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

Diodes Incorporated PI3B3126QE

Name: PI3B3126QE
Brand: Diodes Incorporated
SKU: PI3B3126QE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3126QE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3B3126QE.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI3B3126QE from Diodes Incorporated is a 3.3V, 4-bit, 2-port bus switch with individual active-HIGH enables, fabricated in advanced sub-micron CMOS. It features four 5Ω analog switches, 0.25ns propagation delay, 1.0–2.5ns enable time, and 0.1µA typical quiescent current. It is used in notebook I/O isolation and low-power data path routing.

For engineers reviewing the PI3B3126QE datasheet, PI3B3126QE pinout, PI3B3126QE application, or PI3B3126QE equivalent, key selection criteria include active-HIGH enable logic, QSOP-16 package compatibility, 5Ω on-resistance at 3.3V, ultra-low ICC, and rail-to-rail input tolerance up to +3.6V.

Technical Context

The PI3B3126QE implements four independent bidirectional analog switches, each controlled by a dedicated Bus Enable (BE0–BE3) input. Each switch connects A_n to B_n when its BE_n is HIGH; otherwise, it presents high-impedance isolation between ports.

It operates strictly at 3.3V ±10% over –40°C to +85°C, supports rail-to-rail input voltages up to +3.6V regardless of V_CC, and introduces no added propagation delay beyond RC effects-verified by 0.25ns t_PLH/t_PHL and <1.0ns t_PZH under 50pF/500Ω load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.3V ±10% - defines operating voltage window for guaranteed timing and R_ON performance
R_ON	5Ω typ. at V_CC = min., V_IN = 0V, I_ON = 48mA - ensures minimal signal attenuation in 3.3V data paths
t_PLH/t_PHL	0.25ns max. (CL = 50pF, RL = 500Ω) - enables high-speed digital bus switching without timing penalty
t_PZH/t_PZL	1.0–2.5ns max. - determines minimum enable assertion time before valid data transfer
I_CC	0.1µA typical - allows integration into always-on, battery-sensitive subsystems without leakage impact
Input Voltage Range	–0.5V to +3.6V - supports mixed-voltage interfacing and hot-plug tolerant control signaling
Switch Off Capacitance	8pF max. - limits crosstalk and maintains signal integrity in high-density PCB layouts

Pinout & Package

PI3B3126QE is supplied in a 16-pin QSOP (Q) package with 0.635mm pitch, 3.9mm × 9.9mm body, and gull-wing leads. The package is lead-free, RoHS 3 compliant, and halogen/antimony free per Diodes' Green definition.

Pin/Terminal	Circuit Role	Design Meaning
1, 16	V_CC, GND	Power and ground reference pins - must be decoupled locally to suppress switching noise
2–5, 10–13	A0–A3, B0–B3	Bidirectional analog/data bus terminals - interchangeable directionality; no internal polarity
6–9, 14, 15	BE0–BE3	Active-HIGH individual enable inputs - each controls one A_n↔B_n switch independently
7, 8, 11, 12	NC	No-connect pins - left unconnected per datasheet; not internally bonded

Key Features

Feature	Design Value
Individual active-HIGH enables	Enables per-switch power gating and dynamic bus partitioning without external logic inversion
5Ω on-resistance	Minimizes voltage drop and distortion in 3.3V digital and analog signal routing paths
0.25ns propagation delay	Preserves signal edge integrity across high-speed parallel buses (e.g., LPC, SMBus, GPIO expansion)
0.1µA quiescent current	Supports always-on system monitoring circuits without compromising battery runtime
Rail-to-rail input tolerance	Allows direct interface with 1.8V, 2.5V, or 3.3V drivers without level-shifting circuitry

Applications

Notebook I/O Isolation

LPC Bus Expansion

Use Scenario: Isolating USB, audio, or keyboard controller signals during sleep mode to prevent backdrive and leakage.

IC Role / Device Role: Bidirectional analog switch enabling/disabling signal paths under firmware control.

Use Value: Eliminates need for discrete MOSFETs or level shifters while maintaining 5Ω path resistance and <1ns enable timing.

Use Scenario: Adding secondary LPC peripherals (e.g., TPM, EC) without modifying host chipset routing.

