SFH6318T

Overview

The SFH6318T is a high-speed optocoupler featuring a single channel with a transistor output that includes a base terminal. It provides 4000Vrms isolation voltage and supports data rates up to 100 kbd. The device operates within a temperature range of -55°C to 100°C and is housed in an 8-SOIC surface-mount package. Key electrical parameters include a maximum forward current of 20 mA, a typical forward voltage of 1.4 V, and a collector-emitter voltage of 18 V. The current transfer ratio ranges from 500% to 2600% at 1.6 mA input, with typical turn-on and turn-off times of 600 ns and 1.5 µs respectively.

Feature Summary

• Integrates an LED with a high-gain phototransistor detector for enhanced signal transmission efficiency.
• Provides robust electrical isolation capability suitable for noise-sensitive circuit environments.
• Features a base terminal on the output transistor to allow for faster switching speeds and improved linearity.

Applications

• Industrial communication interfaces requiring galvanic isolation
• Signal isolation in measurement and control systems
• Power supply feedback loops for safety compliance

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches the required 8-SOIC footprint. Ensure storage conditions comply with moisture sensitivity level requirements prior to soldering. Cross-reference ordering suffixes with distributor catalogs to ensure correct tape-and-reel or cut-tape availability. Validate RoHS compliance status if restricted substance regulations apply to your manufacturing process.

Selection Notes

Select this component when high current transfer ratio and moderate speed isolation are required. The integrated base allows for external control of saturation, improving switching performance compared to standard transistors. Consider thermal management as power dissipation occurs primarily in the input LED. Verify that the 18V output voltage rating meets the downstream circuit requirements. Evaluate the 4000Vrms isolation barrier for adequate creepage and clearance distances in the final PCB layout.

Part Context

The SFH6318T belongs to Vishay's SFH63xx series of high-speed optocouplers designed for general-purpose isolation applications. This series emphasizes high gain and fast response times within compact surface-mount packages. The device complements other variants in the family that may offer different channel counts or output types, providing designers with flexible options for balancing speed, isolation, and cost in industrial and consumer electronics designs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official cross-reference guides or contact the manufacturer directly for verified equivalent components that match the specific electrical and mechanical parameters.