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

Diodes Incorporated PI3B3125LE

Name: PI3B3125LE
Brand: Diodes Incorporated
SKU: PI3B3125LE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3125LE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3125LE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,252

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Product details

Overview

PI3B3125LE from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with individual active-low enables, fabricated in sub-micron CMOS. It integrates four 5Ω analog switches, delivers near-zero propagation delay (0.25ns), and draws only 0.1µA quiescent current-ideal for low-power notebook I/O routing and hot-swap signal isolation.

For engineers reviewing the PI3B3125LE datasheet, PI3B3125LE pinout, PI3B3125LE application, or PI3B3125LE equivalent, key selection criteria include its 14-pin TSSOP package, active-low BE control logic, 5Ω R_ON, 4ns max switching speed, and rail-to-rail input compatibility up to +3.6V independent of V_CC.

Technical Context

The PI3B3125LE implements a passive analog switch architecture-no internal logic or level-shifting-where each A_n–B_n path is directly connected via a MOSFET-based transmission gate when its corresponding BE_n is asserted low. Propagation delay arises solely from RC time constant (RON × C_LOAD), not internal logic stages.

It supports hot-plug operation with power-supply sequencing guidance (V_CC/GND before signals) and features rail-to-rail input tolerance: control inputs accept 0V to +3.6V regardless of 3.3V supply, minimizing interface-level translation overhead in mixed-voltage systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.3V ±10% - fixed single-rail operation; no dual-supply or level-shifting required
R_ON	5Ω typical - enables low-loss signal pass-through for high-speed digital or analog buses
t_PLH/t_PHL	0.25ns max - negligible added delay; preserves signal integrity in timing-critical paths
I_CC	0.1µA typical - allows permanent enablement in battery-backed or always-on subsystems
Input Voltage Range	–0.5V to +4.6V - supports overvoltage-tolerant control signaling and mixed-voltage interfacing
Switch Off Capacitance	8pF - minimizes crosstalk and loading on adjacent traces in dense PCB layouts

Pinout & Package

PI3B3125LE is housed in a 14-pin TSSOP (173mil wide) package with exposed pad thermal performance suitable for space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
1, 14	V_CC, GND	Power and ground rails; decoupling capacitor placement critical for noise suppression
A0–A3	Input Bus Terminals	Source-side signal nodes; bidirectional but driven from A side in standard bus topology
B0–B3	Output Bus Terminals	Sink-side signal nodes; electrically identical to A pins when switch enabled
BE0–BE3	Active-Low Enables	Independent per-channel control; low = conductive path; high = 10µA off-state leakage

Key Features

Feature	Design Value
Near-zero propagation delay	0.25ns max ensures no timing budget penalty when inserted into high-speed data paths
5Ω analog switch R_ON	Preserves signal amplitude and edge rate for 3.3V LVTTL, LVCMOS, and low-swing differential interfaces
Ultra-low quiescent current	0.1µA typical enables permanent enablement without measurable battery drain in portable systems
Rail-to-rail input tolerance	Supports 0V–3.6V logic drive independent of 3.3V V_CC, eliminating need for external level shifters
Individual per-channel enables	Enables dynamic bandwidth allocation-e.g., enabling only active USB data lanes while isolating idle ones

Applications

USB 2.0 Data Switching

Notebook I/O Multiplexing

Use Scenario: Routing USB D+/D− signals between two host controllers and one downstream port in dual-mode docking stations.

IC Role / Device Role / Timing Role: Bidirectional analog switch providing transparent signal pass-through with <0.3ns added delay and no DC offset.

Use Value: Eliminates need for active USB repeaters or retimers, reducing BOM cost and power by >15mW per channel.

Use Scenario: Isolating keyboard, touchpad, and SD card signals during sleep/wake transitions in ultrabooks.

IC Role / Device Role / Timing Role: Low-leakage bus switch enabling selective power gating of peripheral interfaces without signal corruption.

Use Value: Reduces system standby current by blocking leakage paths through unpowered peripherals, extending battery life by ~8%.

Hot-Plug PCIe Lane Sharing

Legacy Interface Isolation

Use Scenario: Sharing PCIe x1 lanes between NVMe SSD and eGPU in compact form-factor workstations.

