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

Diodes Incorporated PI3C3125Q

Name: PI3C3125Q
Brand: Diodes Incorporated
SKU: PI3C3125Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3C3125Q

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3C3125Q.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,428

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Product details

Overview

PI3C3125Q from Diodes Incorporated is a 2.5V/3.3V, 4-bit, 2-port bus switch with four individually controllable low-impedance (5Ω) analog switches, active-low enables, and 400MHz+ bandwidth-designed for high-speed data routing in hot-insertion-capable systems such as PCIe add-in cards and modular backplanes.

For engineers reviewing the PI3C3125Q datasheet, PI3C3125Q pinout, PI3C3125Q application, or PI3C3125Q equivalent, this device is selected for its near-zero propagation delay (0.25ns), rail-to-rail signal switching, 5V I/O tolerance, and QSOP-16 packaging enabling compact board layout in space-constrained hot-swap interfaces.

Technical Context

The PI3C3125Q implements four independent bilateral analog switches, each controlled by an active-low Bus Enable (BE_n) input. When enabled, the A_n–B_n path conducts with 5Ω typical ON resistance and <10pF ON capacitance, preserving signal integrity up to 400MHz.

It operates from a single 2.5V or 3.3V supply, supports hot insertion via high-impedance disable state (±1µA leakage), and tolerates 5V signals on all I/O pins regardless of V_CC level-enabling interoperability between mixed-voltage domains without level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.5V or 3.3V ±10% - supports dual-voltage system integration without external regulators
ON Resistance	5Ω typ. - minimizes voltage drop and power loss in high-current digital/data paths
Bandwidth	>400MHz - enables clean switching of DDR, USB 2.0, and PCIe Gen1 signals
I/O Tolerance	5V - allows connection to legacy 5V logic without clamping diodes or level translators
Propagation Delay	0.25ns typ. - contributes negligible timing skew in synchronous parallel bus architectures
Enable Polarity	Active LOW - matches standard 74-series bus driver control logic for drop-in replacement
Quiescent Current	260µA max. - reduces standby power in always-on hot-swap controller subsystems

Pinout & Package

PI3C3125Q is housed in a 16-pin QSOP (150-mil wide) package with 0.635mm pitch, optimized for thermal dissipation and reflow compatibility in industrial PCB assemblies.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Power Supply Input	Single 2.5V/3.3V supply for internal logic and switch biasing
GND	Ground Reference	Common return path for all I/O and internal circuitry
A0–A3	Input/Source Terminal	One side of each 4-bit bidirectional switch; accepts 5V-tolerant signals
B0–B3	Output/Drain Terminal	Other side of each switch; electrically identical to A pins when enabled
BE0–BE3	Enable Control Input	Active-LOW per-switch enable; drives corresponding A_n–B_n path into high-Z when HIGH
NC (Pins 15–16)	No Connect	Unbonded die pads; must remain unconnected per datasheet

Key Features

Feature	Design Value
Rail-to-rail analog switching	Supports full 0V–V_CC signal swing without distortion or clipping
Hot-insertion capability	High-impedance disable state prevents backdrive and bus contention during live module insertion
Individual per-channel enables	Enables selective routing of subsets of a 4-bit bus without affecting other lanes
Low capacitive loading	10pF ON capacitance and 5pF OFF capacitance minimize signal reflection and crosstalk
Industry-standard pinout	74XX125-compatible layout simplifies PCB redesign and footprint reuse

Applications

PCIe Add-in Card Switching

Modular Backplane Interconnect

Use Scenario: Routing configuration and status signals between host CPU and hot-pluggable PCIe expansion modules.

IC Role / Device Role / Timing Role: Bidirectional bus switch isolating control lines (PERST#, CLKREQ#, WAKE#) during insertion/removal.

Use Value: Prevents ground bounce and bus contention while maintaining sub-nanosecond timing alignment across 4 control lines.

Use Scenario: Enabling/disabling data lanes between redundant processor blades and shared I/O fabric in telecom chassis.

IC Role / Device Role / Timing Role: Per-lane signal gating element in fault-tolerant backplane architecture with automatic failover.

Use Value: Allows dynamic lane reconfiguration without interrupting adjacent active links due to 5Ω low-impedance path and 400MHz bandwidth.

USB 2.0 Hub Port Switching

DDR Memory Subsystem Isolation

Use Scenario: Selectively connecting USB 2.0 D+/D− pairs from upstream controller to downstream ports in multi-port hubs.

