PartsTable
Technical Data Sheet
PartsTable / MRO / ATM20
ATM20 ✓ 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

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include shaft_type: ROUND, SLOTTED SINGLE SHAFT, shaft_length: 0.250 INCHES NOMINAL SINGLE SHAFT IN, inclosure_type: UNINCLOSED, overall_length: 1.125 INCHES NOMINAL IN, shaft_diameter: 0.188 INCHES NOMINAL SINGLE SHAFT IN, tuning_characteristic: STRAIGHT LINE CAPACITY SINGLE SECTION. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5920-00-170-4236, 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→ ATM20
NSN: 5920-00-170-4236
FSC: 5920
CAGE: 71424 — MERSEN USA EP CORP. DBA FERRAZ SHAWMUT (USA)
SPECIFICATIONS
shaft_typeROUND, SLOTTED SINGLE SHAFT
shaft_length0.250 INCHES NOMINAL SINGLE SHAFT IN
inclosure_typeUNINCLOSED
overall_length1.125 INCHES NOMINAL IN
shaft_diameter0.188 INCHES NOMINAL SINGLE SHAFT IN
tuning_characteristicSTRAIGHT LINE CAPACITY SINGLE SECTION
adjustment_device_rotation180.0 DEGREES NOMINAL CLOCKWISE
terminal_type_and_quantity2 TAB, SOLDER LUG
capacitance_range_in_picofarads+2.7 TO 19.8 SINGLE SECTION
nonderated_voltage_rating_and_type750.0 AC PEAK SINGLE SECTION
adjustment_device_drive_type_and_quantity1 SHAFT
NSN5920-00-170-4236
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN ATM20 MFR CAPACITOR,VARIABLE,AIR
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
643684Interchangeable
interchangeable cross-reference
interchangeable
ATM20Interchangeable
interchangeable cross-reference
interchangeable
FFP20-000Interchangeable
interchangeable cross-reference
interchangeable
875FU0123Interchangeable
interchangeable cross-reference
interchangeable
F60C500V20AInterchangeable
interchangeable cross-reference
interchangeable
MCL20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ATM20?
ATM20 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace ATM20?
There are 18 known substitutes for ATM20: 643684, ATM20, FFP20-000 and 15 more. Substitute compatibility should be verified for your specific system.
Is ATM20 still available?
ATM20 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