6N137 SDM Detai LED explanation of pin function specifications and circuit principle instructions

The model " 6N137SDM " corresponds to an optocoupler (also known as an optoisolator) from ON Semiconductor (previously part of Fairchild Semiconductor), which is commonly used for isolating different parts of a circuit while allowing signal transfer. The 6N137SDM is a high-speed optocoupler used for digital signal isolation.

Packaging:

The 6N137SDM typically comes in a DIP-8 (Dual Inline Package with 8 pins) form factor.

Pin Function Specifications:

Pin Number Pin Name Pin Function Description 1 Anode (A) The anode of the LED inside the optocoupler. This pin receives a current input from the driving circuit. 2 Cathode (K) The cathode of the LED. It is connected to the ground side of the circuit. This pin is essential for controlling the current flow through the LED. 3 NC (No Connection) This pin is not connected internally and does not serve any function. 4 Ground (GND) Ground connection for the device. All internal circuitry of the 6N137SDM is referenced to this pin. 5 Output (Vo) This is the output of the photo transistor , which conveys the signal after it has been optically isolated. It is typically connected to the base of the external transistor for driving applications. 6 NC (No Connection) No internal connection. 7 Vcc (Supply Voltage) This pin provides the supply voltage for the internal circuitry of the optocoupler. Typically ranges from 4.5V to 5.5V. 8 Vcc (Supply Voltage) Another connection for Vcc, ensuring the device is powered with the proper voltage.

Circuit Principle:

The 6N137SDM operates based on the principle of optical isolation. It contains an LED (Light Emitting Diode ) and a phototransistor. The LED is driven by the input signal, which causes it to emit light. This light is then detected by the phototransistor on the other side, which switches in response. The phototransistor is connected in a way that it can drive or transmit a signal based on the input light, but electrically isolates the input from the output, providing protection against voltage spikes or noise.

Pin Function FAQ (20 Common Questions)

1. What is the primary function of the 6N137SDM? The primary function of the 6N137SDM is to provide optical isolation between circuits, ensuring that signals can be transferred while protecting the system from voltage surges.

2. How many pins does the 6N137SDM have? The 6N137SDM has a total of 8 pins.

3. What is the function of pin 1 in the 6N137SDM? Pin 1 is the anode of the internal LED and is used to receive a current input from the driving circuit.

4. What is the purpose of pin 4 on the 6N137SDM? Pin 4 is the ground pin (GND), which is used to reference the internal circuitry to the ground of the system.

5. Does the 6N137SDM require a specific voltage range? Yes, the 6N137SDM operates with a supply voltage (Vcc) typically between 4.5V and 5.5V.

6. Can pin 3 of the 6N137SDM be used for anything? Pin 3 is marked as "NC" (No Connection) and does not serve any purpose in the circuit.

7. How is the output signal obtained from the 6N137SDM? The output signal is obtained from pin 5, where the phototransistor delivers the isolated signal after detecting light from the internal LED.

8. How does the optocoupler provide isolation? It uses an LED to transmit signals optically, and a phototransistor to receive and output the signal. The electrical isolation between the input and output is achieved through the lack of direct electrical contact.

9. What should be connected to the cathode of the LED (pin 2)? The cathode (pin 2) is typically connected to the ground side of the circuit.

10. How does the 6N137SDM behave at high speeds? The 6N137SDM is designed for high-speed digital signal transmission, typically with switching speeds up to 10Mbps.

11. Can the 6N137SDM be used for analog signals? The 6N137SDM is optimized for digital signals and may not perform well for analog signals due to its limited linearity.

12. What type of load can be connected to the output of the 6N137SDM? The output can drive a transistor or other devices in a switching configuration, but external components may be needed to handle higher power.

13. What happens if the input current is too high? Excessive input current to the LED can damage the optocoupler. A current-limiting resistor is typically used to prevent this.

14. How can the 6N137SDM be used for level shifting? It can be used for level shifting by isolating circuits with different voltage levels and enabling communication between them.

15. Is the 6N137SDM capable of handling high-frequency signals? Yes, it is designed to handle high-frequency digital signals, making it suitable for high-speed data transmission.

16. What is the role of the phototransistor in the 6N137SDM? The phototransistor receives light from the internal LED and converts it into an electrical signal that is then output on pin 5.

17. Can the 6N137SDM be used in a noisy environment? Yes, its optical isolation feature helps it operate reliably in noisy environments by preventing noise from affecting the input/output circuits.

18. What is the maximum voltage the 6N137SDM can handle? The maximum input voltage typically ranges from 4.5V to 5.5V for proper operation, but external circuits should limit the voltage appropriately.

19. What should I consider when choosing Resistors for the 6N137SDM? Resistors should be chosen based on the input current requirements for the LED and the required switching speed for the application.

20. Can the 6N137SDM be used in industrial applications? Yes, the 6N137SDM is suitable for industrial applications where signal isolation is necessary, especially in environments with electrical noise or high-voltage risks.

This detailed explanation provides a comprehensive overview of the 6N137SDM, including its pinout, functions, and common questions.