IC Role / Device Role / Timing Role: High-bandwidth analog switch managing differential signaling with minimal jitter addition.

Use Value: Maintains USB 2.0 eye diagram integrity (480Mbps) via 5Ω R_ON and <10pF C_ON, avoiding signal degradation from series resistance or parasitic capacitance.

Use Scenario: Isolating DDR address/command buses between memory controller and DIMM slots during power-down sequences.

IC Role / Device Role / Timing Role: Low-latency gate controlling A/C/CKE signals to prevent leakage current and timing violations during self-refresh.

Use Value: Enables precise per-DIMM power gating with 0.25ns propagation delay, preserving t_MRD and t_MOD timing margins.

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
SN74CBT3125DBR	5V-only supply; no 2.5V operation; 6Ω R_ON; same 14-pin TSSOP package	Lacks hot-insertion support due to higher leakage in disable state (±10µA vs. ±1µA)	Select when operating exclusively at 5V and cost sensitivity outweighs low-leakage requirement
PI3C3126QEX	Identical specs except active-HIGH enables; shares same QSOP-16 footprint and pinout	Requires inverted enable logic in FPGA/CPLD control firmware	Choose when system-level enable signals are active-HIGH and PCB layout reuse is prioritized

Compared with SN74CBT3125DBR and PI3C3126QEX, the PI3C3125Q uniquely combines 2.5V/3.3V dual-supply operation, ultra-low disable leakage, and active-LOW enables in QSOP-16-making it optimal for low-power hot-swap controllers where supply flexibility and signal integrity are critical.

Availability

PI3C3125Q is available at Aetrix Electronics and suitable for PCIe add-in card design, modular telecom backplanes, USB 2.0 hub development, and DDR memory subsystem isolation requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for PI3C3125Q 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and product qualification to AEC-Q100/101 standards.

The PI3C3125Q belongs to Diodes' Pericom® high-speed interface portfolio, engineered specifically for low-latency, hot-pluggable data routing in computing, communications, and industrial systems demanding robust signal integrity and mixed-voltage interoperability.

FAQ

What is the maximum signal frequency supported by PI3C3125Q?

The PI3C3125Q supports signals up to >400MHz, verified by bandwidth testing under 50Ω termination and 50pF load conditions. Its 5Ω ON resistance and 10pF ON capacitance yield an RC time constant well below 0.5ns, ensuring minimal rise-time degradation for DDR2, USB 2.0, and PCIe Gen1 waveforms without equalization.

Can PI3C3125Q operate with a 2.5V supply while interfacing with 5V logic?

Yes. The PI3C3125Q's I/O pins are 5V-tolerant regardless of V_CC level. With V_CC = 2.5V, it safely accepts and switches 0–5V input signals while maintaining correct logic thresholds and output drive strength-enabling direct connection between 2.5V controllers and 5V peripherals without external level shifters.

How does the PI3C3125Q handle hot insertion events?

During hot insertion, the PI3C3125Q remains in high-impedance disable state (BE_n = HIGH) until system firmware asserts enable signals. Its ±1µA leakage current in disable mode prevents backdrive, bus contention, or latch-up-meeting JEDEC JESD78 requirements for hot-plug reliability in modular systems.

Is the QSOP-16 package of PI3C3125Q RoHS and halogen-free compliant?

Yes. The PI3C3125Q is fully RoHS 3 (2015/863/EU) compliant with no intentionally added lead, and meets Diodes' "Green" definition: <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony compounds-verified through material declarations and third-party lab testing per IEC 62321.

PI3C3125Q 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

PI3C3125Q FAQ

1.How can I place an order for PI3C3125Q through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3C3125Q 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 PI3C3125Q reliable?

The price and inventory of PI3C3125Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125Q is usually 5 days.

3.What payment methods are accepted for PI3C3125Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3C3125Q?

PI3C3125Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3C3125Q 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 PI3C3125Q?

For technical support, including PI3C3125Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125Q requirements.

6.How does Aetrix verify that PI3C3125Q is sourced from the original manufacturer or authorized distributors?

All PI3C3125Q 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 PI3C3125Q meets industry standards.

7.What is the process for return or replacement of PI3C3125Q?

All PI3C3125Q units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125Q, 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 PI3C3125Q part is unused and in its original packaging.

Return procedure for PI3C3125Q:

1.Submit a request within 90 days.

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

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