IL55B Datasheet – Photodarlington Optocoupler – Siemens

Part Number: IL55B


Package: DIP 8 Pin

Manufacturer: Siemens AG


IL55B datasheet



The IL55B is an optically coupled isolator with a Gal-lium Arsenide infrared LED and a silicon photodarling-ton sensor. Switching can be achieved whilemaintaining a high degree of isolation between driving and load circuits. These optocouplers can be used to replace reed and mercury relays with advantages of long life, high speed switching and elimination of magnetic fields.


1. High Collector-Emitter Breakdown Voltage – 80 V minimum
2. High Isolation Resistance, 1011 W Typical
3. Standard Plastic DIP Package

Maximum Ratings


1. Emitter
Peak Reverse Voltage : 3 V
Continuous Forward Current : 60 mA
Power Dissipation at 25°C : 100 mW
Derate Linearly from 55°C :  1.33 mW/°C

2. Detector
Collector-Emitter Breakdown Voltage, BVCEO : 80 V
Emitter-Collector Breakdown Voltage BVECO : 5 V
Collector (load) Current : 125 mA
Power Dissipation at 25°C Ambient : 150 mW
Derate Linearly from 25°C : 2.0 mW/°C


IL55B Datasheet PDF

IL55B pdf