RE46C317S8TF

Sensor And Detector Interfaces Overview

The RE46C317S8TF is a CMOS piezoelectric horn driver IC manufactured by Microchip Technology in an 8-lead SOIC package. It operates on a supply voltage range of 2V to 5V, with typical operation at 3V. The device integrates a boost converter that generates a nominal output voltage of 10V to drive piezoelectric horns. Electrical characteristics include a standby supply current of up to 1µA and a quiescent supply current of up to 49µA when the horn enable pin is low. The operating temperature range spans from -10°C to +60°C.

Sensor And Detector Interfaces Feature Summary

• Integrates a push-pull horn driver circuit capable of driving three-terminal piezoelectric transducers.
• Includes a built-in current-mode boost regulator for generating high-voltage drive signals.
• Features tri-state logic control via the Horn Enable pin for flexible power management.

Sensor And Detector Interfaces Applications

• Smoke Detectors
• CO Detectors
• Personal Security Products

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix 'S8TF' corresponds to the 8-lead Small Outline Integrated Circuit (SOIC) package with tape and reel packaging. Confirm that the component meets lead-free manufacturing standards as indicated by the JEDEC designator. Ensure compatibility with the required surface-mount assembly processes for the selected package type.

Sensor And Detector Interfaces Selection Notes

Select the RE46C317 variant over the RE46C318 if the application requires a tri-state Horn Enable input for distinct standby, boost-only, and active modes. Verify that the external inductor and capacitor values align with the typical application circuit requirements to maintain optimal boost converter efficiency and stability under varying load conditions.

Sensor And Detector Interfaces Part Context

This component belongs to the RE46C317/18 family of piezoelectric horn drivers. It serves as a direct functional replacement for the RE46C117 device while offering improved standby current performance. The S8TF designation specifically identifies the surface-mount SOIC variant intended for automated pick-and-place manufacturing.

Sensor And Detector Interfaces Replacement Considerations

The RE46C317 is documented as compatible with the RE46C117 device. Designers should verify pinout consistency and ensure that the external passive components are suitable for the lower standby current specifications of the RE46C317 series.

Sensor And Detector Interfaces FAQ

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

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

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

The RE46C317 utilizes tri-state logic for the HRNEN pin, whereas the RE46C318 uses binary logic with only two valid states: Low (Standby) and High (Active).

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

The internal boost converter generates a nominal output voltage of 10V, which is used to drive the piezoelectric horn.