Signal Level Sensor System

Data Sheet


  • Operating Voltage (0.9 to 5.5V)
  • Low Operating Current (55µA typ.)
  • Delay circuit for long Recovery time
  • Adjustable Recovery time by external capacitor
  • Adjustable Input Sensitivity by external resistance
  • C-MOS Technology
  • Package Outline (MSOP8(TVSP8)*MEET JEDEC MO-187-DA / THIN TYPE,DFN8-U1(ESON8-U1))

General Description

The NJU7181 is a signal level sensor system IC. It sends a High flag to the microprocessor or other equipments whenever it detects the existence of the audio signal.The NJU7181 includes a delay circuit which allows the IC continue to hold the flag after the absence of the audio signal. This holding time can be adjusted with external capacitor.Together with its adjustable Input Sensitivity (by external resistor) & its characteristic of low current consumption and low operating voltage, NJU7181 is suitable for Eco-Design of Energy-using Products and for battery operated applications.


  • Power Saving for battery operated devices
  • Muting Application
  • Memory saving for recording devices
  • Half- duplex transmission application

Package Information

Part Number Package Outline PLP Pins Terminal Finish Weight(mg) (Reference) Reflow soldering Flow soldering Iron soldering Packing Condition MSL Solder Foot Print
NJU7181KU1 DFN8-U1(ESON8-U1) - 8 Sn2Bi 5.3 Yes - - Non dry pack 1
NJU7181RB1 MSOP8(TVSP8) - 8 Sn2Bi 18 Yes Yes Yes Non dry pack 1

Sample & Buy

Part Number Packages Status Packing Specification Sample Buy
NJU7181KU1 DFN8-U1(ESON8-U1) (Active) Contact Us Stock Check
NJU7181RB1 MSOP8(TVSP8) (Active) Contact Us Stock Check