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TMR sensor IC as reed switch replacement:
ABLIC S-5701 B-series requires only 160 nA current

TMR-Sensor-IC from ABLIC

Robust replacement for reed switches:

This is what ABLIC Inc. offers with its surface-mountable TMR sensor IC (Tunnel Magneto Resistance) S-5701 B-series. This magnetic sensor IC offers a very low operating current of only 160 nA combined with high magnetic sensitivity and a long service life.

We have compared the limitations of the reed switch with the advantages of the TMR sensor IC:

Reed switch limitations TMR Sensor IC Benefits
Mechanical contacts in glass housing very susceptible to vibrations and shocks, easily breakable IC in moulded plastic housing very robust and much more resistant to vibrations and shocks
More soldering effort when assembling on printed circuit boards Fewer soldering processes required as it can be soldered together with other components
Minimum size of sensor magnets required for function Approximately 1/10 the size of a normal reed switch
Current flow with sensor switched on significantly reduces battery life
Minimum size of sensor magnets required for function
State-independent power consumption in the nano-ampere range significantly extends battery life

Advantages over other MR sensor ICs
Unlike other MR sensor ICs such as anisotropic magnetoresistive (AMR) or giant magnetoresistive (GMR) sensor ICs, the TMR sensor IC S-5701 B-series features high sensitivity and extremely low power consumption.

The main technical features of the S-5701 B-series at a glance:

  • Average operating current at 3.3 V supply voltage: 160 nA.
    This corresponds to about 1/6 of the current consumption of a regular AMR sensor IC.
  • Operating voltage range: 1.7 to 5.5 V
  • Operating temperature range: -40 to 125 °C
  • Very flat TSOT-23-3S package
  • Products with high magnetic sensitivity (BOP = 1.0 mT ) available

Areas of application
Typical applications for the S-5701 B-series are e.g. window opening/closing sensors, electronic keys, smoke detectors, gas meters, water meters and intelligent meters.

We will be happy to provide you with release samples for your development after testing. For further information, please contact us:

S-5701 B Series

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