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PDF A3245 Data sheet ( Hoja de datos )
| Número de pieza | A3245 | |
| Descripción | Chopper-Stabilized Omnipolar Hall-Effect Switches | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A3245
Chopper-Stabilized Omnipolar Hall-Effect Switches
Features and Benefits
▪ Omnipolar operation
▪ Chopper stabilization
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
▪ Reverse battery protection
▪ Output short circuit protection
▪ Solid state reliability
▪ Small size
▪ Robust EMC capability
▪ High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A3245 integrated circuit is an omnipolar, ultrasensitive
Hall-effect switch with a digital output. This sensor has an
integrated regulator permitting operation to 24 V, making it
the first omnipolar switch available for operation to 24 V.
This device is especially suited for operation over extended
temperature ranges, up to +150°C. Superior high-temperature
performance is made possible through an Allegro® patented
dynamic offset cancellation, which reduces the residual offset
voltage normally caused by device overmolding, temperature
excursions, and thermal stress.
TheA3245 Hall-effect switch includes the following on a single
silicon chip: voltage regulator, Hall-voltage generator, small-
signal amplifier, chopper stabilization, Schmitt trigger, and a
short circuit protected open-drain output. Advanced BiCMOS
wafer fabrication processing is used to take advantage of low-
voltage requirements, component matching, very low input-
offset errors, and small component geometries.
The omnipolar operation of the A3245 allows activation with
either a north or a south polarity field of sufficient strength. In
www.DataSheett4hU.ecomabsence of a magnetic field, the output is off. This patented
Not to scale
VCC
Continued on the next page…
Functional Block Diagram
Amp
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
A3245-DS, Rev. 2
GND
1 page  
A3245
Chopper-Stabilized Omnipolar Hall Effect Switches
Magnetic Characteristic Data
Operate Point (South) versus Ambient Temperature
55
50
45
40
35
30
25
20
15
–50
VCC (V)
24
3.6
0 50 100 150
TA (°C)
Operate Point (North) versus Ambient Temperature
-15
-20
-25
-30
-35
-40
-45
-50
-55
–50
VCC (V)
24
3.6
0 50 100 150
TA (°C)
Release Point (South) versus Ambient Temperature
50
45
40
35
30
25
20
15
10
5
–50
VCC (V)
24
3.6
0 50 100 150
TA (°C)
Release Point (North) versus Ambient Temperature
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
–50
VCC (V)
24
3.6
0 50 100 150
TA (°C)
Hysteresis versus Ambient Temperature
30
25
20 VCC (V)
24
15 3.6
10
5
–50
0 50 100
TA (°C)
150
Continued on the next page...
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A3245
Chopper-Stabilized Omnipolar Hall Effect Switches
Package LH, 3-Pin (SOT-23W)
3.00 .118
2.70 .106
0.15 [.006] M C A B
3.04 .120
2.80 .110
A
1.49 .059
3 A NOM
B
B
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC TO-236 AB, except case width and terminal tip-to-tip)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A Hall element (not to scale)
B Active Area Depth 0.28 [.011]
1
3X
0.10 [.004] C
3X
0.50
0.30
.020
.012
0.20 [.008] M C A B
0.95 .037
A
2
1.90 .075
2.10 .083
1.85 .073
0.96 .038
A NOM
SEATING C
PLANE
1.17 .046
0.75 .030
0.15 .006
0.00 .000
8º
0º
0.20 .008
0.08 .003
0.60 .024
0.25 .010
0.25 .010
SEATING PLANE
GAUGE PLANE
Package LH
3
Package UA
12
Terminal List
Name
VCC
VOUT
GND
Description
Connects power supply to chip
Output from circuit
Ground
12
3
Number
Package LH
1
Package UA
1
23
32
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3245.PDF ] | |
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