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

Diodes Incorporated PI3C3125LE

Name: PI3C3125LE
Brand: Diodes Incorporated
SKU: PI3C3125LE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3C3125LE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI3C3125LE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,092

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Product details

Overview

PI3C3125LE from Diodes Incorporated is a 4-bit, 2.5V/3.3V bus switch with individual active-low enables, featuring 5-Ω ON-resistance, near-zero propagation delay (0.25 ns), and >400 MHz bandwidth. It supports rail-to-rail switching, 5V I/O tolerance, and hot insertion in high-speed data routing applications such as PCIe Gen1/2 signal isolation and memory bus multiplexing.

For engineers reviewing the PI3C3125LE datasheet, PI3C3125LE pinout, PI3C3125LE application, or PI3C3125LE equivalent, key selection criteria include per-channel enable control, sub-nanosecond enable/disable timing (1.5–6.5 ns), 5-Ω analog switch resistance, and compatibility with 14-pin TSSOP (L) packaging for space-constrained PCB layouts.

Technical Context

The PI3C3125LE implements four independent bidirectional analog switches, each controlled by a dedicated active-low Bus Enable (BE_n) input. When enabled, the A_n–B_n path exhibits near-ideal resistive conduction (5 Ω typical) with no added logic delay-only RC-limited transient response determined by load capacitance and switch resistance.

It operates at 2.5V or 3.3V supply, tolerates 5V on I/O pins, and maintains high-impedance isolation (±1 µA leakage) when disabled. The device's low input/output capacitance (3.5 pF C_IN, 5.0 pF C_OFF) preserves signal integrity in >400 MHz applications including DDR clock distribution and USB 2.0 data path switching.

Key Specifications

Parameter	Value and Actual Design Meaning
ON Resistance	5 Ω typical - ensures minimal voltage drop and signal attenuation across A–B path at 2.5V/3.3V operation
Propagation Delay	0.25 ns - contributes negligible timing skew in high-speed serial or parallel bus routing
Bandwidth	>400 MHz - supports full-rate switching of USB 2.0, PCIe Gen1, and DDR2 clock/data signals
I/O Voltage Tolerance	5V - allows interfacing with legacy 5V logic without level-shifting circuitry
Enable Timing (tPZH/tPHZ)	1.5–6.5 ns - enables precise, channel-level gating of high-frequency data streams
Supply Voltage Range	2.5V ±10% or 3.3V ±10% - compatible with dual-voltage system domains
Input Capacitance	3.5 pF - minimizes loading on driving source, preserving edge rate in fast-switching nodes

Pinout & Package

PI3C3125LE is packaged in a 14-pin TSSOP (170-mil wide, L suffix), Pb-free and RoHS-compliant. Pin mapping follows industry-standard 74XX125 layout for drop-in compatibility with legacy bus buffers.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power Supply Input	2.5V or 3.3V core supply; powers internal switch control logic and gate drivers
GND	Ground Reference	Common return path for all I/O and supply currents; critical for noise immunity and impedance matching
A0–A3	Input/Source Terminal	Bidirectional analog input port; connects to upstream driver (e.g., CPU, FPGA output)
B0–B3	Output/Load Terminal	Bidirectional analog output port; routes signal to downstream load (e.g., memory, PHY)
BE0–BE3	Active-Low Enable Control	Individual gate control: low = connect A_n–B_n, high = high-Z isolation

Key Features

Feature	Design Value
Near-zero propagation delay	0.25 ns adds no measurable timing budget penalty in high-speed interconnects
5-Ω analog switch resistance	Enables <10 mV drop at 20 mA, preserving signal amplitude integrity in 50-Ω systems
Rail-to-rail switching capability	Supports full-swing analog/digital signals from GND to VCC without clipping or distortion
Hot-insertion support	Prevents bus contention during live board insertion via controlled enable sequencing and I/O clamping
5V-tolerant I/O pins	Eliminates external level shifters when interfacing with 5V peripherals in mixed-voltage designs

Applications

PCIe Gen1 Signal Isolation

DDR2 Memory Bus Multiplexing

Use Scenario: Isolating PCIe reference clock or sideband signals between add-in card and host during hot-plug events.

IC Role / Device Role / Timing Role: Bidirectional analog switch with per-lane enable control, providing glitch-free clock path gating.

Use Value: Prevents clock domain conflicts and ground bounce during insertion/removal while maintaining sub-ns timing alignment.

Use Scenario: Sharing a single DDR2 address/control bus between two memory modules using time-division routing.

