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

Diodes Incorporated PI3B32X245BEX

Name: PI3B32X245BEX
Brand: Diodes Incorporated
SKU: PI3B32X245BEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B32X245BEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 40-FSOP (0.154", 3.90mm Width)

Datasheet:: PI3B32X245BEX.pdf

Description:: IC BUS SWITCH 8 X 1:1 40BQSOP

Quantity:: RFQ Add To RFQ list

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Inventory:4,474

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Product details

Overview

PI3B32X245BEX from Diodes Incorporated is a 3.3V, 16-bit, 2-port bus switch with dual active-low enable inputs (BE1/BE2), 5Ω typical on-resistance, 4.5ns max bus disable time, and ultra-low 1.0µA quiescent current-designed for hot-insertion-capable notebook memory expansion buses.

For engineers reviewing the PI3B32X245BEX datasheet, PI3B32X245BEX pinout, PI3B32X245BEX application, or PI3B32X245BEX equivalent, key selection criteria include bidirectional switching latency, TTL-compatible control logic, industrial temperature range (–40°C to +85°C), and BQSOP-40 package compatibility with high-density PCB layouts.

Technical Context

This device implements a passive FET-based analog bus switch architecture with no internal logic or level-shifting circuitry-signal integrity relies entirely on low R_ON (5–8Ω) and minimal parasitic capacitance (C_ON = 16.0pF, C_OFF = 8.0pF). It operates strictly at 3.3V supply with no voltage translation capability.

Propagation delay is not generated by the switch itself but arises solely from RC time constant of R_ON and load capacitance (e.g., ~0.25ns for 50pF); t_PZH/t_PLZ (1.0–4.5ns) reflects enable-to-output transition timing under defined test conditions (CL = 50pF, RL = 500Ω).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3V ±10% - fixed single-rail operation; no tolerance for 5V or mixed-voltage interfaces
On-Resistance (R_ON)	5Ω typ. - enables <100mV voltage drop at 20mA per path, preserving signal swing in 3.3V LVTTL systems
Bus Disable Time	1.0–4.5ns - ensures fast isolation during hot-plug events to prevent backdrive or bus contention
Quiescent Current	1.0µA typ. - supports battery-sensitive applications like notebook standby and sleep-state power gating
Operating Temperature	–40°C to +85°C - validated for industrial-grade embedded computing and peripheral expansion environments
Input Capacitance	3.5pF - minimizes loading on upstream drivers, maintaining signal edge rate in high-speed parallel buses
Switch Capacitance (ON)	16.0pF - contributes directly to total path capacitance; critical for timing budgeting in >100MHz bus designs

Pinout & Package

Package: 40-pin, 150-mil wide plastic BQSOP (B), Pb-free and RoHS-compliant (E suffix), tape-and-reel (X suffix).

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	Bi-directional Bus A port	Direct analog connection to upstream data/address bus; no direction control or buffering
B0–B15	Bi-directional Bus B port	Direct analog connection to downstream peripheral or expansion slot; fully symmetrical with A side
BE1, BE2	Active-low enable inputs	Independent control of two 16-bit switch banks; both must be LOW to connect corresponding A/B pairs
VCC	Power supply	3.3V only; powers internal gate drive and ESD protection-no internal regulation or brown-out detection
GND (pins 10,20)	Ground reference	Dual ground pins reduce return-path inductance for high-frequency switching transients
NC (pins 9,35)	No-connect	Internally unconnected; must remain floating or tied to GND per layout best practice

Key Features

Feature	Design Value
Hot-insertion support	Enabled by near-zero propagation delay and high-impedance state during disable-prevents bus contention during live card insertion
Ultra-low quiescent power	1.0µA typical ICC allows integration into always-on power domains without compromising system standby budget
TTL-compatible control inputs	VIH ≥ 2.0V / VIL ≤ 0.8V permits direct interfacing with legacy 3.3V LVTTL controllers without level shifters
Low on-resistance matching	5Ω typical R_ON with tight process control ensures <±0.5Ω skew across all 32 switches-critical for parallel bus timing alignment

Applications

Memory Expansion Interface

Notebook Peripheral Bus Isolation

Use Scenario: Adding external DDR2/DDR3 SO-DIMM slots to ultraportable notebooks while maintaining hot-plug capability.

IC Role / Device Role / Timing Role: Bidirectional analog pass-gate between host memory controller and expansion slot, enabling/disabling data paths without introducing timing uncertainty.

Use Value: Eliminates need for active repeaters or buffers-preserves original signal rise/fall times and reduces BOM count by 3+ components per channel.

Use Scenario: Isolating USB 2.0 or LPC bus segments during docking station attachment/detachment.

IC Role / Device Role / Timing Role: Low-latency, low-capacitance switch enabling clean break-before-make transitions on shared control buses.

