405-AASU: Dell HBA355e External SAS 12Gb/s Host Bus Adapter
Also listed as: 09N80G, 9N80G · made by Broadcom
The Dell 405-AASU is a Dell HBA355e External SAS 12Gb/s Host Bus Adapter providing 12Gb/s SAS connectivity across 4x External Mini-SAS HD (SFF-8644) via PCIe 4.0 x8 for Dell R750, R650, R760, R660 servers.
Specifications
| Part number | 405-AASU |
|---|---|
| Brand | Dell |
| Made by | Broadcom |
| Type | HBAs |
| Other numbers | 09N80G, 9N80G |
| Status | current |
| Interface | PCIe 4.0 x8 |
| Form factor | FHHL / LPHL PCIe Adapter |
| Ports | 4x External Mini-SAS HD (SFF-8644) |
| Speed | 12Gb/s SAS |
| Tdp (W) | 12 |
About the 405-AASU
The Dell 405-AASU is a Dell HBA355e External SAS 12Gb/s Host Bus Adapter delivering non-RAID SAS pass-through connectivity across 4x External Mini-SAS HD (SFF-8644) over PCIe 4.0 x8. Built with Broadcom SAS controller silicon on the 405-AASU, it provides direct target communication for software-defined storage, JBOD shelves, and tape automation. In Dell's storage ecosystem, 405-AASU enables high-throughput host-to-enclosure data pathways.
Compatibility
The 405-AASU installs into PCIe slots or dedicated storage bays on Dell PowerEdge servers including R750, R650, R760, R660. The 405-AASU connects to internal drive backplanes or external PowerVault enclosures over SAS cabling without RAID volume overhead, enabling software-defined storage stacks to manage drives directly.
How to identify a genuine unit
Authentic Dell 405-AASU SAS HBAs carry a serialized label displaying DP/N 09N80G, SAS controller branding, and Dell regulatory approvals. In iDRAC under Storage Controllers, the 405-AASU adapter identifies as an authentic Dell HBA with active firmware and device mapping.
Buying used
When sourcing a pre-owned 405-AASU, inspect the physical PCIe edge contacts and SAS connector ports for damaged pins. Verify that onboard passive heatsinks on the 405-AASU are firmly seated, and test in iDRAC to confirm that all connected drives enumerate in pass-through mode.
Fits these models
- Dell PowerEdge R750
- Dell PowerEdge R650
- Dell PowerEdge R760
- Dell PowerEdge R660
- Dell PowerVault ME5024
- Dell PowerVault MD1420
Works together
How the Dell 405-AASU connects to servers, storage and the network: 1 way, with the hardware on each path.
Direct-attached SAS
12Gb SAS uses Mini-SAS HD (SFF-8644) connectors; older 6Gb gear uses Mini-SAS (SFF-8088). Adapter cables exist, but the link runs at the slower speed.
Storage
Dell PowerVault ME5012 2U rack
Dell PowerVault ME5024 2U rack
Dell PowerVault ME5084 5U rack
Dell PowerVault MD1200 2U rack
Dell PowerVault MD1220 2U rack
Dell PowerVault MD1400 2U rack
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Add up rack power and space rack-density.com
- LTO tape prices and archive advisor tapebackup.org
- Enterprise backup Ledger: backup software scored mrplanb.com
- LTO tape for backup mrplanb.com
- Dell E-Lab Navigator (Dell interoperability) dell.com
Equivalent part numbers
- Broadcom SAS3816 IT Broadcom SAS3816 16-port 12Gb/s SAS External HBA base
FAQ
How many external storage enclosures can this card connect?
With 16 external SAS lanes across 4 ports, it can connect directly to up to four external storage controllers or daisy-chain multiple JBOD enclosures.
Does the HBA355e support external LTO tape drives?
Yes, it is certified for Dell PowerVault LTO-7, LTO-8, and LTO-9 external tape drives and tape autoloaders.
Buying or selling 405-AASU?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Dell HBA355e Adapter User's Guide, checked 2026-10-27