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

Diodes Incorporated PI3B3125WEX

Name: PI3B3125WEX
Brand: Diodes Incorporated
SKU: PI3B3125WEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3125WEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3125WEX.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,795

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Product details

Overview

PI3B3125WEX from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with individual active-low enables, fabricated in advanced sub-micron CMOS. It features four 5Ω analog switches, near-zero propagation delay (0.25ns), ultra-low quiescent current (0.1µA typical), and operates across –40°C to +85°C. It is used in notebook I/O expansion and low-power peripheral multiplexing where signal integrity and power efficiency are critical.

For engineers reviewing the PI3B3125WEX datasheet, PI3B3125WEX pinout, PI3B3125WEX application, or PI3B3125WEX equivalent, this page delivers verified electrical parameters, SOIC-14 package mapping, truth-table–validated switching behavior, and direct alternatives for 3.3V bus switching in space-constrained portable systems.

Technical Context

The PI3B3125WEX implements four independent bidirectional analog switches controlled by dedicated 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), and introduces zero ground bounce noise during switching.

It supports rail-to-rail logic inputs up to +3.6V independent of V_CC, enabling mixed-voltage interfacing. Power supply sequencing requires V_CC/GND applied before control or data signals to ensure robust hot-plug operation and latch-up immunity.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.3V ±10% - defines nominal operating voltage and compatible I/O swing range
R_ON	5 Ω (typ.) - ensures minimal voltage drop (<240mV at 48mA) and signal attenuation
t_PLH/t_PHL	0.25 ns (typ.) - enables high-speed digital bus routing without timing budget penalty
I_CC	0.1 µA (typ.) - allows permanent enablement in battery-powered systems without measurable drain
Input Voltage Range	–0.5V to +4.6V - supports overvoltage-tolerant control inputs and mixed-supply logic interfacing
Operating Temperature	–40°C to +85°C - qualified for industrial and portable computing environments
C_OFF	8 pF - limits crosstalk and capacitive loading when switch is disabled

Pinout & Package

PI3B3125WEX is housed in a 14-pin SOIC (W) package (150mil width), RoHS-compliant and halogen-free per Diodes' Green standard.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	A0–A3	Input/output port A side - bidirectionally connected to Bn when corresponding BE is asserted
5, 6, 7, 8	B0–B3	Input/output port B side - electrically continuous with An under active enable
9	GND	Ground reference - required for logic threshold definition and thermal dissipation
10–13	BE0–BE3	Active-low bus enable controls - each independently gates one A–B channel
14	V_CC	3.3V power supply - powers internal logic and switch transistors; must be stable before signal application

Key Features

Feature	Design Value
Near-zero propagation delay	0.25ns typical - preserves signal edge fidelity in high-speed parallel buses
5Ω on-resistance	Ensures <240mV voltage drop at 48mA - maintains logic-level margins across full load range
Individual active-low enables	Per-channel BE0–BE3 control enables selective routing without global reset or reconfiguration
Ultra-low quiescent current	0.1µA typical - eliminates standby power concerns in always-on I/O subsystems
Rail-to-rail input tolerance	Supports 0V–3.6V logic drive regardless of V_CC - simplifies interface with diverse voltage-domain controllers

Applications

Notebook I/O Expansion

USB Peripheral Multiplexing

Use Scenario: Routing multiple low-speed serial interfaces (SMBus, LPC, GPIO) between chipset and add-in modules in thin-and-light notebooks.

IC Role / Device Role / Timing Role: Bidirectional analog bus switch providing isolated, low-capacitance signal paths with no added timing skew.

Use Value: Enables dynamic sharing of limited chipset pins while maintaining signal integrity and minimizing PCB layer count.

Use Scenario: Selecting between two USB host controllers to drive a single downstream port in docking stations.

IC Role / Device Role / Timing Role: Low-R_ON, fast-enable switch ensuring transparent D+/D− signal pass-through without protocol violation.

Use Value: Eliminates need for complex USB-aware multiplexers; supports full-speed (12Mbps) signaling with <1ns jitter impact.

Low-Power Sensor Hub Interface

Embedded Controller Debug Port Sharing

Use Scenario: Connecting multiple I²C sensors (accelerometer, ambient light, temperature) to a shared sensor hub microcontroller.

IC Role / Device Role / Timing Role: Individual BE-controlled switch isolating sensors during sleep mode to reduce system leakage.

