Description
The LH1540 is robust, ideal for telecom and ground fault applications. It is a SPST normally open switch (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 highvoltage 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
• Isolation Test Voltage 5300 VRMS
• Typical RON 20 Ω, max 25 Ω
• Load Voltage 350 V
• Load Current 120 mA
• High Surge Capability
• Clean Bounce Free Switching
• Low Power Consumption
• High Reliability Monolithic Detector
• SMD lead available on tape and reel
• Lead-free component
• Component in accordance to RoHS 2002/95/EC and WEEE 2002/96/EC

Applications
    General Telecom Switching
        - On/off Hook Control
        - Ring Delay
        - Dial Pulse
        - Ground Start
        - Ground Fault Protection
    Instrumentation
    Industrial Controls
    See "Solid State Relays" (Application Note 56)