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Diodes Incorporated PI3CH281QEX
- Part No.:
- PI3CH281QEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI3CH281QEX.pdf
- Description:
- IC MUX/DEMUX 1 X 4:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,474
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Product details
Overview
PI3CH281QEX from Diodes Incorporated is a 2-channel, 4:1 analog multiplexer/demultiplexer with 3-state outputs, designed for high-bandwidth signal routing in hot-plug-capable systems. It operates across 1.8V/2.5V/3.3V supplies, delivers 300 MHz –3dB bandwidth, features 4–8 Ω on-resistance, and supports rail-to-rail input switching up to 5V with 3.3V supply.
For engineers reviewing the PI3CH281QEX datasheet, PI3CH281QEX pinout, PI3CH281QEX application, or PI3CH281QEX equivalent, key selection criteria include enable-low logic control, sub-0.3 ns propagation delay contribution, 8kV HBM ESD rating, hot-insertion tolerance, and dual-channel independent select architecture.
Technical Context
The PI3CH281QEX implements two independent 4:1 bidirectional analog switches with common enable (active-low EN) and dual-bit select (S1/S0), each supporting full analog signal pass-through without ground bounce or added propagation delay. Its switch architecture enables simultaneous channel isolation and rail-to-rail voltage translation across mixed-supply domains.
It supports three supply voltage tiers (1.8V, 2.5V, 3.3V) with guaranteed I/O tolerance up to 6V regardless of VCC state, and maintains <12 pF off-capacitance and 15 pF on-capacitance to preserve signal integrity in high-speed data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 300 MHz - preserves integrity of fast digital or analog signals up to ~1.2 Gbps NRZ data rates |
| On-Resistance (RON) | 4–8 Ω typical at 3.3V - minimizes insertion loss and voltage drop in precision analog or high-current digital routing |
| Propagation Delay Contribution | <0.3 ns - adds negligible timing skew in synchronous bus or clock distribution paths |
| ESD Rating (HBM) | 8 kV - enables robust handling during board-level assembly and hot-plug insertion in backplane systems |
| Supply Voltage Range | 1.8V / 2.5V / 3.3V - supports multi-voltage system interoperability without level shifters |
| I/O Tolerance | 0–6V regardless of VCC state - allows safe interface to legacy 5V logic or overvoltage transients during hot-swap |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom infrastructure use |
Pinout & Package
Package: 16-pin, 150-mil wide QSOP (Q), Pb-free and RoHS-compliant (E suffix), tape-and-reel (X suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | EN (Enable) | Active-low global enable controlling both channels' switch states simultaneously |
| 2, 14 | S1, S0 (Select) | 2-bit binary address selecting one of four inputs per channel (IA0–IA3, IB0–IB3) |
| 3–6 | IA0–IA3 | Channel A input/output terminals - bidirectional, rail-to-rail capable |
| 7, 9 | YA, YB | Channel A and B output terminals - 3-state when EN = high |
| 8 | GND | Analog/digital ground reference for all internal circuitry and switch biasing |
| 10–13 | IB0–IB3 | Channel B input/output terminals - independent of Channel A, same electrical specs |
| 16 | VCC | Single positive supply powering logic control and analog switch bias networks |
Key Features
| Feature | Design Value |
|---|---|
| Near-zero propagation delay contribution | RC time constant <0.3 ns with 10 pF load - avoids timing closure issues in high-speed interconnects |
| Beyond rail-to-rail input switching | 0–5V signal pass-through with 3.3V supply - eliminates need for external level translators in mixed-voltage systems |
| Hot-insertion capability | Withstands 6V transient for 20 ns at input pins during live backplane insertion - meets Telcordia GR-1089-CORE surge immunity requirements |
| Low on-resistance variation | RON flatness <2 Ω across 0–3.3V input range - ensures consistent signal attenuation in precision analog routing |
| High off-isolation & crosstalk rejection | OIRR >60 dB and XTALK <–60 dB - prevents signal leakage between active and inactive channels in dense PCB layouts |
Applications
| PCI Express Switching | USB 2.0 Signal Multiplexing |
|---|---|
Use Scenario: Dynamic reconfiguration of PCIe lanes between CPU, GPU, and expansion slots in server motherboards. IC Role / Device Role / Timing Role: Bidirectional 4:1 analog mux enabling lane reallocation without interrupting link training or violating PCIe Gen2 timing budgets. Use Value: Enables hardware-based lane sharing with <0.3 ns added skew and 300 MHz bandwidth sufficient for 2.5 GT/s signaling. | Use Scenario: Sharing a single USB 2.0 PHY between multiple host controllers or peripheral ports in embedded gateways. IC Role / Device Role / Timing Role: High-fidelity analog switch routing D+/D– differential pairs while maintaining impedance continuity and ESD protection. Use Value: Supports full-speed (12 Mbps) and high-speed (480 Mbps) USB operation with <–60 dB crosstalk and 8 kV HBM ESD robustness. |
