KMY21M Measurement Specialties Inc/Schaevitz, KMY21M Datasheet - Page 2

• Manufacturer Part Number: KMY21M
• Description: SENSOR MAGNETIC 2.5 KA/M SOT-223
• Manufacturer: Measurement Specialties Inc/Schaevitz

Specifications of KMY21M

• Sensor Type: Angular - Magnetoresistive
• Voltage - Supply: 5V
• Operating Temperature: -40°C ~ 150°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 356-1079-2; G-MRCO-011

KMY/KMZ Linear Magnetic Field Sensors
DESCRIPTION
An uniaxial linear magnetic field (in y-direction) will generate a linear output within the specified magnetic
field range. The sensor is available in two types: the KMY 20 M, KMY 21 M and KMZ 20 M sensor types
contain intrinsic magnets which provide an auxiliary magnetic field (in x-direction) at the sensor die which
prevents magnetic domains from flipping irregularly.
If the dies MR174B or the
components KMY22, KMY20S
or
auxiliary field has to be provided
by the user. The dependence of
the sensitivity with auxiliary field
strength is depicted in the figure
aside.
Auxiliary field strengths below Hx<1.5 kA/m are not recommended, as small disturbances may flip the
magnetization domains. Sometimes, the magnetic conditions in the application may provide enough Hx bias
field stabilization. MEAS Germany can provide advise for customer specific magnet arrangements.
If a bias field Hx is not applied
or Hx is less than 2.5 kA/m, the
sensor may be used only in a
limited
depending on the present total
bias field Hx,tot. In this case, it
is strongly recommended to
‘premagnetize’ the sensor, i.e.
align
consistently,
measurement.
Hx,tot is the sum of all acting
magnetic fields in x direction at
the sensor die.
Do not use the sensor outside
the
Leaving the save operating area
can
premagnetization and therefore
will
sensor signals.
KMY/KMZ Rev 2
Figure 1: Sensitivity dependence on
KMZ20S
lead
safe
all
destroy
field
magnetic
to
operating
auxiliary field strength
are
prior
unreproducible
an
range
used,
domains
to
existing
area.
Hy,
the
the
www.meas-spec.com
15
10
5
0
0
2/8
Auxiliary Field Dependence
1
Figure 2: Safe operating area
2
Hx in kA/m
3
4
august_2010
5