FREE SHIPPING on Orders Over US$99
About Us

English English

0.5m (2ft) Generic Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
0.5m (2ft) Generic Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
0.5m (2ft) Generic Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
P/N: OSFP-QDD-CU
US$149.00
5
Reviews
2
Questions
safeguard
4-Year Warranty
30-Day Returns
30-Day Exchange
（1000 In Stock）

Product Highlights

Max. Power Consumption 0.1W Per End, and Has Near Zero-latency Delays
Tested in Targeted Switches for Superior Performance, Quality, and Reliability
Simplifies Patching and Offers a Cost-effective Way for Short Links
Hot Pluggable OSFP MSA and QSFP-DD MSA Compliant
Minimum Bend Radius 34.5mm for Flexible Routing
4x 100G PAM4 400GAUI-4 Electrical Interface
Low Insertion Loss and Ultra-low Crosstalk for Improved Performance
See more
Specifications
Q&A
Reviews
Resources
0.5m (2ft) Generic Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
The 400G OSFP to 400G QSFP-DD DAC provides a 400G copper direct-attach solution with a Flat-top (OSFP-RHS) form factor, suitable for very short links and offer a cost-effective way to establish a 400-Gigabit link between 400G ports of switches/routers within racks and across adjacent racks. This DAC is designed with ultra-low loss materials, square rings, twisted pair cable 8 wires and shell extension construction for superior mechanical properties and bending performance. It is tested in actual switching systems to ensure optimal signal integrity and the best end-to-end performance, ideal for SDN, ML, and Cloud Computing.
Note: This 400G QSFP-DD end operates on 4x100G-PAM4 modulation, making it suitable for downspeeding on 800G QSFP-DD switches that support channel disabling (i.e., operating with only 4 lanes enabled). It is not compatible with 400G QSFP-DD switches that use 8x50G-PAM4 modulation.
Specifications
Part Number
OSFP-QDD-CU
Vendor Name
AICPLIGHT
Form Factor
OSFP (Flat Top) to QSFP-DD
Max Data Rate
400Gbps
Media
Copper
Cable Type
Passive Twinax
Cable Length
0.5m (2ft)
Wire AWG
30AWG
Minimum Bend Radius
34.5mm
Power Consumption
≤0.1W
Jacket Material
PVC (OFNR)
Temperature
0 to 70°C (32 to 158°F)
Modulation Technology
OSFP-4x100GPAM4; QDD-4x100GPAM4
Application
400G Ethernet
Protocols
IEEE 802.3cd, OSFP MSA, QSFP-DD MSA, CMIS Rev4.0, SFF-8417
Warranty
5 Years
Certification
Product
Product
Product
Product
Product
Product
Product
Product
Product
Product
Questions & Answers
edit icon Ask a question
All (2) Compatibility (1)Installation (1)
Q:

How should cables be routed in a high-density rack?

by T***m on 2025-07-10 16:02:19

A:

Use cable managers to maintain airflow and prevent bending.

by CPLIGHT on 2025-07-10 16:41:46

like icon Helpful 0
comment icon Comment 0
Q:

Can these transceivers auto-negotiate with older models?

by W***m on 2025-07-10 15:27:53

A:

Yes, backward compatibility is supported in many cases.

by Helpful on 2025-07-10 16:40:25

like icon Helpful 0
comment icon Comment 0
Customer Reviews
edit icon Write a review
All (5) Performance (1)Compatibility (1)Ease of Use (1)Customer Support (1)Value (1)
k
k***m
2025-05-30 19:14:47
Confirmed Purchase
5.0

Plug-and-play experience was excellent. The cables came clean and ready for immediate deployment.

link icon Helpful 0
comment icon Comment 0
v
v***m
2025-05-01 11:45:12
Confirmed Purchase
5.0

High-quality interconnects at a fraction of the price of branded cables. Ideal for scaling AI clusters on a budget.

link icon Helpful 0
comment icon Comment 0
6
6***m
2025-04-26 07:37:02
Confirmed Purchase
5.0

Fully compatible with our NVIDIA ConnectX-6 NICs and Mellanox switches. No firmware warnings or handshake delays.

link icon Helpful 0
comment icon Comment 0
f
f***m
2025-04-23 11:24:13
Confirmed Purchase
5.0

Used in our GPU training pod (8x H100s) to connect each server node. Latency remained sub-microsecond, even with large tensor workloads.

link icon Helpful 0
comment icon Comment 0
R
R***m
2025-04-18 00:04:18
Confirmed Purchase
5.0

We had a shipping delay and the support team took ownership and resolved it quickly with a courier reroute.

link icon Helpful 0
comment icon Comment 0
Explore Our Extended Product Line