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556A ✓ Verified by PartsTable
— · COMPONENT
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. Key specifications include color: AMBER LENS, phase: SINGLE INPUT, material: ALUMINUM OVERALL, body_width: 0.220 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN, body_height: 0.140 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN, body_length: 0.660 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6220-00-055-1184, 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
556A
NSN: 6220-00-055-1184
FSC: 6220
CAGE: 72635 — DIETZ R E CO (USA)
SPECIFICATIONS
colorAMBER LENS
phaseSINGLE INPUT
materialALUMINUM OVERALL
body_width0.220 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
body_height0.140 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
body_length0.660 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
power_rating0.333 HORSEPOWER OUTPUT
overall_width4.000 INCHES NOMINAL IN
cooling_methodNONVENTILATED
overall_height2.062 INCHES NOMINAL IN
overall_length6.062 INCHES NOMINAL IN
mounting_methodPRESS FIT
NSN6220-00-055-1184
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,PAPER DIELECTRIC TITLE COMPONENT PN 556A MFR CAPACITOR,FIXED,PAPER
KEY FEATURES
•
SURFACE CONDITION: GROOVED BACK
•
MOUNTING METHOD: PRESS FIT
•
MATERIAL: PLASTIC ACRYLIC LENS
•
MOUNTING DEVICE QUANTITY: 1
•
STYLE DESIGNATOR: FLAT
•
COLOR: AMBER LENS
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)
SURFACE CONDITIONGROOVED BACK
MOUNTING METHODPRESS FIT
MATERIALPLASTIC ACRYLIC LENS
MOUNTING DEVICE QUANTITY1
STYLE DESIGNATORFLAT
OVERALL LENGTH4.000 INCHES NOMINAL IN
SURFACE CONDITIONSMOOTH FACE
COLORAMBER LENS
LIGHT TRANSMISSION DESIGNTRANSLUCENT LENS
OVERALL WIDTH2.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
3789MILG3278AInterchangeable
interchangeable cross-reference
interchangeable
789ANG25Interchangeable
interchangeable cross-reference
interchangeable
3789Interchangeable
interchangeable cross-reference
interchangeable
8875-00Interchangeable
interchangeable cross-reference
interchangeable
GG-K-391Interchangeable
interchangeable cross-reference
interchangeable
90-123Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 556A?
556A is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace 556A?
There are 21 known substitutes for 556A: 3789MILG3278A, 789ANG25, 3789 and 18 more. Substitute compatibility should be verified for your specific system.
Is 556A still available?
556A 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: July 2026