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

Diodes Incorporated PI3B3125QE

Name: PI3B3125QE
Brand: Diodes Incorporated
SKU: PI3B3125QE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3125QE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3125QE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,044

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Product details

Overview

PI3B3125QE 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 signal routing where rail-to-rail logic compatibility and minimal ground bounce are critical.

For engineers reviewing the PI3B3125QE datasheet, PI3B3125QE pinout, PI3B3125QE application, or PI3B3125QE equivalent, this page delivers verified electrical parameters, QSOP-16 package mapping, truth-table–validated switching behavior, and direct alternatives for 3.3V bus isolation and dynamic signal path control in portable and embedded systems.

Technical Context

The PI3B3125QE implements four independent bidirectional analog switches, each controlled by a dedicated active-low Bus Enable (BE) input. 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 regardless of V_CC = 3.3V ±10%, enabling interoperability with mixed-voltage systems. Its 5Ω on-resistance and 8pF off-capacitance ensure minimal signal distortion and fast enable/disable timing (t_PZH/t_PHZ ≤ 3.0/4.0ns).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	3.3V ±10% - Ensures stable operation under typical notebook power rail tolerances
R_ON	5Ω (typ.) - Enables low-loss signal pass-through for 3.3V digital buses up to 120mA
t_PLH/t_PHL	0.25ns (max.) - Delivers near-transparent signal routing without timing skew
I_CC	0.1µA (typ.) - Supports always-on I/O isolation in battery-powered sleep states
C_OFF	8pF - Minimizes crosstalk and capacitive loading when switches are disabled
Input Voltage Range	–0.5V to +4.6V - Allows safe interfacing with 3.3V, 2.5V, and 1.8V logic families
Operating Temp	–40°C to +85°C - Qualified for industrial and extended-temperature portable applications

Pinout & Package

PI3B3125QE is housed in a 16-pin QSOP (Q) package (150mil wide), RoHS-compliant and halogen-free. Pin 1 is V_CC, pin 9 is GND; pins 2–8 and 10–16 form dual-port A/B and BE control signals.

Pin/Terminal	Circuit Role	Design Meaning
1	V_CC	3.3V supply input - Must be powered before applying any logic or signal inputs
2–5, 10–13	A3–A0, B3–B0	Bidirectional data ports - A_n and B_n are electrically identical; no directionality required
6–8, 14–16	BE3–BE0	Active-low enable controls - Low = conductive path between corresponding A_n and B_n
9	GND	Ground reference - Shared return for power and signal integrity; must be low-impedance

Key Features

Feature	Design Value
Near-zero propagation delay	0.25ns max - Eliminates timing budget impact in high-speed bus multiplexing
5Ω analog switch R_ON	Ensures <1% voltage drop at 120mA - Preserves signal integrity for 3.3V LVTTL/LVCMOS
Ultra-low quiescent current	0.1µA typical - Enables permanent connection in always-on subsystems without battery drain
Rail-to-rail input tolerance	Supports –0.5V to +4.6V - Simplifies level-shifting in mixed-voltage I/O domains
Zero ground bounce	No additional noise injected into shared GND - Critical for noise-sensitive audio or RF co-location

Applications

USB 2.0 Data Multiplexing

Notebook Display Interface Routing

Use Scenario: Dynamic selection between two USB 2.0 upstream ports sharing one downstream controller.

IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling differential D+/D− paths without signal inversion or delay.

Use Value: Maintains full 480Mbps signaling integrity with <0.25ns added delay and <5Ω path resistance.

Use Scenario: Isolating eDP/LVDS display lanes during panel hot-swap or dual-display arbitration.

IC Role / Device Role / Timing Role: Low-capacitance (8pF OFF), low-R_ON switch for high-speed video data lanes.

Use Value: Prevents crosstalk and ensures clean edge transitions across 1.6Gbps display links.

Low-Power I/O Expansion Hub

Embedded Controller Debug Port Sharing

Use Scenario: Adding GPIO or UART lines to space-constrained MCU designs via shared PCB traces.

