6N135 Optocoupler: Datasheet, Application, Equivalent

6N135 Pinout

Pin Description

6N135 Symbol

6N135 Footprint

6N135 3D Model

The 6N135 is a two-photodiode, single-channel high-speed optocoupler with transistor output. It operates by separating the input and output sides with an electrical insulating shield. Due to independent biasing voltages photodiode and transistor base-collector terminals, 6N135 delivers a very high bit transmission rate when compared to traditional optoisolators such as 4N24 and MOC2031.

Vishay Semiconductor Opto Division 6N135 technical specifications, attributes, parameters and parts with similar specifications to Vishay Semiconductor Opto Division 6N135.

• Isolation test voltages: 5300 VRMS

• TTL compatible

• High bit rates: 1 Mbit/s

• High common-mode interference immunity

• Bandwidth 2 MHz

• Open-collector output

• External base wiring possible

• Camera Strode lights

• High-speed ADC and DAC

• Fibre/optic communication

• Noise isolation circuits

• Input / Output isolation circuits 

In fact, the 6N135 and 6N137 are fairly similar; the main difference is that the 6N135 has transistor output while the 6N137 has NAND output. It now has a fast switching speed of 10Mbit/sec, compared to 1Mbit/sec for the 6N135.

The 6N135 transistor has a maximum operating voltage of 15V and an output current of 8mA with a peak of 16mA, making it appropriate for driving medium-level loads. Try the MOC3021 if you need some high-voltage AC/DC switching. Aside from that, the IC contains an Enable pin, which is useful for creating a strobe circuit for your camera flash.

Despite the fact that the 6N135 can work with both AC and DC, It works with a 5V supply voltage and is often used in digital circuits. From the datasheet, a typical application circuit for 6N135 is given below.

How to use 6N135

The 0.1uF bypass capacitor is connected to the supply rail. For the IC to respond, the input signal must have an impedance of at least 50 ohms and rise and fall times of at least 5nS. The input signal can be explored (if necessary) on pin 3, and the pull-down resistor 100 is only required if the signal is connected to a scope.

As previously stated, the output (pin 6) is an open-drain transistor, which means it can either sink or float current. To minimize floating, a pull-up resistor RL should be used. The value of RL can range from 330 ohms to 4K, depending on the load attached.

Pin 7 is the Enable pin, which has a built-in pull-up resistor, therefore the IC is enabled by default when powered. When connected to the ground, the output is disabled. The pin can be used to make strobe circuits and other things. The truth table below will help you understand how Enable pin works.

Truth Table

Because the output is open drain, the output will be low while the input is high and vice versa. Another factor to consider is the propagation time, which is important because the IC is typically used for quick switching. When the input is logic on, the output is only turned off after (TPHL), and when the input is logic off, the output is only turned on after (TPHL) (TPLH). The switching diagram below demonstrates the same concept.

Switching Diagram

Vishay, an important partner of Digi-Key, serves as a globally recognized manufacturer famous for its discrete semiconductors and passive electronic components. Their discrete semiconductors include diodes, MOSFETs, optoelectronics, etc and their passive components include resistors, inductors, capacitors, etc. These products are widely used for almost all kinds of electronic devices and equipment in the fields of industrial, computing, automotive, telecommunications, military, aerospace, and medical.

Note:  More details can be found at the 6N135 optocoupler datasheet shown below.