Description
6N139 is an optocoupler IC designed for isolating primary circuit and secondary circuit electrically but the pair of LED and photodiode – Darlington setup forms the triggering mechanism between the two sides. The chip designed for Low input current, high gain, and High speed switching applications.
6N139 Pin Configuration
6N139 is an eight pin device and function of each pin is stated below. The device is available in various packages for choosing.
| Pin Number | Pin Name | Description |
| 1 | NC | No connection |
| 2 | Anode | Positive terminal of internal LED |
| 3 | Cathode | Negative terminal of internal LED |
| 4 | NC | No connection |
| 5 | GND | Emitter of internal Darlington transistor which is connected to ground pin in circuit |
| 6 | VO | Collector of second transistor Darlington setup which is usually connected to load to receive current |
| 7 | VB | Base of second transistor Darlington setup |
| 8 | VCC | Collector of first transistor Darlington setup which is connected to positive power supply |
6N139 Features and Specifications
- CMOS, LSTTL compatibility
- High current transfer ratio
- Additional base pin access allows gain bandwidth adjustment
- Low input current requirements – 0.5 mA
- High output current
- Interfaces with common logic families
- High common mode rejection, 500 V/μs
- Performance guaranteed over temperature range: 0°Cto 70°C
- IR LED forward voltage for turning ON (VF): 1.4V
- Maximum IR LED forward voltage: 1.7V
- Maximum IR LED forward current during ON (IF): 25mA
- Maximum IR LED reverse voltage: 5V
- Maximum IR LED reverse current: 10uA
- Maximum supply and output voltage (Pin 8 to 5, pin 6 to 5): 18V
- Maximum current allowed trough transistor collector(IC): 60mA
- Current transfer ration (CTR): 400%
- Maximum output power dissipation: 100mW
6N139 Optocoupler Overview
6N139 IC is basically used when you want to isolate two circuits electrically but still want to have a direct control mechanism. The device applications are many and a few main are stated below
- 6N139 can be used in applications where control unit can only provide low current signals. This is because of Darlington pair the gain of output is very high leading to the device being capable of driving at very low input current.
- 6N139 can be used in applications where switching frequency is high because the device being specifically designed to be installed in high frequency switching applications.
Applications
- Digital logic ground isolation
- Telephone ring detector
- Lighting systems
- PWM applications
- AC mains detection
- Reed relay driving
- Switch mode power supply feedback
- Telephone ring detection
- High common mode noise line receiver
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