A1147_06 [ALLEGRO]
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches; 低电流超灵敏双线式稳定斩波型单极霍尔效应开关
| 型号： | A1147_06 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| 文件： | 总12页 (文件大小：330K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A1147 and A1148
Low Current Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Features and Benefits
Description
▪ Chopper stabilization
The A1147 and A1148 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.
▫ 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
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 A1147
and A1148, are particularly advantageous in price-sensitive
applications because they require one less wire for operation
thandoswitcheswiththemoretraditionalopen-collectoroutput.
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
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Continued on the next page…
Not to scale
Functional Block Diagram
V+
VCC
Regulator
To All Subcircuits
Clock/Logic
Amp
0.01 uF
Low-Pass
Filter
GND
GND
Package UA Only
A1147-DS, Rev. 8
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Description (continued)
feature on-chip transient protection and a Zener clamp to protect
against overvoltage conditions on the supply line.
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-
23W,miniaturelow-profilepackageforsurface-mountapplications.
The UA is a three-lead ultramini SIP for through-hole mounting.
Each package is available in a lead (Pb) free version (suffix, –T)
with100%mattetinplatedleadframe. Field-programmableversions
also available: A1180 and A1181.
The output currents of the A1148 switches HIGH in the presence
of a south (+) polarity magnetic field of sufficient strength, and
switches LOW otherwise, as in the presence of a weak field or a
north (–) polarity field. The A1147 has an opposite output: the
currents switch LOW in the presence of a south-polarity magnetic
Selection Guide
Operating Ambient
Temperature, TA
(°C)
Output Level in
South (+) Field3
Part Number
A1147ELHLT-T
Pb-Free1
Packing2
Package
Yes
Yes
–
Tape and Reel, 3000 pieces/reel
Bulk Bag, 500 pieces/bag
Surface Mount
A1147EUA-T
A1147EUATI
A1147EUATI-T
A1147LLHLT-T
A1147LUA-T
A1147LUATI
A1147LUATI-T
A1148ELHLT-T
A1148EUA-T
A1148EUATI
A1148EUATI-T
A1148LLHLT-T
A1148LUA-T
A1148LUATI
A1148LUATI-T
–40 to 85
–40 to 150
–40 to 85
–40 to 150
Through Hole
Surface Mount
Through Hole
Surface Mount
Through Hole
Surface Mount
Through Hole
Tape and Reel, 2000 pieces/reel
Yes
Yes
Yes
–
Low
Tape and Reel, 3000 pieces/reel
Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Yes
Yes
–
Tape and Reel, 3000 pieces/reel
Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Yes
Yes
–
High
Tape and Reel, 3000 pieces/reel
Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
1Pb-based variants are being phased out of the product line.
a. Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of
this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obso-
lescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadlilne for receipt of LAST TIME BUY
ORDERS: April 27, 2007. These variants include: A1147ELHLT, A1147EUA, A1147LLHLT, A1147LUA, A1148ELHLT, A1148EUA, and, A1148LLHLT.
b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that
sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because
obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1148LUA.
2Contact Allegro for additional packing options.
3South (+) magnetic fields must be of sufficient strength.
Absolute Maximum Ratings
Characteristic
Symbol
VCC
Notes
Rating
28
Units
V
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
VRCC
B
–18
V
Unlimited
–40 to 85
–40 to 150
165
G
Range E
Range L
ºC
ºC
ºC
ºC
Operating Ambient Temperature
TA
Maximum Junction Temperature
Storage Temperature
TJ(max)
Tstg
–65 to 170
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Supply Voltage1
Symbol
VCC
Test Conditions
Min.
3.5
2
Typ.
Max.
24
Units
V
–
–
–
ICCL
B > BOP for A1147; B < BRP for A1148
B > BOP for A1148; B < BRP for A1147
VRCC = –18 V
5
mA
mA
Supply Current2
ICCH
12
17
Reverse Supply Current
IRCC
–
28
–
–
–
–
–1.6
40
8
mA
V
Supply Zener Clamp Voltage
Supply Zener Clamp Current3
VZSUPPLY ICC = ICCL(max) + 3 mA; TA = 25°C
IZSUPPLY VZSUPPLY = 28 V
mA
Capacitance of the oscilloscope performing
the measurement = 20 pF
Output Slew Rate4
di/dt
–
36
–
mA/μs
Chopping Frequency
Power-On Time5
fC
–
–
–
200
–
–
25
–
kHz
ꢀs
–
CBYPASS = 0.01 μF
ton
Power-On State6,7
POS
t < ton; VCC slew rate > 25 mV/ꢀs
HIGH
1VCC represents the generated voltage between the VCC pin and the GND pin.
2Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
3IZSUPPLY(max) = ICCL(max) + 3 mA.
4Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.
