RE46C141E16F

Sensor And Detector Interfaces Overview

The RE46C141E16F is a CMOS photoelectric smoke detector ASIC designed for standalone or interconnected fire alarm systems. It operates on a supply voltage range of 6V to 12V with typical standby currents of 5.5µA at 12V and 4µA at 9V. The device features an internal oscillator that powers the detection circuitry for 100µs every 8.1 seconds in standby mode, increasing frequency upon smoke detection. It supports temporal horn patterns compliant with NFPA 72 standards and includes interconnect capabilities for up to 40 detectors. The IC provides low battery monitoring, chamber integrity testing, and high-gain modes for push-button testing.

Sensor And Detector Interfaces Feature Summary

• Integrated gain-selectable photo amplifier for infrared emitter/detector pairs
• Interconnect pin supporting multi-unit synchronization across up to 40 detectors
• Internal diagnostic modes for low battery status and photo chamber integrity verification
• Temporal horn pattern output compatible with standard emergency evacuation signals

Sensor And Detector Interfaces Applications

• Photoelectric smoke detection circuits requiring minimal external components
• Interconnected residential or commercial fire alarm systems
• Battery-powered smoke alarms utilizing alkaline or carbon batteries
• Devices requiring UL217 and UL268 compliance

Sensor And Detector Interfaces Procurement Notes

Verify component authenticity through authorized Microchip Technology distributors. Confirm RoHS compliance status and packaging type (PDIP-16) against specific order requirements. Ensure handling procedures account for ESD sensitivity despite internal protection mechanisms. Review datasheet revision history for any updates to electrical characteristics or application notes prior to final procurement.

Sensor And Detector Interfaces Selection Notes

Select this model for applications requiring photoelectric sensing with interconnect functionality. The PDIP-16 package suits through-hole assembly processes. Verify external component values for ROSC/COSC timing and photo amplifier gain capacitors against target sensitivity levels. Consider the 6V to 12V operating range when designing power supplies for varying battery states.

Sensor And Detector Interfaces Part Context

The RE46C141 series belongs to Microchip's R&E International line of specialized sensor interface ASICs. This specific variant utilizes a 16-pin PDIP package. It complements other models like the RE46C122 (ionization) by offering photoelectric detection capabilities within the same architectural framework, maintaining compatibility with similar system designs while differing in sensing methodology.

Sensor And Detector Interfaces Replacement Considerations

The RE46C141 is functionally compatible with the Motorola MC145012. Designers migrating from legacy parts should verify pinout alignment and timing parameter tolerances. No direct modern equivalents are listed; substitute selection requires matching the photoelectric ASIC architecture and interconnect logic.

Sensor And Detector Interfaces FAQ

How does the RE46C141 handle multiple detector interconnection?

The bidirectional IO pin allows connection of up to 40 detectors. In local alarm, it drives high immediately. It includes an NMOS discharge device active for 1 second post-alarm to clear line capacitance quickly.

What triggers the increase in detection rate during standby?

The internal oscillator normally powers the circuit every 8.1 seconds. If a valid smoke sample is detected, the period decreases to approximately 2 seconds after one sample, and further to 1 second after two consecutive samples.

How is the low battery condition monitored?

Every 32 seconds in standby, the device compares the divided VDD supply against an internal reference. If the voltage falls below the threshold set by external resistors, the horn chirps for 7.9ms every 32 seconds until the condition clears.