TCLT1117

Overview

The TCLT1117 is a transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an infrared emitting diode coupled to a phototransistor with a base lead for improved switching performance. The device provides electrical isolation of 5000Vrms between input and output circuits. Key electrical parameters include a current transfer ratio (CTR) range of 80% to 160% at a forward current of 5mA. Typical switching times are specified as 5µs for turn-on and 3µs for turn-off, with rise and fall times of 3µs and 4µs respectively. The maximum DC forward current is 60mA, and the output channel current rating is 50mA.

Feature Summary

• High voltage isolation capability of 5000Vrms for safe circuit separation
• Phototransistor output includes a dedicated base terminal to enhance switching speed and control
• Wide current transfer ratio range ensures reliable signal transmission across varying conditions
• Designed for high-speed digital signal isolation applications

Applications

• High-voltage isolation in industrial control systems
• Signal coupling in power supply feedback loops
• Interface circuits for microcontrollers requiring galvanic isolation
• Digital communication channels where noise immunity is critical

Procurement Notes

Verify the specific ordering suffix and package variant when sourcing, as Vishay may offer different tape and reel configurations or lead-free status options. Confirm that the received component matches the 6-SOIC (0.295 inch width) footprint and pinout requirements of your design. Ensure compliance with RoHS directives if required by your manufacturing standards. Cross-reference the manufacturer part number with official distributor catalogs to avoid counterfeit components.

Selection Notes

Select this component when a phototransistor output with a base lead is necessary for faster switching than standard couplers. The 80-160% CTR range offers flexibility for various drive currents. Consider the 5000Vrms isolation rating for safety-critical applications. Evaluate the 5µs/3µs switching speeds against your system's timing requirements. The SOP-6L5 package suits surface-mount assembly processes.

Part Context

The TCLT1117 belongs to Vishay's family of transistor output optocouplers designed for general-purpose isolation. It differs from logic-output isolators like the 6N137 by providing analog-compatible transistor switching rather than digital open-drain outputs. The inclusion of a base lead distinguishes it from basic phototransistor optocouplers, allowing external biasing to optimize response time. It serves as a robust solution for medium-speed digital isolation tasks.

Replacement Considerations

Direct replacements should be sought among Vishay's transistor output optocouplers with similar CTR ranges and isolation voltages. Verify pin compatibility and package dimensions before substitution. Components like the TCMT1117 share similar electrical characteristics but may differ in packaging or specific switching parameters. Always consult the latest datasheets for potential updates or obsolescence notices.