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Technical Data Sheet
PartsTable / COMPONENT / RELEASE4639
RELEASE4639 ✓ Verified by PartsTable
— · SFP TRANSCEIVER
WHAT YOU NEED TO KNOW
SR = Short Range (multimode, 300m) | LR = Long Range (single-mode, 10km) DOM = Digital Optical Monitoring — most enterprise SFPs support it
MATCH ALL THREE: Speed + Wavelength + Brand compatibility
PRODUCT OVERVIEW

The RESISTOR,FIXED,COMPOSITION is a the manufacturer industrial component. Key specifications include overall_width: 1.050 INCHES MAXIMUM IN, overall_height: 0.450 INCHES MAXIMUM IN, overall_length: 1.563 INCHES MAXIMUM IN, mounting_method: TERMINAL, terminal_length: 1.500 INCHES MINIMUM IN, overall_diameter: 0.370 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5961-00-079-6693, 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
RELEASE4639
NSN: 5961-00-079-6693
FSC: 5961
CAGE: 80131 — ELECTRONIC INDUSTRIES ASSOCIATION
SPECIFICATIONS
overall_width1.050 INCHES MAXIMUM IN
overall_height0.450 INCHES MAXIMUM IN
overall_length1.563 INCHES MAXIMUM IN
mounting_methodTERMINAL
terminal_length1.500 INCHES MINIMUM IN
overall_diameter0.370 INCHES MAXIMUM IN
special_featuresWEAPON SYSTEM ESSENTIAL; JUNCTION PATTERN ARRANGEMENT: NPN
features_providedHERMETICALLY SEALED CASE
nominal_thread_size0.312 INCHES IN
internal_configurationJUNCTION CONTACT
semiconductor_materialSILICON
end_item_identificationSUPPORT EQUIPMENT, B-1 AIRCRAFT; AIRCRAFT, (AC-130H, MC-130H, EC-130
NSN5961-00-079-6693
COMPONENT DIAGRAM
BAIL LATCH 10G SFP+ 850nm · SR (MMF, 300m) DOM: Digital Optical Monitoring TX RX LC DUPLEX 20-PIN EDGE CONNECTOR ~56.5 mm ~13.4mm SFP+ TRANSCEIVER | 10G | 850nm | SR (MMF, 300m) Hot-swappable | LC duplex fiber | DDM/DOM supported TITLE SFP+ XCVR PN RELEASE4639 MFR OEM RESISTOR,FIXED,COMPOSITION
KEY FEATURES
•
FEATURES PROVIDED: HERMETICALLY SEALED CASEHERMETICALLY SEALED CASE
•
TERMINAL TYPE AND QUANTITY: 3 TAB, SOLDER LUG3 TAB, SOLDER LUG
•
THREAD SERIES DESIGNATOR: UNFUNF
•
MOUNTING METHOD: THREADED STUD(S)
•
VOLTAGE RATING IN VOLTS PER CHARACTERISTIC: 120.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 120.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 7.0 MAXIMUM BREAKDOWN VOLTAGE, EMITTER-TO-BASE, COLLECTOR OPEN AND 7.0 MAXIMUM BREAKDOWN VOLTAGE, EMITTER-TO-BASE, COLLECTOR OPEN AND 60.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN60.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN
•
MAXIMUM OPERATING TEMP PER MEASUREMENT POINT: 200.0 CELSIUS JUNCTION200.0 CELSIUS JUNCTION DEGC
•
NOMINAL THREAD SIZE: 0.312 INCHES0.312 INCHES IN
•
OVERALL WIDTH ACROSS FLATS: 0.875 INCHES MAXIMUM0.875 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDHERMETICALLY SEALED CASEHERMETICALLY SEALED CASE
TERMINAL TYPE AND QUANTITY3 TAB, SOLDER LUG3 TAB, SOLDER LUG
THREAD SERIES DESIGNATORUNFUNF
MOUNTING METHODTHREADED STUD(S)
VOLTAGE RATING IN VOLTS PER CHARACTERISTIC120.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 120.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 7.0 MAXIMUM BREAKDOWN VOLTAGE, EMITTER-TO-BASE, COLLECTOR OPEN AND 7.0 MAXIMUM BREAKDOWN VOLTAGE, EMITTER-TO-BASE, COLLECTOR OPEN AND 60.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN60.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN
MAXIMUM OPERATING TEMP PER MEASUREMENT POINT200.0 CELSIUS JUNCTION200.0 CELSIUS JUNCTION DEGC
NOMINAL THREAD SIZE0.312 INCHES0.312 INCHES IN
OVERALL WIDTH ACROSS FLATS0.875 INCHES MAXIMUM0.875 INCHES MAXIMUM IN
OVERALL LENGTH0.535 INCHES MAXIMUM0.535 INCHES MAXIMUM IN
INTERNAL CONFIGURATIONJUNCTION CONTACTJUNCTION CONTACT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
2721-3630043Interchangeable
interchangeable cross-reference
interchangeable
3700223Interchangeable
interchangeable cross-reference
interchangeable
2N3054Interchangeable
interchangeable cross-reference
interchangeable
SDT8756Interchangeable
interchangeable cross-reference
interchangeable
2N3265Interchangeable
interchangeable cross-reference
interchangeable
04056686003909Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RELEASE4639?
RELEASE4639 is a RESISTOR,FIXED,COMPOSITION.
What parts can replace RELEASE4639?
There are 15 known substitutes for RELEASE4639: 2721-3630043, 3700223, 2N3054 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RELEASE4639?
RELEASE4639 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5961-00-079-6693. 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