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RE46C120
  • RE46C120

RE46C120

In Production

The RE46C120 is a low power CMOS ionization type smoke detector IC. With a few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10.5mS every 1.66 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. The TONE input allows for selection of a temporal pattern or continuous tone. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications....

Microchip Technology RE46C120 Product Info

16 April 2026 0

Parameters

Type

Ionization

Typical Standby Iq (uA)

4.5

UL-217 Ed 9 & UL-268 Ed 7 Compatible

False

Operating Voltage Min

6

Operating Voltage Max

12

Operating Temp Min

-10

Operating Temp Max

60

CO Monitor

True

Features

  • Guard Outputs for Ion Detector Input
  • +/-0.75pA Detect Input Current
  • Internal Reverse Battery Protection
  • Internal Low Battery Detection
  • Pin Selectable Horn Pattern
  • Low Quiescent Current Consumption (<6.5uA)
  • 16L PDIP
  • ESD Protection on all Pins
  • Compatible with MC145017, MC14467
  • Available in RoHS Compliant Pb Free Packaging

Description

The RE46C120 is a low power CMOS ionization type smoke detector IC. With a few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10.5mS every 1.66 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. The TONE input allows for selection of a temporal pattern or continuous tone. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications.

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