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

Diodes Incorporated PI3B3125WE

Name: PI3B3125WE
Brand: Diodes Incorporated
SKU: PI3B3125WE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3125WE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3125WE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,002

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Product details

Overview

PI3B3125WE from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with four individually enabled 5Ω analog switches in SOIC-14 package. It provides near-zero propagation delay (0.25ns), ultra-low quiescent current (0.1µA typical), and rail-to-rail logic compatibility up to +3.6V. Used for high-speed signal routing in notebook I/O expansion and low-power peripheral switching.

For engineers reviewing the PI3B3125WE datasheet, PI3B3125WE pinout, PI3B3125WE application, or PI3B3125WE equivalent, key selection criteria include active-low enable logic, 5Ω on-resistance at 3.3V, 4ns max switching speed, and SOIC-14 footprint compatibility with 74xx125/126 layouts.

Technical Context

The PI3B3125WE implements four independent bidirectional analog switches controlled by active-low Bus Enable (BE0–BE3) inputs. Each switch connects A_n to B_n with no added propagation delay beyond RC time constant (≈0.25ns for 50pF load).

It operates over –40°C to +85°C at V_CC = 3.3V ±10%, supports hot-plug-safe power sequencing, and tolerates input voltages up to +3.6V regardless of supply level - enabling mixed-voltage interface bridging without level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.3V ±10% - matches standard low-voltage I/O rails in portable computing and embedded systems
R_ON	5Ω typical - enables minimal voltage drop (<240mV at 48mA) and preserves signal integrity across switched paths
t_PLH/t_PHL	0.25ns max - contributes negligible delay in high-speed data paths such as USB 2.0 or LPC bus extensions
I_CC	0.1µA typical - reduces standby power in always-on subsystems like keyboard controllers or sensor hubs
Input Voltage Range	–0.5V to +4.6V - allows direct interfacing with 1.8V, 2.5V, and 3.3V logic without external biasing
Switch Off Capacitance	8pF - limits crosstalk and maintains signal isolation between enabled/disabled channels
Enable Propagation Delay	1.0–3.0ns - ensures fast channel activation/deactivation for dynamic bus arbitration

Pinout & Package

PI3B3125WE is supplied in a 14-pin SOIC (W) package (150mil width), pin-compatible with industry-standard 74xx125/126 logic layouts and suitable for automated SMT assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	A0–A3	Input/output terminals for port A; bidirectional analog signal path when associated BE is asserted
5, 6, 7, 8	BE0–BE3	Active-low enable controls per switch; pulled high via external resistor for power-up safety
9–12	B0–B3	Input/output terminals for port B; electrically identical to A_n, forming mirrored 4-bit bus pair
13	V_CC	3.3V supply input; decoupling capacitor required within 1cm for stable switching performance
14	GND	Ground reference for all analog and digital functions; must be connected to low-impedance system ground plane

Key Features

Feature	Design Value
Near-zero propagation delay	0.25ns max - eliminates timing budget impact in synchronous peripheral interfaces
5Ω on-resistance	Ensures <240mV voltage drop at 48mA - preserves logic thresholds and analog signal fidelity
Ultra-low quiescent current	0.1µA typical - extends battery life in always-on I/O monitoring circuits
Rail-to-rail input tolerance	Supports 0V to +3.6V inputs at 3.3V V_CC - simplifies mixed-voltage board design without level translators
Individual per-channel enables	Enables selective bus partitioning - critical for dynamic resource allocation in multi-peripheral systems

Applications

Notebook I/O Expansion

LPC Bus Switching

Use Scenario: Routing USB, SMBus, or GPIO signals between chipset and docking station connectors in ultrabooks.

IC Role / Device Role / Timing Role: Bidirectional analog switch providing isolated, low-latency signal pass-through under firmware control.

Use Value: Enables hot-pluggable accessory support with <0.25ns added delay and no ground bounce noise generation.

Use Scenario: Dynamically connecting multiple LPC peripherals (TPM, EC, Super I/O) to shared host controller lanes.

IC Role / Device Role / Timing Role: Channel-selectable bus switch allowing time-multiplexed access to legacy low-pin-count resources.

Use Value: Reduces PCB layer count by eliminating dedicated traces per peripheral while maintaining full 33MHz LPC timing compliance.

Low-Power Sensor Hub Interface

Embedded Controller Signal Multiplexing

Use Scenario: Interfacing multiple I²C sensors (accelerometer, ambient light, temperature) to a single MCU I²C port in wearables.

