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

Diodes Incorporated PI3B3244LEX

Name: PI3B3244LEX
Brand: Diodes Incorporated
SKU: PI3B3244LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3244LEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI3B3244LEX.pdf

Description:: IC BUS SWITCH 4 X 1:1 20TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,187

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Product details

Overview

PI3B3244LEX from Diodes Incorporated is a 3.3V, 8-bit dual-port bus switch IC with two independent enable-controlled bidirectional switch banks (A0–A7/B0–B7), 5 Ω on-resistance, 4.5 ns max switching time, and ultra-low 0.2 μA typical quiescent current-designed for hot-insertion in notebook and portable computing systems.

For engineers reviewing the PI3B3244LEX datasheet, PI3B3244LEX pinout, PI3B3244LEX application, or PI3B3244LEX equivalent, key selection criteria include bidirectional 3.3V logic-level compatibility, near-zero propagation delay, rail-to-rail input tolerance up to +3.6V, and Pb-free TSSOP-20 packaging for space-constrained PCB layouts.

Technical Context

The PI3B3244LEX implements two independent 8-bit bidirectional bus switches controlled by active-low BE1 and BE2 signals, enabling selective connection between Bus A and Bus B ports without introducing propagation delay beyond RC time constant of 5 Ω R_ON and load capacitance. It operates strictly at 3.3V ±10% supply with no level-shifting capability.

Its CMOS-based NanoSwitch architecture eliminates ground bounce and supports hot-plug operation via rail-to-rail input tolerance (–0.5 V to +3.6 V), while quiescent current remains below 0.2 μA-critical for battery-powered systems requiring low standby power.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC	3.3 V ±10% - fixed single-supply operation; no dual-rail or voltage translation support
R_ON	5 Ω typical - enables low-loss signal pass-through with <0.25 ns RC time constant into 50 pF load
t_SW	4.5 ns max - defines maximum transition time for full bus enable/disable under 50 pF/500 Ω load
I_Q	0.2 μA typical - ensures negligible battery drain during system sleep modes
V_IH/V_IL	2.0 V / 0.8 V - compatible with TTL and 3.3V CMOS logic thresholds
Input Voltage Range	–0.5 V to +3.6 V - allows safe interfacing with overdriven or out-of-spec control signals
Hot-Insertion Support	Yes - enabled by power sequencing tolerance and rail-to-rail input structure

Pinout & Package

Package: 20-pin TSSOP (173-mil wide), Pb-free and RoHS-compliant (Green). Pin pitch: 0.65 mm.

Pin/Terminal	Circuit Role	Design Meaning
BE1, BE2	Active-low bus enable inputs	Independent control of Bank 1 (A0–A7 ↔ B0–B7) and Bank 2 (A0–A7 ↔ B0–B7); both must be LOW to activate respective bank
A0–A7	Port A bidirectional data terminals	Connect to upstream logic or controller; tolerate –0.5 V to +3.6 V regardless of V_CC
B0–B7	Port B bidirectional data terminals	Connect to downstream peripheral or expansion bus; electrically identical to Port A
V_CC	Positive supply	3.3 V only; must be applied before any signal to prevent latch-up
GND	Ground reference	Common return path for all I/O and supply currents; requires low-impedance PCB plane

Key Features

Feature	Design Value
Bidirectional 8-bit switching per bank	Two independent 8-bit paths (Bank 1: A0–A7 ↔ B0–B7; Bank 2: same) enable flexible bus isolation or multiplexing
Near-zero propagation delay	No added logic delay-only RC delay from 5 Ω R_ON and load capacitance; preserves signal integrity in high-speed buses
Ultra-low quiescent current	0.2 μA typical ensures <1 μW static power draw-ideal for always-on subsystems in portable devices
Rail-to-rail input tolerance	Inputs accept –0.5 V to +3.6 V independent of V_CC, simplifying interface with mixed-voltage or overdriven drivers
Hot-insertion capability	Validated for live insertion into powered backplanes due to controlled turn-on/off timing and ESD-hardened I/O

Applications

Notebook System Expansion Slot

Portable SSD Interface Isolation

Use Scenario: Isolating PCIe or SATA lanes during hot-swap of M.2 modules in ultrabooks.

IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling data paths without interrupting host controller clock domain.

Use Value: Prevents signal contention and ground bounce during insertion/removal, supported by 4.5 ns disable time and rail-to-rail input tolerance.

Use Scenario: Enabling/disabling communication between SoC and removable NVMe storage in thin-and-light laptops.

IC Role / Device Role / Timing Role: Low-R_ON switch isolating 3.3V I/O lines while maintaining signal rise/fall times under 50 pF load.

Use Value: 5 Ω R_ON minimizes voltage drop and jitter; 0.2 μA I_Q extends battery life during storage sleep states.

