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

Diodes Incorporated PI3C3125QE

Name: PI3C3125QE
Brand: Diodes Incorporated
SKU: PI3C3125QE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3C3125QE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3C3125QE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,241

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Product details

Overview

PI3C3125QE from Diodes Incorporated is a 2.5V/3.3V, 4-bit, 2-port bus switch with individual active-low enables, featuring 5Ω ON-resistance, <0.25ns propagation delay, and >400MHz bandwidth. It operates rail-to-rail, supports hot insertion, and is used in high-speed data routing between processors and peripherals in embedded computing and docking systems.

For engineers reviewing the PI3C3125QE datasheet, PI3C3125QE pinout, PI3C3125QE application, or PI3C3125QE equivalent, key selection criteria include enable polarity (active-low), QSOP-16 package compatibility, 5V I/O tolerance, and sub-nanosecond switching performance in signal integrity–sensitive interfaces.

Technical Context

The PI3C3125QE implements four independent bilateral analog switches with CMOS transmission-gate architecture, each controlled by a dedicated /BE pin. Its near-zero propagation delay arises from low R_ON–C_OFF time constant (~0.25ns for 50pF load), not logic-based timing.

It functions as a passive signal path: when enabled, A_n connects directly to B_n with no level-shifting or buffering; V_CC sets switch voltage range (2.5V or 3.3V), while I/O pins tolerate up to 5V regardless of supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.5V or 3.3V ±10% - defines switch conduction range and logic threshold for enable inputs
ON Resistance	5Ω typ. - ensures minimal signal attenuation and impedance matching in high-speed buses
Bandwidth	>400MHz - supports DDR, PCIe Gen1, USB 2.0, and other high-frequency digital signals
Propagation Delay	0.25ns typ. - contributes negligible timing skew in synchronous data paths
I/O Tolerance	5V - allows interfacing with legacy 5V logic without external level shifters
Enable Polarity	Active-low (/BE0–/BE3) - matches standard 74LVC125 control logic and simplifies FPGA GPIO drive
Hot Insertion Support	Yes - prevents bus contention and power-up glitches during live module replacement

Pinout & Package

PI3C3125QE is supplied in a 16-pin QSOP (Q) package, 150-mil wide, RoHS-compliant and halogen-free. Pin pitch is 0.025", body width 0.209", and thermal pad absent.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	Supplies switch core and internal logic; must be decoupled locally to suppress ground bounce
GND	Ground reference	Common return for all signals and supply; critical for maintaining low-impedance return path
A0–A3	Input/Source bus terminals	Accept signals from upstream driver (e.g., CPU, FPGA); bidirectional when switch enabled
B0–B3	Output/Load bus terminals	Drive downstream loads (e.g., memory, peripheral); mirror A-side when enabled
/BE0–/BE3	Individual active-low enables	Control each switch independently; low = conductive path A_n↔B_n, high = Hi-Z isolation
NC (Pins 15,16)	No-connect	Not bonded; must remain unconnected to avoid parasitic coupling or ESD risk

Key Features

Feature	Design Value
Rail-to-rail analog switching	Supports full-swing signals from GND to VCC without clipping or distortion
5Ω low-impedance ON state	Minimizes insertion loss and maintains signal integrity in 50Ω–75Ω trace environments
Individual per-channel enables	Enables dynamic bus partitioning and selective signal gating without global reset
5V-tolerant I/O	Eliminates need for external level translators when interfacing mixed-voltage subsystems
Hot-insertion capability	Prevents back-driving and latch-up during live board insertion into powered backplanes

Applications

PCIe Gen1 Slot Sharing

USB 2.0 Port Multiplexing

Use Scenario: Sharing a single PCIe Gen1 x1 link between two expansion slots via software-controlled arbitration.

IC Role / Device Role / Timing Role: Bidirectional, low-latency signal path selector with sub-ns delay and 5V-tolerant signaling.

Use Value: Enables hardware-level slot sharing without retiming or protocol translation, preserving native PCIe timing compliance.

Use Scenario: Routing USB 2.0 D+/D− signals from one host controller to either of two downstream ports.

IC Role / Device Role / Timing Role: High-bandwidth analog switch isolating differential pairs during port selection.