IC Role / Device Role / Timing Role: Low-leakage, low-R_ON analog switch enabling software-configurable sensor selection without bus contention.

Use Value: Achieves 0.1µA standby current and 5Ω R_ON to preserve I²C rise times and avoid signal degradation across 100kΩ pull-ups.

Use Scenario: Sharing debug, reset, and status lines between main CPU and embedded controller in server motherboards.

IC Role / Device Role / Timing Role: Fast-enable bus switch supporting asynchronous handshaking and fault-isolation between domains.

Use Value: Provides 1.0ns enable time and 4ns max switching to meet sub-10ns timing windows in platform management protocols.

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
PI3B3126WE	Active-HIGH enable logic vs. PI3B3125WE's active-LOW; otherwise identical electrical specs and pinout	Requires inverted enable signal generation; unsuitable where existing firmware drives active-low enables directly	Select only if system-level control logic natively sources HIGH enables or uses inverters
SN74CBT3125DBR	Higher R_ON (7Ω typ), higher ICC (10µA), same 14-TSSOP package; TI part with different thermal resistance	Marginally higher insertion loss and power draw; not drop-in due to different enable polarity and slightly slower disable time (4.5ns vs. 4.0ns)	Acceptable for non-critical timing applications where 2Ω R_ON increase and 9.9µA extra quiescent current are tolerable

Compared with PI3B3126WE and SN74CBT3125DBR, PI3B3125WE delivers the lowest on-resistance and quiescent current in its class, making it optimal for battery-sensitive, high-fidelity signal routing where active-low enable control is available.

Availability

PI3B3125WE is available at Aetrix Electronics and suitable for notebook I/O expansion, LPC bus switching, and low-power sensor hub interface applications requiring stable component supply and long-term industrial availability.

Supply support for PI3B3125WE 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 ICs, specializing in high-performance, energy-efficient solutions for consumer, computing, industrial, and automotive markets.

The PI3B series targets high-speed, low-power logic switching applications - specifically engineered for portable computing and embedded systems needing rail-to-rail compatibility, near-zero delay, and ultra-low standby current.

FAQ

What is the maximum signal voltage that can be passed through PI3B3125WE?

The PI3B3125WE supports analog signal voltages from –0.5V to V_CC + 0.3V (i.e., up to +3.6V at 3.3V supply). This rail-to-rail capability allows safe transmission of 1.8V, 2.5V, and 3.3V logic levels without clamping or distortion, provided V_CC remains within absolute maximum ratings.

Does PI3B3125WE require external pull-up resistors on the BE pins?

Yes - a pull-up resistor (typically 10kΩ) is required on each BE pin to ensure defined HIGH state during power-up. Without it, the switch remains disabled until firmware asserts the enable, risking undefined behavior in systems where default isolation is critical for safety or initialization sequence integrity.

Can PI3B3125WE be used in hot-swap applications?

Yes - its power-supply sequencing tolerance (V_CC/GND applied before signals) and input overvoltage capability (+3.6V max) make it suitable for hot-swap I/O ports. However, external series resistors (10–33Ω) on A/B lines are recommended to limit inrush current and prevent glitch-induced false enables during connector mating.

How does PI3B3125WE handle ground bounce during switching?

The PI3B3125WE introduces no additional ground bounce noise because its CMOS transmission gate architecture avoids shoot-through current and features tightly matched P/N device sizing. Measured ground bounce is below 10mV peak under 50pF/500Ω test conditions - effectively transparent to sensitive analog or clock domains sharing the same ground plane.

PI3B3125WE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

PI3B3125WE FAQ

1.How can I place an order for PI3B3125WE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3125WE 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 PI3B3125WE reliable?

The price and inventory of PI3B3125WE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3125WE is usually 5 days.

3.What payment methods are accepted for PI3B3125WE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3125WE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3125WE?

PI3B3125WE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3125WE 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 PI3B3125WE?

For technical support, including PI3B3125WE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3125WE requirements.

6.How does Aetrix verify that PI3B3125WE is sourced from the original manufacturer or authorized distributors?

All PI3B3125WE 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 PI3B3125WE meets industry standards.

7.What is the process for return or replacement of PI3B3125WE?

All PI3B3125WE units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3125WE, 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 PI3B3125WE part is unused and in its original packaging.

Return procedure for PI3B3125WE:

1.Submit a request within 90 days.

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

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