PartsTable
Technical Data Sheet
PartsTable / MRO / 21-56
21-56 ✓ Verified by PartsTable
Trevi · 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

The portable radio with MP3 player Trevi DR 740 SD is an original speaker to listen to mp3 music from SD Secure Digital Flash Memory Card<br><br>Compact and lightweight, take it with you and where you want to connect your Micro Sd to amplify the sound and listen to all your favorite music in MP3 format.<br><br>The Trevi SD 740 SD also has an FM radio receiver SCAN with manual or automatic search for watching your favorite radio programs. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6685-00-010-7478, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
MRO→ MRO_GENERAL→ 21-56
NSN: 6685-00-010-7478
FSC: 6685
CAGE: 00334 — CLARIANT CORP DIV CLARIANT CORPORATION (USA)
SPECIFICATIONS
phaseSINGLE
shapeRECTANGULAR
height0.188 INCHES NOMINAL IN
agitatorINCLUDED
diameter0.375 INCHES NOMINAL IN
materialALUMINUM OVERALL
body_width0.400 INCHES NOMINAL IN
end_radius0.312 INCHES NOMINAL IN
head_styleBUTTON (RATIO OF HGTH/CRRG OVER 0.190 TO 0.300 INCLUSIVE)
body_height0.125 INCHES NOMINAL IN
body_length0.500 INCHES NOMINAL IN
current_typeAC
NSN6685-00-010-7478
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Trevi RESISTOR NETWORK,FIXED,WIRE WOUN TITLE COMPONENT PN 21-56 MFR Trevi RESISTOR NETWORK,FIXED
KEY FEATURES
•
WIDTH ACROSS FLATS: 1.375 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM ALLOY 2017 OR ALUMINUM ALLOY 2024
•
STYLE DESIGNATOR: PLUG
•
DESICCANT SPOT HUMIDITY PERCENTAGE: 40.0
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.625 INCHES NOMINAL IN
WIDTH ACROSS FLATS1.375 INCHES NOMINAL IN
MATERIALALUMINUM ALLOY 2017 OR ALUMINUM ALLOY 2024
STYLE DESIGNATORPLUG
DESICCANT SPOT HUMIDITY PERCENTAGE40.0
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
443-1430-001Interchangeable
interchangeable cross-reference
interchangeable
2156Interchangeable
interchangeable cross-reference
interchangeable
9225Interchangeable
interchangeable cross-reference
interchangeable
JS533-13AInterchangeable
interchangeable cross-reference
interchangeable
D4543Interchangeable
interchangeable cross-reference
interchangeable
HS3017-F10SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-56?
21-56 is a RESISTOR NETWORK,FIXED,WIRE WOUN manufactured by Trevi. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21-56?
There are 15 known substitutes for 21-56: 443-1430-001, 2156, 9225 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-56?
21-56 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6685-00-010-7478. 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