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J1403A — Memory Specs & Substitutes

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— · 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: Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW

IBM 4GB (2 x 2GB DDR2) Main Storage. Key specifications include phase: THREE, length: 19.0 MILLIMETERS NOMINAL MM, material: STEEL CORROSION RESISTING OVERALL, thickness: 1.0 MILLIMETERS NOMINAL MM, duty_cycle: CONTINUOUS, major_width: 5.0 MILLIMETERS NOMINAL MM. This part is cataloged in the Federal Logistics Information System under NSN 4720-00-230-6528, indicating validated use in U.S.

government and defense logistics supply chains. 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→ J1403A
NSN: 4720-00-230-6528
FSC: 4720
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
phaseTHREE
length19.0 MILLIMETERS NOMINAL MM
materialSTEEL CORROSION RESISTING OVERALL
thickness1.0 MILLIMETERS NOMINAL MM
duty_cycleCONTINUOUS
major_width5.0 MILLIMETERS NOMINAL MM
ambient_temp50.0 CELSIUS DEGC
control_typeLOCAL OR REMOTE
hole_spacingEVENLY SPACED
hole_quantity2
overall_width26.000 INCHES NOMINAL IN
overall_height13.000 INCHES NOMINAL IN
NSN4720-00-230-6528
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC4 — RDIMM OEM NOTCH ~133.35 mm DDR4 RDIMM | 4GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN J1403A MFR OEM 4GB —
KEY FEATURES
•
4GB Capacity
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
362AEInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4475InterchangeableGOVERNMENT REGISTRY
IBM 4GB (2 x 2GB DDR2) Main Storage
interchangeable
9129653InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
99S12InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
48241InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
12X12X12SWDOM275InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is J1403A?
J1403A is a IBM 4GB (2 x 2GB DDR2) Main Storage. It is classified as a MEMORY (RDIMM).
What parts can replace J1403A?
There are 22 known substitutes for J1403A: 362AE, 4475, 9129653 and 19 more. Substitute compatibility should be verified for your specific system.
Is J1403A still available?
J1403A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026