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

Diodes Incorporated PI3CH3257LEX

Name: PI3CH3257LEX
Brand: Diodes Incorporated
SKU: PI3CH3257LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI3CH3257LEX

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: PI3CH3257LEX.pdf

Description:: BUS SWITCH 3V TSSOP-16 T&R 2.5K

Quantity:: RFQ Add To RFQ list

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Inventory:4,780

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Product details

Overview

PI3CH3257LEX from Diodes Incorporated is a 4-channel, 2:1 analog multiplexer/demultiplexer with tri-state outputs, enable-low logic, and hot-plug capability. It operates at 1.8V/2.5V/3.3V supply voltages, delivers 500MHz signal bandwidth, features 4Ω on-resistance, and supports rail-to-rail switching up to 5V with 3.3V supply. It is used in high-speed data routing for PCIe Gen2/USB 2.0 switch applications.

For engineers reviewing the PI3CH3257LEX datasheet, PI3CH3257LEX pinout, PI3CH3257LEX application, or PI3CH3257LEX equivalent, key selection criteria include low propagation delay (0.3ns), sub-6Ω R_ON across voltage rails, 8kV HBM ESD rating, and TSSOP-16 package compatibility with hot-insertion backplane systems.

Technical Context

The PI3CH3257LEX implements four independent bidirectional 2:1 analog switches controlled by a single select line (S) and an active-low enable (EN). Each channel routes either IAx or IBx to Yx based on S state, with all outputs entering high-impedance when EN = HIGH.

Its architecture enables simultaneous switching of four differential or single-ended high-speed signals without ground bounce or added propagation delay - critical for maintaining signal integrity in hot-plug-capable telecom/datacom backplanes and USB 2.0 hub designs operating across 1.8V–3.3V domains.

Key Specifications

Parameter	Value and Actual Design Meaning
Bandwidth	500MHz – supports full-speed USB 2.0 (480Mbps) and PCIe Gen2 signaling without attenuation
R_ON (3.3V)	3.5–6Ω – ensures minimal insertion loss and impedance matching for 50Ω transmission lines
Propagation Delay	0.3ns – negligible timing impact in high-speed serial routing paths
Supply Range	1.8V/2.5V/3.3V – interoperable across mixed-voltage SoC interfaces without level shifters
I/O Tolerance	5V tolerant with V_CC = 0V or active – enables safe hot insertion into live backplanes
ESD Rating	8kV HBM – meets industrial system-level ESD robustness requirements per IEC 61000-4-2

Pinout & Package

PI3CH3257LEX is packaged in a Pb-free, RoHS-compliant 16-pin TSSOP (173-mil wide, L package) with standard JEDEC pinout and top-left corner pin 1 marking.

Pin/Terminal	Circuit Role	Design Meaning
1, 15	S (Select)	Common control input selecting IAx (S=L) or IBx (S=H) for all four channels
2,3,5,6,11,10,14,13	IA0–ID1	Eight analog inputs: two per channel (IA0/IA1, IB0/IB1, etc.)
4,7,9,12	YA–YD	Four analog outputs - each connects to one selected input pair under S/EN control
8	GND	Ground reference for analog and digital circuitry; decoupling required near V_CC
16	EN	Active-low global enable - disables all switches and forces outputs to high-Z when HIGH
15	V_CC	Positive supply (1.8V/2.5V/3.3V); powers internal logic and switch biasing network

Key Features

Feature	Design Value
Near-zero propagation delay	0.3ns typical - preserves edge fidelity in high-speed serial links without timing budget penalty
Beyond rail-to-rail switching	0–5V analog range with 3.3V V_CC - eliminates need for external clamping diodes in mixed-supply systems
Hot insertion capable	Withstands 6V transient on I/O pins during live insertion - essential for modular telecom blade systems
Tri-state outputs with EN	Single-pin global disable forces all Yx outputs to high-Z - prevents bus contention during power sequencing
Low on-resistance flatness	RON variation <1Ω over full signal swing - maintains amplitude consistency across video or data signals

Applications

PCIe Gen2 Switching

USB 2.0 Hub Routing

Use Scenario: Reconfiguring PCIe lanes between CPU and peripheral slots in modular server blades.

IC Role / Device Role / Timing Role: Bidirectional analog mux enabling dynamic lane allocation without protocol-aware logic.

Use Value: 500MHz bandwidth preserves Gen2 eye diagram integrity; 0.3ns delay avoids skew-induced link training failures.

Use Scenario: Sharing a single USB 2.0 upstream port among multiple downstream devices in embedded docking stations.

IC Role / Device Role / Timing Role: High-fidelity analog signal router handling D+/D− differential pairs with minimal crosstalk.

Use Value: –60dB crosstalk and –60dB off-isolation prevent packet corruption; 5V I/O tolerance handles host-side transients.

