Diodes AH920 User Manual
AH920
Document number: DS36768 Rev. 2 - 2
1 of 13
www.diodes.com
December 2013
© Diodes Incorporated
AH920
A Product Line of
Diodes Incorporated
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, Hallvoltage 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.
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)
Pin Assignments
(Front View)
1
2
3
OUT
GND
VCC
TO-92S-3 (Z3 Package)
(Top View)
3
21
OUT
GND
VCC
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
AH920
VCC GND OUT
C
L
0.1mF
R
L
Output
V
CC1
V
CC2
AH920
GND
OUT
VCC
Output
R
L
C
L
0.1mF
V
CC
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
Typical Applications Circuit
AH920
Document number: DS36768 Rev. 2 - 2
2 of 13
www.diodes.com
December 2013
© Diodes Incorporated
AH920
A Product Line of
Diodes Incorporated
Pin Number
Pin Name
Function
TO-92S-3
SOT-23-3
1
1
VCC
Supply voltage 2 3
GND
Ground pin 3 2
OUT
Output Pin
Hall Sense
Chopper
Switch
Reference Voltage
AMP
VCC
1 (1)
OUT
3 (2)
2 (3)
GND
A (B)
A for TO-92S-3
B for SOT-23-3
Pin Descriptions
Functional Block Diagram
AH920
Document number: DS36768 Rev. 2 - 2
3 of 13
www.diodes.com
December 2013
© Diodes Incorporated
AH920
A Product Line of
Diodes Incorporated
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
20
V
ICC
Supply Current (Fault)
5
mA
I
OUT
Output Current (Continuous)
25
mA
PD
Power Dissipation
TO-92S-3
400
mW
SOT-23-3
230
TA
Operation Temperature
-50 to +150
ºC
T
STG
Storage Temperature
-65 to +150
ºC
TJ (Max)
Maximum Junction Temperature
+165
ºC
ESD
ESD (Human Body Model)
6000
V
Symbol
Parameter
Min
Max
Unit
V
CC
Supply Voltage
3.5
20 V TA
Operating Ambient Temperature
-40
+125
ºC
Absolute Maximum Ratings (Note 1)
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 Ope rating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
AH920
Document number: DS36768 Rev. 2 - 2
4 of 13
www.diodes.com
December 2013
© Diodes Incorporated
AH920
A Product Line of
Diodes Incorporated
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VCC
Supply Voltage
Operating
3.5
12
20
V
ICC
Supply Current
VCC=12V, B<BRP
3.0
5.0
mA
VCC=12V, B>BOP
3.0
5.0
mA
V
SAT
Saturation Voltage
I
OUT
=20mA, B>BOP
185
500
mV
I
LEAKAGE
Output Leakage Current
V
OUT
=20V, B<BRP
0.1
10
μA
t
RISING
Output Rising Time
RL=1kΩ,CL=20pF
0.4 2 μs
t
FALLING
Output Falling Time
RL=1kΩ,CL=20pF
0.4 2 μs
Symbol
Parameter
Min
Typ
Max
Unit
BOP
Operating Point
5
22
40
Gauss
BRP
Releasing Point
-40
-22
-5
Gauss
B
HYS
Hysteresis 45
Gauss
V
OUT
V
CC
V
d
High
Low
B
HYS
B
RP
B
OP
V
SAT
0N S
For TO-92S-3
V
OUT
V
CC
V
d
High
Low
B
HYS
B
RP
B
OP
V
SAT
0N S
For SOT-23-3
Electrical Characteristics (@V
Magnetic Characteristics (@V
=12V, TA =+25°C, unless otherwise specified.)
CC
=12V, TA=+25°C, unless otherwise specified.)
CC
Figure 1. Magnetic Flux Density of AH920
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