AH372
INTERNAL PULL-UP HALL EFFECT LATCH
Description
AH372 is a single-digital-output Hall-Effect latch sensor with internal
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. An internal band-gap regulator provides a temperature
compensated supply voltage for internal circuits and allows a wide
operating supply range.
Pin Assignments
(Top View)
3. OUT
GND 2.
1. V
DD
SC59 and SOT23
NEW PRODUCT
(Front View)
When the magnetic flux density (B) perpendicular to the package is
larger than operation point (B
OP
), output is switched on (OUT pin is
pulled low). The output state is held on until a magnetic flux density
reversal falls below B
RP
. When B is less than B
RP
, the output is
switched off.
The AH372 is available in SIP-3 (Ammo Pack), SIP-3 (Bulk Pack),
SC59 and SOT23 packages.
SIP-3 (Bulk Pack)
3. OUT
2. GND
1. V
DD
Applications
Features
Bipolar Hall Effect Latch Operation
2.2V to 20V Operating Range
Single Output with Built-in Pull-up Resistor
25mA output Sink Capability
-40° to +125° Operating Temperature
C
C
Industry Standard SIP-3 (Ammo Pack), SIP-3 (Bulk Pack), SC59
and SOT23 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Rotor Position Sensing for Motor Commutation
Encoder
Speed Measurement – RPM Monitor
Contact-Less Current Switch
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green‖ products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Application Circuits
I
A
I
B
M
Digital Hall Effect Sensor
Driver
&
Control Logic
I
C
I
a
I
b
I
c
RPM sensing
M: Three Phase Hall Motor
H
A
H
B
H
C
Hall Motor Driver
3 Phase Hall Motor
AH372
Document number: DS38853 Rev. 1 - 2
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AH372
Typical Application Circuits
(cont.)
V
DD
C
IN
AH372
OUT
NEW PRODUCT
GND
Typical AH372 Circuit
Note:
4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.
Pin Descriptions
Packages: SC59, SOT23, SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack)
Pin Number
1
2
3
Pin Name
V
DD
GND
OUT
Power Supply Input
Ground
Output
Function
Functional Block Diagram
V
DD
1
Regulator
Hall
Plate
Amp
R
PU
3
OUT
2
2
GND
AH372
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AH372
Absolute Maximum Ratings
(Note 5) @T
A
= +25° unless otherwise specified.)
C,
Symbol
V
DD
V
OUT (OFF)
I
O (SINK)
B
P
D
T
STG
Supply Voltage (Note 6)
Output ―Off‖ Voltage
Output ―On‖ Current (Sink)
Magnetic Flux Density
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack)
SC59 and SOT23
550
230
-65 to +150
+150
Characteristics
Values
28
28
25
Unlimited
mW
mW
°
C
°
C
Unit
V
V
mA
NEW PRODUCT
T
J
Notes:
5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by
exposure to absolute maximum rating conditions for extended periods of time.
6. The absolute maximum V
DD
of 28V
is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate
the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
DD
T
A
Note:
Characteristic
Supply Voltage (Note 7)
Operating Temperature Range
Conditions
Operating
Operating
Rating
2.2 to 20
-40 to +125
Unit
V
°
C
7. The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics will not be normal until the supply is over 2.5V.
Electrical Characteristics
(@T
A
= +25° V
DD
= 12V, unless otherwise specified.)
C,
Symbol
V
OUT
I
DD
I
OFF
R
PU
Characteristic
Output On Voltage
Supply Current
Output Leakage Current
Internal Pull-up Resistor
B < B
RP
Output off
—
Conditions
I
OUT
= 20mA
Min
—
—
—
7
Typ
300
2
<
0.1
10
Max
400
4
10
13
Unit
mV
mA
µA
k
AH372
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AH372
Magnetic Characteristics
(Note 8) (@T
A
= +25° V
DD
= 2.5V to 20V, unless otherwise specified.)
C,
(1mT=10 Gauss)
Symbol
B
OP
(South Pole to Part Marking Side for SIP-3 (Ammo Pack),
SIP-3 (Bulk Pack) and SOT23;
North Pole to Part Marking Side for SC59 )
B
RP
(South Pole to Part Marking Side for SIP-3 (Ammo Pack),
SIP-3 (Bulk Pack) and SOT23;
North Pole to Part Marking Side for SC59 )
B
HY
(|B
OPX
|-|B
RPX
|)
Characteristic
Operation Point
Min
5
Typ
30
Max
60
Gauss
Release Point
Hysteresis
-60
—
-30
60
-5
—
Unit
NEW PRODUCT
Note:
8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Output
(Off-State)
V
DD
( Output Voltage )
B
HY
Turn off
Turn on
(On-State)
V
OUT(SAT)
B
RP
0
B
OP
( Magnetic Flux Density B )
S
S
Part Mark
S
Part Mark
Part Mark
N
N
N
SC59
SOT23
SIP-3
(Ammo Pack)
SIP-3
(Bulk Pack)
AH372
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AH372
Thermal Performance Characteristics
(1)
Package Types:
SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack)
25
550
50
440
60
396
70
352
80
308
85
286
90
264
95
242
100
220
105
198
110
176
115
154
120
132
125
110
130
88
135
66
140
44
150
0
T
A
(°
C)
P
D
(mW)
P
D
(mW)
600
Power Dissipation Curve
NEW PRODUCT
500
400
300
200
100
0
-40
0
25
50
75
100
125
150
T
A
(°
C)
(2)
Package Types: SC59 and SOT23
25
230
50
184
60
166
70
147
80
129
85
120
90
110
100
92
110
74
120
55
130
37
140
18
150
0
T
A
(°
C)
P
D
(mW)
P
D
(mW)
300
Power Dissipation Curve
200
100
0
-40
0
25
50
75
100
125
150
T
A
(°
C)
AH372
Document number: DS38853 Rev. 1 - 2
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August 2016
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