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Technical Data Sheet
PartsTable / MRO / U503AD
U503AD ✓ 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

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include overall_width: 2.375 INCHES NOMINAL IN, inclosure_type: HERMETICALLY SEALED, overall_height: 2.250 INCHES NOMINAL IN, overall_length: 4.375 INCHES NOMINAL IN, nominal_thread_size: 0.138 INCHES IN, reference_frequency_per_function: 509.0 KILOHERTZ BLANK LOCATION NOT OTHERWISE SPECIFIED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5915-00-912-6621, 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→ U503AD
NSN: 5915-00-912-6621
FSC: 5915
CAGE: 00816 — PALOMAR PRODUCTS, INC. (USA)
SPECIFICATIONS
overall_width2.375 INCHES NOMINAL IN
inclosure_typeHERMETICALLY SEALED
overall_height2.250 INCHES NOMINAL IN
overall_length4.375 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES IN
reference_frequency_per_function509.0 KILOHERTZ BLANK LOCATION NOT OTHERWISE SPECIFIED
frequency_band_width_per_function501.70 KILOHERTZ BLANK AND 514.00 KILOHERTZ BLANK LOCATION NOT OTHERWISE SPECIFIED
input_impedance_per_function_w/load3.9 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
mounting_facility_type_and_quantity1 THREADED HOLE(S) LOCATION NOT OTHERWISE SPECIFIED
functional_terminal_type_and_quantity2 SOLDER STUD OUTPUT SECOND FUNCTION
mounting_facility_screw_thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
output_impedance_per_function_w/source_across_input10.0 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
NSN5915-00-912-6621
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RESISTOR,FIXED,WIRE WOUND,INDUCT TITLE COMPONENT PN U503AD MFR RESISTOR,FIXED,WIRE WO
KEY FEATURES
•
INCLOSURE TYPE: HERMETICALLY SEALED
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
•
MOUNTING FACILITY TYPE AND QUANTITY: 1 THREADED HOLE(S) LOCATION NOT OTHERWISE SPECIFIED
•
FREQUENCY BAND WIDTH PER FUNCTION: 501.70 KILOHERTZ BLANK AND 514.00 KILOHERTZ BLANK LOCATION NOT OTHERWISE SPECIFIED
•
OUTPUT IMPEDANCE PER FUNCTION W/SOURCE ACROSS INPUT: 10.0 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
•
FUNCTIONAL TERMINAL TYPE AND QUANTITY: 2 SOLDER STUD OUTPUT SECOND FUNCTION
•
INPUT IMPEDANCE PER FUNCTION W/LOAD: 3.9 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
INCLOSURE TYPEHERMETICALLY SEALED
NOMINAL THREAD SIZE0.138 INCHES IN
MOUNTING FACILITY TYPE AND QUANTITY1 THREADED HOLE(S) LOCATION NOT OTHERWISE SPECIFIED
FREQUENCY BAND WIDTH PER FUNCTION501.70 KILOHERTZ BLANK AND 514.00 KILOHERTZ BLANK LOCATION NOT OTHERWISE SPECIFIED
OUTPUT IMPEDANCE PER FUNCTION W/SOURCE ACROSS INPUT10.0 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
FUNCTIONAL TERMINAL TYPE AND QUANTITY2 SOLDER STUD OUTPUT SECOND FUNCTION
INPUT IMPEDANCE PER FUNCTION W/LOAD3.9 KILOHMS BLANK LOCATION NOT OTHERWISE SPECIFIED
FUNCTIONAL TERMINAL TYPE AND QUANTITY2 SOLDER STUD INPUT FIRST FUNCTION
FUNCTIONAL TERMINAL TYPE AND QUANTITY1 SOLDER STUD GROUND THIRD FUNCTION
OVERALL WIDTH2.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
34300Interchangeable
interchangeable cross-reference
interchangeable
P11157Interchangeable
interchangeable cross-reference
interchangeable
41928Interchangeable
interchangeable cross-reference
interchangeable
34303Interchangeable
interchangeable cross-reference
interchangeable
0A10005AInterchangeable
interchangeable cross-reference
interchangeable
SA31 1601JInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is U503AD?
U503AD is a RESISTOR,FIXED,WIRE WOUND,INDUCT. It is classified as a MRO (MRO_GENERAL).
What parts can replace U503AD?
There are 18 known substitutes for U503AD: 34300, P11157, 41928 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for U503AD?
U503AD is cataloged in the Federal Logistics Information System (FLIS) under NSN 5915-00-912-6621. 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