4N47 / 4N48 / 4N49
Phototransistor Hermetic Optocouplers

The 4N47/48/49 is designed especially for hirel applications requiring optical isolation with high current transfer ratio and low saturation Vce. Each optocoupler consists of a light emmiting diode and a NPN silicon phototransistor mounted and coupled in a miniature custom ceramic substrate inside a hermeticTO-5 package. The low input current makes the 4N4X well suited for direct CMOS to LSTTL/TTL interfaces. All electrical parameters are identical to the JEDEC registered 4N47, 4N48, 4N49.

100% hi-rel screenings are available.


  • Current transfer ratio guaranteed over –55 °C to +100 °C ambient temp. range
  • 1000 V electrical isolation
  • Standard TO-5 hermetic package
  • High current transfer ratio at low input current
  • Base lead available for transistor biasing
  • 100% hi-rel screenings are offered
Data Sheets 4N47 / 4N48 / 4N49: Photo-Transistor Hermetic Optocouplers 4N4X_202237B.pdf (268 KB)
ProductName : 4N47 / 4N48 / 4N49
Memo :
Condition : TBD
CTR Min. : TBD
CTR Max. : TBD
Vcc Max. (V) : TBD
Switching Time (μs) : TBD
Isolation @ VDC 1 Sec. : TBD
Package Photo :
Package Info : 6-Lead Hermetic TO-5
Radiation Tolerant :
No Base Connection :
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