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Technical Data Sheet
PartsTable / MRO / 4990
4990 ✓ Verified by PartsTable
Zyxel · 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,VARIABLE,AIR DIELECTRI. Key specifications include material: COPPER ALLOY CAPACITIVE ELECTRODE, duty_type: CONTINUOUS, body_style: CYLINDRICAL FRAME, case_style: SQUARE, seal_width: 0.250 INCHES NOMINAL IN, shaft_type: ROUND, SLOTTED SINGLE SHAFT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-189-3631, 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→ 4990
NSN: 5950-00-189-3631
FSC: 5950
CAGE: 80089 — EMERSON ELECTRIC CO WHITE-RODGERS DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY CAPACITIVE ELECTRODE
duty_typeCONTINUOUS
body_styleCYLINDRICAL FRAME
case_styleSQUARE
seal_width0.250 INCHES NOMINAL IN
shaft_typeROUND, SLOTTED SINGLE SHAFT
body_length2.406 INCHES NOMINAL IN
shaft_length0.250 INCHES NOMINAL SINGLE SHAFT IN
body_diameter1.125 INCHES NOMINAL IN
overall_width2.188 INCHES NOMINAL IN
turn_quantity50 SINGLE COMPONENT SINGLE WINDING
coil_form_typeHOLLOW SINGLE COMPONENT
NSN5950-00-189-3631
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Zyxel CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN 4990 MFR Zyxel CAPACITOR,VARIABLE,AIR
KEY FEATURES
•
TERMINAL TYPE AND QUANTITY: 2 WIRE LEAD
•
INCLOSURE TYPE: OPEN
•
MOUNTING METHOD: TERMINAL SINGLE GROUP
•
TURN QUANTITY: 50 SINGLE COMPONENT SINGLE WINDING
•
COIL FORM TYPE: HOLLOW SINGLE COMPONENT
•
CORE CONSTRUCTION: POWDERED SINGLE COMPONENT
•
BODY LENGTH: 1.000 INCHES NOMINAL IN
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)
TERMINAL TYPE AND QUANTITY2 WIRE LEAD
INCLOSURE TYPEOPEN
MOUNTING METHODTERMINAL SINGLE GROUP
TURN QUANTITY50 SINGLE COMPONENT SINGLE WINDING
COIL FORM TYPEHOLLOW SINGLE COMPONENT
CORE CONSTRUCTIONPOWDERED SINGLE COMPONENT
SPECIAL FEATURESCOIL FORM PLASTIC MATERIAL; CONDUCTOR W/SINGLE SILK ENAMEL INSULATION; SINGLE LAYER WOUND TYPE
BODY LENGTH1.000 INCHES NOMINAL IN
WINDING CONDUCTOR SIZE0.00795 INCHES AMERICAN WIRE GAGE SINGLE COMPONENT SINGLE WINDING IN
BODY OUTSIDE DIAMETER0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
4990Interchangeable
interchangeable cross-reference
interchangeable
26437Interchangeable
interchangeable cross-reference
interchangeable
83977Interchangeable
interchangeable cross-reference
interchangeable
MS15612-4Interchangeable
interchangeable cross-reference
interchangeable
00044Interchangeable
interchangeable cross-reference
interchangeable
4990-000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4990?
4990 is a CAPACITOR,VARIABLE,AIR DIELECTRI manufactured by Zyxel. It is classified as a MRO (MRO_GENERAL).
What parts can replace 4990?
There are 8 known substitutes for 4990: 4990, 26437, 83977 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4990?
4990 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-189-3631. 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