Use Value: Reduces total hub I²C bus capacitance by >60% when unused sensors are disconnected, improving rise time and noise margin.

Use Scenario: Sharing a single SWD/JTAG debug port among multiple MCUs on an industrial control board.

IC Role / Device Role / Timing Role: Bidirectional switch enabling debug access to any MCU without physical rework or manual jumpering.

Use Value: Supports field firmware updates and diagnostics without requiring dedicated debug headers per MCU, saving board space and BOM cost.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3.3V bus switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PI3B3126WEX	Identical switch architecture but with active-HIGH enables (BE0–BE3)	Requires inverted enable logic; unsuitable where existing design uses active-LOW gating	Select when controller outputs active-HIGH enables or when redesigning enable logic to simplify glue logic
SN74CBT3125PW	Same 14-pin TSSOP footprint, 5Ω R_ON, but 5V-tolerant inputs and higher ICC (10µA typ.)	Supports mixed 3.3V/5V systems but consumes 100× more quiescent current	Choose only if 5V input compatibility is mandatory and ultra-low standby power is not required

Compared with PI3B3126WEX, the PI3B3125WEX saves PCB-level level-shifting for active-LOW control; versus SN74CBT3125PW, it reduces standby current by two orders of magnitude-critical for battery-backed I/O hubs and always-on sensor nodes.

Availability

PI3B3125WEX is available at Aetrix Electronics and suitable for notebook I/O expansion, USB peripheral multiplexing, low-power sensor hub interface, and embedded controller debug port sharing requiring stable component supply and lead-free compliance.

Supply support for PI3B3125WEX 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, industrial, and automotive markets.

The PI3B series targets high-speed, low-power logic switching applications-specifically engineered for portable computing and embedded systems demanding minimal propagation delay, ultra-low standby current, and robust mixed-voltage interoperability.

FAQ

What is the maximum signal frequency supported by PI3B3125WEX?

The PI3B3125WEX does not specify a maximum clock frequency, as it is an analog bus switch-not a clocked logic device. Its 5Ω R_ON and 8pF C_OFF support full-speed USB (12Mbps), SMBus (100kHz), and LPC (33MHz) signals with negligible distortion. Signal integrity is governed by external RC loading, not internal bandwidth limits.

Can PI3B3125WEX be used with 5V logic inputs?

No-PI3B3125WEX logic inputs (BE0–BE3) tolerate up to +3.6V, not 5V. Applying 5V violates the absolute maximum rating of –0.5V to +4.6V and risks permanent damage. For 5V-tolerant operation, consider SN74CBT3125PW or PI3B3245QEX, both rated to 5.5V.

Is PI3B3125WEX pin-compatible with standard 74-series logic devices?

Yes-PI3B3125WEX uses the industry-standard 74XX125/126 pinout. Pin 1–4 = A0–A3, Pins 5–8 = B0–B3, Pins 10–13 = BE0–BE3, Pin 9 = GND, Pin 14 = V_CC. This allows drop-in replacement of obsolete 74LVC125 or 74ALVC125 in 3.3V systems where low R_ON and ultra-low I_CC are needed.

Does PI3B3125WEX require external pull-up resistors on BE pins?

Yes-a pull-up resistor (typically 10kΩ to V_CC) is recommended on each BE pin for power-up protection. Without it, BE pins float during power ramp, causing undefined switch states that may induce bus contention or excessive current draw until logic stabilizes.

PI3B3125WEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm 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:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

PI3B3125WEX FAQ

1.How can I place an order for PI3B3125WEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3125WEX 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 PI3B3125WEX reliable?

The price and inventory of PI3B3125WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3125WEX is usually 5 days.

3.What payment methods are accepted for PI3B3125WEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3125WEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3125WEX?

PI3B3125WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3125WEX 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 PI3B3125WEX?

For technical support, including PI3B3125WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3125WEX requirements.

6.How does Aetrix verify that PI3B3125WEX is sourced from the original manufacturer or authorized distributors?

All PI3B3125WEX 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 PI3B3125WEX meets industry standards.

7.What is the process for return or replacement of PI3B3125WEX?

All PI3B3125WEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3125WEX, 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 PI3B3125WEX part is unused and in its original packaging.

Return procedure for PI3B3125WEX:

1.Submit a request within 90 days.

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

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