RE46C121

The RE46C121 is low power CMOS ionization type smoke detector IC. With 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 temporal horn pattern supports the NFPA 72 emergency evacuation signal. An interconnect pin allows multiple detectors to be connected such that when one unit alarms all units will sound. Although this device was designed for smoke detection utilizing an ionization chamber it can be used in a variety of security applications. The RE46C121 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.

Features
  • Guard Outputs for Ion Detector Input
  • +/-0.75pA Detect Input Current
  • Internal Reverse Battery Protection
  • Internal Low Battery Detection
  • Low Quiescent Current Consumption (<6.5uA)
  • Available in 16L PDIP or 16L N SOIC
  • ESD Protection on all Pins
  • Interconnect up to 40 Detectors
  • Compatible with MC145018
  • Available in Standard Packaging or RoHS Complaint Pb Free Packaging
Parameter
Parameter Name Value Value
Type Ionization Ionization
Horn Driver Alarm Pattern NFPA Temporal NFPA Temporal
Low Battery Detect True True
Reverse Battery Protection True True
Alarm Interconnect True True
Sensitivty Timer False False
Powerup Low Battery False False
Operating Temperature Range (C) -10C to 60C -10C to 60C
Documents
CMOS Ionization Smoke Detector ASIC with InterconnectData Sheets03/09/2010211KB
Analog & Interface Product Selector GuideProduct Line Card03/21/20164116KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
RE46C121E16F16PDIP-10C to +60CCTUBE0.750.620.560.550.54
Similar Devices
ProductHorn Driver Alarm PatternPrice5K
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RE46C121NFPA Temporal$0.54
RE46C122NFPA Temporal$0.57
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RE46C127Continuous Tone$0.57
RE46C129Continuous Tone$0.57
RE46C140NFPA Temporal$0.60
RE46C141NFPA Temporal$0.60
RE46C143Continuous Tone$0.60
RE46C144Continuous Tone$0.60
RE46C145NFPA Temporal$0.76
RE46C152NFPA Temporal or Continuous Tone$0.54
RE46C162NFPA Temporal or Continuous Tone$0.89
RE46C163NFPA Temporal or Continuous Tone$0.89
RE46C165NFPA Temporal$0.71
RE46C166Continuous Tone$0.71
RE46C167NFPA Temporal$0.71
RE46C168Continuous Tone$0.72
RE46C180NFPA Temporal or Continuous Tone$0.83
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RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
RE46C121E16F1.1127002.04166716PDIP.300inMatte Tine3
CMOS Ionization Smoke Detector ASIC with Interconnect RE46C121
Analog & Interface Product Selector Guide ENC624J600
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