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Technical Data Sheet
PartsTable / COMPONENT / FT643-B
FT643-B ✓ 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 DUMMY LOAD,ELECTRICAL is a the manufacturer industrial component. Key specifications include power_rating: 1.000 WATTS AVERAGE AND 100.000 WATTS PEAK, body_diameter: 0.270 INCHES NOMINAL IN, cooling_method: SELF-COOLED, overall_length: 0.430 INCHES NOMINAL IN, overall_diameter: 0.312 INCHES NOMINAL IN, style_designator: COAXIAL MOUNTED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5985-01-233-4304, 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
FT643-B
NSN: 5985-01-233-4304
FSC: 5985
CAGE: 07180 — SPECTRUM MICROWAVE, INC. (USA)
SPECIFICATIONS
power_rating1.000 WATTS AVERAGE AND 100.000 WATTS PEAK
body_diameter0.270 INCHES NOMINAL IN
cooling_methodSELF-COOLED
overall_length0.430 INCHES NOMINAL IN
overall_diameter0.312 INCHES NOMINAL IN
style_designatorCOAXIAL MOUNTED
termination_typeCONNECTOR RECEPTACLE
precious_materialGOLD
operating_positionALL POSITIONS
frequency_range_rating+0.000 TO 18.000 GIGAHERTZ
impedance_rating_in_ohms50.0 NOMINAL
specification/standard_data81349-MIL-D-39030/3 GOVERNMENT SPECIFICATION
NSN5985-01-233-4304
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available DUMMY LOAD,ELECTRICAL TITLE COMPONENT PN FT643-B MFR DUMMY LOAD,ELECTRICAL
KEY FEATURES
•
OPERATING POSITION: ALL POSITIONS
•
OVERALL DIAMETER: 0.312 INCHES NOMINAL IN
•
FREQUENCY RANGE RATING: +0.000 TO 18.000 GIGAHERTZ
•
COOLING METHOD: SELF-COOLED
•
STYLE DESIGNATOR: COAXIAL MOUNTED
•
VOLTAGE STANDING WAVE RATIO FREQUENCY RANGE: +0.000 TO 18.000 GIGAHERTZ
•
BODY DIAMETER: 0.270 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING POSITIONALL POSITIONS
OVERALL DIAMETER0.312 INCHES NOMINAL IN
FREQUENCY RANGE RATING+0.000 TO 18.000 GIGAHERTZ
COOLING METHODSELF-COOLED
STYLE DESIGNATORCOAXIAL MOUNTED
OVERALL LENGTH0.430 INCHES NOMINAL IN
VOLTAGE STANDING WAVE RATIO FREQUENCY RANGE+0.000 TO 18.000 GIGAHERTZ
BODY DIAMETER0.270 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81349-MIL-D-39030/3 GOVERNMENT SPECIFICATION
POWER RATING1.000 WATTS AVERAGE AND 100.000 WATTS PEAK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
587-529-020Interchangeable
interchangeable cross-reference
interchangeable
3900-1Interchangeable
interchangeable cross-reference
interchangeable
247AS-C0488-002Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-39030/3Interchangeable
interchangeable cross-reference
interchangeable
M39030/3-03NInterchangeable
interchangeable cross-reference
interchangeable
M39030/3-03Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FT643-B?
FT643-B is a DUMMY LOAD,ELECTRICAL.
What parts can replace FT643-B?
There are 22 known substitutes for FT643-B: 587-529-020, 3900-1, 247AS-C0488-002 and 19 more. Substitute compatibility should be verified for your specific system.
Is FT643-B still available?
FT643-B 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