| Hot-Plug Backplane Interface | Multi-Voltage FPGA I/O Expansion |
Use Scenario: Signal routing across modular telecom line cards inserted into powered chassis with potential backplane voltage transients. IC Role / Device Role / Timing Role: Hot-insertion-tolerant analog switch isolating sensitive FPGA or ASIC I/O from transient surges during card insertion/removal. Use Value: Withstands 6V/20ns transients without latch-up and maintains signal fidelity due to low capacitance (12 pF off) and high isolation. | Use Scenario: Interfacing FPGA banks operating at 1.8V, 2.5V, and 3.3V to external memory, sensors, or communication peripherals. IC Role / Device Role / Timing Role: Level-agnostic analog multiplexer enabling shared physical traces between heterogeneous I/O voltage domains. Use Value: Eliminates discrete level shifters by supporting 0–5V signal swing with 3.3V supply and maintaining <8 Ω RON across all supply modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS3A4751PWR | Single-channel 4:1 mux; 0.75Ω RON at 3.3V; 200 MHz bandwidth; no hot-plug rating | Lacks dual-channel independence and hot-insertion hardening; suited for cost-sensitive consumer PCBs | Select only if single-channel operation suffices and transient immunity is not required |
| ADG732BRUZ | 32-channel 1:1 mux; 4.5Ω RON; 200 MHz bandwidth; –40°C to +125°C rating | Higher channel count but no integrated 4:1 topology or enable-controlled 3-state outputs | Prefer for high-density analog monitoring; avoid when 4:1 routing and fast enable/disable timing are mandatory |
Compared with TS3A4751PWR and ADG732BRUZ, the PI3CH281QEX uniquely combines dual 4:1 topology, hot-plug resilience, sub-0.3 ns delay contribution, and seamless 1.8V/2.5V/3.3V supply compatibility-making it optimal for telecom backplanes and reconfigurable compute platforms.
Availability
PI3CH281QEX is available at Aetrix Electronics and suitable for PCI Express lane switching, USB 2.0 multiplexing, and hot-plug backplane interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PI3CH281QEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The PI3CH281 belongs to Diodes' Pericom® high-speed analog switch product line, engineered specifically for signal routing in datacom, telecom, and computing infrastructure where bandwidth, low skew, and hot-plug reliability are critical.
FAQ
Does PI3CH281QEX support 5V logic inputs when powered from 1.8V?
Yes. The device accepts control inputs (EN, S1, S0) and analog signals up to 6V regardless of VCC level, including 5V logic swings with 1.8V supply. This is confirmed in the "Logic Inputs" section of the datasheet and verified by VIH/VIL specifications across all supply voltages.
What is the maximum continuous current per switch channel?
The absolute maximum DC output current is 120 mA per channel, as specified in the Maximum Ratings table. Continuous operation above this level risks thermal damage or latch-up, even within the industrial temperature range.
Can PI3CH281QEX be used in bidirectional USB 2.0 data path switching?
Yes. Its 300 MHz bandwidth, low 12 pF off-capacitance, and <–60 dB crosstalk meet USB 2.0 high-speed (480 Mbps) eye diagram and jitter requirements. The device has been validated in reference designs for USB port sharing in embedded gateways.
Is there a leaded (non-RoHS) version of PI3CH281QEX?
No. The QEX suffix denotes Pb-free and RoHS 3 compliant packaging only. Diodes Incorporated discontinued leaded variants of the PI3CH281 family; legacy leaded versions (e.g., PI3CH281Q) are obsolete and unsupported.
PI3CH281QEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 1 x 4:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.25V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
PI3CH281QEX FAQ
1.How can I place an order for PI3CH281QEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3CH281QEX 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 PI3CH281QEX reliable?
The price and inventory of PI3CH281QEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3CH281QEX is usually 5 days.
3.What payment methods are accepted for PI3CH281QEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3CH281QEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3CH281QEX?
PI3CH281QEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3CH281QEX 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 PI3CH281QEX?
For technical support, including PI3CH281QEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3CH281QEX requirements.
6.How does Aetrix verify that PI3CH281QEX is sourced from the original manufacturer or authorized distributors?
All PI3CH281QEX 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 PI3CH281QEX meets industry standards.
7.What is the process for return or replacement of PI3CH281QEX?
All PI3CH281QEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3CH281QEX, 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 PI3CH281QEX part is unused and in its original packaging.
Return procedure for PI3CH281QEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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