IS49 Schematic

IS49 Features

Hermetically sealed
LCC-6 package
Withstand test voltage up to 1,000VDC
Low input requirements
High current transfer ratio
Radiation tolerance tested to 150 Krad(si)
Displacement damage tested to 1 MEV x 1013
Small outline package for surface mount

Surface mount alternative for 4N49/4N49U


This device is a single channel, hermetically sealed optically coupled isolator.  It is comprised of an infrared emitting diode and a silicon phototransistor.

The IS49 is being used in environments encountered by space applications. Package styles for this device include an LCC-6 package, with solder dip option available.

Absolute maximum ratings, recommended operating conditions, electrical specifications and performance characteristics are identical for all units.  Any exceptions, due to packaging variations and limitations, are as noted in the datasheet.

Screening Level
IS49 Commercial grade
IS49/L2 Military Defence & Aerospace grade
IS49/L2S Space grade

Package Options
#20 Solder dip

How to buy Request quote Download Datasheet

Downloads for IS49

Document name Date uploaded Revision Download
NASA JPL Proton Displacement Damage Measurements May 05, 2018 1 Download
Fraunhofer Institute IS49 TID Irradiation Report May 05, 2018 1 Download
Fraunhofer Institute IS49 Neutron Irradiation Report May 05, 2018 1 Download


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Part: IS49

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