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Technical Data Sheet
PartsTable / CONTROLLER / A841
A841 ✓ Verified by PartsTable
— · 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 the manufacturer A841 is a Battery-Backed Write Cache pack, designed for enterprise RAID controllers in enterprise 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 enterprise servers remain widely deployed.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-511-6224, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
CONTROLLER→ RAID_CACHE→ A841
NSN: 6625-00-511-6224
FSC: 6625
CAGE: 39739 — SCOTT FETZER COMPANY, THE DBA MERIAM PROCESS TECHNOLOGIES DIV MERIAM INSTRUMENT (USA)
SPECIFICATIONS
materialCOPPER ALLOY RETAINER
end_styleSPRING END,PLAIN BOTH ENDS
load_rating0.140 POUNDS MINIMUM AND 0.210 POUNDS MAXIMUM LBS
coil_quantity22
alignment_typeRIGID
overall_height0.8070 INCHES NOMINAL IN
surface_finishGROUND
inside_diameter0.167 INCHES NOMINAL IN
special_featuresBRONZE FERRULE ON ID OF ONE WASHER,WASHERS OVERLAP
style_designatorCYLINDRICAL
spring_free_length1.562 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND
NSN6625-00-511-6224
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 A841 MFR OEM IBM SAS 6Gb 3-Port PCIe2 x8 1.5GB Cache
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
E2265PC54Interchangeable
interchangeable cross-reference
interchangeable
E2929PC54Interchangeable
interchangeable cross-reference
interchangeable
E739PC96Interchangeable
interchangeable cross-reference
interchangeable
3005-200-1W3-4PC15Interchangeable
interchangeable cross-reference
interchangeable
A841Interchangeable
interchangeable cross-reference
interchangeable
109Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A841?
A841 is a IBM SAS 6Gb 3-Port PCIe2 x8 1.5GB Cache RAID Adapter. It is classified as a CONTROLLER (RAID_CACHE).
What parts can replace A841?
There are 14 known substitutes for A841: E2265PC54, E2929PC54, E739PC96 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A841?
A841 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-511-6224. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026