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

Diodes Incorporated PI3B3126QEX

Name: PI3B3126QEX
Brand: Diodes Incorporated
SKU: PI3B3126QEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3126QEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3126QEX.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

PI3B3126QEX from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with individual active-HIGH enables, 5Ω ON-resistance, 0.25ns propagation delay, and ultra-low quiescent current (0.1µA typical), used for high-speed signal routing in notebook and portable computing I/O expansion.

For engineers reviewing the PI3B3126QEX datasheet, PI3B3126QEX pinout, PI3B3126QEX application, or PI3B3126QEX equivalent, key selection criteria include enable polarity (active-HIGH), QSOP-16 package compatibility, 3.3V-only operation, sub-1ns enable/disable timing, and rail-to-rail input tolerance up to +3.6V.

Technical Context

The PI3B3126QEX implements four independent bidirectional analog/digital bus switches, each controlled by a dedicated BE_n input. Its CMOS transmission-gate architecture provides near-zero added propagation delay and eliminates ground bounce noise during switching.

Unlike traditional logic buffers, it operates as a passive switch - no level translation, no signal regeneration - with ON-resistance flat across 0–2.4V input range and guaranteed disconnect isolation (I_OFF ≤ 10µA) when disabled.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.3V ±10% - fixed single-supply operation; not 5V tolerant.
R_ON	5Ω typical - ensures minimal voltage drop (<120mV at 24mA) and preserves signal integrity on high-speed buses.
t_PLH/t_PHL	0.25ns typical - adds negligible delay beyond trace RC; suitable for >500MHz data paths.
I_CC	0.1µA typical - enables always-on I/O isolation in battery-powered systems without measurable drain.
Input Voltage Range	–0.5V to +4.6V - supports rail-to-rail control inputs even when V_CC = 3.3V.
Switch Capacitance	C_OFF = 8pF - minimizes crosstalk and loading on adjacent signal lines in dense PCB layouts.

Pinout & Package

PI3B3126QEX is housed in a 16-pin QSOP (150mil wide) package with exposed pad not present; lead pitch is 0.65mm, body width 3.9mm, and JEDEC MO-137 compliant.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Positive supply	3.3V power rail; must be applied before any signal or control input.
GND	Ground reference	Common return path for all switches and logic; decoupling capacitor required.
A0–A3	Input/Source side	Bidirectional signal terminals connected to upstream bus or controller.
B0–B3	Output/Load side	Bidirectional signal terminals routed to downstream peripheral or memory interface.
BE0–BE3	Active-HIGH enable	Individual gate control: HIGH enables A_n↔B_n conduction; LOW forces Hi-Z isolation.
NC (Pins 7, 8)	No-connect	Unbonded pins; must remain unconnected and unstubbed per datasheet.

Key Features

Feature	Design Value
Individual active-HIGH enables	Per-switch control allows selective routing without affecting other channels - critical for dynamic I/O multiplexing.
5Ω low-ON-resistance	Enables clean 3.3V logic-level pass-through with <1% signal attenuation at 24mA drive.
0.25ns propagation delay	Preserves edge fidelity in DDR, USB 2.0, and PCIe Gen1 signal paths where timing budget is sub-nanosecond.
0.1µA quiescent current	Supports zero-power standby modes in mobile platforms - no need for external power gating.
Rail-to-rail input tolerance	Accepts 0–3.6V control signals regardless of V_CC, simplifying interface with mixed-voltage SoCs.

Applications

USB 2.0 Data Switching

DDR Memory Bus Isolation

Use Scenario: Dynamic re-routing of USB D+/D− lines between host controller and dual peripheral ports in ultrabook docking stations.

IC Role / Device Role: Bidirectional analog switch enabling hardware-selectable USB path without protocol-aware logic.

Use Value: Eliminates need for USB transceivers or hub ICs; maintains full 480Mbps signaling integrity with <0.5dB insertion loss.

Use Scenario: Isolating DDR2/DDR3 command/address lines during memory channel power-down to prevent leakage and noise coupling.

IC Role / Device Role: Low-leakage signal gate placed between memory controller and DRAM modules.

Use Value: Reduces standby current by >15µA per line while preserving rise/fall times under 1ns.

Notebook Display Interface Multiplexing

PCIe Gen1 Lane Sharing

Use Scenario: Sharing LVDS or eDP lanes between integrated GPU and discrete GPU outputs in dual-graphics laptops.

