XS170

Overview

The XS170 is a multifunction telecom switch integrating a 350V, 100mA MOSFET relay and an optocoupler detector in a single package. It provides 3750V RMS isolation between input and output circuits. The device features a maximum on-resistance of 50 Ω and operates within a temperature range of -40°C to +85°C. Key electrical parameters include a peak load voltage of 350V, continuous load current of 100mA, and turn-on/turn-off times of 5ms each. Input control current ranges from 2mA to 50mA with a typical forward voltage drop of 1.2V.

Feature Summary

• Integrates a high-voltage MOSFET relay and phototransistor detector for combined switching and line monitoring capabilities
• Provides 3750V RMS galvanic isolation between control inputs and load outputs
• Compatible with TTL and CMOS logic levels for low drive power requirements
• Offers arc-free switching without the need for external snubbing circuits

Applications

• Telecommunications tip and ring circuit switching
• Modem switching for portable devices such as laptops and notebooks
• Medical equipment patient and equipment isolation
• Instrumentation multiplexers and data acquisition systems
• Security and industrial control hookswitch applications

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type availability, as options include standard DIP, surface mount, and tape and reel configurations. Ensure compliance with relevant safety certifications such as UL and CSA for intended end-use environments. Review absolute maximum ratings to prevent damage during soldering or operation.

Selection Notes

Select the appropriate package variant based on assembly requirements, choosing between through-hole DIP or surface mount versions. Evaluate thermal management needs as power dissipation derates linearly with increasing ambient temperature. Consider the specific isolation voltage requirements of the application to ensure the 3750V RMS rating provides adequate safety margins. Verify that the 50 Ω on-resistance meets the signal integrity standards of the connected load circuits.

Part Context

The XS170 belongs to a family of multifunction telecom switches designed for cost-sensitive applications requiring both switching and detection functions. Manufactured originally by Clare, Inc., these components are widely used in telecommunications infrastructure. The integration of relay and detector functions reduces board space and simplifies design compared to discrete solutions.

Replacement Considerations

The TS117P is documented as a similar multifunction telecom switch offering comparable functionality. Verify pin compatibility and electrical parameter alignment before substitution. Check for any differences in package dimensions or isolation ratings that might affect mechanical fit or safety compliance.