IC Role / Device Role / Timing Role: High-fidelity analog switch preserving PCIe Gen2 eye diagram integrity at 2.5Gbps.

Use Value: Enables mechanical lane reconfiguration without firmware intervention or PHY retraining delays.

Use Scenario: Isolating legacy LPC or SMbus signals from main SoC during firmware update to prevent bus contention.

IC Role / Device Role / Timing Role: Fail-safe signal gate with 10µA off-state leakage and <1ns disable time.

Use Value: Prevents unintended writes or resets during secure boot sequences, improving firmware update reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PI3B3126LE	Active-HIGH enables (vs. active-LOW on PI3B3125LE); identical R_ON, timing, and package	Requires inverted enable logic from MCU/FPGA; eliminates external inverters in active-high control architectures	Select when system control logic natively drives high-enable signals to reduce component count
SN74CBT3125CPWR	Higher R_ON (7Ω typ), higher ICC (5µA), same 14-TSSOP package; TI part with different thermal specs	Marginally higher insertion loss and power draw; compatible pinout but requires validation of thermal derating at 85°C	Use only if existing design uses TI's CBT family and qualification reuse is prioritized over lowest R_ON

Compared with PI3B3126LE, PI3B3125LE simplifies enable logic in systems with open-drain or pull-up-biased controls; versus SN74CBT3125CPWR, it delivers lower on-resistance and 50× less quiescent current-critical for battery-sensitive applications.

Availability

PI3B3125LE is available at Aetrix Electronics and suitable for notebook I/O routing, USB 2.0 signal switching, and hot-plug PCIe lane sharing requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for PI3B3125LE 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 consumer, computing, industrial, and automotive markets.

The PI3B series targets low-latency, low-power bus switching in portable and embedded systems-designed specifically for applications demanding minimal propagation delay, ultra-low standby current, and robust mixed-voltage interoperability.

FAQ

What is the maximum signal frequency supported by PI3B3125LE?

The PI3B3125LE does not specify a hard frequency limit, as it functions as a passive analog switch. Its 5Ω R_ON and 8pF off-capacitance yield an RC bandwidth exceeding 4GHz. Real-world usable frequency depends on load capacitance and driving source impedance-verified up to 2.5Gbps (PCIe Gen2) with proper layout and termination.

Can PI3B3125LE be used with 1.8V or 2.5V logic levels?

Yes. The PI3B3125LE's analog switch core operates transparently across 0V–3.3V signal swings. Its control inputs tolerate 0V–3.6V regardless of V_CC, so 1.8V or 2.5V logic can directly drive BE pins when V_CC = 3.3V-no level shifter needed for enable signals.

Is there a risk of latch-up when using PI3B3125LE with mismatched voltage domains?

No. The PI3B3125LE uses a CMOS transmission-gate structure with built-in ESD protection diodes rated for –0.5V to +4.6V. As long as V_CC is powered and within specification, and no pin exceeds absolute maximum ratings, latch-up is prevented by process-level design and verified per JEDEC JESD78.

Does PI3B3125LE require external pull-up or pull-down resistors on BE pins?

Yes-a pull-up resistor is recommended on each BE pin for power-up safety. With BE floating at power-on, the switch defaults to high-impedance state (disconnected), but a pull-up ensures deterministic disable until firmware asserts control. Diodes recommends 10kΩ to V_CC per BE pin.

PI3B3125LE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tube

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:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

PI3B3125LE FAQ

1.How can I place an order for PI3B3125LE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3125LE 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 PI3B3125LE reliable?

The price and inventory of PI3B3125LE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3125LE is usually 5 days.

3.What payment methods are accepted for PI3B3125LE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3125LE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3125LE?

PI3B3125LE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3125LE 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 PI3B3125LE?

For technical support, including PI3B3125LE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3125LE requirements.

6.How does Aetrix verify that PI3B3125LE is sourced from the original manufacturer or authorized distributors?

All PI3B3125LE 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 PI3B3125LE meets industry standards.

7.What is the process for return or replacement of PI3B3125LE?

All PI3B3125LE units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3125LE, 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 PI3B3125LE part is unused and in its original packaging.

Return procedure for PI3B3125LE:

1.Submit a request within 90 days.

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

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