Diodes AH922 User Manual
UNIPOLAR HALL-EFF E CT SWITCH
Data Sheet
AH922
General Description
The AH922 is a unipolar Hall-effect one-chip switch
with digital output, solution for sense magnetic field.
It is designed in mixed signal CMOS and chopper
technology. This IC is quite suitable for use in
automotive, industrial and consumer applications.
The two sensors are suited for operation over
extended temperature ranges.
The AH922 Hall-effect switch is combined with a
voltage regulator, Hall-voltage generator, chopper
small-signal amplifier, Schmitt trigger and
open-drain output.
The AH922 is available in TO-92S-3 and SOT-23-3
packages.
Features
• Wide Operating Voltage Range
• Chopper Stabilization
• Extremely Low Switch Point Drift
• Superior T emperature Stability
• High Sensitivity Integrated Hall Sensor
• Solid State Reliability
• Robust EMC Capability
Applications
• 5V/12V DC Brushless Motor/Fan
• Solid State Switch
• Speed Detection
• Revolution Counting
TO-92S-3 SOT-23-3
Figure 1. Package Types of AH922
May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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Data Sheet
UNIPOLAR HALL-EFF E CT SWITCH
AH922
Pin Configuration
Z3 Package N Package
(TO-92S-3) (SOT-23-3)
3
2
1
(Front View) (Top View)
Figure 2. Pin Configuration of AH922
3
21
Pin Description
Pin Number
TO-92S-3 SOT-23-3
1 1 VCC Supply voltage
2 3 GND Ground pin
3 2 OUT Output pin
Pin Name Function
May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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Data Sheet
UNIPOLAR HALL-EFF E CT SWITCH
AH922
Functional Block Diagram
Figure 3. Functional Block Diagram of AH922
May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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Data Sheet
UNIPOLAR HALL-EFF E CT SWITCH
AH922
Ordering Information
AH922 -
Circuit Type
Package
Z3: TO-92S-3
N: SOT-23-3
Package
TO-92S-3 AH922Z3-G1 922 Bulk
SOT-23-3
Temperature
Range
-40 to 125°C
Part Number Marking ID Packing Type
AH922NTR-G1 GT4 Tape & Reel
G1: Green
TR: Tape & Reel
Blank: Bulk
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.
May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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Data Sheet
UNIPOLAR HALL-EFF E CT SWITCH
AH922
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Voltage VCC 24 V
Output Current (Continuous) I
Power Dissipation
Operation T em perature TA -50 to 150 ºC
Storage Temperature T
Maximum Junction Temperature TJ (Max) 165 ºC
ESD (Human Body Model) ESD 4000 V
25 mA
OUT
P
D
-65 to 150 ºC
STG
TO-92S-3 400
SOT-23-3 230
mW
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
Parameter Symbol Min Max Unit
Supply Voltage V
Operating Ambient Temperature TA -40 125 ºC
CC
3.5 22 V
May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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