Allegro A3280ELT Hall-effect latches for high-temperature operation Datasheet

Data Sheet
27609.2A
3185 THRU
3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE OPERATION
X
These Hall-effect latches are extremely temperature-stable and stressresistant sensors especially suited for operation over extended temperature
ranges to +150°C. Superior high-temperature performance is made possible
through a novel Schmitt trigger circuit that maintains operate and release
point symmetry by compensating for temperature changes in the Hall element. Additionally, internal compensation provides magnetic switch points
that become more sensitive with temperature, hence offsetting the usual
degradation of the magnetic field with temperature. The symmetry capability
makes these devices ideal for use in pulse-counting applications where duty
cycle is an important parameter. The four basic devices (3185, 3187, 3188,
and 3189) are identical except for magnetic switch points.
CC
2
3
OUTPUT
SUPPLY
1
GROUND
V
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ............................ 30 V
Reverse Battery Voltage, VRCC ........... -30 V
Magnetic Flux Density, B ........... Unlimited
Output OFF Voltage, VOUT .................. 30 V
Reverse Output Voltage, VOUT .......... -0.5 V
Continuous Output Current, IOUT ..... 25 mA
Operating Temperature Range, TA
Suffix ‘E–’ ................... -40°C to +85°C
Suffix ‘L–’ ................. -40°C to +150°C
Storage Temperature Range,
TS ............................... -65°C to +170°C
Each device includes on a single silicon chip a voltage regulator, quadratic Hall-voltage generator, temperature compensation circuit, signal
amplifier, Schmitt trigger, and a buffered open-collector output to sink up to
25 mA. The on-board regulator permits operation with supply voltages of 3.8
to 24 volts.
The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix
‘L–’ is for -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications; suffix ‘–U’
is a three-lead plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-miniSIP.
FEATURES
■
■
■
■
■
■
■
■
■
Symmetrical Switch Points
Superior Temperature Stability
Operation From Unregulated Supply
Open-Collector 25 mA Output
Reverse Battery Protection
Activate With Small, Commercially Available Permanent Magnets
Solid-State Reliability
Small Size
Resistant to Physical Stress
Always order by complete part number: the prefix ‘A’ + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3185ELT .
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
VCC
REG.
X
3
OUTPUT
2
GROUND
Dwg. FH-005-3
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits
Characteristic
Symbol
Supply Voltage
VCC
Min.
Typ.
Max.
Units
Operating
3.8
—
24
V
VOUT(SAT)
IOUT = 20 mA, B > BOP
—
175
400
mV
Output Leakage Current
IOFF
VOUT = 24 V, B < BRP
—
0.05
5.0
µA
Supply Current
ICC
B < BRP (Output OFF)
—
4.75
8.0
mA
B > BOP (Output ON)
—
5.7
—
mA
Output Saturation Voltage
Test Conditions
Output Rise Time
tr
RL = 820 Ω, CL = 20 pF
—
100
—
ns
Output Fall Time
tf
RL = 820 Ω, CL = 20 pF
—
100
—
ns
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers*
A3185
A3187
A3188
A3189
Characteristic
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
BOP at TA = 25°C
170
270
50
150
100
180
50
230
140
300
50
175
80
200
50
250
-270
-170
-150
-50
-180
-100
-230
-50
-300
-140
-175
-50
-200
-80
-250
-50
340
540
100
300
200
360
100
460
280
600
100
350
160
400
100
500
over operating temp. range
BRP at TA = 25°C
over operating temp. range
Bhys at TA = 25°C
over operating temp. range
NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP).
As used here, negative flux densities are defined as less than zero (algebraic convention).
*Complete part number includes a suffix to identify operating temperature range (E or L) and package type ( LT, U, or UA).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1995, 1999, Allegro MicroSystems, Inc.
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
TYPICAL OPERATING CHARACTERISTICS
A3185* SWITCH POINTS
A3187* SWITCH POINTS
150
300
200
100
OPERATE POINT
SWITCH POINT IN GAUSS
SWITCH POINT IN GAUSS
OPERATE POINT
100
V CC = 12 V
0
-100
50
V CC = 12 V
0
-50
RELEASE POINT
RELEASE POINT
-100
-200
-150
-50
-300
-50
0
-25
50
25
100
75
150
125
AMBIENT TEMPERATURE IN °C
-25
0
25
75
50
7.0
I OUT = 20 mA
VCC = 12 V
SUPPLY CURRENT IN mA
V CC = 4.5–24 V
200
100
6.0
B ≥ B OP
5.0
B ≤ B RP
0
-50
-25
0
25
50
100
75
125
4.0
-50
150
-25
0
AMBIENT TEMPERATURE IN °C
25
50
125
100
75
AMBIENT TEMPERATURE IN °C
150
Dwg. GH-028
Dwg. GH-029
OPERATE POINT
SUPPLY CURRENT
10
CHANGE IN OPERATE POINT IN GAUSS
20
8.0
SUPPLY CURRENT IN mA
150
Dwg. GH-027
SUPPLY CURRENT
OUTPUT SATURATION VOLTAGE
300
SATURATION VOLTAGE IN mV
125
100
AMBIENT TEMPERATURE IN °C
Dwg. GH-026
B ≥ B OP
6.0
B ≤ B RP
4.0
T A = +25°C
2.0
0
15
T A = +25°C
10
5.0
0
-5.0
0
5
10
15
SUPPLY VOLTAGE IN VOLTS
20
25
Dwg. GH-030
0
5
10
15
SUPPLY VOLTAGE IN VOLTS
20
25
Dwg. GH-037
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT, U, or UA).
