RE46C318S8F

Sensor And Detector Interfaces Overview

The RE46C318S8F is a CMOS piezoelectric horn driver IC manufactured by Microchip Technology, designed for 3V battery or battery-backed applications. It integrates a boost converter and a push-pull driver circuit suitable for driving piezoelectric horns. The device operates within a supply voltage range of 2V to 5V and features a low standby supply current of 0.1 µA maximum when HRNEN is low. The built-in boost regulator provides a nominal output voltage of 10V at VO. The S8F suffix indicates an 8-lead Small Outline Integrated Circuit (SOIC) package with a 3.90 mm body width, supplied in tape and reel format.

Sensor And Detector Interfaces Feature Summary

• Integrated boost converter providing approximately 10V output for piezoelectric horn drive
• Binary logic control via Horn Enable pin for standard high/low operation
• Optimized for ultra-low quiescent current in standby mode
• Push-pull output stage capable of driving three-terminal piezoelectric transducers

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 against official documentation to confirm package type and reel specifications. Confirm that the required operating temperature range aligns with the specified -10°C to +60°C limits. Ensure proper handling procedures are followed due to static sensitivity inherent to CMOS technology.

Sensor And Detector Interfaces Selection Notes

Select this component over the RE46C317 variant if tri-state logic control is not required, as the RE46C318 utilizes binary logic for simpler interface requirements. Verify that the external inductor and capacitor values match the typical application circuit recommendations to ensure stable boost converter performance.

Sensor And Detector Interfaces Part Context

This part belongs to the RE46C317/18 family of piezoelectric horn drivers. While functionally similar to the RE46C317, it differs in its Horn Enable logic structure. The RE46C318 specifically lacks the tri-state capability found in the RE46C317, offering only low and high states for boost and horn activation.

Sensor And Detector Interfaces Replacement Considerations

RE46C317 variants may serve as functional replacements if the system design can accommodate the additional tri-state logic inputs without conflict.

Sensor And Detector Interfaces FAQ

What is the difference between RE46C317 and RE46C318?

The RE46C317 supports three valid states for the Horn Enable pin (tri-state, low, and high), whereas the RE46C318 supports only two valid states (low and high).

How does the Horn Enable pin affect operation?

When HRNEN is low, both the boost converter and horn driver are disabled (Standby). When HRNEN is high, both circuits are enabled for normal operation.

What is the nominal output voltage of the internal boost converter?

The boost converter is designed to maintain a nominal output voltage of 10V at the VO pin.