A Product Line of
Diodes Incorporated
AH920
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
Description
The AH920 is a Hall-effect latch designed in mixed signal CMOS
technology. It is quite suitable for use in automotive, industrial and
consumer applications.
Superior high-temperature performance is made possible through
dynamic offset cancellation, which reduces the residual offset voltage
normally caused by device over-molding, temperature dependencies,
and thermal stress. The device integrates a voltage regulator, Hall-
voltage generator, small-signal amplifier, chopper stabilization, schmitt
trigger, and open-drain output.
An on-board regulator permits operation with supply voltage from
3.5V to 20V.
The AH920 is available in TO-92S-3 and SOT-23-3 packages, which
are optimized for most applications.
Pin Assignments
(Front View)
3
2
1
OUT
GND
VCC
TO-92S-3 (Z3 Package)
(Top View)
GND
3
1
2
VCC
OUT
Features
Wide Operating Voltage Range from 3.5V to 20V
Symmetrical Switch Points
Chopper-stabilized Amplifier Stage
Superior Temperature Stability
Open-drain Output
Compact Size
ESD Rating: 6000V (Human Body Model)
SOT-23-3 (N Package)
Applications
Brushless DC Motor Commutation
Brushless DC Fan
Solid-state Switch
Revolution Counting
Speed Detection
High Sensitivity and Unconnected Switch
Typical Applications Circuit
V
CC1
R
L
OUT
Output
AH920
GND
OUT
Output
AH920
R
L
VCC
GND
V
CC
C
L
0.1mF
VCC
V
CC2
C
L
0.1mF
AH920
Document number: DS36768 Rev. 2 - 2
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A Product Line of
Diodes Incorporated
AH920
Absolute Maximum Ratings
(Note 1)
Symbol
V
CC
I
CC
I
OUT
Supply Voltage
Supply Current (Fault)
Output Current (Continuous)
TO-92S-3
P
D
Power Dissipation
SOT-23-3
T
A
T
STG
T
J
(Max)
ESD
Operation Temperature
Storage Temperature
Maximum Junction Temperature
ESD (Human Body Model)
-50 to +150
-65 to +150
+165
6000
230
º
C
º
C
º
C
V
Parameter
Value
20
5
25
400
mW
Unit
V
mA
mA
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
CC
T
A
Supply Voltage
Parameter
Min
3.5
-40
Max
20
+125
Unit
V
º
C
Operating Ambient Temperature
AH920
Document number: DS36768 Rev. 2 - 2
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© Diodes Incorporated
A Product Line of
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AH920
Electrical Characteristics
Symbol
V
CC
(@V
CC
=12V, T
A
=+25° unless otherwise specified.)
C,
Parameter
Supply Voltage
Conditions
Operating
V
CC
=12V, B<B
RP
Min
3.5
Typ
12
3.0
3.0
185
0.1
0.4
0.4
Max
20
5.0
5.0
500
10
2
2
Unit
V
mA
mA
mV
μA
μs
μs
I
CC
Supply Current
V
CC
=12V, B>B
OP
V
SAT
I
LEAKAGE
t
RISING
t
FALLING
Saturation Voltage
Output Leakage Current
Output Rising Time
Output Falling Time
I
OUT
=20mA, B>B
OP
V
OUT
=20V, B<B
RP
R
L
=1kΩ,C
L
=20pF
R
L
=1kΩ,C
L
=20pF
Magnetic Characteristics
(@V
CC
=12V, T
A
=+25° unless otherwise specified.)
C,
Symbol
B
OP
B
RP
B
HYS
Operating Point
Releasing Point
Hysteresis
Parameter
Min
5
-40
Typ
22
-22
45
Max
40
-5
Unit
Gauss
Gauss
Gauss
V
OUT
V
OUT
V
CC
V
d
High
B
HYS
V
d
V
CC
High
B
HYS
Low
V
SAT
N
B
RP
0
B
OP
S
Low
B
RP
N
0
B
OP
S
V
SAT
For TO-92S-3
For SOT-23-3
Figure 1. Magnetic Flux Density of AH920
AH920
Document number: DS36768 Rev. 2 - 2
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© Diodes Incorporated
A Product Line of
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AH920
Magnetic Characteristics
(Cont.)
South Pole
North Pole
Output=Low (For TO-92S-3)
Output=High (For TO-92S-3)
South Pole
North Pole
Output=High (For SOT-23-3)
Output=Low (For SOT-23-3)
Figure 2. Output Status vs. Magnetic Pole
Package Type
TO-92S-3
Parameter
South Pole
North Pole
South Pole
Test Condition
B＞B
OP
B＜B
RP
B＞B
OP
B＜B
RP
Output
Low
High
High
Low
SOT-23-3
North Pole
Table 1. Output Status vs. Magnetic Pole
AH920
Document number: DS36768 Rev. 2 - 2
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© Diodes Incorporated
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