DESCRIPTION
The LH1540 is robust, ideal for telecom and ground fault applications. It is a SPST normally open switch (1 Form A) that replaces electromechanical relays in many applications. It is constructed using a GaAIAs LED for actuation control and an integrated monolithic die for the switch output. The die, fabricated in a high-voltage dielectrically isolated technology, is comprised of a photodiode array, switch control circuitry and MOSFET switches. In addition, it employs current-limiting circuitry which meets FCC 68.302 and other regulatory voltage surge requirements when overvoltage protection is provided.

FEATURES
• Current Limit Protection
• l/O Isolation, 5300 VRMS
• Typical RON 20 Ω, max 25 Ω
• Load Voltage 350 V
• Load Current 120 mA
• High Surge Capability
• Linear, AC/DC Operation
• Clean Bounce Free Switching
• Low Power Consumption
• High Reliability Monolithic Receptor
• SMD lead available on tape and reel
• Flammability; UL94,VØ

APPLICATIONS
• General Telecom Switching
    – On/off Hook Control
    – Ring Delay
    – Dial Pulse
    – Ground Start
    – Ground Fault Protection
• Instrumentation
• Industrial Controls
• See Application Note 56