TCMD4000

Overview

The TCMD4000 is a quad-channel photodarlington optocoupler manufactured by Vishay Semiconductor Opto Division. It features four independent channels within a single SOP-16 package, providing high-density isolation solutions. The device offers a minimum current transfer ratio (CTR) of 600% and an insulation voltage of 3750 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 35 V, a maximum forward current of 60 mA, and a maximum collector current of 80 mA per channel. The unit operates within a temperature range starting at -40°C and has a power dissipation rating of 250 mW.

Feature Summary

• Integrates four independent photodarlington output channels in a compact surface-mount package for space-constrained designs.
• Provides high-voltage electrical isolation with a rated insulation voltage of 3750 Vrms between input and output circuits.
• Delivers high signal gain with a minimum current transfer ratio exceeding 600%, ensuring reliable logic-level interfacing.

Applications

• Industrial control systems requiring multi-channel signal isolation
• Data communication interfaces needing galvanic separation
• Power supply feedback loops for safety compliance

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant and tape-and-reel configuration match your assembly requirements. Confirm RoHS compliance status and lead-free specifications directly with the manufacturer or authorized distributors before placing orders. Ensure that the requested quantity aligns with standard packaging units to avoid partial reel issues during production.

Selection Notes

Select this component when multiple isolated channels are required in a single footprint to reduce board space. The high CTR makes it suitable for driving logic inputs directly without additional amplification. Consider the 35V output voltage limit and 80mA current capability to ensure compatibility with downstream circuit loads and operating conditions.

Part Context

The TCMD4000 belongs to the TCMD series of quad-channel optocouplers from Vishay. This series is designed for applications requiring multiple isolated signals in a small form factor. It complements other Vishay optoelectronic products by offering integrated multi-channel solutions, simplifying design complexity compared to using discrete single-channel devices.

Replacement Considerations

Direct substitutes may include other quad-channel photodarlington optocouplers with similar SOP-16 packages and comparable isolation voltages. Verify pinout compatibility and electrical parameters such as CTR and voltage ratings before swapping components to ensure circuit functionality remains intact.