XS170S

Overview

The XS170S is a multifunction telecom switch integrating a 350V, 100mA MOSFET relay and a phototransistor detector in an 8-pin surface mount package. It provides 3750V RMS isolation between input and output channels. The relay section features a maximum on-resistance of 50 Ω and switching speeds of 5 ms for both turn-on and turn-off times. The detector portion offers a current transfer ratio of up to 100% with a blocking voltage of 50V. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Integrates a single-pole normally-open (SPST-NO) MOSFET relay and a phototransistor detector within one compact package
• Provides high-voltage electrical isolation of 3750V RMS between the control inputs and load outputs
• Requires low drive power compatible with standard TTL and CMOS logic levels
• Eliminates mechanical wear through solid-state design ensuring arc-free operation without snubbing circuits

Applications

• Telecommunications line switching and tip/ring circuit management
• Modem switching for portable computing devices such as laptops and notebooks
• Medical equipment patient-to-equipment isolation interfaces
• Utility metering including watt-hour, water, and gas measurement systems

Procurement Notes

Verify the specific suffix designation when ordering to ensure the correct physical footprint matches the target PCB layout. Confirm that the surface mount variant aligns with automated assembly requirements. Review the absolute maximum ratings regarding soldering temperature limits to prevent thermal damage during wave soldering processes. Ensure input drive currents remain within specified thresholds to maintain reliable switching performance across the operational temperature range.

Selection Notes

Select this component for applications requiring simultaneous signal switching and status detection within a constrained board area. The integrated detector allows for monitoring the state of external lines without additional discrete components. Consider the 50 Ω on-resistance when calculating voltage drops across the load path. Verify that the 350V peak load voltage rating exceeds the maximum expected line voltages in the target telecommunications or instrumentation environment.

Part Context

This device belongs to the Clare XS170 series of multifunction telecom switches manufactured by IXYS Integrated Circuits Division. The series includes through-hole DIP and tape-and-reel variants alongside the surface mount option. These components are designed specifically for cost-sensitive electronic switching applications where space efficiency and high reliability are critical design constraints.

Replacement Considerations

Public confirmed substitute part numbers: None identified.