IC Role / Device Role / Timing Role: Four independent 3.3V signal gates controlled by dedicated enables for flexible routing.

Use Value: Reduces board layer count while maintaining 0.1µA standby current for energy-efficient design.

Use Scenario: Sharing JTAG/SWD debug interface among multiple SoCs on a single carrier board.

IC Role / Device Role / Timing Role: Bidirectional, low-noise switch enabling safe, non-invasive debug access arbitration.

Use Value: Eliminates need for mechanical jumpers or external level shifters; supports hot-plug sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3125PWR	5V-tolerant inputs; higher R_ON (7Ω typ.); 14-TSSOP only	Requires 5V-compatible logic drivers; not suitable for strict 3.3V-only systems	Select if system uses mixed 3.3V/5V logic and TSSOP footprint is preferred
74LVC1G3157GW	Single-channel; lower drive capability (64mA); 6-pin SC-70 package	Limited to point-to-point switching; insufficient for 4-bit parallel routing	Choose only for ultra-small-footprint single-signal isolation, not multi-bit bus use

Compared with SN74CBT3125PWR and 74LVC1G3157GW, PI3B3125QE uniquely combines quad-channel 3.3V operation, 5Ω R_ON, 0.25ns delay, and QSOP-16 packaging-making it optimal for compact, low-power, high-fidelity 4-bit bus routing in portable electronics.

Availability

PI3B3125QE is available at Aetrix Electronics and suitable for notebook I/O expansion, embedded display interface routing, low-power GPIO multiplexing, and debug port sharing requiring stable component supply across production lifecycles.

Supply support for PI3B3125QE 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 high-speed, low-power logic switching applications-specifically engineered for portable electronics where minimal propagation delay, ultra-low standby current, and rail-to-rail interoperability are essential.

FAQ

What is the maximum signal frequency supported by PI3B3125QE?

The PI3B3125QE does not specify a hard frequency limit but supports full-speed USB 2.0 (480Mbps) and eDP 1.4 (1.6Gbps per lane) due to its 0.25ns propagation delay and 5Ω R_ON. Signal integrity depends on trace layout and load capacitance; for 50pF loads, rise/fall times remain unaffected by the switch itself.

Can PI3B3125QE operate with V_CC = 2.5V?

No. PI3B3125QE is specified only for V_CC = 3.3V ±10% (2.97V–3.63V). At 2.5V, R_ON increases significantly (>15Ω), propagation delay degrades, and logic thresholds (VIH/VIL) fall outside guaranteed range-potentially causing unreliable switching.

Is external pull-up required on BE pins?

Yes. The datasheet specifies that a pull-up resistor must be provided on each BE pin for power-up protection. Without it, BE pins float during power-on, risking unintended conduction and potential bus contention or latch-up in downstream circuits.

Does PI3B3125QE support hot-swap insertion?

Yes-with proper power sequencing: apply V_CC and GND before any signal or control inputs. Its rail-to-rail input tolerance (–0.5V to +4.6V) and zero ground bounce allow safe hot-plug operation in systems designed with controlled ramp rates and current limiting on V_CC.

PI3B3125QE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-SSOP (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:: 16-QSOP

PI3B3125QE FAQ

1.How can I place an order for PI3B3125QE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3125QE 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 PI3B3125QE reliable?

The price and inventory of PI3B3125QE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3125QE is usually 5 days.

3.What payment methods are accepted for PI3B3125QE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3125QE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3125QE?

PI3B3125QE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3125QE 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 PI3B3125QE?

For technical support, including PI3B3125QE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3125QE requirements.

6.How does Aetrix verify that PI3B3125QE is sourced from the original manufacturer or authorized distributors?

All PI3B3125QE 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 PI3B3125QE meets industry standards.

7.What is the process for return or replacement of PI3B3125QE?

All PI3B3125QE units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3125QE, 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 PI3B3125QE part is unused and in its original packaging.

Return procedure for PI3B3125QE:

1.Submit a request within 90 days.

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

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