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Technical Data Sheet
PartsTable / MRO / 2181743-1
2181743-1 ✓ 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

The CAPACITOR,FIXED,ELECTROLYTIC is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include shaft_type: ROUND, HOLLOWED FIRST ACTUATOR, flat_height: 0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM SECOND ACTUATOR IN, shaft_length: 0.800 INCHES NOMINAL SECOND ACTUATOR IN, thread_class: 2A SINGLE MOUNTING FACILITY A, pole_quantity: 1 SINGLE SECTION FRONT, terminal_type: TAB W/SCREW. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-955-9847, 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→ 2181743-1
NSN: 5930-00-955-9847
FSC: 5930
CAGE: 02769 — LOCKHEED MARTIN CORPORATION DIV RMS (USA)
SPECIFICATIONS
shaft_typeROUND, HOLLOWED FIRST ACTUATOR
flat_height0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM SECOND ACTUATOR IN
shaft_length0.800 INCHES NOMINAL SECOND ACTUATOR IN
thread_class2A SINGLE MOUNTING FACILITY A
pole_quantity1 SINGLE SECTION FRONT
terminal_typeTAB W/SCREW
overall_length4.050 INCHES NOMINAL IN
shaft_diameter0.468 INCHES NOMINAL FIRST ACTUATOR IN
throw_quantity4 SINGLE SECTION FRONT
mounting_methodBRACKET(S) AND THREADED HOLE(S) SINGLE MOUNTING FACILITY
overall_diameter2.370 INCHES NOMINAL IN
style_designatorCIRCULAR WAFER, PANEL MOUNT
NSN5930-00-955-9847
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,ELECTROLYTIC TITLE COMPONENT PN 2181743-1 MFR CAPACITOR,FIXED,ELECTR
KEY FEATURES
•
CONTACT VOLTAGE RATING IN VOLTS: 28.0 DC AT SEA LEVEL
•
FIRST FLAT LENGTH: 0.740 INCHES NOMINAL SECOND ACTUATOR IN
•
FLAT HEIGHT: 0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM SECOND ACTUATOR IN
•
MOUNTING FACILITY PATTERN: FOUR POSITION RECTANGULAR SINGLE MOUNTING FACILITY
•
SHAFT LENGTH: 0.800 INCHES NOMINAL SECOND ACTUATOR IN
•
SHAFT DIAMETER: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM SECOND ACTUATOR IN
•
OVERALL DIAMETER: 2.370 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)
CONTACT VOLTAGE RATING IN VOLTS28.0 DC AT SEA LEVEL
FIRST FLAT LENGTH0.740 INCHES NOMINAL SECOND ACTUATOR IN
FLAT HEIGHT0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM SECOND ACTUATOR IN
MOUNTING FACILITY PATTERNFOUR POSITION RECTANGULAR SINGLE MOUNTING FACILITY
SHAFT LENGTH0.800 INCHES NOMINAL SECOND ACTUATOR IN
SHAFT DIAMETER0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM SECOND ACTUATOR IN
OVERALL DIAMETER2.370 INCHES NOMINAL IN
OVERALL LENGTH4.050 INCHES NOMINAL IN
CONTACT VOLTAGE RATING IN VOLTS115.0 AC AT SEA LEVEL
NOMINAL THREAD SIZE0.190 INCHES SINGLE MOUNTING FACILITY IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
900039-001Interchangeable
interchangeable cross-reference
interchangeable
PTT82Interchangeable
interchangeable cross-reference
interchangeable
NLW25-25Interchangeable
interchangeable cross-reference
interchangeable
042142Interchangeable
interchangeable cross-reference
interchangeable
0042142-0Interchangeable
interchangeable cross-reference
interchangeable
0042142Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2181743-1?
2181743-1 is a CAPACITOR,FIXED,ELECTROLYTIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 2181743-1?
There are 16 known substitutes for 2181743-1: 900039-001, PTT82, NLW25-25 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2181743-1?
2181743-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-955-9847. 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