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Technical Data Sheet
PartsTable / MEMORY / 643
643 ✓ Verified by PartsTable
Melissa & Doug · 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

8 x 32GB RDIMM, 2400MT/s, Dual Rank, x4 Data Width. Key specifications include material: ALUMINUM, special_features: LENGTH: 12.500; WIDTH: 13.00. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-049-8875, 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→ 643
NSN: 6625-00-049-8875
FSC: 6625
CAGE: 65092 — SOLARTRON ELECTRONICS INC WESTON INSTRUMENTS DIV (USA)
SPECIFICATIONS
materialALUMINUM
special_featuresLENGTH: 12.500; WIDTH: 13.00
NSN6625-00-049-8875
COMPONENT DIAGRAM
ECC 32GB 2Rx4 PC4 — RDIMM Melis NOTCH ~133.35 mm DDR4 RDIMM | 32GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 643 MFR Melissa & Doug 32GB —
KEY FEATURES
•
32GB Capacity
•
FEATURES PROVIDED: ZERO ADJUSTER
•
MOVEMENT TYPE: MOVING COIL, PERMANENT MAGNET
•
POINTER COLOR: WHITE SINGLE INDICATOR SINGLE RANGE
•
INDICATOR TYPE: DIAL W/POINTER
•
CIRCUIT ATTACHMENT METHOD AND QUANTITY: 2 THREADED STUD
•
SCALE GRADUATION TYPE: LINEAR SINGLE INDICATOR SINGLE RANGE
•
MOVEMENT SUSPENSION METHOD: JEWEL PIVOT BASE
•
COLOR: UNABLE TO DECODE
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
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDZERO ADJUSTER
MOVEMENT TYPEMOVING COIL, PERMANENT MAGNET
POINTER COLORWHITE SINGLE INDICATOR SINGLE RANGE
INDICATOR TYPEDIAL W/POINTER
CIRCUIT ATTACHMENT METHOD AND QUANTITY2 THREADED STUD
SCALE GRADUATION TYPELINEAR SINGLE INDICATOR SINGLE RANGE
MOVEMENT SUSPENSION METHODJEWEL PIVOT BASE
COLORUNABLE TO DECODE
NUCLEAR HARDNESS CRITICAL FEATURENONHARDENED
ACCURACY IN PERCENT-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR ALL RANGES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
643Interchangeable
interchangeable cross-reference
interchangeable
DXInterchangeable
interchangeable cross-reference
interchangeable
188685Interchangeable
interchangeable cross-reference
interchangeable
METI48Interchangeable
interchangeable cross-reference
interchangeable
205007Interchangeable
interchangeable cross-reference
interchangeable
254049Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 643?
643 is a 8 x 32GB RDIMM, 2400MT/s, Dual Rank, x4 Data Width manufactured by Melissa & Doug. It is classified as a MEMORY (RDIMM).
What parts can replace 643?
There are 8 known substitutes for 643: 643, DX, 188685 and 5 more. Substitute compatibility should be verified for your specific system.
Is 643 still available?
643 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026