Allegro A3161LT Hall-effect switch for 2-wire application Datasheet

Data Sheet
27621.30A‡
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
X
This Hall-effect switch is a monolithic integrated circuit designed to
operate continuously over extended temperatures to +85°C. The unipolar switching characteristic makes this device ideal for use with a simple
bar or rod magnet. The A3161ELT and A3161EUA are identical except
for package.
2
3
Two package styles provide a magnetically optimized package for
most applications. Suffix ‘LT’ is a miniature SOT-89/TO-243AA
transistor package for surface-mount applications; suffix ‘UA’ is a threelead ultra-mini SIP for through-hole mounting.
OUTPUT
1
GROUND
CC
SUPPLY
V
Each device includes a voltage regulator for operation with supply
voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic
Hall-voltage generator, temperature compensation circuitry, small-signal
amplifier, Schmitt trigger, and a constant-current open-collector output.
Noise radiation is limited by control of the output current slew rate.
Dwg. PH-003-3
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC
Continuous ................................. 28 V
Surge (tw ≤ 100 ms) .................... 40 V
Reverse Battery Voltage, VRCC
Continuous ................................ -25 V
Surge (tw ≤ 100 ms) ................... -40 V
FEATURES and BENEFITS
■
■
■
■
■
■
■
■
■
Internal Current Regulator for 2-Wire Operation
Output Slew Rate Controlled
3.5 V to 25 V Operation … Needs Only An Unregulated Supply
Reverse Battery Protection
Excellent Temp. Stability
Activate with Small, Commercially Available Permanent Magnets
Small Size
Solid-State Reliability … No Moving Parts
Resistant to Physical Stress
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, VOUT .............. 28 V
Operating Temperature Range,
TA ............................. -40°C to +85°C
Storage Temperature Range,
TS ........................... -65°C to +170°C
Always order by complete part number, e.g., A3161ELT .
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges.
Limits
Characteristic
Symbol
Supply Voltage
VCC
Min.
Typ.
Max.
Units
Operating
3.5
—
25
V
3.5 V ≤ VOUT < 12 V, B < BRP
12
15
17
mA
VOUT ≥ 12 V, B < BRP
12
15
19
mA
B > BOP
—
3.5
5.0
mA
IOUT
B < BRP
—
12
—
mA
IOFF
VOUT = 24 V, B > BOP
—
<1.0
10
µA
Output Saturation Voltage
VOUT
IOUT = 5 mA, B < BRP
–
0.9
1.5
V
Output Slew Rate
di/dt
CL = 20 pF
—
7.0
20
mA/µs
tsd
CL = 20 pF
—
—
20
µs
Load Current
(2-wire application)
Test Conditions
IOUT + ICC
Output Current
Output Settling Time
MAGNETIC CHARACTERISTICS over operating supply voltage range.
Limits
At TA = +25°C
Characteristic
Over Oper. Temp. Range
Symbol
Min.
Typ.
Max.
Min.
Typ.
Max.
Units
Operate Point (output turns OFF)
BOP
–
130
160
–
130
160
G
Release Point (output turns ON)
BRP
30
110
–
30
110
–
G
Hysteresis (BOP - BRP)
Bhys
5.0
20
–
5.0
20
80
G
NOTE:Typical values are at TA = +25°C and VCC = 12 V.
FUNCTIONAL BLOCK DIAGRAM
1
VCC
3
OUTPUT
REG.
X
2
GROUND
Dwg. FH-017
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998, 1999, Allegro MicroSystems, Inc.
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
TOTAL SUPPLY CURRENT
20
TOTAL SUPPLY CURRENT (IOUT + ICC) in mA
200
SWITCH POINT in GAUSS
150
OPERATE POINT
RELEASE POINT
100
50
OVER OPER. VOLT. RANGE
-25
0
25
50
75
100
125
150
B < BRP
VCC = 3.5 V
10
5.0
VCC = 25 V
B > BOP
VCC = 3.5 V
0
-50
0
-50
VCC = 25 V
15
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in °C
AMBIENT TEMPERATURE in °C
Dwg. GH-044-1
Dwg. GH-028-4
OUTPUT SATURATION VOLTAGE
SAFE OPERATING AREA
30
SATURATION VOLTAGE in mV
1000
800
600
400
IOUT = 5 mA
200
VCC = 10 V
0
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in °C
25
20
PACKAGE SUFFIX
CODE -UA
15
PACKAGE SUFFIX
CODE -LT
10
5
0
20
40
60
80
100
120
AMBIENT TEMPERATURE in °C
Dwg. GH-029-3
www.allegromicro.com
MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS
1200
140
160
180
Dwg. GH-068
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
SENSOR LOCATIONS
OPERATION
The output of these devices (pin 3) switches OFF when the magnetic
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 switches ON. The difference in the magnetic operate and
release points is called the hysteresis (Bhys) of the device. This built-in
hysteresis allows clean switching of the output even in the presence of
external mechanical vibration and electrical noise.
