IS49 Transistor Optocoupler

Press Release

IS49 Transistor Optocoupler

ISOCOM’s IS49 optocoupler is a popular hermetic ceramic device which  has been used in several space applications, such as the Yenisey A1  geostationary satellite. Package styles include a 6-Pin LCC Package with  solder dip options available, as well as a surface mount alternative, the  4N49.

The IS49 is a hermetically sealed, single-channel transistor optocoupler, composed  of an infrared emitting diode and a silicon phototransistor. This particular  optocoupler has a continuous maximum forward current of 50mA, CTR over 350%  and a withstand test voltage of 1,000VDC.

ISOCOM Limited is an AS9100D and ISO9001:2015 accredited UK manufacturer  for space and aerospace grade electronic components. All ISOCOM products are  produced in our clean room, manufacturing facility in compliance with MIL-PRF38534 and MIL-PRF-19500 to ensure high-quality and radiation resistant  electronics.

Some ISOCOM components, including the IS49 Family, CSM141A Family  and CSM1800 Family, were selected and tested by the Jet Propulsion  Laboratory (JPL) and The Fraunhofer Institute. This included irradiation  testing, neutral irradiation testing and displacement damage  measurements.

The IS49 was TID tested to meet the total dose levels of  150Krad(Si) and displacement damage tested to 1 MeV x 1013.  This optoisolator operates within the full military temperature range  of -55oC to +125oC to ensure that this component is suitable for  the radiation harsh environments encountered in space  applications.

This part is suitable for other various applications such as – space  equipment and systems; aerospace applications; military equipment  and systems; medical instruments; MOS/CMOS applications; logic  interfacing; data transmission; power supply and modems.

For further information please visit the Isocom website or email our team at


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