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1981431 ✓ 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

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include body_width: 1.312 INCHES MAXIMUM IN, body_height: 0.875 INCHES MAXIMUM IN, body_length: 1.406 INCHES MAXIMUM IN, inclosure_type: FULLY INCLOSED, mounting_method: THREADED HOLE(S) SINGLE GROUP, frequency_rating: 400.0 HERTZ NOMINAL SINGLE COMPONENT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-657-2402, 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
1981431
NSN: 5950-00-657-2402
FSC: 5950
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
body_width1.312 INCHES MAXIMUM IN
body_height0.875 INCHES MAXIMUM IN
body_length1.406 INCHES MAXIMUM IN
inclosure_typeFULLY INCLOSED
mounting_methodTHREADED HOLE(S) SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
nominal_thread_size0.112 INCHES SINGLE GROUP IN
reliability_indicatorNOT ESTABLISHED
impedance_rating_in_ohms898.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
winding_operating_current600.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
mounting_facility_quantity2 SINGLE GROUP
NSN5950-00-657-2402
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TRANSFORMER,AUDIO FREQUENCY TITLE COMPONENT PN 1981431 MFR TRANSFORMER,AUDIO FREQ
KEY FEATURES
•
RELIABILITY INDICATOR: NOT ESTABLISHED
•
WINDING FUNCTION AND QUANTITY: 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
•
WINDING OPERATING CURRENT: 600.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
•
BODY HEIGHT: 0.875 INCHES MAXIMUM IN
•
BODY WIDTH: 1.312 INCHES MAXIMUM IN
•
IMPEDANCE RATING IN OHMS: 3600.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
•
PRIMARY TO SECONDARY TURN RATIO: 1 TO 1 SINGLE COMPONENT
TECHNICAL CHARACTERISTICS (FLIS)
RELIABILITY INDICATORNOT ESTABLISHED
WINDING FUNCTION AND QUANTITY1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
WINDING OPERATING CURRENT600.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
BODY HEIGHT0.875 INCHES MAXIMUM IN
BODY WIDTH1.312 INCHES MAXIMUM IN
IMPEDANCE RATING IN OHMS3600.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
PRIMARY TO SECONDARY TURN RATIO1 TO 1 SINGLE COMPONENT
IMPEDANCE RATING IN OHMS898.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
TERMINAL TYPE AND QUANTITY4 TAB, SOLDER LUG
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
4.50-6Interchangeable
interchangeable cross-reference
interchangeable
5.30/4.50-6Interchangeable
interchangeable cross-reference
interchangeable
GP5/5.30/4.50-6/TR87/OFF CENTERInterchangeable
interchangeable cross-reference
interchangeable
BS4-1575P19Interchangeable
interchangeable cross-reference
interchangeable
34-135-1Interchangeable
interchangeable cross-reference
interchangeable
5306Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1981431?
1981431 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace 1981431?
There are 21 known substitutes for 1981431: 4.50-6, 5.30/4.50-6, GP5/5.30/4.50-6/TR87/OFF CENTER and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1981431?
1981431 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-657-2402. 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