IC Role / Device Role: Low-latency bus repeater that preserves signal rise/fall times and timing margins.

Use Value: Enables plug-and-play peripheral addition with zero added propagation delay and full 3.3V compatibility.

Hot-Plug GPIO Multiplexing

Low-Power Sensor Hub Interface

Use Scenario: Dynamically reassigning shared GPIO lines between multiple sensors or actuators in portable devices.

IC Role / Device Role: Configurable signal router with independent enable control per channel.

Use Value: Reduces PCB layer count and eliminates mechanical switches or jumpers while supporting 3.6V-tolerant control inputs.

Use Scenario: Connecting multiple I²C or SPI sensors to a single MCU interface while minimizing standby current.

IC Role / Device Role: Power-gated bus switch isolating inactive sensor channels from the main bus.

Use Value: Cuts system-wide quiescent current by >100µA per isolated sensor using 0.1µA device ICC.

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, 14-pin TSSOP package - 1.73mm width, higher thermal resistance (θ_JA = 120°C/W vs. 95°C/W)	Suitable for space-constrained boards where QSOP footprint is prohibitive	Select when board area is critical and thermal margin permits higher junction temperature rise
SN74CBT3126DBQR	Texas Instruments part: 5V-tolerant inputs, 6Ω R_ON, 3.5ns enable time, SOIC-16 package	Requires 5V supply; not compatible with 3.3V-only systems or rail-to-rail ≤3.6V inputs	Choose only if legacy 5V infrastructure exists and 3.3V operation is not required

Compared with PI3B3126LEX and SN74CBT3126DBQR, the PI3B3126QE delivers superior thermal performance in QSOP, lowest enable latency, and unique 3.3V-optimized rail-to-rail input support-making it ideal for modern ultra-thin notebooks and battery-powered sensor hubs.

Availability

PI3B3126QE is available at Aetrix Electronics and suitable for notebook I/O isolation, LPC bus expansion, and low-power sensor hub interface requiring stable component supply, long-term lifecycle assurance, and RoHS 3/Green compliance.

Supply support for PI3B3126QE 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 designed for 3.3V data path isolation, hot-plug I/O routing, and battery-sensitive portable electronics.

FAQ

What is the maximum allowable input voltage on BE, A, or B pins?

The PI3B3126QE supports input voltages from –0.5V to +3.6V on all logic and data pins, independent of V_CC. This rail-to-rail tolerance allows direct interfacing with 1.8V, 2.5V, or 3.3V drivers without level shifters, and accommodates overshoot during hot-plug events.

Can PI3B3126QE be used with a 2.5V supply?

No. The device is specified only for 3.3V ±10% operation. At 2.5V, R_ON increases significantly (>15Ω), t_PZH degrades beyond spec, and logic thresholds become unreliable. Diodes does not guarantee functionality outside the 2.97–3.63V range.

Are the NC pins on PI3B3126QE required to be grounded or left floating?

The NC pins (pins 7, 8, 11, 12) are not internally connected and must remain unconnected-neither grounded nor tied to V_CC. Soldering or routing to these pins may cause mechanical stress or unintended coupling; the datasheet explicitly prohibits any connection.

Does PI3B3126QE support bidirectional signal flow without direction control pins?

Yes. Each A_n–B_n pair functions as a fully bidirectional analog switch. No direction pin is needed-the signal path is symmetric, and voltage/current flow direction depends solely on external source/sink configuration, not internal logic.

PI3B3126QE 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

PI3B3126QE FAQ

1.How can I place an order for PI3B3126QE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3126QE 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 PI3B3126QE reliable?

The price and inventory of PI3B3126QE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3126QE is usually 5 days.

3.What payment methods are accepted for PI3B3126QE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3126QE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3126QE?

PI3B3126QE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3126QE 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 PI3B3126QE?

For technical support, including PI3B3126QE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3126QE requirements.

6.How does Aetrix verify that PI3B3126QE is sourced from the original manufacturer or authorized distributors?

All PI3B3126QE 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 PI3B3126QE meets industry standards.

7.What is the process for return or replacement of PI3B3126QE?

All PI3B3126QE units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3126QE, 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 PI3B3126QE part is unused and in its original packaging.

Return procedure for PI3B3126QE:

1.Submit a request within 90 days.

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

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