PI7C9X2G404SLQ - PCIe 2.0 4-Port Packet Switch AEC-Q100 | Diodes
MPN: PI7C9X2G404SLQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.8 | $11.80 |
| 10 | $10.62 | $106.20 |
| 100 | $9.05 | $905.00 |
| 500 | $8.14 | $4,070.00 |
| 1,000 | $7.32 | $7,320.00 |
PI7C9X2G404SLQ Overview
A PCI Express packet switch is a switching fabric device that expands a single upstream PCIe root-port link into multiple downstream ports, allowing one host controller to communicate with several endpoints simultaneously. Within the system hierarchy, it sits between the PCIe controller (root complex) and endpoint devices, forming part of the interconnect layer of a computing or embedded platform alongside bridges and retimers.
Key features of the PI7C9X2G404SLQ include its SlimLine low-power architecture, four-port/four-lane PCIe Gen2 topology, AEC-Q100 automotive qualification, and Pb-free green manufacturing. These attributes make it well suited to designs where lane count is limited but multiple PCIe endpoints must be supported, and where extended temperature and reliability requirements apply.
Technically, the device belongs to the Pericom PI7C9X2G404SL packet-switch family (Diodes acquired Pericom Semiconductor). The SL (standard) and SLQ (automotive/qualified) variants share the same silicon architecture and SlimLine package; the SLQ variant is specifically characterized and qualified for automotive deployment. Compliance with the PCI Express Base Specification enables interoperability with standard root complexes and endpoints without custom drivers.
Typical applications include automotive infotainment and telematics platforms, Wi-Fi routers and gateways, embedded industrial systems, storage controllers, HBAs, combo cards, and printers, where a cost-effective PCIe fan-out is required.
A key design consideration: confirm lane allocation across the four downstream ports, since the device provides four lanes total; heavily loading one port with all four lanes starves the remaining ports. Verify power budget and reference-clock distribution per the manufacturer datasheet.
This page synthesizes verified manufacturer data, drop-in alternatives, application guidance, and practical design notes not found in a single datasheet or distributor listing.
Drop-in alternatives for PI7C9X2G404SLQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PI7C9X2G404SL
✅ Drop-In📋 Reference alternative (not in catalog)
PI7C9X2G404SLBFDEX
✅ Drop-In📋 Reference alternative (not in catalog)
PI7C9X2G404SLQ Maximum Ratings & Electrical Characteristics
| Product Type | PCI Express Packet Switch |
| PCIe Specification | PCI Express 2.0 |
| Number of Ports | 4 |
| Number of Lanes | 4 |
| Package | 128-LQFP (14x14 mm) |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| RoHS / Lead Free | Pb-free, green compliant |
| Architecture | SlimLine low-power packet switch |
| Family | PI7C9X2G404SL family (Pericom / Diodes) |
| Mounting Type | Surface Mount |
PI7C9X2G404SLQ 128-lqfp (14x14 mm) Pin Configuration Guide
Pin configuration for PI7C9X2G404SLQ (128-lqfp (14x14 mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for PI7C9X2G404SLQ.
Refer to the datasheet for full pin configuration.
Typical Applications
PI7C9X2G404SLQ is suitable for 6 applications: Automotive Infotainment and Telematics, Wi-Fi Router and Gateway, Embedded Industrial Systems, Storage Systems and HBAs, Printers and Office Equipment, Combo Cards and Set-Top Boxes.
Automotive Infotainment and Telematics
The PI7C9X2G404SLQ was designed specifically for automotive platforms, being AEC-Q100 qualified per the Diodes product page. In an infotainment head unit or telematics gateway, the SoC often exposes only a single upstream PCIe link, yet must serve several endpoints such as a Wi-Fi/Bluetooth combo module, a Gigabit Ethernet controller for V2X, and NVMe or SD storage for map data. The switch fans that single link out to four x1 downstream ports within a slimline low-power envelope, which matters in sealed automotive cabins with limited airflow. Because it is a Gen2 packet switch, each x1 downstream port delivers the full PCIe 2.0 per-lane bandwidth to its endpoint, but total upstream bandwidth is shared, so designers should budget aggregate throughput against the upstream link width. Pb-free green manufacturing supports automotive environmental compliance requirements.
Recommended
Wi-Fi Router and Gateway
Per the Diodes product description, Wi-Fi router and gateway applications are primary targets for the PI7C9X2G404SL family. Home and enterprise gateways frequently pair a single PCIe root-port link from the main SoC with several wireless and wired endpoints - 802.11ac/ax client modules, LTE/5G modem cards, and additional Ethernet MACs. The PI7C9X2G404SLQ provides 4 ports on 4 lanes, letting each endpoint keep a dedicated x1 Gen2 link, which prevents the arbitration and re-enumeration complexity of daisy-chained bridges. The SlimLine low-power architecture keeps standby power low, an important metric for always-on router platforms, and the 14x14 mm LQFP fits compact PCB areas. In gateways destined for automotive or rugged deployments, the SLQ variant adds AEC-Q100 qualification over the standard SL part.
Recommended
Embedded Industrial Systems
The Diodes product description explicitly lists embedded systems among target implementations for the PI7C9X2G404SL family. Industrial controllers, machine-vision nodes, and edge-computing boxes commonly need to attach a mix of frame grabbers, industrial Ethernet MACs, and SSD storage to a single PCIe-capable CPU module. The PI7C9X2G404SLQ expands one upstream link into four endpoint ports while occupying only a 128-pin LQFP (14x14 mm) footprint, easing layout on dense carrier boards. Choosing the SLQ variant brings AEC-Q100-level qualification discipline into industrial environments subject to vibration and extended temperature, providing margin beyond consumer-grade parts. Designers should verify that the shared 4-lane upstream bandwidth satisfies aggregate endpoint throughput and confirm power sequencing and reference-clock distribution against the manufacturer datasheet.
