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Home  Technical Articles   6N137 Optocoupler: Pinout, Circuit, Applications

Nov 18 2020

6N137 Optocoupler: Pinout, Circuit, Applications

Description

The 6N137 is a single channel 10 Mbd optocoupler utilizing a high efficient input LED coupled with an integrated optical photodiode IC detector. The detector has an open drain NMOS-transistor output, providing less leakage compared to an open collector Schottky clamped transistor output.

6N137Catalog

Description

Pin Configuration

Features

Applications

Where to Use 6N137 Optocoupler?

How to Use 6N137 Optocoupler?

6N137 Equivalents

Package Outline

Popularity by Region

Product Manufacturer

Component Datasheet


Pin Configuration

6N137 Pinout

Pin No

Pin Name

Description

1

NC

No Connection - Cannot be used

2

Anode (A)

Anode pin of the IR LED. Connected to logic input

3

Cathode (C)

Cathode pin of the IR LED

4

NC

No Connection - Cannot be used

5

Ground

Ground pin of the IC

6

Output (VO)

The isolated Output pin of the Optocoupler

7

Enable (VE)

By default, it is enabled through a pull-up resistor.

8

Vcc

Powers the IC


Features

  • Choice of CMR performance of 15 kV/µs, 5 kV/µs, and 100 V/µs

  • High speed: 10 Mbd typical

  • + 5 V CMOS compatibility

  • Pure tin leads

  • Guaranteed AC and DC performance over temperature: - 40 °C to + 100 °C temperature range

  • Meets IEC 60068-2-42 (SO2) and IEC 60068-2-43 (H2S) requirements

  • Low input current capability: 5 mA

  • Lead (Pb)-free component

  • The component in accordance to RoHS 2002/95/EC and WEEE 2002/96/EC


Applications

  • Microprocessor system interface
  • PLC, ATE input/output isolation
  • Computer peripheral interface
  • Digital Fieldbus isolation: CC-link, DeviceNet, Profibus, SDS
  • High-speed A/D and D/A conversion
  • AC plasma display panel level shifting
  • Multiplexed data transmission
  • Digital control power supply
  • Ground loop elimination

Where to Use 6N137 Optocoupler?

The 6N137 is a High-Speed Optocoupler or Optoisolator. As we know the term Optocoupler/optoisolator 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 Optocoupler?

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 the datasheet is shown below.

6N137 application circuit

The Capacitor 0.1uF is a bypass capacitor across the supply rail. The input signal should have an impedance of minimum 50 ohms with rising 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 pulldown 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 ohms 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.

6N317 truth table

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.

6N137 switching diagram


6N137 Equivalents

HCPL4503M

Alternatives Opto-couplers :MOC3021 (Zero-crossing), MCT2E (non-Zero transistor), MOC3041 (Non-Zero Cross TRIAC), FOD3180 (High-Speed MOSFET),  PC817, 4N25


Package Outline

6N137 package outline

6N137 Package


Popularity by Region

6N137 popularity


Product Manufacturer

Vishay Intertechnology was founded in 1962 by Dr. Felix Zandman. It began operations with one technology that had two product lines: foil resistors and foil resistance strain gages. In 1985, having grown from a start-up into the world’s leading manufacturer of these original products, the Company began an ongoing series of strategic acquisitions to become a broadline manufacturer of electronic components. Today, Vishay Intertechnology is one of the world’s largest manufacturers of discrete semiconductors and passive electronic components. These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical markets.


Component Datasheet

6n137 Datasheet

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