Use Value: Maintains 480Mbps signal fidelity with <5Ω path resistance and <0.25ns skew across D+/D− pair.

Laptop Docking Station Data Switching

FPGA I/O Expansion Hub

Use Scenario: Switching DisplayPort AUX CH, SMBus, and sideband signals between laptop and dock during hot-plug events.

IC Role / Device Role / Timing Role: Hot-insertion–qualified bus switch providing glitch-free enable/disable transitions.

Use Value: Prevents bus contention and system lockup during live docking/undocking, meeting USB Type-C Alt Mode timing requirements.

Use Scenario: Expanding FPGA GPIO count by routing multiple peripheral buses (I²C, SPI, UART) through shared pins.

IC Role / Device Role / Timing Role: Low-capacitance (3.5pF C_IN) switch enabling clean signal routing without degrading rise/fall times.

Use Value: Reduces FPGA pin utilization by 4× while maintaining <10pF total loading on driving outputs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3244DBR	8-bit, 3.3V-only, active-high enables, SOIC-20 package	Higher channel count but no hot-insertion support or 5V I/O tolerance	Select when needing 8 channels and 3.3V-only operation; avoid for mixed-voltage or hot-swap use cases
PI3C3126QE	Same pinout and specs, but active-HIGH enables (/BE → BE)	Requires inverted control logic; identical electrical behavior otherwise	Choose based on existing enable signal polarity-no performance trade-off

Compared with SN74CBT3244DBR and PI3C3126QE, the PI3C3125QE uniquely combines active-low enables, 5V I/O tolerance, and verified hot-insertion capability in a 16-pin QSOP, making it optimal for mixed-voltage docking and PCIe resource sharing where control logic alignment and robustness are critical.

Availability

PI3C3125QE is available at Aetrix Electronics and suitable for PCIe Gen1 slot sharing, USB 2.0 port multiplexing, and laptop docking station data switching requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3C3125QE 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and power solutions for industrial, computing, and consumer markets.

The PI3C3125QE belongs to Diodes' Pericom bus switch product line, designed specifically for high-fidelity, low-latency signal routing in hot-pluggable computing and docking architectures.

FAQ

What is the maximum operating frequency supported by PI3C3125QE?

The PI3C3125QE supports >400MHz bandwidth, validated via small-signal AC analysis and eye-diagram testing at 480Mbps (USB 2.0) and 2.5Gbps (PCIe Gen1). Performance remains stable up to 500MHz under 50pF load with proper PCB layout and termination.

Can PI3C3125QE operate with a 2.5V supply while interfacing with 5V logic?

Yes. The device's I/O pins are 5V-tolerant regardless of VCC setting. With VCC = 2.5V, A/B pins accept input voltages from –0.5V to +5.5V and drive outputs rail-to-rail (0V to 2.5V), enabling safe interfacing with 5V peripherals without level shifters.

Is PI3C3125QE pin-compatible with standard 74-series logic devices?

Yes. It uses the industry-standard 74LVC125/126 pinout: VCC and GND match SOIC/TSSOP/QSOP footprints, and A/B/BE pin assignments align with 74x125 functional equivalents-enabling drop-in replacement in existing layouts with no redesign needed.

Does PI3C3125QE require external pull-up resistors on its enable pins?

Yes. The datasheet specifies that a pull-up resistor must be provided on each /BE pin for power-up protection, ensuring all switches default to high-impedance (disabled) state at power-on and preventing unintended bus contention before firmware initialization.

PI3C3125QE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

PI3C3125QE FAQ

1.How can I place an order for PI3C3125QE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3C3125QE 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 PI3C3125QE reliable?

The price and inventory of PI3C3125QE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125QE is usually 5 days.

3.What payment methods are accepted for PI3C3125QE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125QE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3C3125QE?

PI3C3125QE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3C3125QE 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 PI3C3125QE?

For technical support, including PI3C3125QE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125QE requirements.

6.How does Aetrix verify that PI3C3125QE is sourced from the original manufacturer or authorized distributors?

All PI3C3125QE 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 PI3C3125QE meets industry standards.

7.What is the process for return or replacement of PI3C3125QE?

All PI3C3125QE units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125QE, 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 PI3C3125QE part is unused and in its original packaging.

Return procedure for PI3C3125QE:

1.Submit a request within 90 days.

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

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