What the 300 µA supply current means for your design
The RE46C318S8F draws 300 µA from the supply — this is the total operating current for the horn driver IC itself, not including the piezo load. In a battery-powered smoke or CO alarm, that quiescent draw sits well below the standby current of the typical 9 V battery, so the device can listen for an alarm condition continuously without draining the cell between events. The input and output are both voltage-type, meaning the driver accepts a logic-level trigger and outputs a voltage signal to drive a piezo transducer directly. No external amplifier stage is needed between the microcontroller GPIO and the horn element.
Package and hand-solderability
The 8-SOIC footprint is a standard JEDEC outline, so existing land patterns for generic SOIC-8 parts work without modification. The surface-mount package suits automated assembly lines as well as prototype boards — no through-hole variant exists, but the 8-SOIC is one of the most hobbyist-friendly SMD packages to work with on a breakout or perfboard.
Temperature range and deployment context
Rated for -10°C to 60°C ambient, the RE46C318S8F is specified for indoor commercial and residential environments — think smoke detectors, carbon monoxide alarms, and security system sounders.