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5529255-A ✓ Verified by PartsTable
HITACHI · MEMORY · RDIMM
WHAT YOU NEED TO KNOW
Memory is a hot market right now. DDR5 and DDR4 are extremely volatile with data centers driving availability to extreme lows. Always validate machine type and model. Remember: all RAM is Hynix, Samsung, or Micron underneath OEM labels — use that to find alternatives. Key checks: Check OEM alternatives — all RAM is Hynix/Samsung/Micron underneath. Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW
HITACHI 16GB (4X4GB) CACHE MEMORY

HITACHI 16GB (4X4GB) CACHE MEMORY. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MEMORY→ RDIMM→ 5529255-A
SPECIFICATIONS
Part Number5529255-A
ManufacturerHITACHI
Capacity16GB
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 — RDIMM HITAC NOTCH ~133.35 mm DDR4 RDIMM | 16GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 5529255-A MFR HITACHI 16GB —
KEY FEATURES
•
16GB Capacity
TYPICAL APPLICATIONS
  • Server memory expansion for virtualization workloads
  • Database performance optimization (in-memory computing)
  • VDI and remote desktop session hosting
  • High-performance computing (HPC) clusters
  • Mail server and collaboration platform scaling
  • Application server tier expansion
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
AE154ACompatible
HP XP20000/XP24000 Cache Memory 16Gb (2x8Gb)
compatible
HITX5529255-ACompatible
HP XP20000/XP24000 Cache Memory 8Gb DIMM
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
AE154ASUBSTITUTE
HP XP20000/XP24000 Cache Memory 8Gb DIMM
HPE
HITX5529255-ASUBSTITUTE
HP XP20000/XP24000 Cache Memory 8Gb DIMM
HPE
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FREQUENTLY ASKED QUESTIONS
What is 5529255-A?
5529255-A is a Hitachi 16GB (4x4gb) Cache Memory manufactured by HITACHI. It is classified as a MEMORY (RDIMM).
What parts can replace 5529255-A?
There are 2 known substitutes for 5529255-A: AE154A, HITX5529255-A. Substitute compatibility should be verified for your specific system.
Is 5529255-A still available?
5529255-A is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026