RE46C168S16TF

Sensor And Detector Interfaces Overview

The RE46C168S16TF is a CMOS photoelectric smoke detector ASIC manufactured by Microchip Technology. It operates on a supply voltage of 5V to 12V with typical standby current consumption of 4µA at 9V and maximum of 8µA at 12V. The device features a 16-pin SOIC-Wide package and supports an operating temperature range from -25°C to +75°C. It provides temporal horn patterns for alarm output, includes interconnect capability for up to 40 detectors, and incorporates internal low battery detection and chamber test functions.

Sensor And Detector Interfaces Feature Summary

• Supports temporal horn pattern or continuous tone output
• Includes alarm memory feature to indicate previous local alarm conditions
• Features interconnect capability allowing connection of up to 40 detectors
• Provides internal low battery detection and photo chamber integrity testing

Sensor And Detector Interfaces Applications

• Photoelectric smoke detectors complying with UL217 and UL268 specifications
• Multi-unit interconnected fire alarm systems
• Battery-powered residential smoke alarms requiring reduced sensitivity modes

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix 'S16TF' against official documentation to confirm packaging details such as reel quantity or tape-and-reel configuration. Confirm lead-free status and RoHS compliance through the manufacturer's latest datasheet revision. Ensure the component meets humidity sensitivity level requirements for your assembly process.

Sensor And Detector Interfaces Selection Notes

Select this model when a temporal horn pattern is required rather than continuous tone. Choose the RE46C168 variant specifically for its 1.2-minute hush timer duration compared to the 9-minute duration of the RE46C166. Ensure the application utilizes a 9V to 12V power supply range compatible with the specified operating voltage limits.

Sensor And Detector Interfaces Part Context

This component belongs to the RE46C165/6/7/8 family of low-power CMOS photoelectric smoke detector ICs. These devices are designed to provide complete functionality for smoke detection with minimal external components. The family shares common architectural features including gain-selectable photo amplifiers and internal oscillators optimized for low standby current consumption.

Sensor And Detector Interfaces Replacement Considerations

RE46C166S16TF

Sensor And Detector Interfaces FAQ

What is the difference between the RE46C168 and RE46C166 regarding alarm timing?

The RE46C168 uses a temporal horn pattern (NFPA 72) with a 1.2-minute hush timer, whereas the RE46C166 uses a continuous tone pattern with a 9-minute hush timer.

How does the interconnect feature function in this device?

The bidirectional I/O pin allows multiple detectors to be connected. When one unit alarms, it drives the line high to trigger all other connected units. A charge dump feature quickly discharges the line after a local alarm.

What is the purpose of the Alarm Memory feature?

Alarm Memory latches a signal when a local alarm occurs. After the alarm clears, the LED flashes three times every 43 seconds for 24 hours to visually identify the unit that previously alarmed.