DESCRIPTION
The LH1529A and LH1529B Telecom switches consist of an optically coupled solid state relay (SSR) and a bidirectional input optocoupler. The SSR is ideal for performing switchhook and dial-pulse switching while the optocoupler performs ring detection and loop current sensing functions. Both the SSR and optocoupler provide 5300 VRMS of input to output isolation.

FEATURES
• Solid State Relay and Optocoupler in One Package
• Surface Mount Package
• l/O Isolation, 5300 VRMS
• LH1529A, CTR Min.=33%
• LH1529B, CTR Min.=100%
• Optocoupler
    – Bidirectional Current Detection
• Solid-state Relay
    – See LH1540 Data Sheet
    – Typical RON 20 Ω
    – Load Voltage 350 V
    – Load Current 120 mA
    – Current Limit Protection

APPLICATIONS
• General Telecom Switching
    – On/off Hook Control
    – Dial Pulse
    – Ring Current Detection
    – Loop Current Sensing
• See Appnote 56