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Diodes Incorporated PI3EQX8908A2ZFEX
- Part No.:
- PI3EQX8908A2ZFEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Buffers, Repeaters, Splitters
- Package:
- 54-WFQFN Exposed Pad
- Datasheet:
-
PI3EQX8908A2ZFEX.pdf
- Description:
- PCIE EQX W-QFN55100-54 T&R 3.5K
- Quantity:
- Payment:
- Shipping:
Inventory:3,356
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Product details
Overview
PI3EQX8908A2ZFEX from Diodes Incorporated is an 8-channel PCIe ReDriver IC supporting 2.5/5.0/8.0 Gbps serial links with linear equalization, programmable receiver EQ, output swing, and flat gain per channel. It features 54-pin TQFN packaging, 3.3 V ±0.3 V supply, and operates from −40 °C to +85 °C. Used in high-speed motherboard interconnects to restore degraded PCIe Gen 1/2/3 signals across long traces or connectors.
For engineers reviewing the PI3EQX8908A2ZFEX datasheet, PI3EQX8908A2ZFEX pinout, PI3EQX8908A2ZFEX application, or PI3EQX8908A2ZFEX equivalent, key selection criteria include per-channel linear equalization tuning, EEPROM-based configuration persistence, CML I/O compatibility, PCIe Link Training compliance, and industrial temperature operation without external microprocessor dependency.
Technical Context
The PI3EQX8908A2ZFEX implements a fully linear transfer function to preserve PCIe 3.0 Link Training waveform integrity, avoiding nonlinear distortion that could disrupt training sequences. Its eight independent differential channels each support configurable input termination (50 Ω or 200 kΩ to VDD) and output termination detection (50 Ω to VDD or high-impedance).
Configuration is supported via pin strapping, I²C master/slave interface with 4-bit address select, or autonomous loading from external EEPROM at power-up-eliminating software driver or host processor involvement. It accepts 100 Ω differential CML inputs and drives matched CML loads with programmable gain and swing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 2.5 / 5.0 / 8.0 Gbps - supports full PCIe Gen 1/2/3 backward-compatible signaling on each channel. |
| Channel Count | 8 independent differential channels - enables full x8 PCIe lane re-timing without multiplexing or sharing. |
| Equalization Type | Linear equalization only - preserves Link Training eye symmetry and avoids ISI overcompensation artifacts. |
| Supply Voltage | 3.3 V ±0.3 V - compatible with standard PCIe auxiliary and main rail supplies; no LDO required. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial motherboard and server backplane environments. |
| I/O Interface | 100 Ω differential CML - matches native PCIe physical layer impedance and voltage swing requirements. |
| Configuration Modes | Pin strap, I²C (4-bit address), or EEPROM auto-load - enables flexible integration with or without host firmware involvement. |
Pinout & Package
Package: 54-contact, 7 mm × 4.5 mm, 0.5 mm pitch, Very Thin Quad Flat No-Lead (TQFN), Pb-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3 V core supply for all 8 channels; decoupling required per channel group. |
| GND | Ground reference | Multiple dedicated ground pins distributed across package for low-inductance return paths. |
| CHx_IN+, CHx_IN− | Differential data input | Accepts degraded CML signals; internal 50 Ω or 200 kΩ selectable termination to VDD. |
| CHx_OUT+, CHx_OUT− | Differential data output | Drives restored CML signal; output termination auto-detected as 50 Ω to VDD or high-Z. |
| SCL, SDA | I²C interface | Supports master or slave mode; 4-bit device address selection enables multi-device bus topology. |
| EEPROM_CLK, EEPROM_DATA | External EEPROM interface | Loads configuration at power-up; eliminates need for host initialization sequence. |
| EN, MODE[1:0] | Enable and configuration mode select | Hardware pin-strapping sets default EQ/gain/swing; overrides I²C or EEPROM if asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Fully linear transfer function | Preserves PCIe Link Training eye opening and timing margins without introducing nonlinear jitter or distortion. |
| Per-channel EQ, swing, and gain control | Enables independent optimization of each lane's signal integrity based on individual trace loss profiles. |
| Autonomous EEPROM configuration load | Eliminates boot-time firmware dependency; configuration applied before host PCIe enumeration begins. |
| Single-ended mode receiver detection | Automatically detects PCIe receiver presence and adjusts input threshold accordingly for robust link negotiation. |
| Input threshold detection | Monitors input signal level to validate link readiness prior to equalization activation. |
Applications
| Server Backplane Interconnect | Workstation PCIe Expansion |
|---|---|
Use Scenario: Extending PCIe Gen 3 x8 links across 150 mm+ FR4 backplane traces with >15 dB channel loss. IC Role / Device Role / Timing Role: Linear ReDriver restoring eye height and jitter margin without altering link training behavior. Use Value: Enables reliable x8 GPU or NVMe add-in card connectivity without redesigning stackup or adding mid-board repeaters. | Use Scenario: Supporting dual-slot PCIe expansion in compact workstation chassis with tight routing constraints. IC Role / Device Role / Timing Role: Per-lane equalization compensating for asymmetric trace lengths between slots. Use Value: Maintains Gen 3 compliance across both slots despite differential skew up to 12 ps per lane pair. |
| Embedded AI Accelerator Carrier | Industrial PCIe Data Acquisition |
