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

Diodes Incorporated PI3C3125WEX

Name: PI3C3125WEX
Brand: Diodes Incorporated
SKU: PI3C3125WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3C3125WEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: PI3C3125WEX.pdf

Description:: IC BUS SWITCH 1 X 1:1 14SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI3C3125WEX 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 microcontrollers and peripheral buses in embedded computing systems.

For engineers reviewing the PI3C3125WEX datasheet, PI3C3125WEX pinout, PI3C3125WEX application, or PI3C3125WEX equivalent, key selection criteria include enable polarity (active-low), SOIC-14 package compatibility, 5V I/O tolerance, and low-capacitance switching for signal integrity in DDR, PCIe, or USB 2.0 auxiliary path designs.

Technical Context

The PI3C3125WEX 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 absence of internal logic-only R_ON-C_OFF RC time constant (≤0.25ns @ 50pF) governs timing.

It supports dual supply operation (2.5V or 3.3V), maintains rail-to-rail signal swing, and tolerates 5V on A/B pins regardless of V_CC. The device achieves hot-insertion capability via power-up sequencing where /BE pins default to high-impedance until enabled, preventing bus contention during live insertion.

Key Specifications

Parameter	Value and Actual Design Meaning
ON Resistance	5 Ω typical - ensures minimal voltage drop and signal attenuation across switched paths at 2.5V/3.3V supplies.
Bandwidth	>400 MHz - preserves edge integrity for high-speed digital signals including USB 2.0 and LVDS auxiliary channels.
Propagation Delay	0.25 ns typical - contributes negligible timing skew in synchronous bus architectures.
I/O Tolerance	5V tolerant on A/B pins - allows interfacing with legacy 5V peripherals without level shifters.
Enable Polarity	Active-low (/BE0–/BE3) - matches standard 74xx125 logic family control interface for drop-in replacement.
Input Capacitance	3.5 pF - reduces loading on driving sources and improves high-frequency signal fidelity.
Supply Voltage	2.5V or 3.3V ±10% - supports modern low-voltage system rails while maintaining compatibility with older 3.3V designs.

Pinout & Package

PI3C3125WEX is housed in a 14-pin, 150-mil wide plastic SOIC (W) package with industry-standard 74xx125 pinout. Pin 1 is V_CC, pin 7 is GND, and all /BE and A/B signals are arranged for direct PCB layout compatibility with legacy bus switch footprints.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Power supply input	2.5V or 3.3V supply rail; powers internal switch transistors and bias circuitry.
GND	Ground reference	Common return path for all switch current and logic thresholds.
/BE0–/BE3	Individual bus enable inputs	Active-low controls for each of four independent A↔B switches; high-impedance when deasserted.
A0–A3	Input side of bus switch	Source node for bidirectional signal flow; accepts 5V-tolerant inputs.
B0–B3	Output side of bus switch	Sink node for bidirectional signal flow; mirrors A-side when corresponding /BE is low.

Key Features

Feature	Design Value
Rail-to-rail analog switching	Preserves full signal swing from GND to V_CC without clipping, enabling clean TTL/CMOS/LVCMOS level translation.
Hot-insertion support	Guaranteed high-impedance state at power-up due to /BE pull-up requirement, eliminating bus contention during live module insertion.
5V I/O tolerance	Allows connection to 5V peripherals while operating from 2.5V/3.3V supply-reduces need for external level translators.
Low ON capacitance (10 pF)	Minimizes signal distortion and crosstalk in high-density routing; critical for maintaining eye diagram integrity above 200 MHz.
Industry-standard 74xx125 pinout	Enables direct PCB footprint reuse and schematic symbol compatibility with legacy designs and tooling libraries.

Applications

PCIe Auxiliary Lane Switching

USB 2.0 ID/SRP Detection Routing

Use Scenario: Dynamic reconfiguration of PCIe AUX channel connections between host controller and multiple add-in cards in modular server backplanes.

IC Role / Device Role / Timing Role: Bidirectional analog switch enabling hot-pluggable AUX lane arbitration without interrupting main link operation.

Use Value: Eliminates mechanical relays or complex FPGA-based routing, reducing BOM cost and latency by 3.2 ns per path versus discrete MOSFET solutions.

Use Scenario: Selecting between onboard USB PHY and external OTG connector for ID pin and SRP detection in portable medical devices.

IC Role / Device Role / Timing Role: Low-latency, 5V-tolerant analog multiplexer routing USB ID and VBUS sense lines to correct PHY based on cable insertion status.

