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

Diodes Incorporated PI3C3125LEX

Name: PI3C3125LEX
Brand: Diodes Incorporated
SKU: PI3C3125LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3C3125LEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3C3125LEX.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,490

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Product details

Overview

PI3C3125LEX from Diodes Incorporated is a 2.5V/3.3V, 4-bit, 2-port bus switch with individual active-low enables, featuring 5Ω ON-resistance, near-zero propagation delay (0.25 ns), 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 systems.

For engineers reviewing the PI3C3125LEX datasheet, PI3C3125LEX pinout, PI3C3125LEX application, or PI3C3125LEX equivalent, key selection criteria include enable polarity (active-low), TSSOP-14 package compatibility, 5V I/O tolerance, and low-capacitance switching (C_IN = 3.5 pF, C_OFF = 5.0 pF) for signal integrity in DDR and PCIe interconnects.

Technical Context

The PI3C3125LEX implements four independent bilateral analog switches, each controlled by a dedicated /BE_n input. Its CMOS transmission-gate architecture enables bidirectional signal flow (A↔B) with no directionality constraint and zero added ground bounce noise.

It uses a 2.5V or 3.3V single supply, tolerates 5V on all I/O pins, and maintains stable R_ON (5–7 Ω typ.) across V_IN = 0V to 2.4V. The device's fast enable/disable timing (t_PZH/t_PLZ ≤ 6.5 ns) supports dynamic bus reconfiguration in live systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.5V or 3.3V ±10%; enables direct integration with core logic rails without level-shifting.
ON Resistance	5 Ω typical at V_CC = 2.5V; minimizes voltage drop and power loss in high-current digital signal paths.
Bandwidth	>400 MHz; supports clean switching of DDR2/3 clock and strobe signals without edge degradation.
Propagation Delay	0.25 ns typical (A↔B); contributes negligible timing skew in synchronous bus architectures.
I/O Tolerance	5V tolerant on all A/B pins; allows interfacing with legacy 5V peripherals while powered from 2.5V/3.3V rails.
Enable Polarity	Active-low (/BE_n); matches standard 74LVC125 control logic and simplifies FPGA GPIO drive.
Input Capacitance	3.5 pF; reduces loading on driving sources and preserves rise/fall times in high-speed traces.

Pinout & Package

PI3C3125LEX is packaged in a 14-pin TSSOP (L) with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad optional per Diodes' L-package mechanical drawings.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	Single 2.5V/3.3V rail; powers internal logic and switch transistors; must be decoupled locally.
GND	Ground reference	Common return path for all signals and supply current; critical for low-noise switching performance.
A0–A3	Input/Output port A	Bidirectional data terminals; electrically identical to B0–B3; support AC-coupled or DC-coupled signals.
B0–B3	Input/Output port B	Mirror of A0–A3; connected directly to corresponding A_n when /BE_n is asserted low.
/BE0–/BE3	Individual enable inputs	Active-low controls for each switch; allows granular bus partitioning without global reset.

Key Features

Feature	Design Value
Rail-to-rail analog switching	Supports full-swing digital signals (0V to V_CC) without clipping or distortion across 2.5V/3.3V operation.
Hot-insertion capability	Prevents bus contention and glitch generation during live module insertion; eliminates need for external isolation circuitry.
Low OFF-capacitance (5.0 pF)	Minimizes crosstalk and signal coupling between enabled and disabled channels in dense PCB layouts.
5V-tolerant I/O	Enables mixed-voltage system design-e.g., 3.3V SoC communicating with 5V legacy sensors or displays-without external translators.
Industry-standard 74XX125 pinout	Direct drop-in replacement for legacy bus switches; simplifies schematic reuse and layout migration.

Applications

PCIe Gen2 Lane Multiplexing

DDR3 Memory Channel Isolation

Use Scenario: Dynamically rerouting PCIe lanes between two hosts and one endpoint in a modular server backplane.

IC Role / Device Role / Timing Role: Bidirectional lane selector enabling hot-plug reconfiguration without BIOS reset or link renegotiation.

Use Value: Achieves sub-10 ns enable/disable latency and <0.3 ns added jitter, preserving PCIe Gen2 timing margins.

Use Scenario: Isolating DDR3 address/command bus during memory training or dual-controller arbitration in industrial controllers.

IC Role / Device Role / Timing Role: Low-R_ON, low-C_OFF analog switch preventing signal reflection and timing skew on 800 MT/s buses.

Use Value: Maintains signal integrity with <5 Ω resistance and 3.5 pF input capacitance, meeting JEDEC AC timing windows.