IC Role / Device Role / Timing Role: Low-resistance, high-bandwidth analog switch enabling fast bus arbitration without signal degradation.

Use Value: Achieves 400+ MHz switching with <5 Ω R_ON, eliminating need for active repeaters or complex bus buffers.

USB 2.0 Data Path Switching

FPGA I/O Expansion Interface

Use Scenario: Routing USB 2.0 D+/D− differential pairs between multiple host controllers and peripheral ports.

IC Role / Device Role / Timing Role: High-fidelity analog switch supporting 480 Mbps signaling with minimal jitter accumulation.

Use Value: Maintains eye diagram integrity via low C_OFF (5.0 pF) and matched A/B path impedance.

Use Scenario: Expanding FPGA GPIO count by dynamically connecting subsets of I/O banks to shared external peripherals.

IC Role / Device Role / Timing Role: Channel-selectable bus switch enabling flexible pin mapping without FPGA reconfiguration.

Use Value: Reduces PCB layer count and BOM cost versus discrete MOSFET-based solutions while ensuring 5V-tolerant interface.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3125PW	5-V-only supply; 6-Ω R_ON; no 2.5V operation; 14-pin TSSOP	Requires 5V rail; unsuitable for 2.5V-only systems or mixed-voltage hot-swap	Select if system uses only 5V logic and needs TI-qualified automotive-grade variant
PI3C3126LEX	Same die, active-HIGH enables; identical R_ON, bandwidth, and packaging	Replaces PI3C3125LE where enable polarity must match positive-logic control architecture	Drop-in replacement when BE_n drive is sourced from open-drain or inverted logic outputs

Compared with SN74CBT3125PW and PI3C3126LEX, the PI3C3125LE uniquely supports dual-supply operation (2.5V/3.3V), offers lower R_ON, and provides active-low enable polarity optimized for power-up-safe isolation in hot-plug systems.

Availability

PI3C3125LE is available at Aetrix Electronics and suitable for PCIe Gen1 signal isolation, DDR2 memory bus multiplexing, and USB 2.0 data path switching requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3C3125LE 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 PI3C3125LE belongs to Diodes' high-bandwidth bus switch product line, designed specifically for low-latency, hot-pluggable signal routing in multi-protocol embedded systems with strict timing and voltage flexibility requirements.

FAQ

What is the maximum operating frequency supported by the PI3C3125LE?

The PI3C3125LE supports signal switching up to >400 MHz, verified by bandwidth characterization and 50-pF load propagation delay testing. Its 5-Ω R_ON and 5.0 pF C_OFF ensure minimal signal degradation at USB 2.0 (480 Mbps) and PCIe Gen1 (2.5 GT/s) data rates.

Can the PI3C3125LE operate with a 2.5V supply and interface with 5V logic?

Yes. The PI3C3125LE operates from a 2.5V ±10% supply and features 5V-tolerant I/O pins, allowing direct connection to 5V peripherals without external level shifters. Input voltage range extends to –0.5V to +5.5V, supporting robust mixed-voltage system integration.

How does the PI3C3125LE handle hot insertion?

The PI3C3125LE supports hot insertion through its high-impedance disable state (±1 µA leakage), 5V-tolerant I/O clamping diodes, and active-low enable architecture that defaults to isolation at power-up when BE_n is pulled high via external resistor, preventing bus contention.

Is there a pin-compatible alternative with active-HIGH enable logic?

Yes-the PI3C3126LEX is functionally identical and pin-compatible but features active-HIGH enable inputs (BE_n). It shares the same 14-pin TSSOP package, 5-Ω R_ON, >400 MHz bandwidth, and 2.5V/3.3V operation, differing only in enable polarity for control logic compatibility.

PI3C3125LE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm 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:: 14-TSSOP

PI3C3125LE FAQ

1.How can I place an order for PI3C3125LE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3C3125LE 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 PI3C3125LE reliable?

The price and inventory of PI3C3125LE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125LE is usually 5 days.

3.What payment methods are accepted for PI3C3125LE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125LE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3C3125LE?

PI3C3125LE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3C3125LE 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 PI3C3125LE?

For technical support, including PI3C3125LE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125LE requirements.

6.How does Aetrix verify that PI3C3125LE is sourced from the original manufacturer or authorized distributors?

All PI3C3125LE 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 PI3C3125LE meets industry standards.

7.What is the process for return or replacement of PI3C3125LE?

All PI3C3125LE units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125LE, 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 PI3C3125LE part is unused and in its original packaging.

Return procedure for PI3C3125LE:

1.Submit a request within 90 days.

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

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