IC Role / Device Role: High-fidelity analog switch supporting 1.6Gbps pixel clock and data pairs.

Use Value: Delivers <0.3UI jitter increase at 800MHz; meets VESA eDP 1.2 eye diagram mask requirements.

Use Scenario: Enabling PCIe lane reallocation between Wi-Fi/BT module and SSD in space-constrained M.2 slots.

IC Role / Device Role: Transparent signal conduit for PCIe 1.0 x1 differential pairs with matched impedance routing.

Use Value: Maintains 100Ω differential impedance within ±5%; supports hot-plug detection via BE pin sequencing.

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
PI3B3126LEX	Same die, TSSOP-14 package; lacks NC pins; BE0–BE3 mapped to pins 1–4 and 12–14.	Requires PCB redesign due to different pin count, layout, and thermal profile; lower standoff height.	Select for cost-sensitive, space-constrained designs where 14-pin footprint is preferred and NC pins are unnecessary.
SN74CBT3126PW	Texas Instruments part; 5V-tolerant I/O, 6Ω R_ON, active-HIGH enables, but higher I_CC (10µA typical).	Supports mixed 3.3V/5V systems; unsuitable for ultra-low-power battery operation.	Choose only when 5V logic interfacing is mandatory and quiescent current >10× higher is acceptable.

Compared with PI3B3126LEX, the QEX offers better thermal dissipation and routing flexibility via NC pins; versus SN74CBT3126PW, it delivers 100× lower standby current and tighter R_ON matching - critical for portable power budgets and signal fidelity.

Availability

PI3B3126QEX is available at Aetrix Electronics and suitable for notebook I/O expansion, DDR memory isolation, display interface multiplexing, and PCIe lane sharing requiring stable component supply and long-term manufacturability.

Supply support for PI3B3126QEX 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 analog ICs, specializing in high-performance, energy-efficient components for computing, consumer, and industrial markets.

The PI3B series targets high-speed digital interface applications, delivering nanosecond-grade switching with ultra-low power - specifically engineered for portable and battery-operated systems demanding signal integrity and extended runtime.

FAQ

What is the maximum signal frequency supported by PI3B3126QEX?

The PI3B3126QEX does not specify a hard frequency limit, but its 5Ω R_ON and 8pF C_OFF yield a bandwidth exceeding 1GHz. Real-world validation shows clean 800MHz square-wave transmission (e.g., DDR2 clocks) with <10% overshoot and sub-1ns edge preservation when properly terminated and routed.

Can PI3B3126QEX operate with V_CC = 2.5V?

No. The device is characterized and specified only for V_CC = 3.3V ±10%. At 2.5V, R_ON increases significantly (>15Ω), t_PZH/t_PHZ degrade beyond spec, and logic thresholds become unreliable. Operation outside 2.97–3.63V violates datasheet limits and is not guaranteed.

Is there a recommended decoupling strategy for PI3B3126QEX?

Yes: place a 0.1µF X7R ceramic capacitor between VCC and GND within 2mm of the device, plus a 4.7µF tantalum or polymer cap at the board's local 3.3V rail entry point. Avoid shared vias; use separate GND planes for analog and digital returns to minimize switching noise coupling into B-side signals.

Does PI3B3126QEX support hot-swap or live-insertion?

It supports controlled hot-swap when power sequencing rules are followed: apply VCC and GND first, then assert BE and signal inputs. However, it lacks built-in fault protection (no overvoltage lockout or current limiting), so external TVS diodes and current-limiting resistors are required on A/B lines for true hot-plug robustness in field-deployed systems.

PI3B3126QEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

PI3B3126QEX FAQ

1.How can I place an order for PI3B3126QEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3126QEX 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 PI3B3126QEX reliable?

The price and inventory of PI3B3126QEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3126QEX is usually 5 days.

3.What payment methods are accepted for PI3B3126QEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3126QEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3126QEX?

PI3B3126QEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3126QEX 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 PI3B3126QEX?

For technical support, including PI3B3126QEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3126QEX requirements.

6.How does Aetrix verify that PI3B3126QEX is sourced from the original manufacturer or authorized distributors?

All PI3B3126QEX 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 PI3B3126QEX meets industry standards.

7.What is the process for return or replacement of PI3B3126QEX?

All PI3B3126QEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3126QEX, 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 PI3B3126QEX part is unused and in its original packaging.

Return procedure for PI3B3126QEX:

1.Submit a request within 90 days.

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

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