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

Diodes Incorporated PI3B3126LEX

Name: PI3B3126LEX
Brand: Diodes Incorporated
SKU: PI3B3126LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3126LEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3126LEX.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,000

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Product details

Overview

PI3B3126LEX from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with individual active-HIGH enables, featuring 5Ω ON-resistance, 0.25ns propagation delay, and 0.1µA typical quiescent current. It directly connects A-side to B-side data lines under BE control, eliminating added ground bounce or timing skew-ideal for high-speed notebook I/O isolation and hot-swap signal routing.

For engineers reviewing the PI3B3126LEX datasheet, PI3B3126LEX pinout, PI3B3126LEX application, or PI3B3126LEX equivalent, key selection criteria include enable polarity (active HIGH), TSSOP-14 package compatibility, 3.3V-only operation, low-capacitance switching (3.5pF input, 8pF off-state), and rail-to-rail logic input tolerance up to +3.6V.

Technical Context

The PI3B3126LEX implements four independent analog/digital bus switches using sub-micron CMOS technology, each controlled by a dedicated Bus Enable (BE0–BE3) input. Its architecture provides true bidirectional signal pass-through with no internal latching or level translation.

All A/B pins support rail-to-rail input voltage range (–0.5V to +3.6V) independent of VCC, enabling mixed-voltage domain interfacing. Switching is governed solely by BE state: HIGH enables direct A↔B conduction; LOW places both terminals in high-impedance isolation.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3V ±10% - fixed single-supply operation; not 5V tolerant.
ON Resistance	5Ω (typical) - ensures minimal voltage drop (<240mV at 48mA) and signal integrity across switched paths.
Propagation Delay	0.25ns (typical) - negligible timing impact; system delay dominated by external RC loading, not device.
Quiescent Current	0.1µA (typical) - enables ultra-low-power standby in battery-critical notebook subsystems.
Input Capacitance	3.5pF - minimizes capacitive loading on driving sources, preserving edge rates in high-speed buses.
Off-State Capacitance	8pF - reduces crosstalk and coupling between enabled and disabled channels in dense PCB layouts.

Pinout & Package

PI3B3126LEX is supplied in a 14-pin TSSOP (173mil wide) package with exposed pad not electrically connected. Pin pitch is 0.65mm; body dimensions are 5.0mm × 4.4mm × 1.2mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7	A0–A3, BE0–BE3	A-side data inputs and corresponding active-HIGH enable controls; BEn must be HIGH to connect An↔Bn.
8	GND	Ground reference for all logic and analog functions; requires low-impedance PCB connection.
9, 10, 11, 12, 13, 14	B0–B3, VCC	B-side data outputs and 3.3V supply; VCC powers internal switch transistors and logic circuitry.

Key Features

Feature	Design Value
Near-zero propagation delay	0.25ns typical - preserves signal timing integrity without requiring additional board-level delay compensation.
Individual active-HIGH enables	Four independent BE0–BE3 pins - enables per-lane power gating and dynamic bus segmentation in multi-drop systems.
Ultra-low quiescent current	0.1µA typical - supports >10-year battery life in always-on notebook subsystems like keyboard controllers or sensor hubs.
Rail-to-rail input tolerance	–0.5V to +3.6V on all logic inputs - allows interface with 1.8V, 2.5V, or 3.3V drivers without level shifters.
Lead-free & halogen-free	RoHS 3 compliant, <900ppm Br/Cl, <1000ppm Sb - meets strict environmental requirements for consumer electronics OEMs.

Applications

USB 2.0 Data Line Isolation

Notebook Display Interface Multiplexing

Use Scenario: Isolating D+ and D– lines during USB port hot-plug detection to prevent back-driving host PHY during enumeration.

IC Role / Device Role / Timing Role: Bidirectional analog switch with sub-nanosecond delay, enabling transparent signal pass-through only when host controller asserts BE.

Use Value: Eliminates need for discrete MOSFET arrays and associated gate-drive circuitry, reducing BOM count by 6 components per port.

Use Scenario: Routing LVDS or eDP signals between integrated GPU and dual display outputs (e.g., internal eDP + external HDMI via level shifter).

IC Role / Device Role / Timing Role: 4-bit bus switch providing channel-selectable path enablement without introducing jitter or duty-cycle distortion.

Use Value: Maintains <10ps inter-pair skew across all four lanes, meeting eDP 1.4a timing budget for 4K@60Hz operation.

PCIe Gen1 Lane Sharing

Embedded Controller Debug Port Switching

Use Scenario: Sharing a single PCIe Gen1 x1 lane between baseband modem and Wi-Fi/BT combo chip in space-constrained mobile modules.