Industrial USB Hub Power Management

Embedded DisplayPort Auxiliary Channel Switching

Use Scenario: Controlling power domain isolation for USB 2.0 downstream ports in ruggedized tablet docking stations.

IC Role / Device Role / Timing Role: Dual-bank switch selectively connecting host D+/D− to peripheral ports based on enable state.

Use Value: Independent BE1/BE2 control allows staggered port activation; hot-plug compliance prevents bus lockup during reconnection.

Use Scenario: Multiplexing AUX CH signals between multiple display sources in compact digital signage controllers.

IC Role / Device Role / Timing Role: Bidirectional analog-capable switch routing low-speed sideband signals without DC blocking or level shift.

Use Value: Near-zero propagation delay preserves AUX CH timing margins; 8 pF C_OFF limits crosstalk between inactive channels.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PI3CH3244LEX	Successor part with enhanced ESD rating (±8 kV HBM), same pinout and R_ON, but higher ICC (1.5 μA typ)	Required for new designs targeting IEC 61000-4-2 Level 4 compliance	Select when robustness against handling ESD exceeds priority over ultra-low I_Q
SN74CBT3244CPWR	TI part with 6 Ω R_ON, 5 ns max t_SW, 1.5 μA I_Q, same 20-pin TSSOP footprint	Compatible in legacy board layouts but lacks rail-to-rail input tolerance (max VIN = V_CC + 0.5 V)	Acceptable where control signals stay within 3.3V ±0.5V and ESD immunity is secondary

Compared with PI3B3244LEX, PI3CH3244LEX improves ESD robustness at slight I_Q cost, while SN74CBT3244CPWR offers broader vendor availability but tighter input voltage constraints-making PI3B3244LEX optimal for ultra-low-power, hot-plug-critical notebook subsystems.

Availability

PI3B3244LEX is available at Aetrix Electronics and suitable for notebook expansion slot isolation, portable SSD interface management, industrial USB hub power control, and embedded DisplayPort auxiliary channel routing requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for PI3B3244LEX 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 computing, industrial, and consumer markets.

The PI3B series targets low-latency, low-power bus switching in portable and hot-pluggable systems-designed specifically for 3.3V logic domains where signal integrity, power efficiency, and physical robustness are critical.

FAQ

Is PI3B3244LEX pin-compatible with 74F244 or 74ALS244?

No. PI3B3244LEX is functionally compatible with those parts as a bus switch, but it is not pin-compatible. Unlike the 74F244 (20-pin DIP/SOIC with output-enable and direction-control pins), PI3B3244LEX uses dual active-low BE inputs and bidirectional A/B ports in a 20-pin TSSOP layout optimized for zero-delay switching-not level translation or driving.

Can PI3B3244LEX operate at 2.5V or 5V supply?

No. PI3B3244LEX is specified only for 3.3V ±10% (2.97 V to 3.63 V). Operation outside this range violates Absolute Maximum Ratings and may cause latch-up or parametric failure. Its rail-to-rail inputs tolerate up to +3.6 V, but V_CC must remain at 3.3 V.

Does PI3B3244LEX support level shifting between different voltage domains?

No. PI3B3244LEX is a passive bidirectional switch-not a level translator. Both sides of each switch bank (A and B) must operate at the same 3.3V logic level. It does not translate voltages; it passes signals with minimal attenuation and delay when enabled.

What is the maximum capacitive load PI3B3244LEX can drive reliably?

PI3B3244LEX is characterized up to 50 pF load with guaranteed 4.5 ns max switching time. For loads exceeding 50 pF, rise/fall times increase linearly with R_ON × C_L; design margin requires limiting total trace + pin + load capacitance to ≤75 pF to maintain signal integrity in 100 Mbps+ applications.

PI3B3244LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Bus Switch

Circuit:: 4 x 1:1

Independent Circuits:: 2

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:: 20-TSSOP

PI3B3244LEX FAQ

1.How can I place an order for PI3B3244LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3244LEX 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 PI3B3244LEX reliable?

The price and inventory of PI3B3244LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3244LEX is usually 5 days.

3.What payment methods are accepted for PI3B3244LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3244LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3244LEX?

PI3B3244LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3244LEX 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 PI3B3244LEX?

For technical support, including PI3B3244LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3244LEX requirements.

6.How does Aetrix verify that PI3B3244LEX is sourced from the original manufacturer or authorized distributors?

All PI3B3244LEX 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 PI3B3244LEX meets industry standards.

7.What is the process for return or replacement of PI3B3244LEX?

All PI3B3244LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3244LEX, 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 PI3B3244LEX part is unused and in its original packaging.

Return procedure for PI3B3244LEX:

1.Submit a request within 90 days.

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

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