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
SENSOR LOCATIONS
(±0.005” [0.13 mm] die placement)
Package Designators “LT”
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.090"
2.27 mm
0.050"
1.27 mm
2
In operation, the output transistor is OFF until the strength of the magnetic field perpendicular to the surface of the chip exceeds the threshold or
operate point (BOP). When the field strength exceeds BOP, the output transistor switches ON and is capable of sinking 25 mA of current.
The output transistor switches OFF when magnetic field reversal results
in a magnetic flux density below the OFF threshold (BRP). This is illustrated
in the transfer characteristics graph (A3187* shown).
Note that the device latches; that is, a south pole of sufficient strength
will turn the device ON. Removal of the south pole will leave the device ON.
The presence of a north pole of sufficient strength is required to turn the
device OFF.
A
1
OPERATION
3
Dwg. MH-008-4B
Package Designator “U”
0.092"
2.33 mm
0.077"
1.96 mm
OUTPUT VOLTAGE IN VOLTS
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
30 V
MAX
VBB
B RP
B OP
A
BRANDED
SURFACE
VOUT(SAT)
1
2
0
3
-B
0
FLUX DENSITY
+B
Dwg. GH-034-4
Dwg. MH-002-7B
Package Designators “UA” and "UA-TL"
ACTIVE AREA DEPTH
0.018"
0.46 mm
NOM
The simplest form of magnet that will operate these devices is a ring
magnet, as shown below. Other methods of operation are possible.
0.083"
2.10 mm
0.060"
1.51 mm
A
BRANDED
SURFACE
1
2
3
Dwg. A-11,899
Dwg. MH-011-4B
Although sensor location is accurate to three
sigma for a particular design, product improvements may result in small changes to sensor
location.
APPLICATIONS INFORMATION
Extensive applications information on magnets and Hall-effect sensors is
also available in the Allegro Integrated and Discrete Semiconductors Data
Book or Application Note 27701.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘U’
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
0.183
0.178
4.65
4.52
0.063
0.059
1.60
1.50
0.181
0.176
4.60
4.47
45°
0.086
1
2
45°
0.018
3
2.18
MAX
1
2
0.46
3
MAX
0.600
0.560
0.015
15.24
14.23
0.38
0.016
0.41
SEE NOTE
SEE NOTE
0.050
0.100
1.27
2.54
Dwg. MH-003D in
Dwg. MH-003D mm
Devices in the ‘U’ package are
NOT RECOMMENDED FOR NEW DESIGN
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.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
6. Minimum lead length was 0.500" (12.70 mm). If existing product to the original specifications is not acceptable,
contact sales office before ordering.
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
(for reference only)
Dimensions in Inches
(controlling dimensions)
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
0.640
0.600
16.26
15.24
0.015
SEE NOTE
0.38
SEE NOTE
0.016
0.41
0.050
BSC
1.27
BSC
Dwg. MH-014D in
Dwg. MH-014D mm
Surface-Mount Lead Form (Suffix ‘-TL’)
2.41
0.095
±0.13
±0.005
0.002
0.051
MAX
MAX
0.004 0°–8°
MAX
0.10
0.020
MIN
FLAT
MAX
Dwg. MH-015 in
0°–8°
0.51
MIN
FLAT
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.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dwg. MH-015 mm
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘LT’
(SOT-89/TO-243AA)
Dimensions in Inches
(for reference only)
0.173
0.181
0.064
0.072
0.155
0.167
1
2
0.055
0.063
3
0.090
0.102
0.014
0.017
0.084
0.090
0.014
0.019
0.017
0.022
0.035
0.047
0.059
BSC
0.118
BSC
Dwg. MA-009-3 in
Dimensions in Millimeters
(controlling dimensions)
4.40
4.60
1.62
1.83
3.94
4.25
1
2
1.40
1.60
3
2.29
2.60
0.35
0.44
2.13
2.29
0.36
0.48
0.89
1.20
0.44
0.56
1.50
BSC
3.00
BSC
Dwg. MA-009-3 mm
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
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 design of its products.
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 which may result from its use.
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
HALL-EFFECT SENSORS SELECTION GUIDE
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
3210
3361
3362
3161
3141
3235
E/L
E
E
E
E
E/L
S
5140
3142
3143
3144
3122
3123
3121
3150
E
E/L
E/L
E/L
E/L
E/L
E/L
J
+50
±70
+120
+120
+160
+160
+175
-25
+200
+230
+340
+350
+400
+440
+450
+40 to +850
+5.0
±5.0
+50
+50
+30
+10
+25
-175
+50
+75
+165
+50
+140
+180
+125
–
10
7.7
5.0*
5.0*
20
55
15*
15*
55
55
55
55
105
105
105
20
Notes
chopper stabilized
micropower, chopper stabilized
2-wire, chopper stabilized
2-wire, chopper stabilized
2-wire
1
output 1
output 2
300 mA output
2
2
1, 3
programmable, chopper stabilized
1
†
HALL-EFFECT LATCHES & BIPOLAR SWITCHES in order of BOP and Bhys
3260
E/L
+30
-30
20
bipolar, 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 outputs
1, 3, 5
3626
S
+150
-150
200
400 mA outputs
1, 3, 5
3195
E/L
+160
-160
220
1, 4
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*
5
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. Power driver output.
4. Active pull down.
5. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control.
* Minimum.
† 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