PartsTable
Technical Data Sheet
PartsTable / MRO / 37121
37121 ✓ Verified by PartsTable
Trefl · 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 color: WHITE OVERALL, width: 1.000 INCHES NOMINAL IN, length: 2.750 INCHES NOMINAL IN, material: PAPER, body_width: 0.750 INCHES NOMINAL IN, body_height: 1.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-070-7993, 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→ 37121
NSN: 5950-00-070-7993
FSC: 5950
CAGE: 73386 — FREED TRANSFORMER CO (USA)
SPECIFICATIONS
colorWHITE OVERALL
width1.000 INCHES NOMINAL IN
length2.750 INCHES NOMINAL IN
materialPAPER
body_width0.750 INCHES NOMINAL IN
body_height1.000 INCHES NOMINAL IN
body_length3.850 INCHES NOMINAL IN
rating_methodELECTRICAL SINGLE COMPONENT SINGLE WINDING
inclosure_typeENCASED
overall_height1.380 INCHES NOMINAL IN
inductance_typeFIXED
mounting_methodUNTHREADED HOLE(S) SINGLE GROUP
NSN5950-00-070-7993
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Trefl CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN 37121 MFR Trefl CAPACITOR,VARIABLE,AIR
KEY FEATURES
•
MOUNTING FACILITY QUANTITY: 1 SINGLE GROUP
•
INDUCTANCE TYPE: FIXED
•
INCLOSURE TYPE: FULLY INCLOSED
•
INDUCTANCE RATING: 20.00 MILLIHENRIES NOMINAL SINGLE COMPONENT SINGLE WINDING
•
WINDING OPERATING CURRENT: 20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE WINDING
•
DC RESISTANCE RATING IN OHMS: 80.000 SINGLE COMPONENT SINGLE WINDING
•
MOUNTING METHOD: UNTHREADED HOLE(S) SINGLE GROUP
•
BODY LENGTH: 0.500 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)
MOUNTING FACILITY QUANTITY1 SINGLE GROUP
INDUCTANCE TYPEFIXED
INCLOSURE TYPEFULLY INCLOSED
INDUCTANCE RATING20.00 MILLIHENRIES NOMINAL SINGLE COMPONENT SINGLE WINDING
WINDING OPERATING CURRENT20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE WINDING
DC RESISTANCE RATING IN OHMS80.000 SINGLE COMPONENT SINGLE WINDING
MOUNTING METHODUNTHREADED HOLE(S) SINGLE GROUP
BODY LENGTH0.500 INCHES NOMINAL IN
OVERALL DIAMETER1.188 INCHES NOMINAL IN
WINDING QUANTITY1 SINGLE COMPONENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
371-21Interchangeable
interchangeable cross-reference
interchangeable
08-0604Interchangeable
interchangeable cross-reference
interchangeable
D11708-25-2Interchangeable
interchangeable cross-reference
interchangeable
15852Interchangeable
interchangeable cross-reference
interchangeable
583R669H02Interchangeable
interchangeable cross-reference
interchangeable
45004Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 37121?
37121 is a CAPACITOR,VARIABLE,AIR DIELECTRI manufactured by Trefl. It is classified as a MRO (MRO_GENERAL).
What parts can replace 37121?
There are 9 known substitutes for 37121: 371-21, 08-0604, D11708-25-2 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 37121?
37121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-070-7993. 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