
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Data Sheet
General Description
The AH41 is an integrated Hall-effect latched sensor
designed for electronic commutation of brushless DC
motor applications. The device includes an on-chip
Hall voltage generator for magnetic sensing, a
comparator that amplifiers the Hall voltage, and a
Schmitt to provide switching hysteresis for noise
rejection and open-collector output. An internal
bandgap regulator is used to provide temperature
compensated supply voltage for internal circuits and
allows a wide operating supply range.
A north pole of sufficient strength will turn the output
ON. In the absence of a magnetic field, the output is
OFF.
This IC is available in TO-92S-3 package.
Features
On-chip Hall Sensor
•
• Wide Operating Voltage Range: 4V to 24V
• Internal Bandgap Regulator for Temperature
Compensation
• Maximu m Output Sink Current: 50mA
• Low Profile TO-92S-3
• Operating Temperature: -40˚C to 1 50˚C
• ESD Rating: 2000V (Human Body Model)
300V (Machine Model)
Application
• Brushless DC Motor
TO-92S-3
Figure 1. Package Type of AH 41
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Pin Configuration
Z3 Package
(TO-92S-3)
Figure 2. Pin Configuration of AH41 (Front View)
Pin Description
Pin Number Pin Name Function
1 VCC Power supply pin
2 GND Ground pin
3 OUTPUT Output pin. It is low during the N magnetic field
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Functional Block Diagram
Figure 3. Functional Block Diagram of AH41
Ordering Information
AH41 -
Circuit Type
Package
Z3: TO-92S-3
G1: Green
Magnetic Characteristics
A: 30 to 75 Gauss
B: 5 to 105 Gauss
Package Temperature Range Part Number Marking ID Packing Type
TO-92S-3
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
-40 to 150°C
AH41Z3-AG1 AH41 Bulk
AH41Z3-BG1 AH41 Bulk
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Voltage VCC
Output OFF Voltage VCE 30 V
Output Sink Current (Continuous C ur rent) I
Power Dissipation (TA=25°C)
Storage Temperature T
Junction T emperature TJ 150
ESD (Machine Model) 300 V
ESD (Human Body Model) 2000 V
50 mA
OUT
400 mW
P
D
-65 to 150
STG
-24 to 28
V
°C
°C
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 (T
=25°C)
A
Parameter Symbol Min Max Unit
Supply Voltage VCC 4 24 V
Operating T emperat ure TOP -40 150
°C
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Electrical Characteristics
V
=12V, TA =25°C, unless otherwise specified.
CC
Parameter Symbol Conditions Min Typ Max Unit
Supply Voltage VCC 4 24 V
Supply Current ICC V
Output Leakage Current IOL V
Output Saturation Voltage V
I
SAT
Rise Time tr
Fall Time tf
=4V to 24V 6 9 mA
CC
=14V 0.1 10
CE
=20mA 110 300 mV
OUT
=820Ω
R
L
C
=20pF
L
=820Ω
R
L
C
=20pF
L
200
100
µA
ns
ns
Magnetic Characteristics (T
Parameter Symbol Grade Min Typ Max Unit
Operating Point
Releasing Point
Hysteresis
B
OP
B
RP
B
HYS
=25°C)
A
A
B
A
B
V
OUT
30 75
Gauss
5 105
-75 -30
Gauss
-105 -5
80 110 140 Gauss
High
Turn off
B
HYS
Turn on
V
SAT
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
B
RP
0
Magnetic Flux Density (Gauss)
B
OP
5
Low
SN

Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Test Circuit
V
S
Marking Side
CC
AH41
(Front View)
GND OUTPUTVCC
1
2 3
V
N
RL820Ω
C
L
20pF
OUT
Figure 4. Basic Test Circuit of AH41
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Typical Performance Characteristics
7
6
5
4
3
Supply Current (mA)
2
1
TA=25oC
10
8
6
4
Supply Current (mA)
2
VCC=12V
0
03691215182124
Supply Voltage(V)
Figure 5. Supply Current vs. Supply Voltage Figure 6. Supply Current vs. Ambient Temperature
0
-40 -20 0 20 40 60 80 100 120 140
Ambient Temperature (oC)
400
200
300
200
(Gauss)
100
HYS
/B
0
RP
/B
OP
B
-100
-200
-300
4 8 12 16 20 24
Supply Voltage (V)
B
OP
B
RP
B
HYS
150
100
(Gauss)
HYS
50
/B
RP
/B
OP
0
B
-50
-100
-40-200 20406080100120140
Ambient Temperature (oC)
B
OP
B
RP
B
HYS
Figure 7. BOP/BRP/B
vs. Supply Voltage Figure 8. BOP/BRP/B
HYS
vs. Ambient Temperature
HYS
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
BIPOLAR HALL-EFFECT POSITION SENSORS AH41
Typical Performance Characteristics (Continued)
200
150
100
Saturation Voltage (V)
50
0
-40-200 20406080100120140
Ambient Temperature (oC)
VCC=12V
I
=10mA
OUT
I
=20mA
OUT
Figure 9. Saturation Voltage vs. Ambient Temperature
Nov 2010 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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