SFH615A-3X018

Overview

The SFH615A-3X018 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output housed in a 4-SMD surface-mount package. The device provides 5300 Vrms isolation voltage between input and output circuits. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 50 mA, and a forward current rating of 60 mA. The current transfer ratio ranges from 100% to 200%. Typical switching characteristics include a rise time of 3 µs and a fall time of 14 µs. Power dissipation is rated at 150 mW, with an operating temperature range spanning -55°C to +100°C.

Feature Summary

• Provides high-voltage galvanic isolation via 5300 Vrms dielectric strength for noise immunity.
• Utilizes an NPN phototransistor output stage suitable for digital signal transmission.
• Designed for surface-mount assembly using a compact 4-SMD footprint.

Applications

• General-purpose digital signal isolation in industrial control systems
• Interface circuits for microcontrollers and logic families
• Power supply feedback loops requiring electrical separation

Procurement Notes

Verify the specific suffix X018 confirms the 4-SMD surface-mount package variant rather than through-hole DIP versions within the SFH615A family. Confirm the current transfer ratio bin corresponds to the 100-200% specification required for the application. Ensure RoHS compliance documentation is available as per manufacturer standards. Cross-reference the exact part number against official Vishay distributors to avoid confusion with similar pin-compatible alternatives.

Selection Notes

Select this component when surface-mount technology is required for high-isolation applications. The 5300 Vrms rating supports safety standards for mains-connected equipment. The NPN output interface simplifies connection to standard logic inputs. Consider the 100-200% CTR range for adequate noise margin in noisy environments. Verify that the 50 mA collector current limit meets the load requirements of the receiving circuitry.

Part Context

This component belongs to the SFH615A series of transistor output optocouplers from Vishay. The series includes various packaging options such as DIP-4 and SMD variants. The SFH615A-3X018 specifically denotes the surface-mount version with a defined current transfer ratio bin. It shares core electrical characteristics with other members of the family but differs in physical form factor and mounting style.

Replacement Considerations

The VO615A-3 is listed as a recommended alternative. Verify pinout compatibility and ensure the replacement maintains the 5300 Vrms isolation rating and NPN output configuration. Check that the substitute part meets the same 100-200% current transfer ratio specifications.