SFH615A-3X018T

Overview

The SFH615A-3X018T is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output and utilizes a surface-mount 4-SMD package. The device provides high isolation voltage of 5300 Vrms with low coupling capacitance. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 50 mA, and a forward voltage of approximately 1.35 V to 1.65 V depending on test conditions. The current transfer ratio ranges from 100% to 200%, with a typical rise time of 3 µs and fall time of 14 µs. It operates within a temperature range of -55°C to +100°C.

Feature Summary

• High isolation voltage capability for safe signal transmission between isolated circuits
• Low coupling capacitance design to minimize noise interference
• Surface-mount packaging suitable for automated assembly processes

Applications

• General purpose signal isolation in industrial control systems
• Interface between microcontrollers and high-voltage power stages
• Solid-state relay driver circuits

Procurement Notes

Verify the specific current transfer ratio bin required for your application, as the SFH615A-3X018T may be available in different CTR variants. Confirm that the surface-mount footprint matches your PCB layout constraints. Ensure compliance with RoHS directives if applicable to your manufacturing region. Cross-reference the datasheet revision date to confirm parameter accuracy against older versions.

Selection Notes

Select this component when a surface-mount form factor is required for single-channel isolation with moderate speed requirements. Compare the 50 mA collector current limit against your load requirements. Consider the 5300 Vrms isolation rating for safety compliance in mains-connected applications. Evaluate the thermal dissipation capabilities within the DIP-4 equivalent SMD package for your enclosure design.

Part Context

This part belongs to the SFH615A series of transistor output optocouplers. It shares functional similarities with through-hole equivalents like the VO615A-3 but offers surface-mount convenience. The '3' suffix typically denotes a specific current transfer ratio range compared to other variants in the family. It is designed for general-purpose isolation tasks where board space is limited.

Replacement Considerations

The VO615A-3 is listed as a recommended alternative, though it uses a through-hole DIP-4 package rather than surface mount. Direct pin-for-pin replacement requires verifying the mechanical footprint compatibility. Other SFH615A variants with different CTR bins or packaging styles may serve as substitutes if electrical parameters align.