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C4391 ✓ 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,MICA DIELECTRIC. Key specifications include material: PAPER OVERALL, body_width: 0.220 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN, body_height: 0.680 INCHES NOMINAL IN, body_length: 0.660 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN, thread_class: 2A ALL THREADED STUD A, body_diameter: 1.250 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-078-5305, 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
C4391
NSN: 5930-00-078-5305
FSC: 5930
CAGE: 81412 — TREADWELL CORPORATION (DELAWARE) DBA TREADWELL CORP (USA)
SPECIFICATIONS
materialPAPER OVERALL
body_width0.220 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
body_height0.680 INCHES NOMINAL IN
body_length0.660 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
thread_class2A ALL THREADED STUD A
body_diameter1.250 INCHES NOMINAL IN
terminal_typeTAB, SOLDER LUG
thread_length0.257 INCHES MAXIMUM ALL THREADED STUD IN
overall_height1.120 INCHES MAXIMUM IN
overall_length1.870 INCHES NOMINAL IN
mounting_methodBASE AND UNTHREADED HOLE(S)
outside_diameter2.109 INCHES NOMINAL IN
NSN5930-00-078-5305
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,MICA DIELECTRIC TITLE COMPONENT PN C4391 MFR CAPACITOR,FIXED,MICA D
KEY FEATURES
•
CONTACT STIMULUS RATING: 100.00 ACTUATION POINT NOMINAL DEGREES FAHRENHEIT AND 80.00 DEACTUATION POINT NOMINAL DEGREES FAHRENHEIT
•
CONTACT ADJUSTABILITY: DEACTUATION POINT NOT ADJUSTABLE AND ACTUATION POINT NOT ADJUSTABLE
•
FEATURES PROVIDED: HERMETICALLY SEALED CASE
•
BODY DIAMETER: 1.125 INCHES NOMINAL IN
•
BODY HEIGHT: 0.688 INCHES NOMINAL IN
•
CONTACT VOLTAGE RATING IN VOLTS: 30.0 DC AT SEA LEVEL THIRD VOLTAGE
•
CONTACT ACTION STIMULUS: INCREASE
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 STIMULUS RATING100.00 ACTUATION POINT NOMINAL DEGREES FAHRENHEIT AND 80.00 DEACTUATION POINT NOMINAL DEGREES FAHRENHEIT
CONTACT ADJUSTABILITYDEACTUATION POINT NOT ADJUSTABLE AND ACTUATION POINT NOT ADJUSTABLE
FEATURES PROVIDEDHERMETICALLY SEALED CASE
BODY DIAMETER1.125 INCHES NOMINAL IN
BODY HEIGHT0.688 INCHES NOMINAL IN
CONTACT VOLTAGE RATING IN VOLTS30.0 DC AT SEA LEVEL THIRD VOLTAGE
OVERALL LENGTH2.187 INCHES NOMINAL IN
CONTACT ACTION STIMULUSINCREASE
DISTANCE BETWEEN MOUNTING FACILITY CENTERS1.812 INCHES NOMINAL IN
NONPILE-UP CONTACT ARRANGEMENT1 POLE, DOUBLE THROW, ONE POSITION MOMENTARY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
450023Interchangeable
interchangeable cross-reference
interchangeable
373405-1Interchangeable
interchangeable cross-reference
interchangeable
SN7410JAInterchangeable
interchangeable cross-reference
interchangeable
C7067Interchangeable
interchangeable cross-reference
interchangeable
73218FInterchangeable
interchangeable cross-reference
interchangeable
SB6486Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C4391?
C4391 is a CAPACITOR,FIXED,MICA DIELECTRIC.
What parts can replace C4391?
There are 12 known substitutes for C4391: 450023, 373405-1, SN7410JA and 9 more. Substitute compatibility should be verified for your specific system.
Is C4391 still available?
C4391 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026