RE46C317S8F

Sensor And Detector Interfaces Overview

The RE46C317S8F is a CMOS piezoelectric horn driver IC manufactured by Microchip Technology in an 8-lead SOIC package. It integrates a boost converter and a push-pull driver circuit for driving three-terminal piezoelectric horns on 2V to 5V supplies. The device features a tri-state Horn Enable (HRNEN) input with valid states of low, high, and tri-state. Electrical characteristics include a typical standby supply current of 0.5 µA at HRNEN float, a nominal boost output voltage of 10V, and a maximum operating temperature of +60°C.

Sensor And Detector Interfaces Feature Summary

• Integrated boost converter provides approximately 10V output from a low-voltage battery source.
• Push-pull horn driver circuit capable of driving three-terminal piezoelectric transducers.
• Tri-state logic control allows distinct standby, boost-only, and active operation modes via the HRNEN pin.

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 'S8F' corresponds to the 8-lead Small Outline Integrated Circuit (SOIC) package with lead-free finish. Confirm that the application design accommodates the specified operating temperature range of -10°C to +60°C. Ensure external components meet the peak current and resistance requirements detailed in the datasheet for proper boost regulator function.

Sensor And Detector Interfaces Selection Notes

Select the RE46C317 variant over the RE46C318 when a tri-state Horn Enable input is required to support a dedicated standby mode where all circuits are disabled. Verify that the system power supply operates within the 2V to 5V range. Ensure the external inductor and capacitor values align with the typical application circuit recommendations to maintain stable boost regulation.

Sensor And Detector Interfaces Part Context

This component belongs to the RE46C317/18 family of piezoelectric horn drivers. It is designed as a drop-in replacement for the RE46C117 device while offering lower standby current consumption. The S8F designation specifically identifies the surface-mount SOIC package configuration within this product line.

Sensor And Detector Interfaces Replacement Considerations

The RE46C317 is documented as compatible with the RE46C117 device. Designers should verify pinout compatibility and ensure the target application can utilize the lower standby current specifications provided by the RE46C317 series.

Sensor And Detector Interfaces FAQ

What are the valid logic states for the HRNEN pin on the RE46C317?

The RE46C317 supports three valid states for the HRNEN pin: Tri-state (Standby mode), Low (Boost-Only mode), and High (Normal Operation mode).

How does the RE46C317 differ from the RE46C318 regarding control logic?

The RE46C317 utilizes tri-state logic for the Horn Enable input, whereas the RE46C318 uses binary logic with only two valid states (Low and High).

What is the nominal output voltage generated by the internal boost converter?

The boost converter generates a nominal output voltage of 10V at the VO pin when enabled.