AH373
Internal Pull-up Hall Effect Latch
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.0 Jan 31, 2005
1/6
Features
- Bipolar Hall effect latch sensor
- 2.2V to 20V DC operation voltage
- Built-in pull-up resistor
- 25mA output sink current
- Operating temperature:
C
125
~
C
40
+
-
- Package: SIP3, SOT23
Applications
- Rotor position sensing
- Current switch
- Encoder
- RPM detection
Pin Assignment
373
1
2 : GND
3 : OUT
2
3
373
1
2
3
1 : VCC
(Top view)
(SIP3 package)
( SOT23 package)
General Description
AH373 is a single-digital-output Hall-effect sensor
with pull-up resistor for high temperature operation.
The device includes an on-chip Hall voltage
generator for magnetic sensing, an amplifier to
amplify Hall voltage, and a comparator to provide
switching hysteresis for noise rejection, and an
output driver with a pull-up resistor (Rpu). An
internal bandgap regulator is used to provide
temperature compensated supply voltage for
internal circuits and allows a wide operating supply
range. While the magnetic flux density (B) is larger
than operate point (Bop), the OUT pin turns on
(low). If B moves toward release point (Brp), the
OUT pin is latched "on" state prior to B < Brp. When
B < Brp, the OUT pin go into " off " state.
Pin Descriptions
Name
Description
VCC
Positive Power Supply
GND
Ground
OUT
Output Pin
Ordering Information
AH373 X - X X X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP-3L
W: SOT23-3L
Package
Lead
L : Lead Free
Blank: Normal
Wafer Body
Blank or
A~Z : if necessary
to specify
AH373
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.0 Jan 31, 2005
2/6
Block Diagram
Regulator
Hall
plate
Amp
2
GND
OUT
3
2
VCC
1
Rpu
Functional Application Circuit
M
Driver
&
Control Logic
I
a
I
b
I
c
I
A
I
C
I
B
H
B
H
A
H
C
M: Three Phase Hall Motor
Digital Hall Effect Sensor
Hall Motor Driver
RPM sensing
3 Phase Hall Motor
Absolute Maximum Ratings
( at Ta= 25
C )
Characteristics
Symbol
Values
Unit
Supply voltage
VCC
20
V
Output "off " voltage
Vout (off)
28
V
Output "on" current
Io (sink)
25
mA
Operating temperature range
Top
-40~+125
C
Storage temperature range
Tstg
-65~+150
C
SIP 550
mW
Power dissipation
SOT23
PD
230 mW
AH373
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.0 Jan 31, 2005
3/6
Electrical Characteristics
( Ta= 25
C, Vcc=12V )
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply voltage
Vcc
--
2.2*
-
20
V
Output saturation voltage
Vout(sat)
Iout =20mA
-
300
400
mV
Output Leakage Current
Ioff
B < Brp
-
<0.1
10 uA
Supply current
Icc
OUT "OFF"
-
2
4
mA
Internal pull-up resistor
Rpu
--
7
10
13
K
*Note: The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the
supply is over 2.5V.
Magnetic Characteristics
(Ta=25
C, Vcc=2.5V to 20V)
(1mT=10Gauss)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
5
30
60
Gauss
Release Point
Brp
-60
-30
-5
Gauss
Hysteresis Bhys
-
60
-
Gauss
Operating Characteristics
Marking side
S
Marking side
S
( SIP3 )
( SOT23 )
N
N
Vcc
( Output
V
o
lt
age
)
Brp
Bop
0
( Magnetic flux density B )
Output
Turn off
Turn on
( off-state )
( on-state )
Vsat
Vsat
Bhy
AH373
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.0 Jan 31, 2005
4/6
Performance Characteristics (SIP3)
Ta (
C)
25
50
60
70
80
85
90
95
100
Pd
(mW)
550 440 396 352 308 286 264 242 220
Ta (
C)
105
110
115
120
125
130
135
140
150
Pd
(mW)
198 176 154 132 110 88 66 44 0
P o w e r D is s ip a tio n C u rve
0
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
0
2 5
5 0
7 5
1 0 0
1 2 5
1 5 0
T a ( C )
P d (m W )
Performance Characteristics (SOT23-3)
Ta (
C)
25
50
60
70
80
90
100
110
120
125
130 140 150
Pd (mW)
230 184 166 147
129
110
92
74
55
46
37 18 0
P o w e r D is s ip a tio n C u rv e
0
1 0 0
2 0 0
3 0 0
0
2 5
5 0
7 5
1 0 0
1 2 5
1 5 0
T a ( C )
P d (m W )
AH373
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.0 Jan 31, 2005
5/6
Marking Information
(1) SIP3
(2) SOT23
373
YWW X
Date code
Y : Year
WW : Nth week
(Top View)
ID Code:
A~Z: Non-Lead Free
a~z : Lead Free
P2:AH373
XX YM X
Date code
Y : Year
M :Month(A~L)
(Top View)
ID code
A~Z: Non-Lead Free
a~z: Lead Free
Package Information
(1) Package Type: SIP-3L
Active Area Depth
Sensor Location
1
2
3
2.00mm
1.15mm
0.51mm
NOM
BRANDED
SURFACE
Package Dimension
1.57mm
1.47mm
4.17mm
4.04mm
1.82
mm
15.50mm
13.00mm
1
2
3
1.27mm
0.41mm
0.41mm
45
45
0.38mm
0.7mm
3.10mm
2.97mm
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