Use Value: Prevents ground bounce and signal reflection during hot-swap events-meets Intel Platform Environment Control Interface (PECI) noise immunity requirements.

Industrial I/O Module Backplane

Test Equipment Signal Routing

Use Scenario: Configurable data path routing between FPGA-based controller and modular sensor/actuator cards in programmable logic controllers.

IC Role / Device Role / Timing Role: Passive analog switch bank controlled via FPGA GPIOs to reconfigure bus topology without firmware update.

Use Value: Enables field-upgradable I/O mapping-reduces need for multiple PCB revisions and supports multi-protocol sensor integration (SPI/I²C/parallel).

Use Scenario: Automated test fixture routing of DUT signals to measurement instruments (oscilloscopes, logic analyzers) under software control.

IC Role / Device Role / Timing Role: Low-R_ON, low-C_OFF switch providing sub-nanosecond path selection without signal degradation.

Use Value: Maintains signal fidelity up to 200MHz-avoids attenuation or ringing that would compromise jitter and eye-diagram measurements.

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
SN74CBT3245APWR	R_ON = 6Ω typ., t_PD = 0.25ns, same BQSOP-40 package, but higher ICC (10µA typ.)	Lacks explicit hot-insertion qualification; lower quiescent current sensitivity limits use in battery-critical designs	Preferred when absolute minimum propagation delay is prioritized over standby power
PI3CH485BEX	48-channel, 3.3V, 8Ω R_ON, different pinout (48-TSSOP), no dual-enable architecture	Designed for PCIe Gen1/Gen2 lane switching-not suitable for synchronous parallel bus isolation	Select only for high-channel-count serial link routing where pin compatibility is secondary

Compared with SN74CBT3245APWR and PI3CH485BEX, the PI3B32X245BEX uniquely balances ultra-low ICC (1.0µA), dual independent enables, and hot-insertion validation-making it optimal for portable, field-upgradeable, and thermally constrained parallel bus architectures.

Availability

PI3B32X245BEX is available at Aetrix Electronics and suitable for notebook memory expansion, industrial I/O backplanes, test equipment signal routing, and docking station peripheral isolation requiring stable component supply and long-term lifecycle assurance.

Supply support for PI3B32X245BEX 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 PI3B32X245 belongs to Diodes' Pericom bus switch product line-engineered specifically for low-latency, low-power, hot-pluggable parallel bus isolation in space-constrained portable and embedded systems.

FAQ

What is the maximum capacitive load this bus switch can drive while maintaining signal integrity?

The PI3B32X245BEX is characterized with CL = 50pF in switching tests. Its 5Ω R_ON and 16.0pF C_ON yield an RC time constant of ~0.25ns, supporting clean edges up to ~200MHz. Loads exceeding 75pF may degrade rise/fall times beyond JEDEC LVTTL specifications-layout parasitics must be included in total load calculation.

Can PI3B32X245BEX operate with 2.5V or 5V supply rails?

No. The device is specified exclusively for 3.3V ±10% operation. Supply voltage outside 2.97V–3.63V violates Absolute Maximum Ratings and risks permanent damage. It lacks internal voltage regulation or level translation-2.5V or 5V supplies will cause functional failure or latch-up.

How does the dual-enable architecture improve system reliability during hot insertion?

BE1 and BE2 independently control two 16-bit banks, allowing staggered activation-e.g., address lines enabled before data lines. This prevents metastability and bus contention during partial insertion, reducing risk of controller lockup or data corruption in live expansion scenarios.

Is there any built-in ESD protection, and what is its rating?

Yes-the device includes on-chip ESD protection rated to ±2kV HBM per JESD22-A114. This meets standard IEC 61000-4-2 Level 2 requirements for board-level handling but does not replace system-level TVS diodes for harsh industrial environments.

PI3B32X245BEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 40-FSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 8 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:: 40-BQSOP

PI3B32X245BEX FAQ

1.How can I place an order for PI3B32X245BEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B32X245BEX 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 PI3B32X245BEX reliable?

The price and inventory of PI3B32X245BEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B32X245BEX is usually 5 days.

3.What payment methods are accepted for PI3B32X245BEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B32X245BEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B32X245BEX?

PI3B32X245BEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B32X245BEX 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 PI3B32X245BEX?

For technical support, including PI3B32X245BEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B32X245BEX requirements.

6.How does Aetrix verify that PI3B32X245BEX is sourced from the original manufacturer or authorized distributors?

All PI3B32X245BEX 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 PI3B32X245BEX meets industry standards.

7.What is the process for return or replacement of PI3B32X245BEX?

All PI3B32X245BEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B32X245BEX, 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 PI3B32X245BEX part is unused and in its original packaging.

Return procedure for PI3B32X245BEX:

1.Submit a request within 90 days.

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

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