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

Diodes Incorporated PI3B3257LEX

Name: PI3B3257LEX
Brand: Diodes Incorporated
SKU: PI3B3257LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3B3257LEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI3B3257LEX.pdf

Description:: IC MUX/DEMUX 4 X 2:1 16TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

PI3B3257LEX from Diodes Incorporated is a 3.3 V quad 2:1 multiplexer/demultiplexer with three-state outputs, pinout- and function-compatible with 74F257, 74ALS257, and PI74FCT257T. It features 5 Ω switch on-resistance, 4.8 ns max bus disable time, and 0.1 µA typical quiescent current. Used in high-speed data routing for notebook and portable computing systems where low power and minimal propagation delay are critical.

For engineers reviewing the PI3B3257LEX datasheet, PI3B3257LEX pinout, PI3B3257LEX application, or PI3B3257LEX equivalent, key selection criteria include guaranteed 3.3 V operation, rail-to-rail logic input tolerance up to +3.6 V, ultra-low ICC, and compatibility with legacy 74-series logic footprints in TSSOP-16 packaging.

Technical Context

The PI3B3257LEX implements four independent bidirectional analog/digital switches controlled by a shared select (S) and enable (E) signal. Each switch exhibits near-zero propagation delay due to its low R_ON–C_OFF time constant (~0.25 ns with 50 pF load), and operates without ground bounce noise.

It supports hot-plug operation with rail-to-rail input drive capability (0 V to +3.6 V independent of V_CC), and uses CMOS-level control logic with TTL-compatible thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). The device is specified for –40°C to +85°C ambient operation at V_CC = 3.3 V ±10%.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply Voltage	3.3 V ±10% - Fixed single-supply operation; no dual-rail or level-shifting required
R_ON (Switch On-Resistance)	5 Ω typ. - Enables low-loss signal pass-through for analog/digital buses up to 120 mA
t_PZL/t_PHZ	4.8 ns max - Fast bus disable timing ensures clean output isolation during state transitions
I_CC Quiescent Current	0.1 µA typ. - Supports battery-powered notebook applications with negligible standby drain
Input Voltage Range	–0.5 V to +4.6 V - Allows interfacing with 3.3 V, 5 V, or mixed-voltage logic without external level shifters
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded and portable computing environments
C_IN Input Capacitance	3.0 pF - Minimizes loading on driving sources and preserves signal integrity at high frequencies

Pinout & Package

PI3B3257LEX is packaged in a 16-pin TSSOP (Thin Shrink Small Outline Package), 173 mil wide, lead-free and RoHS-compliant. Pin 1 is marked with a notch or dot; exposed pad is not present in this variant.

Pin/Terminal	Circuit Role	Design Meaning
E	Active-Low Enable	Asserted low to activate all four switches; high-Z output state when high
S	Common Select	Chooses between IA/IB/IC/ID0 (S = L) or IA/IB/IC/ID1 (S = H) for each channel
IA0–ID1	Data Inputs	Eight bidirectional input/output terminals grouped as four pairs (I0/I1 per channel)
YA–YD	Data Outputs	Four bidirectional switched outputs, each connected to corresponding I0/I1 pair
V_CC	Power Supply	3.3 V supply pin; decoupling capacitor required within 1 cm of pin
GND	Ground Reference	Signal and power ground return; must be low-impedance connection to system plane
NC	No Connect	Internally unconnected; must remain floating or tied to GND per layout guidelines

Key Features

Feature	Design Value
Quad 2:1 Mux/Demux Architecture	Four independent channels share one select and one enable line-reduces PCB routing complexity vs. discrete solutions
5 Ω Low On-Resistance Switches	Preserves signal amplitude and rise/fall times across full 3.3 V logic swing; avoids voltage droop under 120 mA load
Rail-to-Rail Input Drive Support	Accepts 0 V to +3.6 V logic inputs regardless of V_CC-enables direct interface with 5 V microcontrollers or FPGAs
0.1 µA Typical Quiescent Current	Enables always-on signal routing in battery-backed subsystems without measurable impact on runtime
TSSOP-16 Footprint Compatibility	Direct drop-in replacement for legacy 74-series 257 devices-no board redesign needed for upgrade paths

Applications

USB 2.0 Data Switching

Notebook Display Multiplexing

Use Scenario: Routing USB D+/D− signals between two upstream hosts and one downstream port in docking stations.

IC Role / Device Role / Timing Role: Bidirectional analog switch enabling host-controlled path selection without protocol awareness.

Use Value: 5 Ω R_ON and <2 pF C_OFF preserve USB 2.0 eye diagram integrity up to 480 Mbps; no added jitter or skew.

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

IC Role / Device Role / Timing Role: Transparent signal path selector activated by BIOS or EC firmware during GPU handoff.