Recommended
Storage Systems and HBAs
Storage and HBA (host bus adapter) applications are named targets in the Diodes product description for the PI7C9X2G404SL family. A storage controller or add-in card may need to present several device ports - NVMe drives, SATA controller silicon, or enclosure management endpoints - while the host connector provides limited lane count. The PI7C9X2G404SLQ fans a 4-lane upstream out across four ports so each storage endpoint receives a dedicated PCIe 2.0 x1 link, simplifying enumeration and hot-plug handling at the port level. The SlimLine low-power design is valuable in dense storage shelves where thermal budgets are tight. For enterprise storage requiring automotive-grade reliability screening, the SLQ variant offers AEC-Q100 discipline; consumer NAS designs can use the commercial SL variant at lower cost.
Recommended
Printers and Office Equipment
Printers are explicitly listed in the Diodes product description as target systems for the PI7C9X2G404SL family. Modern multifunction printers attach multiple PCIe peripherals - Wi-Fi/print-server modules, USB host controllers, and storage for print queues - behind a single SoC PCIe root port. The PI7C9X2G404SLQ expands that link to four ports on its four lanes, letting each peripheral hold a dedicated x1 Gen2 connection and avoiding the driver complexity of cascaded bridges. The SlimLine low-power architecture supports ENERGY STAR-oriented power budgets, and the 14x14 mm LQFP suits the compact mainboards typical of office equipment. Office printers are rarely automotive applications, so the commercial PI7C9X2G404SL variant is usually the correct choice, with the SLQ reserved for any ruggedized or transportation-related derivatives.
Recommended
Combo Cards and Set-Top Boxes
The Diodes product description lists combo cards, HBAs, and set-top boxes among the implementation targets for the PI7C9X2G404SL family. A combo card - for example a Wi-Fi plus Bluetooth plus storage module - plugs a single x1 or x2 host edge connector but internally carries several endpoint devices; the PI7C9X2G404SLQ provides the on-card fan-out to four ports on four lanes so each function enumerates as its own PCIe endpoint. In set-top boxes, the switch connects tuner/demodulator cards, Wi-Fi modules, and storage behind a single SoC link. The SlimLine low-power design keeps card power within host-slot budgets, and the compact 128-pin LQFP (14x14 mm) fits add-in-card footprints. For any in-vehicle set-top or telematics derivative, select the AEC-Q100-qualified SLQ variant.
Recommended
Recommended Products Summary
Engineering reference data for PI7C9X2G404SLQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PI7C9X2G404SL | PI7C9X2G404SLBFDEX |
|---|---|---|---|
| Package | 128-LQFP (14x14 mm) | 128-LQFP (14x14 mm) - same footprint | 128-LQFP (14x14 mm) - same footprint |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| PCIe Specification | PCI Express 2.0 | PCI Express 2.0 | PCI Express 2.0 |
| Ports / Lanes | 4 ports / 4 lanes | 4 ports / 4 lanes | 4 ports / 4 lanes |
| Pb-Free / Green | Yes | Yes | Yes |
| Architecture | SlimLine low-power | SlimLine low-power | SlimLine low-power |
| Target Market | Automotive / embedded | Embedded, router, printer, storage, HBA, set-top box | Embedded / commercial distribution |
Key Differentiators
- AEC-Q100 automotive qualification (vs PI7C9X2G404SL)
- SlimLine low-power architecture in a compact footprint (vs PI7C9X2G404SLBFDEX)
- True port expansion rather than bridging (vs PI7C9X2G404SL)
Design Notes
The PI7C9X2G404SLQ operates at PCIe Gen2 (5.0 GT/s) signaling on all four lanes. Route each TX/RX pair as 100-ohm differential impedance, keep within-pair skew minimal, and keep AC coupling capacitors close to the transmitter per PCIe card electromechanical conventions. Avoid stubs on lane nets; via transitions should use return vias where signals change layers. Reference clock distribution (100 MHz) should be a single low-jitter source fanned out with matched length to the switch and all downstream endpoints to limit spread-spectrum-clocking mismatch issues.
The SlimLine architecture is optimized for low power, but total consumption depends on link width, activity, and enabled ports. Decouple each supply pin per the manufacturer datasheet with bulk plus high-frequency ceramic capacitance placed at the LQFP power pins. Verify the upstream link bandwidth budget: 4 lanes are shared across 4 ports, so aggregate downstream throughput cannot exceed the upstream link capacity - size the upstream link (x1 vs x2 vs x4 per platform) against the sum of endpoint traffic before committing the power and thermal design.
The most common substitution error is ordering the PI7C9X2G404SL when the design requires the automotive SLQ variant - the parts share the same package and pinout but differ in AEC-Q100 qualification. Conversely, do not deploy the commercial SL in automotive programs. Also confirm the exact ordering-code suffix (e.g., BFDEX packaging codes) against required temperature grade and moisture-sensitivity level, and obtain configuration-strap settings from the full datasheet rather than the product brief before taping out the board.
Compliance Information
Diodes product pages state the PI7C9X2G404SLQ is AEC-Q100 designed/qualified and meets lead (Pb)-free and green system requirements. REACH and conflict-minerals declarations were not found in the provided data.
