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PDF A1145 Data sheet ( Hoja de datos )
| Número de pieza | A1145 | |
| Descripción | (A1145 / A1146) Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A1145 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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A1145 and A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Features and Benefits
▪ Chopper stabilization
▫ Low switchpoint drift over operating
temperature range
▫ Low sensitivity to stress
▪ Factory programmed at end-of-line for optimized
switchpoints
▪ On-chip protection
▫ Supply transient protection
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A1145 and A1146 devices are two-wire, unipolar, Hall
effect switches that are factory-programmed at end-of-line to
optimize ultrasensitive magnetic switchpoint accuracy. These
devices use a patented high frequency chopper-stabilization
technique, produced using the Allegro advanced BiCMOS
wafer fabrication process, to achieve magnetic stability and
to eliminate offset inherent in single-element devices exposed
to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized to sense seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position. Two-wire unipolar switches, such as the A1145
and A1146, are particularly advantageous in price-sensitive
applications because they require one less wire for operation
than do switches with the more traditional open-collector output.
Additionally, the system designer inherently gains diagnostics
because there is always output current flowing, which should
be in either of two narrow ranges. Any current level not within
these ranges indicates a fault condition. These devices also
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Not to scale
V+
VCC
Continued on the next page…
Functional Block Diagram
0.01 uF
Clock/Logic
Amp
Regulator
To All Subcircuits
Low-Pass
Filter
A1145-DS, Rev. 8
GND
Package UA Only
GND
1 page  
A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
*Additional thermal information available on Allegro Web site.
Value Units
228 ºC/W
110 ºC/W
165 ºC/W
Power Derating Curve
25
24 VCC(max)
23
22
21
20
19
18
17
16
15
14
13
12
11
2-layer PCB, Package LH
(RθJA = 110 ºC/W)
10
9
1-layer PCB, Package UA
8
7
6
(RθJA = 165 ºC/W)
1-layer PCB, Package LH
5 (RθJA = 228 ºC/W)
4
3
2
VCC(min)
20 40 60 80 100 120 140 160 180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
(R1θ-JlaAy=e(Rr12θP6J-AlC5ay=BºeC,1r P1/PW0aCc)ºBCk,a/PWga)eckUaAge LH
(1R-θlJaAye=r2P2C8BºC, P/Wac)kage LH
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar 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
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 A1145.PDF ] | |
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