RE46C318S8TF

Sensor And Detector Interfaces Overview

The RE46C318S8TF is a CMOS piezoelectric horn driver IC manufactured by Microchip Technology, housed in an 8-lead Small Outline Integrated Circuit (SOIC) package with a 3.90 mm body width. It operates on a supply voltage ranging from 2V to 5V and includes a built-in boost converter that generates a nominal output voltage of 10V for driving piezoelectric transducers. The device features standard logic control via the Horn Enable (HRNEN) pin, which toggles between two states: Low for standby mode where circuits are disabled, and High for normal operation enabling both the boost regulator and horn driver. It supports continuous output currents up to 40mA and functions within an operating temperature range of -10°C to +60°C.

Sensor And Detector Interfaces Feature Summary

• Integrated push-pull horn driver circuit capable of driving three-terminal or modified two-terminal piezoelectric horns
• Built-in current-mode boost converter controller providing cycle-by-cycle current limiting and constant output voltage regulation
• Binary logic control interface utilizing HRNEN pin to switch between low-power standby and active drive modes

Sensor And Detector Interfaces Applications

• Smoke detectors
• CO detectors
• Personal security products
• Electronic toys

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix 'S8TF' corresponds to the 8-lead SOIC package and tape-and-reel configuration as defined in the manufacturer's product identification system. Confirm that the lead-free designation matches current environmental compliance requirements such as RoHS standards before finalizing procurement orders.

Sensor And Detector Interfaces Selection Notes

Select the RE46C318 over the RE46C317 when only binary high and low enable states are required for the application design. Ensure external components, specifically the inductor and capacitors, meet the recommended specifications to support the internal boost converter's peak current demands and maintain stable output voltage under load conditions.

Sensor And Detector Interfaces Part Context

This component belongs to the RE46C317/18 family of piezoelectric horn drivers designed for battery-powered applications. It serves as a direct functional replacement for the RE46C117 while offering lower standby current consumption. The RE46C318 variant is distinguished by its simplified two-state logic control compared to the tri-state capability found in the RE46C317 model.

Sensor And Detector Interfaces Replacement Considerations

The RE46C317 is a compatible alternative within the same datasheet specification. Designers must account for the difference in Horn Enable logic, as the RE46C317 supports a tri-state input while the RE46C318 utilizes standard binary logic.