6POS is defined as true only with a VCC slew rate of 25 mV/μs or greater. Operation with a VCC slew rate less than 25 mV/μs can permanently harm
device performance.
7POS is undefined for t > ton or BRP < B < BOP
.
MAGNETIC CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
A1147 ICC = ICCL
A1148 CC = ICCH
A1147 ICC = ICCH
A1148 CC = ICCL
BHYS = BOP – BRP
Min.
Typ.*
Max.
Units
Operate Point
BOP
20
37
80
G
I
Release Point
Hysteresis
BRP
10
5
22
15
60
30
G
G
I
BHYS
*Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as TA = 25°C and VCC = 12 V.
Performance may vary for individual units, within the specified maximum and minimum limits.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Characteristic Data
Supply Current (Low) versus Ambient Temperature
Supply Current (High) versus Ambient Temperature
at Various Levels of VCC
at Various Levels of VCC
(A1147 and A1148)
(A1147 and A1148)
20
10
8
18
VCC
3.5 V
VCC
3.5 V
16
14
6
4
12.0 V
24.0 V
12.0 V
24.0 V
12
10
2
0
–50
0
50
100
150
200
–50
0
50
100
150
200
Ambient Temperature, TA (°C)
Ambient Temperature, TA (°C)
Operate Point versus Ambient Temperature
at Various Levels of VCC
Switchpoint Hysteresis versus Ambient Temperature
at Various Levels of VCC
(A1147 and A1148)
(A1147 and A1148)
70
40
35
30
60
50
40
30
20
10
0
VCC
VCC
25
20
15
10
5
3.5 V
12.0 V
24.0 V
3.5 V
12.0 V
24.0 V
0
–50
0
50
100
150
200
–50
0
50
100
150
200
Ambient Temperature, TA (°C)
Ambient Temperature, TA (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Units
Package LH, 1-layer PCB with copper limited to solder pads
228 ºC/W
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias
RθJA
Package Thermal Resistance
110
ºC/W
Package UA, 1-layer PCB with copper limited to solder pads
165 ºC/W
*Additional thermal information available on Allegro Web site.
Power Derating Curve
25
24
23
V
CC(max)
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
2-layer PCB, Package LH
(RθJA = 110 ºC/W)
1-layer PCB, Package UA
(RθJA = 165 ºC/W)
1-layer PCB, Package LH
(RθJA = 228 ºC/W)
4
V
CC(min)
3
2
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
40
60
80
100
120
140
160
180
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
5
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Functional Description
Operation
The output, ICC, of the A1147 device switches low after the mag-
netic field at the Hall sensor exceeds the operate point threshold,
BOP. When the magnetic field is reduced to below the release
point threshold, BRP, the device output goes high. The differ-
ences between the magnetic operate and release point is called
the hysteresis of the device, BHYS. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise. The A1148 device
switches with opposite polarity for similar BOP and BRP values,
in comparison to the A1147 (see figure 1).
I+
I+
ICC(H)
ICC(H)
ICC(L)
ICC(L)
0
0
B+
B–
B+
B–
BHYS
BHYS
(A) A1147
(B) A1148
Figure 1. Alternative switching behaviors are available in the A114x device family. On the horizontal axis, the B+ direction indicates
increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the
case of increasing north polarity).
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Chopper Stabilization Technique
The chopper stabilization technique uses a 200 kHz high
frequency clock. For demodulation process, a sample and hold
technique is used, where the sampling is performed at twice the
chopper frequency (400 kHz). This high-frequency operation
allows a greater sampling rate, which results in higher accuracy
and faster signal-processing capability. This approach desensi-
tizes the chip to the effects of thermal and mechanical stresses,
and produces devices that have extremely stable quiescent Hall
output voltages and precise recoverability after temperature
cycling. This technique is made possible through the use of a
BiCMOS process, which allows the use of low-offset, low-noise
amplifiers in combination with high-density logic integration
and sample-and-hold circuits.
When using Hall-effect technology, a limiting factor for
switchpoint accuracy is the small signal voltage developed
across the Hall element. This voltage is disproportionally small
relative to the offset that can be produced at the output of the
Hall sensor. This makes it difficult to process the signal while
maintaining an accurate, reliable output over the specified oper-
ating temperature and voltage ranges.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The patented Allegro technique, namely
Dynamic Quadrature Offset Cancellation, removes key sources
of the output drift induced by thermal and mechanical stresses.
This offset reduction technique is based on a signal modulation-
demodulation process. The undesired offset signal is separated
from the magnetic field-induced signal in the frequency domain,
through modulation. The subsequent demodulation acts as a
modulation process for the offset, causing the magnetic field-
induced signal to recover its original spectrum at baseband, while
the dc offset becomes a high-frequency signal. The magnetic-
sourced signal then can pass through a low-pass filter, while the
modulated dc offset is suppressed. This configuration is illus-
trated in figure 2.