Use Value: Near-zero propagation delay (<0.25 ns) prevents timing misalignment across differential pairs; supports 2.7 Gbps/lane.

PCIe Lane Reconfiguration

Industrial I/O Signal Routing

Use Scenario: Dynamically assigning PCIe ×4 lanes to different peripherals (e.g., NVMe SSD or FPGA) in edge compute modules.

IC Role / Device Role / Timing Role: High-speed digital bus switch enabling reconfigurable topology without PCIe retimers.

Use Value: 4.8 ns max disable time allows sub-microsecond lane reassignment; 3.3 V operation matches standard PCIe slot voltage.

Use Scenario: Isolating or routing sensor analog outputs (e.g., thermocouple, RTD) to multiple ADC inputs in programmable logic controllers.

IC Role / Device Role / Timing Role: Low-leakage, low-R_ON analog multiplexer supporting precision DC measurements.

Use Value: 0.1 µA I_CC eliminates self-heating error; 5 Ω R_ON contributes <0.01% gain error in 10 kΩ sensor bridges.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 mux/demux applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3257PWR	Higher R_ON (7 Ω typ.), higher ICC (1 µA), same 3.3 V supply but no rail-to-rail input support	Less suitable for mixed-voltage systems; requires level-shifter if driven by 5 V logic	Select when cost sensitivity outweighs input voltage flexibility and ultra-low ICC requirements
PI3CH481LE	Lower R_ON (3 Ω), higher speed (t_PZL = 3.8 ns), but only dual-channel and requires separate enables per channel	Requires additional control lines; not pin-compatible; better for high-density, performance-critical designs	Select when channel independence and sub-4 ns disable timing justify PCB redesign and BOM change

Compared with SN74CBT3257PWR and PI3CH481LE, the PI3B3257LEX uniquely balances pin compatibility with legacy 74-series logic, rail-to-rail input tolerance, and ultra-low quiescent current-making it optimal for drop-in upgrades in space-constrained portable systems.

Availability

PI3B3257LEX is available at Aetrix Electronics and suitable for notebook computing, industrial I/O modules, and USB docking station designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for PI3B3257LEX 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 ICs, specializing in high-performance, energy-efficient components for computing, industrial, and consumer markets.

The PI3B3257LEX belongs to Diodes' NanoSwitch™ bus switch product line, engineered for low-latency, low-power signal routing in portable and embedded systems where footprint, power, and compatibility are critical.

FAQ

Can PI3B3257LEX operate with a 5 V supply?

No. The absolute maximum V_CC rating is +4.6 V, but the device is characterized and specified only for 3.3 V ±10% operation. Using 5 V violates the recommended operating conditions and may cause excessive ICC, timing violations, or premature wear-out. For 5 V systems, use PI3B3257QEX or verify compatibility with Diodes' 5 V–rated alternatives like PI3CH481.

Is the PI3B3257LEX pinout identical across all package variants?

Yes. All official package variants (QSOP-Q, SOIC-W, TSSOP-L, UQFN-ZHD) maintain identical pin numbering and signal assignment per the datasheet's Pin Configuration diagrams. Mechanical dimensions differ, but PCB footprint designators and netlist connectivity remain consistent across packages.

What is the thermal pad requirement for PI3B3257LEX?

The PI3B3257LEX in TSSOP-16 (L package) has no exposed thermal pad. Unlike the UQFN-ZHD variant, the TSSOP package relies on standard PCB copper pour and via stitching under the body for thermal management. No solder paste or thermal pad layout is required beyond standard IPC-7351B land pattern.

Does PI3B3257LEX support hot-swap insertion while powered?

Yes-when used per Diodes' Power-Supply Sequencing guidelines: V_CC and GND must be stable before applying any signal to E, S, or I/Y pins. The rail-to-rail input tolerance (–0.5 V to +4.6 V) and absence of input clamping diodes to V_CC enable safe hot-plug operation in properly sequenced backplane or modular systems.

PI3B3257LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Multiplexer/Demultiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

PI3B3257LEX FAQ

1.How can I place an order for PI3B3257LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3B3257LEX 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 PI3B3257LEX reliable?

The price and inventory of PI3B3257LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3257LEX is usually 5 days.

3.What payment methods are accepted for PI3B3257LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3257LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3B3257LEX?

PI3B3257LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3B3257LEX 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 PI3B3257LEX?

For technical support, including PI3B3257LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3257LEX requirements.

6.How does Aetrix verify that PI3B3257LEX is sourced from the original manufacturer or authorized distributors?

All PI3B3257LEX 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 PI3B3257LEX meets industry standards.

7.What is the process for return or replacement of PI3B3257LEX?

All PI3B3257LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3257LEX, 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 PI3B3257LEX part is unused and in its original packaging.

Return procedure for PI3B3257LEX:

1.Submit a request within 90 days.

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

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