onsemi 6N138SDM

The 6N138SDM is a high-performance, single-channel optocoupler produced by onsemi. It belongs to the family of optocouplers that include the 6N138M and 6N139M models. This component is designed to provide reliable and efficient optical isolation between input and output circuits, making it suitable for a wide range of applications requiring high-speed and low-noise operation.

The 6N138SDM features an AlGaAs LED optically coupled to a high-gain split Darlington photodetector, which enables lower output saturation voltage and higher speed operation compared to conventional Darlington phototransistor optocouplers. This device is particularly useful for interfacing with MOS, CMOS, LSTTL, and EIA RS232C logic circuits.

• Low Input Current: The 6N138SDM operates with a very low input current of 0.5 mA, making it energy-efficient.
• High Current Transfer Ratio (CTR): With a CTR of 2000%, this optocoupler ensures high efficiency in signal transfer.
• Superior Common Mode Rejection (CMR): It offers exceptional CMR of 10 kV/μs, providing robust noise immunity.
• Dual and Single Channel Options: Although the 6N138SDM is a single-channel device, the family includes dual-channel options like the HCPL2730M and HCPL2731M.
• Safety and Regulatory Approvals: The device complies with UL1577, DIN EN/IEC60747-5-5, and other safety standards.
• Pb-Free and RoHS Compliant: The 6N138SDM is lead-free and compliant with RoHS regulations.

• Digital Logic Ground Isolation: Ideal for isolating digital logic circuits to prevent ground loops and noise.
• Telephone Ring Detector: Used in telephone systems to detect ring signals while maintaining electrical isolation.
• EIA-RS-232C Line Receiver: Suitable for serial communication interfaces requiring high-speed and low-noise operation.
• High Common Mode Noise Line Receiver: Effective in environments with high common mode noise.
• I²C Bus Isolation: Ensures reliable communication over I²C buses by providing electrical isolation.
• Current Loop Receiver: Used in industrial control systems for current loop communication.

1. What is the typical input current of the 6N138SDM?

   The typical input current is 0.5 mA.

2. What is the current transfer ratio (CTR) of the 6N138SDM?

   The CTR is 2000%.

3. What is the common mode rejection (CMR) of the 6N138SDM?

   The CMR is 10 kV/μs.

4. What are the operating and storage temperature ranges for the 6N138SDM?

   The operating temperature range is -40 to +100 °C, and the storage temperature range is -40 to +125 °C.

5. Is the 6N138SDM Pb-free and RoHS compliant?

   Yes, it is Pb-free and RoHS compliant.

6. What safety standards does the 6N138SDM comply with?

   It complies with UL1577, DIN EN/IEC60747-5-5, and other relevant safety standards.

7. What are some common applications of the 6N138SDM?

   Common applications include digital logic ground isolation, telephone ring detection, EIA-RS-232C line receivers, high common mode noise line receivers, I²C bus isolation, and current loop receivers.

8. How does the 6N138SDM ensure high-speed operation?

   The device features a split Darlington configuration that separates the input photodiode and the first stage gain from the output transistor, allowing for lower output saturation voltage and higher speed operation.

9. What is the maximum working insulation voltage of the 6N138SDM?

   The maximum working insulation voltage is 1414 Vpeak.

10. What is the external creepage and clearance of the 6N138SDM?

    The external creepage is ≥8.0 mm, and the external clearance is ≥7.4 mm.