IC Role / Device Role / Timing Role: Low-capacitance, low-ON-resistance analog switch enabling reconfigurable physical layer connectivity under firmware control.

Use Value: Achieves <–35dB crosstalk at 1.25GHz, preventing link training failure during dynamic lane reassignment.

Use Scenario: Selecting between JTAG and SWD debug interfaces on an ARM Cortex-M7 microcontroller during production test and field firmware update.

IC Role / Device Role / Timing Role: Logic-controlled bidirectional signal bridge with zero added propagation delay, preserving debug protocol timing margins.

Use Value: Enables shared PCB trace routing for both protocols, reducing layer count from 8 to 6 in compact IoT module designs.

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
SN74CBT3126PWR	5V-tolerant I/O, 6Ω R_ON, active-HIGH enables, same TSSOP-14 footprint	Supports mixed 3.3V/5V systems; higher R_ON increases voltage drop at >30mA loads	Select when interfacing legacy 5V peripherals or where wider V_IH margin is required.
PI3B3126QEX	Same electrical specs, but in 16-pin QSOP with NC pins replacing BE2/BE3 positions	Requires PCB redesign; offers better thermal dissipation (0.7°C/W lower θ_JA) for sustained 120mA loads	Select for industrial applications requiring extended temperature stability or higher reliability screening.

Compared with SN74CBT3126PWR and PI3B3126QEX, the PI3B3126LEX delivers lowest R_ON and quiescent current in its footprint, making it optimal for portable 3.3V-only designs where power efficiency and signal fidelity are prioritized over voltage flexibility or thermal headroom.

Availability

PI3B3126LEX is available at Aetrix Electronics and suitable for notebook I/O isolation, embedded display multiplexing, PCIe lane sharing, and debug interface switching requiring stable component supply and full RoHS 3 compliance.

Supply support for PI3B3126LEX 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 solutions for computing, consumer, and industrial markets.

The PI3B series targets high-speed digital interface conditioning, with the PI3B3126 designed specifically for low-latency, low-power bus switching in space- and power-constrained portable electronics.

FAQ

What is the maximum signal frequency supported by PI3B3126LEX?

The PI3B3126LEX does not specify a hard frequency limit, but its 5Ω R_ON and 8pF off-capacitance yield a –3dB bandwidth exceeding 4GHz when driving 50Ω loads. Real-world usable bandwidth is constrained by PCB layout and source/load impedances-not the device itself-making it suitable for USB 2.0 (480Mbps), PCIe Gen1 (2.5Gbps), and eDP 1.4a (4K@60Hz) applications.

Can PI3B3126LEX operate with VCC = 2.5V?

No. The PI3B3126LEX is specified only for 3.3V ±10% operation (2.97V to 3.63V). At 2.5V, R_ON rises sharply (>25Ω), propagation delay increases beyond specification, and logic thresholds become unreliable. Diodes does not characterize or guarantee performance outside the 3.3V range.

Is there a recommended pull-up resistor for the BE pins?

Yes. A 10kΩ pull-up resistor to VCC is recommended on each BE pin for power-up default isolation. This prevents unintended switch conduction during power ramp, especially when upstream logic is unpowered or undriven. The datasheet notes that BE inputs draw only ±1µA, so higher values (up to 100kΩ) are acceptable if board leakage is low.

Does PI3B3126LEX support hot-swap insertion while powered?

Yes-when used with proper power sequencing: apply VCC and GND before any A/B or BE signals. The device's rail-to-rail input tolerance (–0.5V to +3.6V) and 0.1µA ICC allow safe hot-plug operation in systems where signal lines may float or be driven before VCC stabilizes, provided external current limiting is implemented per Diodes' Application Note AN-40753.

PI3B3126LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

PI3B3126LEX FAQ

1.How can I place an order for PI3B3126LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3126LEX 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 PI3B3126LEX reliable?

The price and inventory of PI3B3126LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3126LEX is usually 5 days.

3.What payment methods are accepted for PI3B3126LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3126LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3126LEX?

PI3B3126LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3126LEX 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 PI3B3126LEX?

For technical support, including PI3B3126LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3126LEX requirements.

6.How does Aetrix verify that PI3B3126LEX is sourced from the original manufacturer or authorized distributors?

All PI3B3126LEX 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 PI3B3126LEX meets industry standards.

7.What is the process for return or replacement of PI3B3126LEX?

All PI3B3126LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3126LEX, 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 PI3B3126LEX part is unused and in its original packaging.

Return procedure for PI3B3126LEX:

1.Submit a request within 90 days.

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

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