Use Value: Enables single-PCB design supporting both host and peripheral modes with <1 ns added jitter-critical for USB 2.0 eye compliance.

DDR Memory Channel Isolation

Industrial CAN Transceiver Bus Enable

Use Scenario: Isolating DDR3/DDR4 command/address lines during memory training or firmware update sequences in industrial HMIs.

IC Role / Device Role / Timing Role: High-bandwidth, low-R_ON switch decoupling CA bus from DRAM controller during calibration phases.

Use Value: Prevents signal reflections and timing violations during dynamic retraining; R_ON ≤5Ω ensures <±15mV voltage error at 20mA drive.

Use Scenario: Enabling/disabling CAN transceiver standby mode in automotive body control modules using microcontroller GPIOs.

IC Role / Device Role / Timing Role: Logic-level translator and isolation gate controlling transceiver V_IO and standby pins with precise timing coordination.

Use Value: Reduces quiescent current by 87% vs. direct MCU pin drive; 1.5ns enable time meets ISO 11898-2 wake-up timing requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3125PW	5V-only supply (4.5–5.5V); no 2.5V operation; 6Ω R_ON; active-high enables	Requires level-shifting for 2.5V systems; not suitable for hot-insertion due to undefined power-up state	Select only if system uses 5V logic exclusively and board layout already accommodates TSSOP-14 footprint.
PI3C3126LEX	Same silicon die but active-high enables; offered in 14-pin TSSOP (L) package	Direct functional replacement where control logic uses active-high signaling; identical R_ON, bandwidth, and I/O tolerance	Choose when existing firmware or CPLD logic drives enables high-active; avoids inverting logic gates in new designs.

Compared with SN74CBT3125PW and PI3C3126LEX, PI3C3125WEX uniquely supports dual-supply operation (2.5V/3.3V) with active-low enables in SOIC-14-a combination essential for retrofitting legacy 74xx125-based boards while meeting modern low-voltage power budgets.

Availability

PI3C3125WEX is available at Aetrix Electronics and suitable for PCIe auxiliary lane switching, USB 2.0 ID routing, and DDR memory channel isolation requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI3C3125WEX 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 management solutions for industrial, computing, and communications markets.

The PI3C3125WEX belongs to Diodes' Pericom® bus switch product line, engineered specifically for low-latency, high-fidelity signal routing in mixed-voltage digital systems where timing predictability and hot-swap reliability are critical.

FAQ

What is the maximum recommended load capacitance for reliable 400MHz operation?

The PI3C3125WEX maintains >400MHz bandwidth with ≤5pF total trace + load capacitance per channel. At 50pF (test condition), bandwidth drops to ~200MHz due to R_ON-C_LOAD pole; layout must minimize stub length and use controlled-impedance routing to preserve high-frequency response.

Does PI3C3125WEX require external pull-up resistors on /BE pins?

Yes-a 10kΩ pull-up resistor to V_CC is required on each /BE pin for power-up safety, as specified in the truth table footnote. This ensures all switches remain in high-impedance state until firmware asserts the enables, preventing bus contention during boot.

Can PI3C3125WEX be used with 1.8V logic interfaces?

No-PI3C3125WEX is not rated for 1.8V V_CC operation. Its minimum supply is 2.5V, and input thresholds scale with V_CC. Driving /BE with 1.8V logic may result in indeterminate enable states; a level shifter or 2.5V-compatible GPIO is required.

Is PI3C3125WEX qualified for automotive applications?

PI3C3125WEX is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., PI3C3125QEX-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening-but WEX suffix denotes commercial-grade SOIC packaging without automotive qualification.

PI3C3125WEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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:: 14-SOIC

PI3C3125WEX FAQ

1.How can I place an order for PI3C3125WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3C3125WEX 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 PI3C3125WEX reliable?

The price and inventory of PI3C3125WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125WEX is usually 5 days.

3.What payment methods are accepted for PI3C3125WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3C3125WEX?

PI3C3125WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3C3125WEX 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 PI3C3125WEX?

For technical support, including PI3C3125WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125WEX requirements.

6.How does Aetrix verify that PI3C3125WEX is sourced from the original manufacturer or authorized distributors?

All PI3C3125WEX 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 PI3C3125WEX meets industry standards.

7.What is the process for return or replacement of PI3C3125WEX?

All PI3C3125WEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125WEX, 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 PI3C3125WEX part is unused and in its original packaging.

Return procedure for PI3C3125WEX:

1.Submit a request within 90 days.

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

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