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Technical Data Sheet

273914-B21 — Cache Module Specs

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HPE · CONTROLLER · RAID_CACHE
WHAT YOU NEED TO KNOW
RAID cache modules — check if the battery is included and verify cache size. Ship unlocked and with test reports. Firmware must match the server. Key checks: Ship with test reports. Ship UNLOCKED.
Firmware must match server
PRODUCT OVERVIEW

The HP 273914-B21 is a Battery-Backed Write Cache pack, designed for HPE Smart Array controllers in ProLiant Gen8 and Gen9 servers. It provides backup power to the BBWC module during unexpected power loss, ensuring cached write data is safely committed to flash memory. This is a high-volume replacement part in TPM market as ProLiant Gen8 and Gen9 servers remain widely deployed.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-543-2853, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
CONTROLLER RAID_CACHE 273914-B21
NSN: 5998-01-543-2853
FSC: 5998 — CIRCUIT CARD ASSEMBLY
CAGE: 65685 — COMPAQ COMPUTER CORP. (USA)
SPECIFICATIONS
InterfacePCI Express
RAID levels0, 1, 0+1, 5
SSD supportNo
Host interfacePCI Express x8
Channels quantity4 channels
Supported storage drive interfacesSerial ATA
NSN5998-01-543-2853
COMPONENT DIAGRAM
CAP 72V + - CAP 72V BRACKET TO CTRL CABLE: — ~76 mm CACHE BACKUP | Supercapacitor | Cable: — Connects to RAID controller | | Controller: See controller spec SCHEMATIC: + - 2S2P SUPERCAP PACK TITLE CACHE BATT PN 273914-B21 MFR HPE HPE SmartArray 6404 RAID controller PCI
KEY FEATURES
Battery-Backed Write Cache Module
Rechargeable Battery Technology
Provides cache backup power for 48+ hours after power loss
Hot-Plug Capable
TYPICAL APPLICATIONS
  • Hardware RAID acceleration for enterprise storage
  • Data protection and parity management
  • Cache-backed write acceleration
  • Storage tiering and SSD caching
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONSERVER ML570R
END ITEM IDENTIFICATIONSERVER ML570R
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
SMART ARRAY 6404/256Interchangeable
Same NIIN cross-reference
interchangeable
A9891ACompatible
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller for Integrity
compatible
AB363ACompatible
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller for Integrity
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMATSourcing: other
THIS PART SUBSTITUTES FOR 2
A9891ASUBSTITUTE
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller
HPE
AB363ASUBSTITUTE
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller
HPE
RELATED PARTS 1
394791-B21
CIRCUIT CARD ASSEMBLY
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FREQUENTLY ASKED QUESTIONS
What is 273914-B21?
273914-B21 is a HPE SmartArray 6404 RAID controller PCI Express x8 manufactured by HPE. It is classified as a CONTROLLER (RAID_CACHE).
What parts can replace 273914-B21?
There are 3 known substitutes for 273914-B21: SMART ARRAY 6404/256, A9891A, AB363A. Substitute compatibility should be verified for your specific system.
What is the NSN for 273914-B21?
273914-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-543-2853. This indicates validated use in U.S. government and defense supply chains.
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