DESCRIPTION
The LH1540 relay is an SPST normally open switch (1 form A) in small-outline packages (SOP). It requires a minimal amount of LED drive current to operate, making them ideal for battery powered and power consumption sensitive applications.
The relays are constructed using a GaAlAs LED for actuation control and an integrated monolithic die for the switch output. The die, fabricated in a high-voltage dielectrically isolated BCDMOS technology, is comprised of a photodiode array, switch-control circuitry, and MOSFET switches. In addition, the relays employ current-limiting circuitry enabling it to pass lightning surge testing as per ANSI/TIA-968-B and other regulatory surge requirements when overvoltage protection is provided.

FEATURES
• High-speed operation
• Isolation test voltage 2500 VRMS
• Current-limit protection
• High surge capability
• Clean, bounce-free switching
• Extremely low power consumption
• High-reliability monolithic detector
• Surface-mountable
• Compliant to RoHS Directive 2002/95/EC and in accordance to WEEE 2002/96/EC

APPLICATIONS
• PCMCIA type 2 cards
• Battery powered switch applications
• General telecom switching
• Telephone line interface
   - On/off hook
   - Ring relay
   - Ground start
• Programmable controllers
• Instrumentation