RE46C129E16F

Sensor And Detector Interfaces Overview

The RE46C129E16F is a CMOS ionization smoke detector ASIC designed for low-power applications. It operates on a supply voltage range of 6V to 12V with typical quiescent current consumption below 6.5uA at 9V. The device features an internal oscillator that powers the detection circuitry for 10.5mS every 1.66 seconds in standby, reducing power usage. It includes interconnect capability for up to 40 detectors and supports UL217/UL268 compliance. Available in 16L PDIP or 16L N SOIC packages, it offers ESD protection and reverse battery protection.

Sensor And Detector Interfaces Feature Summary

• Guard outputs for ion detector input with +/-0.75pA detect input current
• Internal reverse battery protection and low quiescent current consumption
• Interconnect capability allowing connection of up to 40 detectors
• Compatible with Allegro A5350 and available in RoHS compliant packaging

Sensor And Detector Interfaces Applications

• Ionization type smoke detectors complying with UL217 and UL268 specifications
• Security applications requiring low power consumption
• Multi-unit alarm systems utilizing interconnect functionality

Sensor And Detector Interfaces Procurement Notes

Verify package type (PDIP-16 or SOIC-Wide-16) and RoHS compliance status when ordering. Confirm operating temperature range (-10°C to +60°C) matches application requirements. Ensure external components like OSCAP capacitor are low leakage types for accurate timing. Check for UL recognition file S24036 if certification is required.

Sensor And Detector Interfaces Selection Notes

Select based on required package style (through-hole vs surface mount). Consider external sensitivity setting via R8/R9 resistors. Verify low battery trip level adjustment needs using pin 3. Ensure supply voltage stays within 6V to 12V range. Account for interconnect line filtering if connecting non-smoke alarms.

Sensor And Detector Interfaces Part Context

Part of Microchip's RE46C series of smoke detector ASICs. Designed by R&E International, a subsidiary of Microchip Technology Inc. Recognized by Underwriters Laboratories for use in compliant smoke detectors. Utilizes CMOS technology for low power operation.

Sensor And Detector Interfaces Replacement Considerations

RE46C129E16F is functionally equivalent to RE46C129. Package suffix 'E16F' indicates PDIP-16 and RoHS compliance. No direct cross-model substitutes listed; verify pin compatibility if replacing similar ionization ASICs.

Sensor And Detector Interfaces FAQ

How does the interconnect feature work?

Pin 2 (IO) drives high when one unit alarms, causing interconnected units to sound. An internal sink device discharges the line after local alarm, and a 500mS filter prevents false triggers from pulsed signals.

What is the standby current consumption?

Typical quiescent current is less than 6.5uA at 9V supply with RBIAS=8.2MΩ and OSCAP=.1uF.

Can the low battery trip level be adjusted?

Yes, pin 3 (LBADJ) allows modification of the low battery set point by adding an external resistance to VDD or VSS during the LED pulse.