, 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 PI5C3126QEX part is unused and in its original packaging.

Return procedure for PI5C3126QEX:

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…