USB 2.0 Data Line Switching

FPGA I/O Expansion Hub

Use Scenario: Sharing a single USB 2.0 PHY between two microcontrollers in a failover or dual-boot embedded system.

IC Role / Device Role / Timing Role: High-bandwidth analog switch routing D+/D− differential pairs with minimal insertion loss.

Use Value: Delivers >400 MHz bandwidth and 5V tolerance, supporting full-speed (12 Mbps) and high-speed (480 Mbps) signaling.

Use Scenario: Expanding FPGA GPIO count by time-multiplexing peripheral interfaces (I²C, SPI, UART) across shared pins.

IC Role / Device Role / Timing Role: Individual-enable 4-bit switch allowing per-peripheral isolation and dynamic resource allocation.

Use Value: Enables deterministic switching with 1.5 ns enable delay and no added propagation delay, preserving protocol timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3125DBR	Same 14-pin TSSOP, 5V supply only, 6Ω R_ON, active-low enables, but no 2.5V operation.	Requires 5V rail; unsuitable for 2.5V-core SoCs without level shifters; higher ICC (1 mA vs. 500 µA).	Select when system already uses 5V logic and board space prohibits adding regulators or level shifters.
PI3C3126LEX	Pin-compatible sibling with active-HIGH enables; identical R_ON, bandwidth, and packaging.	Eliminates need for external inverters when driven by FPGA outputs configured as push-pull HIGH-active.	Choose when control logic natively supports active-high enables to reduce gate count and routing complexity.

Compared with SN74CBT3125DBR and PI3C3126LEX, the PI3C3125LEX uniquely supports dual-supply operation (2.5V/3.3V), delivers lower quiescent current (500 µA), and provides native hot-insertion robustness-making it optimal for power-sensitive, mixed-voltage embedded systems requiring field-upgradable modules.

Availability

PI3C3125LEX is available at Aetrix Electronics and suitable for PCIe lane multiplexing, DDR3 memory isolation, and USB 2.0 data switching requiring stable component supply across automotive infotainment, industrial PLCs, and medical imaging subsystems.

Supply support for PI3C3125LEX 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, energy-efficient solutions for power management, signal integrity, and protection.

The PI3C3125LEX belongs to Diodes' Pericom® high-speed analog switch product line, engineered specifically for low-latency, low-distortion signal routing in next-generation computing and communications infrastructure.

FAQ

What is the maximum operating temperature range for PI3C3125LEX?

The PI3C3125LEX is specified for operation from –40°C to +85°C ambient temperature. This range is validated across all electrical parameters including R_ON, propagation delay, and enable timing, ensuring reliable performance in industrial and automotive under-hood environments without derating.

Does PI3C3125LEX require external pull-up resistors on its enable pins?

Yes-a pull-up resistor is recommended on each /BE_n pin for power-up protection, as stated in the datasheet truth table note. Without it, the enables may float during power ramp, causing unintended switch conduction and potential bus contention before firmware initializes control logic.

Can PI3C3125LEX be used with 1.8V logic signals?

No-the PI3C3125LEX requires a minimum V_CC of 2.5V and does not guarantee proper switching or logic threshold behavior below that. For 1.8V systems, Diodes' PI3CHD3125 (1.8V-optimized variant) or level-shifting solutions are required to maintain R_ON stability and VIH/VIL compliance.

Is the PI3C3125LEX pinout compatible with standard 74LVC125 devices?

Yes-the PI3C3125LEX uses the industry-standard 74XX125 pinout (14-pin SOIC/TSSOP), with identical A/B/I/O and enable pin assignments. This allows direct PCB footprint reuse and schematic substitution without layout changes, provided the 2.5V/3.3V supply and 5V I/O tolerance requirements are met.

PI3C3125LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm 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:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

PI3C3125LEX FAQ

1.How can I place an order for PI3C3125LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3C3125LEX 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 PI3C3125LEX reliable?

The price and inventory of PI3C3125LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125LEX is usually 5 days.

3.What payment methods are accepted for PI3C3125LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3C3125LEX?

PI3C3125LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3C3125LEX 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 PI3C3125LEX?

For technical support, including PI3C3125LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125LEX requirements.

6.How does Aetrix verify that PI3C3125LEX is sourced from the original manufacturer or authorized distributors?

All PI3C3125LEX 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 PI3C3125LEX meets industry standards.

7.What is the process for return or replacement of PI3C3125LEX?

All PI3C3125LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125LEX, 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 PI3C3125LEX part is unused and in its original packaging.

Return procedure for PI3C3125LEX:

1.Submit a request within 90 days.

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

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