Improved Low-Power, CMOS Analog Switches with Latches

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Maxim's redesigned DG421/DG423/DG425 monolithic analog switches now feature guaranteed on-resistance matching (3Ω max) between switches and on-resistance flatness over the signal range (4Ω max). These low on-resistance switches (20Ω typ) conduct equally well in both directions. They guarantee a low charge injection of 15pC maximum and an ESD tolerance of 2000V minimum per Method 3015.7. Off leakage current over temperature has also been reduced (less than 5nA at +85°C).

The DG421/DG423/DG425 are precision, dual CMOS switches with latchable logic inputs that simplify interfacing with microprocessors (µPs). The single-pole/single-throw DG421 and double-pole/single-throw DG425 are normally open dual switches. The dual, single-pole/double-throw DG423 has two normally open and two normally closed switches. Fast switching times (175ns for tON and 145ns for tOFF) and low power consumption (35µW max) make these parts ideal for battery-powered applications requiring µP-compatible switches. Operation is from a single +10V to +30V supply, or bipolar ±4.5V to ±20V supplies. Fabricated with the same 44V silicon-gate process, these switches have rail-to-rail signal handling capabilities.
DG421: Pin Configuration DG421: Pin Configuration Enlarge+

Key Features

New Features
  • Plug-In Upgrades for Industry-Standard DG421/DG423/DG425
  • Improved R(DS)ON Match Between Channels (3Ω max)
  • Guaranteed RFLAT(ON) Over Signal Range (4Ω max)
  • Improved Charge Injection (15pC max)
  • Improved Off Leakage Current Over Temperature (< 5nA at +85°C)
  • Withstands Electrostatic Discharge (2000V min) per Method 3015.7
Existing Features
  • Low RDS(ON)(35Ω max)
  • Single-Supply Operation +10V to +30V
  • Bipolar-Supply Operation ±4.5V to ±20V
  • Low Power Consumption (35µW max)
  • Rail-to-Rail Signal Handling Capability
  • TTL/CMOS-Logic Compatible


  • Audio-Signal Routing
  • Battery-Powered Applications
  • Communication Systems
  • Fax Machines
  • Guidance and Control Systems
  • Military Radios
  • Modems
  • Sample-and-Hold Circuits
  • Test Equipment
Request Reliability Report for: DG423 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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