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Technical Data Sheet
PartsTable / MRO / 439A
439A ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

CAPACITOR,FIXED,PAPER DIELECTRIC. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5985-00-105-2943, 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
MRO→ MRO_GENERAL→ 439A
NSN: 5985-00-105-2943
FSC: 5985
CAGE: 80138 — KAY ELEMETRICS CORPORATION (USA)
SPECIFICATIONS
Part Number439A
NSN5985-00-105-2943
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,PAPER DIELECTRIC TITLE COMPONENT PN 439A MFR CAPACITOR,FIXED,PAPER
KEY FEATURES
•
BODY STYLE: COAXIAL TYPE
•
INSERTION LOSS AT MINIMUM ATTENUATION IN MAXIMUM DECIBELS: 0.1
•
IMPEDANCE RATING IN OHMS: 50.0 INPUT-OUTPUT
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH6.000 INCHES NOMINAL IN
OVERALL WIDTH1.312 INCHES NOMINAL IN
END ITEM IDENTIFICATIONINSTRUMENT LANDING SYSTEM,ILS,CONTRACT FATQUA-3880
BODY STYLECOAXIAL TYPE
OVERALL HEIGHT1.406 INCHES NOMINAL IN
INSERTION LOSS AT MINIMUM ATTENUATION IN MAXIMUM DECIBELS0.1
IMPEDANCE RATING IN OHMS50.0 INPUT-OUTPUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
439ACAPACIT0RInterchangeable
interchangeable cross-reference
interchangeable
439AInterchangeable
interchangeable cross-reference
interchangeable
4251-00Interchangeable
interchangeable cross-reference
interchangeable
TLC4251Interchangeable
interchangeable cross-reference
interchangeable
545-011Interchangeable
interchangeable cross-reference
interchangeable
17-004Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 439A?
439A is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 439A?
There are 7 known substitutes for 439A: 439ACAPACIT0R, 439A, 4251-00 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 439A?
439A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5985-00-105-2943. 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