Suffix “LT”
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.085"
2.16 mm
0.045"
1.14 mm
15
A
1
2
3
12
OUTPUT CURRENT in mA
BOP
Dwg. MH-008-7
Suffix “UA”
ACTIVE AREA DEPTH
0.018"
0.46 mm
NOM
0.078"
1.98 mm
9.0
6.0
TA = +25°C
3.0
BRP
0.054"
1.36 mm
A
BRANDED
SURFACE
0
0
25
50
75
100
125
150
175
200
MAGNETIC FLUX DENSITY in GAUSS
1
2
3
Dwg. GH-007-1
APPLICATIONS INFORMATION
These devices are normally operated in a 2-wire mode, where the supply
terminal and the output terminal are tied together. An external comparator
detects the change in total supply current by the addition (output off, B > BOP)
or subtraction (output on, B < BRP) of IOUT.
Hall effect applications information is available in the “Hall-Effect IC
Applications Guide”, which can be found in the latest issue of the Allegro
MicroSystems Electronic Data Book, AMS-702 or Application Note 27701,
or at
www.allegromicro.com.
Dwg. MH-011-8
Allegro
TYPICAL 2-WIRE APPLICATION
0.85 V
–
2
V
0.1 µF
+
1
3
SUPPLY
Icc + IoUT
100 Ω
CC
Dwg. EH-011A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
X
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
PACKAGE DESIGNATOR ‘LT’
Dimensions in Inches
(for reference only)
0.181
0.173
0.072
0.064
0.167
0.155
1
2
0.063
0.055
3
0.0173
0.0138
0.090
0.084
0.102
0.090
0.0189
0.0142
0.0221
0.0173
0.047
0.035
0.059
BSC
0.118
BSC
Dwg. MA-009-3A in
Dimensions in Millimeters
(controlling dimensions)
4.60
4.40
1.83
1.62
4.25
3.94
1
2
2.60
2.29
2.29
2.13
0.56
0.44
1.50
3.00
BSC
www.allegromicro.com
3
0.44
0.35
0.48
0.36
1.20
0.89
BSC
1.60
1.40
Dwg. MA-009-3A mm
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
PACKAGE DESIGNATOR ‘UA’
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
0.164
0.159
4.17
4.04
0.062
0.058
45°
1.57
1.47
45°
0.122
0.117
3.10
2.97
45°
0.085
1
2
3
45°
0.031
2.16
MAX
1
2
3
0.79
MAX
0.0173
0.0138
0.640
0.600
0.0189
0.0142
SEE NOTE
16.26
15.24
0.48
0.36
SEE NOTE
0.050
BSC
0.44
0.35
1.27
Dwg. MH-014E in
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
BSC
Dwg. MH-014E mm
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
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 appliances, 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 infringements of patents or other rights of
third parties that may result from its use.
www.allegromicro.com
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
HALL-EFFECT SENSORS
Partial Part
Number
Avail. Oper.
Characteristics at TA = +25°C
Temp.
BOP max
BRP min
Bhys typ
Features
HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys
3240
3209
3210
3361
3362
3161
3141
3235
E/L
E
E
E
E
E
E/L
S
5140
3142
3143
3144
3122
3123
3121
E
E/L
E/L
E/L
E/L
E/L
E/L
+50
±60
±60
+110
+110
+160
+160
+175
-25
+200
+230
+340
+350
+400
+440
+450
+5.0
±5.0
±5.0
+55
+55
+30
+10
+25
-175
+50
+75
+165
+50
+140
+180
+125
10
7.7
7.7
5.0*
5.0*
20
55
15*
15*
55
55
55
55
105
105
105
Notes
chopper stabilized
1
400 µW, chopper stabilized
25 µW, chopper stabilized
2-wire, chopper stabilized
2-wire, chopper stabilized, inverted output
2-wire
output 1
output 2
300 mA power driver output
2
2
1
†
HALL-EFFECT LATCHES & BIPOLAR SWITCHES in order of BOP and Bhys
3260
E/L
+30
-30
20
bipolar switch, chopper stabilized
3280
E/L
+40
-40
45
chopper stabilized
3134
E/L
+50
-50
27
bipolar switch
3133
K/L/S
+75
-75
52
bipolar switch
3281
E/L
+90
-90
100
chopper stabilized
3132
K/L/S
+95
-95
52
bipolar switch
3187
E/L
+150
-150
100*
3177
S
+150
-150
200
3625
S
+150
-150
200
900 mA power driver output
1, 3
3626
S
+150
-150
200
400 mA power driver output
1, 3
3195
E/L
+160
-160
220
active pulldown
1
3197
L
+160
-160
230
1
3175
S
+170
-170
200
3188
E/L
+180
-180
200*
3283
E/L
+180
-180
300
chopper stabilized
3189
E/L
+230
-230
100*
3275
S
+250
-250
100*
3
3185
E/L
+270
-270
340*
Operating Temperature Ranges:
S = -20°C to +85°C, E = -40°C to +85°C, J = -40°C to +115°C, K = -40°C to +125°C, L = -40°C to +150°C
Notes 1. Protected.
2. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc
motor control.
3. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control.
* Minimum. ‡ Maximum
† Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal
for reliable operation over operating temperature range.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Similar pages