MH281
Specifications
Low Sensitivity Unipolar Hall Effect Switch
MH281 is an unipolar Hall effect sensor IC. It incorporates advanced chopper
stabilization technology to provide accurate and stable magnetic switch points. The design,
specifications and performance have been optimized for applications of solid state switches.
The output transistor will be switched on (B
OP
) in the presence of a sufficiently strong
South pole magnetic field facing the marked side of the package. Similarly, the output will be
switched off (B
RP
) in the presence of a weaker South field and remain off with “0” field.
The package type is in a
Halogen Free
version was verified by third party organization.
Halogen Free
package is available by customer’s option.
Features and Benefits
CMOS Hall IC Technology
Solid-State Reliability
Chopper stabilized amplifier stage
Unipolar, output switches with absolute value of South pole from magnet
Operation down to 3.0V
High Sensitivity for direct reed switch replacement applications
100% tested at 125℃ for K Spec.
Custom sensitivity / Temperature selection are available.
Applications
Solid state switch
Limit switch
Current limit
Interrupter
Current sensing
Magnet proximity sensor for reed switch replacement
Ordering Information
XXXXXXXXX - X
Sorting Code
Package type
Temperature Code
Part number
Company Name and Product Category
Company Name and Product Category
MH:MST Hall Effect/MP:MST Power MOSFET
Part number
181,182,183,184,185,248,249,276,477,381,381F,381R,382…..
If part # is just 3 digits, the forth digit will be omitted.
Temperature range
E: 85
℃,
I: 105
℃,
K: 125
℃,
L: 150
℃
Package type
UA:TO-92S,VK:TO-92S(4pin),VF:TO-92S(5pin),SO:SOT-23,
SQ:QFN-3,ST:TSOT-23,SN:SOT-553,SF:SOT-89(5pin)
Sorting
α,β,Blank…..
032315
Page 1 of 5
Rev. 1.02
MH281
Part No.
MH281KUA
MH281KSO
MH281EUA
MH281ESO
Temperature Suffix
K (-40℃ to + 125℃)
K (-40℃ to + 125℃)
E (-40℃ to + 85℃)
E (-40℃ to + 85℃)
Specifications
Package Type
UA (TO-92S)
SO (SOT-23)
UA (TO-92S)
SO (SOT-23)
Low Sensitivity Unipolar Hall Effect Switch
KUA spec is using in industrial and automotive application. Special Hot Testing is utilized.
Functional Diagram
V
DD
Out
Voltage
Regulator
Amp
Hall
Sensor
GND
.
Absolute Maximum Ratings
At (Ta=25
℃
)
Characteristics
Supply voltage,(V
DD
)
Output Voltage,(Vo)
Reverse Voltage , (V
DD
) (V
OUT
)
Magnetic flux density
Output current , (I
OUT
)
Operating Temperature Range, (Ta)
Values
27
27
-0.3
Unlimited
50
“E” version
“K” version
-40 to +85
-40 to +125
-55 to +150
150
(θ
ja
)
UA / SO
(
θ
jc
) UA / SO
Unit
V
V
V
Gauss
mA
℃
℃
℃
℃
℃/W
℃/W
mW
Storage temperature range, (Ts)
Maximum Junction Temp,(Tj)
Thermal Resistance
206 / 543
148 / 410
606 / 230
Package Power Dissipation, (P
D
)
UA / SO
Note:
Do not apply reverse voltage to
V
DD
and
V
OUT
Pin, It may be caused for Miss function or damaged device.
032315
Page 2 of 5
Rev. 1.02
MH281
Electrical Specifications
DC Operating Parameters
：
T
A
=+25
℃
, V
DD
=12V
Parameters
Supply Voltage,(V
DD
)
Supply Current,(I
DD
)
Output Saturation Voltage ,(V
Sat
)
Output Leakage Current, (I
off
)
Output Rise Time, (T
R
)
Output Fall Time, (T
F
)
Operate Point,(B
OP
)
Release Point,(B
RP
)
Hysteresis,(B
HYS
)
Specifications
Low Sensitivity Unipolar Hall Effect Switch
Test Conditions
Operating
B<B
OP
I
OUT
= 20 mA, B>B
OP
I
OFF
B<B
RP
, V
OUT
= 20V
R
L
=1kΩ, CL =20pF
R
L
=1kΩ; CL =20pF
Min
3.0
Typ
2.5
Max
24.0
5.0
500.0
10.0
Units
V
mA
mV
uA
uS
uS
0.04
0.18
175
95
45
250
Gauss
Gauss
Gauss
Typical application circuit
Vcc
D1
R2
V
D1：1N4148 or 100Ω
C1：1000PF
C2：15PF
R2：10KΩ
Out
C2
C1
MH281
O
G
032315
Page 3 of 5
Rev. 1.02
MH281
Specifications
Low Sensitivity Unipolar Hall Effect Switch
Sensor Location, Package Dimension and Marking
MH281 Package
UA Package
Hall Chip location
2.00
0.90
281
XXX
Hall Sensor
Location
Mark
Output Pin Assignment
(Top view)
NOTES:
1).Controlling dimension: mm
2).Leads must be free of flash
and plating voids
3).Do not bend leads within 1
mm of lead to package
interface.
4).PINOUT:
Package (SOT-23)
Pin 1
Pin 2
Pin 3
3
281
XXX
1
2
3
V
DD
GND
Out
V
DD
GND
Output
Hall Plate Chip Location
(Bottom view)
(Top View)
3
281XX
1
2
Hall Sensor
Location
0.80
2
1
1.45
NOTES:
1. PINOUT (See Top View at left :)
Pin 1
Pin 2
Pin 3
V
DD
Output
GND
2. Controlling dimension: mm
3. Lead thickness after solder plating
will be 0.254mm maximum
032315
Page 4 of 5
Rev. 1.02
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