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Diodes Incorporated PI3CH3244ZHEX
- Part No.:
- PI3CH3244ZHEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
PI3CH3244ZHEX.pdf
- Description:
- BUS SWITCH 3V W-QFN3545-20
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
PI3CH3244ZHEX from Diodes Incorporated is an 8-bit dual-channel bus switch with two independent low-active enables, supporting 1.8V/2.5V/3.3V logic levels, 4Ω typical on-resistance at 1.8V, 500MHz -3dB bandwidth, and hot-plug capability for PCIe and USB interface isolation in server backplanes.
For engineers reviewing the PI3CH3244ZHEX datasheet, PI3CH3244ZHEX pinout, PI3CH3244ZHEX application, or PI3CH3244ZHEX equivalent, key selection criteria include dual-enable control timing (tPZH up to 25ns at 1.8V), rail-to-rail analog switching, low crosstalk (-60dB), and WQFN-20 package thermal performance for high-density routing.
Technical Context
The PI3CH3244ZHEX implements two independent 4-bit bidirectional analog/digital bus switches, each controlled by a dedicated active-low enable (EN1/EN2). Each channel connects four A-side pins (1A1–1A4, 2A1–2A4) to corresponding B-side pins (1B1–1B4, 2B1–2B4) when enabled, with high-impedance isolation otherwise.
It operates across three supply voltages (1.8V, 2.5V, 3.3V) with guaranteed VIH/VIL thresholds per voltage tier, supports rail-to-rail signal pass-through, and delivers sub-nanosecond propagation delay (0.3ns typ) due to minimal RC time constant (<0.3ns for 10pF load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8V / 2.5V / 3.3V - Supports mixed-voltage domain bridging without level shifters |
| On-Resistance (RON) | 4Ω typ @ 1.8V - Enables <10mV drop at 20mA, critical for low-voltage I²C/SMBus integrity |
| -3dB Bandwidth | 500MHz - Sufficient for USB 2.0 (480Mbps) and PCIe Gen1 (2.5Gbps) signal routing |
| Crosstalk (XTALK) | -60dB @ 10MHz - Prevents coupling-induced jitter in adjacent high-speed data lanes |
| Enable Propagation Delay | 1.5–25.0ns (tPZH) - Matches FPGA I/O timing budgets for dynamic bus partitioning |
| Off-Isolation (OIRR) | -60dB @ 10MHz - Ensures >60dB signal attenuation between disconnected channels |
| Input Capacitance | 2.0pF - Minimizes loading on driving source, preserving edge rate in fanout scenarios |
Pinout & Package
PI3CH3244ZHEX uses a 20-contact WQFN package (3.5mm × 4.5mm, 0.5mm pitch, exposed thermal pad), optimized for thermal dissipation and PCB space efficiency in compact server and storage modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | EN1, EN2 | Active-low enables for Channel 1 and Channel 2 - drive low to connect respective A/B ports |
| 2, 4, 6, 8 | 1A1–1A4 | Channel 1 A-side bidirectional I/O - connect to upstream controller or host side |
| 3, 5, 7, 9 | 2B4–2B1 | Channel 2 B-side bidirectional I/O - reversed pin order matches JEDEC-standard layout |
| 10 | GND | Ground reference - must be connected to low-impedance plane for noise immunity |
| 12, 14, 16, 18 | 1B4–1B1 | Channel 1 B-side bidirectional I/O - reversed pin order for compact routing symmetry |
| 11, 13, 15, 17 | 2A1–2A4 | Channel 2 A-side bidirectional I/O - independent of Channel 1 for dual-bus arbitration |
| 20 | VCC | Single power supply input - powers both channels and internal logic; no separate IOVDD required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Passes signals from GND to VCC without clipping - preserves full logic swing in mixed-signal systems |
| Hot-plug compatible | Supports live insertion/removal of add-in cards while system remains powered - eliminates need for sequencing circuitry |
| Dual independent enables | EN1 and EN2 allow asynchronous control of two 4-bit buses - enables dynamic resource allocation in multi-peripheral systems |
| Low quiescent current | 0.5mA max ICC - reduces standby power in always-on subsystems such as management controllers |
| RoHS 3 & Halogen-free | Compliant with EU Directive 2015/863/EU and Diodes' Green standard (<900ppm Br+Cl) - meets Tier-1 OEM environmental requirements |
Applications
| PCIe Lane Isolation | USB 2.0 Port Multiplexing |
|---|---|
Use Scenario: Dynamic reconfiguration of PCIe x4 links between CPU and NVMe SSDs in modular blade servers. IC Role / Device Role / Timing Role: Bidirectional lane switch enabling physical layer rerouting without protocol stack intervention. Use Value: Achieves <1μs reconfiguration latency and maintains PCIe Gen1 signal integrity (500MHz BW, -60dB crosstalk). | Use Scenario: Sharing a single USB 2.0 controller between front-panel and rear-panel ports in industrial HMIs. IC Role / Device Role / Timing Role: Low-latency analog multiplexer with rail-to-rail pass-through for D+/D− differential pairs. Use Value: Preserves 480Mbps eye diagram margin via 4Ω RON and 2pF CIN, eliminating signal degradation. |
| I²C Bus Expansion | Hot-Swap Backplane Interface |