Use Scenario: Routing PCIe Gen 3 signals from CPU to FPGA-based AI accelerator module over flex-rigid PCB. IC Role / Device Role / Timing Role: CML-to-CML ReDriver with EEPROM-configured settings surviving thermal cycling. Use Value: Eliminates need for FPGA-side configuration logic; stable operation across −40 °C to 85 °C ambient. | Use Scenario: Connecting high-speed digitizer cards to industrial controller via extended PCIe riser cables. IC Role / Device Role / Timing Role: Linear equalization counteracting cable-induced frequency-dependent attenuation. Use Value: Restores 8.0 Gbps eye opening to >0.3 UI at receiver, enabling sustained 4 GB/s sustained throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe ReDriver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TUSB1002A | USB 3.1 Gen 2 focus; supports only 2 lanes; lacks EEPROM auto-load and per-channel EQ granularity. | Targeted at USB-C docking, not PCIe infrastructure; no PCIe Link Training compliance validation. | Choose only for USB-centric designs requiring integrated USB/PCIe coexistence. |
| Maxim MAX96752 | GMSL2 serializer/deserializer; not a ReDriver; requires bidirectional protocol translation and external clocking. | Designed for automotive camera links, not high-speed digital interconnect; incompatible CML I/O structure. | Not suitable for PCIe signal restoration; use only in GMSL2 video transport systems. |
Compared with TI TUSB1002A and MAX96752, the PI3EQX8908A2ZFEX uniquely delivers PCIe Gen 3–compliant linear equalization across eight independent lanes with autonomous EEPROM configuration-enabling drop-in deployment in server, workstation, and industrial PCIe extension without host firmware changes or protocol translation.
Availability
PI3EQX8908A2ZFEX is available at Aetrix Electronics and suitable for server backplane interconnects, workstation PCIe expansion, embedded AI accelerator carriers, and industrial data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for PI3EQX8908A2ZFEX 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 solutions for power management, signal integrity, and connectivity applications.
The PI3EQX8908A2ZFEX belongs to Diodes' high-speed interface product line, engineered specifically to solve PCIe signal degradation in dense, thermally constrained, and long-reach board-level interconnects.
FAQ
Does PI3EQX8908A2ZFEX support PCIe Gen 4?
No. The PI3EQX8908A2ZFEX is specified for 2.5/5.0/8.0 Gbps operation and fully compliant with PCIe Gen 1/2/3 Link Training requirements. It does not meet the 16 Gbps data rate or enhanced equalization specifications required for Gen 4, and its linear transfer function is optimized for Gen 3 eye diagrams.
Can PI3EQX8908A2ZFEX operate with 1.8 V supply?
No. The device requires a nominal 3.3 V supply with ±0.3 V tolerance (3.0 V to 3.6 V). Operation outside this range is not characterized or guaranteed. It is not compatible with 1.8 V I/O domains and lacks internal level-shifting circuitry for lower-voltage interfaces.
Is external EEPROM mandatory for configuration?
No. External EEPROM is optional. Configuration can be set via pin strapping for fixed settings or via I²C interface during system runtime. EEPROM mode provides automatic power-up configuration without host intervention, but it is not required for basic functionality.
What is the maximum trace loss compensation capability?
The PI3EQX8908A2ZFEX achieves up to 15 dB of channel loss compensation at 4 GHz (PCIe Gen 3 Nyquist frequency), as verified by eye diagram measurements in Diodes' reference design documentation. Performance depends on specific layout, connector insertion loss, and termination matching.
PI3EQX8908A2ZFEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- PCI Express®(PCIe), ReDriver™
- Package/Case:
- 54-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Buffer, ReDriver
- Applications:
- PCIe
- Input:
- CML
- Output:
- CML
- Data Rate (Max):
- 8Gbps
- Number of Channels:
- 8
- Delay Time:
- -
- Signal Conditioning:
- Input Equalization, Output De-Emphasis
- Capacitance - Input:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 54-TQFN (10x5.5)
PI3EQX8908A2ZFEX FAQ
1.How can I place an order for PI3EQX8908A2ZFEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3EQX8908A2ZFEX 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 PI3EQX8908A2ZFEX reliable?
The price and inventory of PI3EQX8908A2ZFEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3EQX8908A2ZFEX is usually 5 days.
3.What payment methods are accepted for PI3EQX8908A2ZFEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3EQX8908A2ZFEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3EQX8908A2ZFEX?
PI3EQX8908A2ZFEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3EQX8908A2ZFEX 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 PI3EQX8908A2ZFEX?
For technical support, including PI3EQX8908A2ZFEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3EQX8908A2ZFEX requirements.
6.How does Aetrix verify that PI3EQX8908A2ZFEX is sourced from the original manufacturer or authorized distributors?
All PI3EQX8908A2ZFEX 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 PI3EQX8908A2ZFEX meets industry standards.
7.What is the process for return or replacement of PI3EQX8908A2ZFEX?
All PI3EQX8908A2ZFEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3EQX8908A2ZFEX, 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 PI3EQX8908A2ZFEX part is unused and in its original packaging.
Return procedure for PI3EQX8908A2ZFEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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