RE46C140S16TF

Sensor And Detector Interfaces Overview

The RE46C140S16TF is a CMOS photoelectric smoke detector ASIC manufactured by Microchip Technology. It operates on a supply voltage of 5V to 12V with typical standby currents of 4µA to 8µA and active currents up to 3mA. The device features an internal oscillator strobing power every 10 seconds, interconnect capability for up to 40 detectors, and a 10-minute timer mode. It supports temporal horn patterns compliant with NFPA 72 and includes low battery and chamber integrity checks.

Sensor And Detector Interfaces Feature Summary

• Integrated gain-selectable photo amplifier for infrared emitter/detector pairs
• Bidirectional interconnect pin enabling multi-unit synchronization
• Internal diagnostic modes for push-button testing and chamber integrity verification
• UL recognized per File S24036 for use in UL217 and UL268 compliant detectors

Sensor And Detector Interfaces Applications

• Photoelectric smoke detection systems
• Multi-unit interconnected fire alarm networks
• Emergency evacuation signaling devices

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix 'S16TF' against the manufacturer's current datasheet to confirm packaging type and RoHS compliance status. Ensure the ordering documentation matches the exact part number to avoid discrepancies in package style or environmental certifications.

Sensor And Detector Interfaces Selection Notes

Select this component for applications requiring minimal external components and low quiescent current consumption. Consider the 16-pin SOIC package availability and verify that the required sensitivity settings align with the capacitor configurations available on pins C1 and C2.

Sensor And Detector Interfaces Part Context

This IC belongs to the RE46C140 family of photoelectric smoke detector ASICs. It is designed to replace discrete component solutions by integrating signal processing, timing, and output driving capabilities into a single CMOS chip for compact detector designs.

Sensor And Detector Interfaces Replacement Considerations

RE46C140SW16TF

Sensor And Detector Interfaces FAQ

How does the interconnect feature function?

The bidirectional IO pin allows multiple detectors to be connected so that when one unit alarms, all units sound. It includes protection circuitry for varying supply voltages and a digital filter to ignore pulsed signals from other alarm types.

What is the purpose of the 10-minute timer mode?

The timer mode reduces sensitivity for a 10-minute period by switching the smoke comparator reference to an external voltage on the VSEN pin, allowing temporary adjustment of detection thresholds.

How is the low battery condition detected?

An internal reference compares the divided VDD supply voltage. If the voltage falls below the threshold (typically around 7.2V), the horn chirps every 43 seconds until the condition is resolved.