Description: Optocoupler 6N137 6N-137 Optocoupler IC High Speed Transistor DIP 8 Pin Optocoupler Optoisolater Integrated Circuit
Optocoupler 6N137 6N-137 Optocoupler IC High Speed Transistor DIP 8 Pin Optocoupler Optoisolater Integrated Circuit
6N137 is a single-channel high-speed optoisolator. Every optocoupler comes with a different feature to solve the requirement in every situation. An optocoupler name 6N137 is designed as one of the high-speed optocouplers. This optocoupler comes up with 10Mbit/sec speed which uses as optocoupler between two circuits for multiple purposes. IC 6N137 internally comes up IR transmitter but the receiver end comes up with an NMOS transistor which keeps it protected from leakage.
The recommended operating voltage for IC is 5V but at the output side, it does not support the switching of high load which makes it suitable only for LOW voltage devices. It also comes up with an enable pin which makes it handy for using in-circuit of flash for the camera. Optocoupler can work with both AC and DC but using it with any circuit a 0.1uF capacitor is recommended. So, in those cases where high-speed optocoupler is needed the IC will be a perfect device to remove the noise and data conversion.
6N137 Features and Specifications
- High Speed Optocoupler (10Mbit/s)
- Maximum Supply voltage: 7V (Typically 5V)
- Input forward voltage: 1.1V to 1.7V
- Minimum Logic high voltage: 2V
- Maximum Logic low voltage: 0.8V
- Output sink current: 7mA (max)
- Propagation delay: 50ns (approx.)
- Available as 6-pin DIP and SMD Packages
Equivalent for 6N137 Optocoupler
MOC3021 (Zero-crossing), MCT2E (non-Zero transistor), MOC3041 (Non-Zero Cross TRIAC), FOD3180 (High-Speed MOSFET), PC817, 4N25
Where to use 6N137 Optocoupler?
The 6N137 is a High Speed Optocoupler or Optoisolator. As we know the term Optocoupler/optoisolater means we use light to indirectly couple (isolate) two sets of circuits. The speciality of 6N137 is that it has a high speed LED and hence can switch at 10Mbit/sec the output is NAND gate logic with an open drain transistor as one input and Enable pin as another input.
The typical operating voltage of 6N137 is only 5V hence it cannot switch high loads and can also sink a maximum of only 7mA on its output side. So if you looking for some high voltage AC/DC switching try the 6N137. Apart from that the IC also has an Enable pin which comes in handy while designing a strobe circuit for your camera flash.
So if you are looking for a high speed optocoupler for some digital applications like data conversion or noise elimination then this IC might be of interest to you.
How to use 6N137?
Even though 6N137 is capable of working with both AC and DC it is commonly used with Digital circuits and works with 5V as supply voltage. A typical application circuit for 6N137 from datasheet is shown below.
The Capacitor 0.1uF is a bypass capacitor across the Supply rail. The input signal should has an impedance of minimum 50 ohms with rise time and falls of 5nS of greater for the IC to respond. The input signal can be probed (if required) on pin 3 and the pull down resistor Rm is optional and can be used only if you are connecting the signal to scope.
As told earlier the output (pin 6) is an open drain transistor and hence it can either sink current or remain floating. So to avoid floating we should use a pull up resistor RL, the value of RL can be between 330 ohm to 4K depending upon the load connected.
The pin 7 is the Enable pin, this pin has an in-built pull up resistor hence by default the IC is enabled when powered. When connected to ground it will disable the output. The pin can be put into use to create strobe circuits etc.. The below truth table will help you understand the working of Enable pin.
Since the output is of open drain type, note that when the input is high the output will be low and vice versa. Since the IC is commonly used for fast switching another thing to consider is the propagation delay. When the input is logic on the output turn off only after 48ns (TELH) and when the input is logic off the output turns on only after 50ns (TEHL). The same can be understood with the below switching diagram.
- Camera Strode lights
- High speed ADC and DAC
- Fibre/optic communication
- Noise isolation circuits
- Input / Output isolation circuits
- 1 x Optocoupler 6N137 6N-137 Optocoupler IC High Speed Transistor DIP 8 Pin Optocoupler Optoisolater Integrated Circuit