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Technical Data Sheet
PartsTable / COMPONENT / 645-6105
645-6105 ✓ 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 RELAY ASSEMBLY is a the manufacturer industrial component. Key specifications include relay_type: ELECTROMAGNETIC, overall_width: 1.312 INCHES NOMINAL IN, overall_height: 1.359 INCHES NOMINAL IN, overall_length: 6.420 INCHES NOMINAL IN, mounting_facility: BRACKET(S), controlling_agency: NORTHROP CORPORATION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5945-00-731-1712, 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
645-6105
NSN: 5945-00-731-1712
FSC: 5945
CAGE: 62143 — NORTHERN TELECOM INC TELECOM DISTRIBUTION DIV (USA)
SPECIFICATIONS
relay_typeELECTROMAGNETIC
overall_width1.312 INCHES NOMINAL IN
overall_height1.359 INCHES NOMINAL IN
overall_length6.420 INCHES NOMINAL IN
mounting_facilityBRACKET(S)
controlling_agencyNORTHROP CORPORATION
identifying_number21089-1 DRAWING NO.
mounting_configurationTHREADED HOLE MOUNTED
individual_relay_quantity2
NSN5945-00-731-1712
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RELAY ASSEMBLY TITLE COMPONENT PN 645-6105 MFR RELAY ASSEMBLY
KEY FEATURES
•
INDIVIDUAL RELAY QUANTITY: 2
•
CONTROLLING AGENCY: NORTHROP CORPORATION
•
MOUNTING CONFIGURATION: THREADED HOLE MOUNTED
•
RELAY TYPE: ELECTROMAGNETIC
•
IDENTIFYING NUMBER: 21089-1 DRAWING NO.
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH6.420 INCHES NOMINAL IN
INDIVIDUAL RELAY QUANTITY2
CONTROLLING AGENCYNORTHROP CORPORATION
OVERALL HEIGHT1.359 INCHES NOMINAL IN
OVERALL WIDTH1.312 INCHES NOMINAL IN
MOUNTING CONFIGURATIONTHREADED HOLE MOUNTED
RELAY TYPEELECTROMAGNETIC
IDENTIFYING NUMBER21089-1 DRAWING NO.
MOUNTING FACILITYBRACKET(S)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
21089-1Interchangeable
interchangeable cross-reference
interchangeable
187802Interchangeable
interchangeable cross-reference
interchangeable
21089/1Interchangeable
interchangeable cross-reference
interchangeable
MODEL 56-645-0Interchangeable
interchangeable cross-reference
interchangeable
R31877PC6Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 645-6105?
645-6105 is a RELAY ASSEMBLY.
What parts can replace 645-6105?
There are 5 known substitutes for 645-6105: 21089-1, 187802, 21089/1 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 645-6105?
645-6105 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5945-00-731-1712. 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