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Technical Data Sheet
2N491B ✓ 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 TRANSISTOR is a the manufacturer industrial component. Key specifications include overall_length: 0.260 INCHES MAXIMUM IN, mounting_method: TERMINAL, terminal_length: 1.500 INCHES MINIMUM IN, overall_diameter: 0.370 INCHES MAXIMUM IN, special_features: JUNCTION PATTERN ARRANGEMENT: PNP, features_provided: HERMETICALLY SEALED CASE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5961-00-239-9589, 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
2N491B
NSN: 5961-00-239-9589
FSC: 5961
CAGE: 03508 — GENERAL ELECTRIC CO SEMI-CONDUCTOR PRODUCTS DEPT (USA)
SPECIFICATIONS
overall_length0.260 INCHES MAXIMUM IN
mounting_methodTERMINAL
terminal_length1.500 INCHES MINIMUM IN
overall_diameter0.370 INCHES MAXIMUM IN
special_featuresJUNCTION PATTERN ARRANGEMENT: PNP
features_providedHERMETICALLY SEALED CASE
internal_configurationJUNCTION CONTACT
semiconductor_materialSILICON
terminal_circle_diameter0.200 INCHES NOMINAL IN
terminal_type_and_quantity3 UNINSULATED WIRE LEAD
specification/standard_data80131-RELEASE3648 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
power_rating_per_characteristic450.0 MILLIWATTS MAXIMUM TOTAL POWER DISSIPATION
NSN5961-00-239-9589
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 2N491B MFR OEM TRANSISTOR
KEY FEATURES
FEATURES PROVIDED: HERMETICALLY SEALED CASE
INTERNAL CONFIGURATION: UNIJUNCTION
TERMINAL TYPE AND QUANTITY: 3 UNINSULATED WIRE LEAD
SEMICONDUCTOR MATERIAL: SILICON
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDHERMETICALLY SEALED CASE
INTERNAL CONFIGURATIONUNIJUNCTION
TERMINAL TYPE AND QUANTITY3 UNINSULATED WIRE LEAD
SEMICONDUCTOR MATERIALSILICON
SPECIAL FEATURESJUNCTION PATTERN ARRANGEMENT: PN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
2N491BInterchangeable
interchangeable cross-reference
interchangeable
RELEASE4064Interchangeable
interchangeable cross-reference
interchangeable
4V15707Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2N491B?
2N491B is a TRANSISTOR.
What parts can replace 2N491B?
There are 3 known substitutes for 2N491B: 2N491B, RELEASE4064, 4V15707. Substitute compatibility should be verified for your specific system.
What is the NSN for 2N491B?
2N491B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5961-00-239-9589. This indicates validated use in U.S. government and defense supply chains.
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