AMR Sensors (Magnetic Sensors)Selection Guide

AMR sensors by supported voltages and frequencies

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Operation examples and product groups

Operation image examples

  • Select the operation for the location where you want to use an AMR sensor from the "Operation image examples" below. The "Compatible product groups" on the right of the example image for this operation are AMR sensor candidates that can be used in the operation example.
  • For product groups A to F, see the table below.
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Open/close and position detection: Strength of magnetic force lines
(The direction of the magnet remains unchanged, and the distance between the magnet and AMR sensor changes.)
Operation image examples Movement of magnet Compatible
product groups
To turn the screen on/off at notebook PC open/close operation
Distance between magnet and AMR sensor changes
A・B・C
To detect opening and closing of air valve that operates at high speed B・C
To detect whether the compartment door of a refrigerator is closed
Distance between magnet and AMR sensor changes
A・B・C
To detect the position of the lateral movement at high speed B・C
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Rotation detection: Direction of magnetic force lines
(The distance between the magnet and AMR sensor does not change, but the direction of the magnet changes.)
Operation image examples Movement of magnet Compatible
product groups
To find out whether a key position is open or closed
Direction of magnet changes
A・B・C・D・E
To detect whether the blades of a washing machine are turning at high speed B・C・D・E
To enable operation over an extended period using a single battery for an application such as a smart meter E
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Omnidirectional Detection: Detection irrespective of the direction of the magnets/magnetic field lines
(Despite varying directions and proximities of the magnets, magnets in the vicinity can be detected.)
Operation image examples Movement of magnet Compatible
product groups
To detect external, irregular, and multi-directional magnetic fields in proximity to a device
F

Product groups

Select the AMR sensor candidate based on the supply voltage, current consumption, response frequency, and other parameters of the target group.

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Product
groups
Detection
application
AMR sensor
name
Supply voltage[v] Sensitivity[mT] Average
current
consumption
[μA]*1
Response
frequency
[Hz]*1
Output logic:
Positive/Negative
Min. Typ. Max. Hoff Hon
A Position detection
(Low current
consumption)
MRMS501A-001 1.6 1.8 3.5 0.5 2.5 3 8
(min.・
reference
value)
Negative logic
MRMS511X-001 0.8 2.0
MRMS201A-001 1.6 3.0 3.5 0.5 2.5 5
MRMS205A-001 3.0 5.0 5.5 8
B Position detection
(High-speed
detection)
MRMS541E 2.4 3.0 3.8 0.9 2.7 220 1,000
(min.)
Positive logic
MRMS543E 1.6 1.8 3.6 0.5 3.1 40 500
(min.)
Positive logic
MRSS29E 3.0 12.0 30.0 0.6 2.8 1,500
(max.)
5,000
(max.)
Positive logic
C Position detection
(Ultra-low current
consumption)
MRUS74SD-001 2.0 3.0 3.6 - 2.0 0.05 (10Hz)
5 (1kHz)*3
30,000
(max.)
Positive logic
MRUS74SK-001 3.5 0.05 (10Hz)
5 (1kHz)*3
D Rotation detection MRSS29DR-001 3.5 12.0 30.0 36%*2 68%*2 1,000 -
E Rotation detection
(Ultra-low current
consumption)
MRMS791B 1.8 3.0 3.6 40%*2 60%*2 0.02 (10Hz)
2 (1kHz)*3
3,000
(max.)
F Omnidirectional detection MRMS591P 3.1 3.3 3.5 0.5 4.0 7.0 15
(min.・
reference
value)
Negative logic
MRMS581P 1.8 3.0 3.5 0.5 2.5 0.3 5
(min.・
reference
value)
  • *1:The characteristics are the values at a typical (Typ.) supply voltage (V) and at an air temperature of 25°C.
  • *2:The sensitivity standards for the MRSS29DR-001 for rotation detection applications are based on the duty cycle (ON:OFF), not the ON/OFF sensitivity.
    When the magnetic field above a certain level rotates 360° around the surface of the sensor, a stable duty cycle is obtained. However, if the magnetic force is weak or the center of rotation of the magnetic force does not match the sensor center (and in similar circumstances), the duty cycle may be unstable.
  • *3:MRUS74SD-001・MRUS74SK-001・MRMS791B can set the response frequency by inputting the pulse waveform so that the current consumption can be reduced.

Product usage examples and usage locations

Product usage examples Usage locations
Notebook PCs Display opening/closing On/Off switch, insertion of electronic pens
Introduction of display open/close detection
Smartphones Cover detection, 2-screen opening/closing
Digital video cameras Display opening/closing and reversal, On/Off switch
Digital cameras Display opening/closing, reversal, and 180° full opening, On/Off switch, strobe pop-ups
Door anti-theft devices Auto-lock motor stop position, window improper opening/closing, maintenance mode switching
Refrigerators Refrigerators opening/closing、Freezer drawer
Cylinder switches Piston end point detection
Introduction of cylinder position detection
Dishwashers Waterwheel rotation detection, door opening/closing, water leak alarm
Introduction of wheel speed detection
Microswitches and compact switches Locations with focus on waterproof structure, locations where sealing is difficult
Introduction of On/Off switch