Hot-Plug Backplane Interface

Multi-Voltage FPGA I/O Expansion

Use Scenario: Interfacing hot-swappable line cards to a powered-backplane in telecom central offices.

IC Role / Device Role / Timing Role: Signal isolation and transient protection element placed at card-edge connector.

Use Value: 8kV HBM ESD and 6V I/O tolerance withstand insertion surges; tri-state mode prevents backfeeding during insertion.

Use Scenario: Expanding FPGA GPIO count by routing 1.8V/2.5V/3.3V I/O banks through shared external peripherals.

IC Role / Device Role / Timing Role: Voltage-domain agnostic analog switch enabling flexible pin multiplexing.

Use Value: Single-supply operation across three logic families eliminates level-shifter ICs; 4Ω R_ON minimizes voltage drop on drive lines.

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TS3A227EYZR	Lower bandwidth (300MHz), higher R_ON (8Ω @ 3.3V), no 1.8V support	Not suitable for PCIe Gen2 or hot-plug systems requiring 500MHz or 1.8V operation	Select only if cost sensitivity outweighs bandwidth and voltage flexibility requirements
ADG732BRUZ	Higher R_ON (4.5Ω min), no 5V I/O tolerance, no hot-plug rating, 32-channel vs. 4-channel	Lacks backplane survivability and USB 2.0 signal fidelity; better suited for low-frequency instrumentation	Prefer only for precision DC-coupled applications where speed and ruggedness are secondary

Compared with TS3A227EYZR and ADG732BRUZ, the PI3CH3257LEX uniquely combines 500MHz bandwidth, 1.8V–3.3V operation, 5V I/O tolerance, and hot-plug readiness - making it the only option qualified for high-speed, mixed-voltage, field-replaceable system architectures.

Availability

PI3CH3257LEX is available at Aetrix Electronics and suitable for PCIe Gen2 switching, USB 2.0 hub routing, and hot-plug backplane interface applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI3CH3257LEX 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 signal integrity, power management, and protection solutions for industrial, computing, and communications markets.

The PI3CH3257LEX belongs to Diodes' Pericom analog switch portfolio, engineered specifically for high-bandwidth, hot-plug-capable data routing in telecom infrastructure, enterprise storage, and modular computing platforms.

FAQ

What is the maximum signal voltage that can be passed through PI3CH3257LEX when V_CC = 3.3V?

The PI3CH3257LEX supports 0–5V analog signal swing with V_CC = 3.3V, enabled by its beyond-rail-to-rail architecture. This allows safe passage of 5V-tolerant signals such as USB D+/D− or legacy parallel bus lines without external clamping, even when the device itself runs at lower core voltage.

Does PI3CH3257LEX require external pull-up or pull-down resistors on the S or EN pins?

No. The PI3CH3257LEX has internally biased control inputs with guaranteed VIH/VIL thresholds across all supply voltages (e.g., VIH = 2.0V min at 3.3V V_CC). External resistors are unnecessary unless system-level noise immunity or fail-safe default states demand them - which is not required for standard hot-plug or PCIe switching use cases.

Can PI3CH3257LEX operate reliably at –40°C ambient temperature?

Yes. The PI3CH3257LEX is specified for industrial temperature range (–40°C to +85°C), with all electrical parameters - including R_ON, bandwidth, and enable/disable timing - fully characterized and guaranteed across this range. Its JESD17 latch-up immunity (>200mA) further ensures robustness in cold-start environments.

Is PI3CH3257LEX pin-compatible with other Pericom 4-channel muxes like PI3CH485?

No. PI3CH3257LEX uses a 16-pin TSSOP with dedicated S and EN pins and eight input terminals (IA0–ID1), while PI3CH485 is a 24-pin QFN with different pin mapping, channel count, and enable logic. Direct replacement requires PCB redesign; functional substitution must account for bandwidth, R_ON, and voltage support differences.

PI3CH3257LEX 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:: 2.97V ~ 3.63V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

PI3CH3257LEX FAQ

1.How can I place an order for PI3CH3257LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI3CH3257LEX 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 PI3CH3257LEX reliable?

The price and inventory of PI3CH3257LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3CH3257LEX is usually 5 days.

3.What payment methods are accepted for PI3CH3257LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3CH3257LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI3CH3257LEX?

PI3CH3257LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI3CH3257LEX 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 PI3CH3257LEX?

For technical support, including PI3CH3257LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3CH3257LEX requirements.

6.How does Aetrix verify that PI3CH3257LEX is sourced from the original manufacturer or authorized distributors?

All PI3CH3257LEX 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 PI3CH3257LEX meets industry standards.

7.What is the process for return or replacement of PI3CH3257LEX?

All PI3CH3257LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3CH3257LEX, 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 PI3CH3257LEX part is unused and in its original packaging.

Return procedure for PI3CH3257LEX:

1.Submit a request within 90 days.

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

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