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