Replacement for QDD-400G-FR4-S: Drop-In Alternatives We Stock
Looking for a replacement for the QDD-400G-FR4-S (QDD-400G-FR4-S - Cisco 2km 1310nm 400GBASE-FR4 LC Single-mode QSFP-DD Optical Transceiver Module)? Pro Disk Network ships Cisco drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the QDD-400G-FR4-S
| SKU | QDD-400G-FR4-S |
|---|---|
| Product | QDD-400G-FR4-S - Cisco 2km 1310nm 400GBASE-FR4 LC Single-mode QSFP-DD Optical Transceiver Module |
| Stock status | In Stock |
| Detail page | View QDD-400G-FR4-S › |
Drop-in replacements for QDD-400G-FR4-S
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
QSFP-100G-SM-SR - Cisco Single-Mode 100Gbps 100GBase-CWDM4 Fiber 2km 1310nm LC Connector QSFP Transceiver Module
SKU: QSFP-100G-SM-SR
Price: $6,843.83
QSFP-100G-CWDM4-S - Cisco 100Gb/s 100GBase-CWDM4 Single-Mode Fiber 2km 1330nm Duplex LC Connector QSFP Transceiver Module
SKU: QSFP-100G-CWDM4-S
Price: $1,079.46
Cisco WSP-Q40GLR4L 40Gb/s 40GBase-LR4L Single-Mode Fiber 2km 1310nm Duplex LC Connector QSFP+ Transceiver Module Spare
SKU: WSP-Q40GLR4L
Price: $726.47
QSFP-H40G-AOC7M - Cisco QSFP 40G Active Optical Cable 7m - QSFP-H40G-AOC7M
SKU: QSFP-H40G-AOC7M
Price: $449.70
QSFP-4x10G-AOC7M - Cisco QSFP to 4 x SFP Active Optical Cable 7m - QSFP-4x10G-AOC7M
SKU: QSFP-4X10G-AOC7M
Price: $549.32
Cisco QSFP-40G-ER4 Single-mode 40Gbps 40GBase-ER4 Fiber 40km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40G-ER4
Price: $309.89
QSFP-40G-LR4-S - Cisco 40Gb/s 40GBase-LR4 Single-Mode Fiber 10km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40G-LR4-S
Price: $839.17
QSFP-40GE-LR4 - Cisco 40Gb/s 40GBase-LR4 Single-Mode Fiber 10km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40GE-LR4
Price: $1,071.76
QSFP-40GE-LR4-RF - Cisco 40Gb/s 40GBase-LR4 Single-Mode Fiber 10km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40GE-LR4-RF
Price: $1,071.76
QSFP-40G-LR4-RF - Cisco Single-mode 40Gbps 40GBase-LR4 Fiber 10km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40G-LR4-RF
Price: $1,071.76
QSFP-40GE-LR4-S - Cisco 40Gbps 40GBase-LR4 Single-Mode Fiber 10km 1310nm Duplex LC Connector QSFP+ Transceiver Module
SKU: QSFP-40GE-LR4-S
Price: $1,418.79
QSFP-100G-PSM4-S - Cisco Single-Mode 100Gbps 100GBase-PSM4 Fiber 500m 1310nm MPO-12 Connector QSFP Transceiver Module
SKU: QSFP-100G-PSM4-S
Price: $1,645.93
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.