The repeatability of magnetic field-induced switching is affected
slightly by a chopper technique. However, the Allegro high-
frequency chopping approach minimizes the affect of jitter and
makes it imperceptible in most applications. Applications that
are more likely to be sensitive to such degradation are those
requiring precise sensing of alternating magnetic fields; for
example, speed sensing of ring-magnet targets. For such applica-
tions, Allegro recommends its digital sensor families with lower
sensitivity to jitter. For more information on those devices,
contact your Allegro sales representative.
Regulator
Clock/Logic
Low-Pass
Filter
Hall Element
Amp
Figure 2. Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Application Information
Typical Application Circuit
The A114x family of devices must be protected by an external
bypass capacitor, CBYP, connected between the supply, VCC,
and the ground, GND, of the device. CBYP reduces both external
noise and the noise generated by the chopper-stabilization func-
tion. As shown in figure 3, a 0.01 μF capacitor is typical.
V+
VCC
B
A114x
C
BYP
Installation of CBYP must ensure that the traces that connect it to
the A114x pins are no greater than 5 mm in length.
0.01 μF
GND
GND
B
All high-frequency interferences conducted along the supply
lines are passed directly to the load through CBYP, and it serves
only to protect the A114x internal circuitry. As a result, the load
ECU (electronic control unit) must have sufficient protection,
other than CBYP, installed in parallel with the A114x.
A
A
B
Package UA Only
Maximum separation 5 mm
RSENSE
A series resistor on the supply side, RS (not shown), in combina-
tion with CBYP, creates a filter for EMI pulses.
When determining the minimum VCC requirement of the A114x
device, the voltage drops across RS and the ECU sense resistor,
RSENSE, must be taken into consideration. The typical value for
RSENSE is approximately 100 Ω.
ECU
Figure 3. Typical application circuit
For additional general application information, visit the Allegro
Web site at www. allegromicro.com.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
8
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Power Derating
Example: Reliability for VCC at TA=150°C, package UA, using
minimum-K PCB.
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
Observe the worst-case ratings for the device, specifically:
RθJA=165°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 17 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷RθJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 91mW÷17mA=5 V
The result indicates that, at TA, the application and device can
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
dissipate adequate amounts of heat at voltages ≤VCC(est)
.
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
PD = VIN
I
(1)
×
IN
ΔT = PD
R
(2)
θJA
×
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then:
PD = VCC
I
= 12 V 4 mA = 48 mW
×
×
CC
ΔT = PD
R
= 48 mW 140 °C/W = 7°C
×
×
θJA
TJ = TA + ΔT = 25°C + 7°C = 32°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max)
at a selected RθJA and TA.
,
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
9
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Device Qualification Program
Contact Allegro for information.
EMC (Electromagnetic Compatibility) Requirements
Contact your local representative for EMC results.
Test Name
ESD – Human Body Model
ESD – Machine Model
Conducted Transients
Direct RF Injection
Bulk Current Injection
TEM Cell
Reference Specification
AEC-Q100-002
AEC-Q100-003
ISO 7637-2
ISO 11452-7
ISO 11452-4
ISO 11452-3
Pin-out Drawings
Package LH, 3-pin SOT
Package UA, 3-pin SIP
3
NC
2
1. VCC
1. VCC
2. GND
3. GND
1
2. No connection
3. GND
1
2
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
10
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current 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
NOM
8º
0º
B
B
A
3
0.20 .008
0.08 .003
2.10 .083
1.85 .073
A
0.96 .038
A NOM
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
0.60 .024
0.25 .010
1
2
A
B
Hall element (not to scale)
0.25 .010
Active Area Depth 0.28 [.011]
C
3X
SEATING PLANE
GAUGE PLANE
SEATING
PLANE
0.10 [.004]
C
0.50 .020
0.30 .012
3X
1.17 .046
0.75 .030
0.20 [.008] M
C A B
0.15 .006
0.00 .000
0.95 .037
1.90 .075
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
11
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1147 and
A1148
Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
Package UA, 3-Pin SIP
.164 4.17
.159 4.04
C
D
.0805 2.04
NOM
.062 1.57
.058 1.47
D
1.44
.0565
NOM
.122 3.10
.117 2.97
B
.085 2.16
MAX
.031 0.79
REF
A
.640 16.26
.600 15.24
.017 0.44
.014 0.35
1
2
3
.019 0.48
.014 0.36
.050 1.27
NOM
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A
Dambar removal protrusion (6X)
Ejector mark on opposite side
B
C
D
Active Area Depth .0195 [0.50] NOM
Hall element (not to scale)
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2004, 2006 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
12
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
相关型号：
A1148ELHLT
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
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ALLEGRO
A1148LUA
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
ALLEGRO
A1148LUA-T
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
ALLEGRO
A1148LUATI
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
ALLEGRO
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