Use Scenario: Adding isolated I²C segments to monitor multiple PMBus power rails in telecom rectifiers. IC Role / Device Role / Timing Role: Level-shifting bus switch enabling 1.8V sensor nodes to communicate with 3.3V master MCU. Use Value: Guarantees VIH ≥1.2V at 1.8V supply, ensuring reliable logic HIGH recognition across voltage domains. | Use Scenario: Enabling safe insertion of line cards into powered carrier boards in enterprise switches. IC Role / Device Role / Timing Role: Controlled impedance path gate with fast disable (tPLZ ≤12ns) to prevent bus contention during plug events. Use Value: Limits inrush current and avoids glitch propagation via high off-isolation (-60dB OIRR) during transition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit dual-enable bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244CPWR | Higher RON (7Ω min @ 3.3V), no 1.8V support, TSSOP-20 only | Limited to 3.3V-only systems; lacks hot-plug robustness per datasheet test conditions | Select when cost sensitivity outweighs voltage flexibility and thermal performance needs |
| PI3CH4812ZHEX | 12-bit single-channel, same package, higher capacitance (CIN = 3.2pF), 350MHz BW | Better suited for wide-data-path memory expansion; lower bandwidth limits USB 2.0 use | Select when consolidating more signals per channel is prioritized over per-lane isolation granularity |
Compared with SN74CBT3244CPWR and PI3CH4812ZHEX, PI3CH3244ZHEX uniquely balances 1.8V compatibility, 500MHz bandwidth, and dual-channel independence-enabling simultaneous PCIe lane and USB port switching in space-constrained embedded servers.
Availability
PI3CH3244ZHEX is available at Aetrix Electronics and suitable for PCIe lane isolation, USB 2.0 port multiplexing, and hot-swap backplane interface applications requiring stable component supply across industrial, telecom, and enterprise computing programs.
Supply support for PI3CH3244ZHEX 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, with design centers in Asia, Europe, and the U.S., serving industrial, computing, and communications markets.
The PI3CH3244ZHEX belongs to Diodes' high-bandwidth bus switch product line, engineered specifically for signal integrity-critical board-level interconnects in next-generation data center and edge infrastructure.
FAQ
What is the maximum operating temperature range for PI3CH3244ZHEX?
The PI3CH3244ZHEX is rated for ambient operation from –40°C to +85°C with power applied. This range is validated across all supply voltages (1.8V, 2.5V, 3.3V) and supports deployment in uncontrolled environments such as network equipment cabinets and industrial control enclosures without derating.
Can PI3CH3244ZHEX be used for analog signal switching?
Yes - it supports rail-to-rail analog signal pass-through with guaranteed performance up to 500MHz bandwidth and <4Ω on-resistance. Its low capacitance (2.0pF input, 7.0pF on-state) and flat RON vs. voltage curve make it suitable for audio, sensor, and low-speed video signals where DC coupling and minimal distortion are required.
Does PI3CH3244ZHEX require external pull-up resistors on enable pins?
No - EN1 and EN2 have CMOS-compatible input structure with ±1μA leakage across temperature. External pull-ups are optional and only needed if system-level noise immunity requires defined default state; internal logic thresholds (VIH/VIL) are specified per supply voltage and do not rely on external biasing.
How does the thermal pad on the WQFN package affect PCB layout?
Pin 20 (VCC) and the exposed thermal pad share the same potential and must be soldered to a solid copper pour tied to the main ground plane. The pad improves thermal resistance by ~25°C/W and reduces junction-to-board θJB - omission degrades long-term reliability under sustained 120mA per switch operation.
PI3CH3244ZHEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- 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:
- 2.97V ~ 3.63V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4.5x3.5)
PI3CH3244ZHEX FAQ
1.How can I place an order for PI3CH3244ZHEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3CH3244ZHEX 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 PI3CH3244ZHEX reliable?
The price and inventory of PI3CH3244ZHEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3CH3244ZHEX is usually 5 days.
3.What payment methods are accepted for PI3CH3244ZHEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3CH3244ZHEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3CH3244ZHEX?
PI3CH3244ZHEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3CH3244ZHEX 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 PI3CH3244ZHEX?
For technical support, including PI3CH3244ZHEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3CH3244ZHEX requirements.
6.How does Aetrix verify that PI3CH3244ZHEX is sourced from the original manufacturer or authorized distributors?
All PI3CH3244ZHEX 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 PI3CH3244ZHEX meets industry standards.
7.What is the process for return or replacement of PI3CH3244ZHEX?
All PI3CH3244ZHEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3CH3244ZHEX, 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 PI3CH3244ZHEX part is unused and in its original packaging.
Return procedure for PI3CH3244ZHEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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