A3185LT [ALLEGRO]
HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION; 霍尔效应锁存器高温作业
| 型号： | A3185LT |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION |
| 文件： | 总8页 (文件大小：182K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3185 THRU
3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE OPERATION
These Hall-effect latches are extremely temperature-stable and stress-
resistant 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 ele-
ment. 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.
V
CC
Each device includes on a single silicon chip a voltage regulator, qua-
dratic 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.
1
2
3
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 SOT-
89/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-mini-
SIP.
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
FEATURES
A
I Symmetrical Switch Points
I Superior Temperature Stability
I Operation From Unregulated Supply
I Open-Collector 25 mA Output
I Reverse Battery Protection
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
I Activate With Small, Commercially Available Permanent Magnets
I Solid-State Reliability
I Small Size
Suffix ‘E–’................... -40°C to +85°C
Suffix ‘L–’................. -40°C to +150°C
Storage Temperature Range,
I 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 .
TS ............................... -65°C to +170°C
3185 THRU 3189
HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
3
OUTPUT
GROUND
X
2
Dwg. FH-005-3
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits
Characteristic
Symbol
VCC
Test Conditions
Min.
3.8
—
Typ.
—
Max.
24
Units
V
Supply Voltage
Operating
Output Saturation Voltage
Output Leakage Current
Supply Current
VOUT(SAT)
IOFF
IOUT = 20 mA, B > BOP
VOUT = 24 V, B < BRP
B < BRP (Output OFF)
B > BOP (Output ON)
RL = 820 Ω, CL = 20 pF
RL = 820 Ω, CL = 20 pF
175
0.05
4.75
5.7
400
5.0
8.0
—
mV
µA
—
ICC
—
mA
mA
ns
—
Output Rise Time
Output Fall Time
tr
tf
—
100
100
—
—
—
ns
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers*
A3185
Min.
A3187
Min.
A3188
Min.
A3189
Characteristic
Max.
270
Max.
150
175
-50
Max.
180
200
-100
-80
Min.
50
Max.
230
250
-50
BOP at TA = 25°C
170
140
-270
-300
340
280
50
50
100
80
over operating temp. range
BRP at TA = 25°C
300
50
-170
-140
540
-150
-175
100
100
-180
-200
200
160
-230
-250
100
100
over operating temp. range
-50
-50
B
hys at TA = 25°C
300
350
360
400
460
500
over operating temp. range
600
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
300
200
100
0
150
100
50
OPERATE POINT
OPERATE POINT
V
= 12 V
V
= 12 V
CC
CC
0
-50
-100
RELEASE POINT
RELEASE POINT
-100
-150
-200
-300
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
Dwg. GH-027
Dwg. GH-026
SUPPLY CURRENT
OUTPUT SATURATION VOLTAGE
7.0
6.0
300
I
= 20 mA
OUT
V
= 12 V
CC
V
= 4.5–24 V
CC
200
B ≥ B
OP
5.0
4.0
100
B ≤ B
RP
0
-50
150
150
100
125
125
-25
0
25
50
75
100
-50
-25
0
25
50
75
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
Dwg. GH-028
Dwg. GH-029
OPERATE POINT
SUPPLY CURRENT
10
20
15
8.0
6.0
4.0
T
= +25°C
A
B ≥ B
OP
10
B ≤ B
RP
5.0
T
= +25°C
2.0
0
0
A
-5.0
0
5
10
15
20
25
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-030
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)
OPERATION
In operation, the output transistor is OFF until the strength of the mag-
netic field perpendicular to the surface of the chip exceeds the threshold or
operate point (BOP). When the field strength exceeds BOP, the output transis-
tor switches ON and is capable of sinking 25 mA of current.
Package Designators “LT”
ACTIVE AREA DEPTH
0.030"
0.090"
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).
0.76 mm
2.27 mm
NOM
0.050"
1.27 mm
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
2
3
Dwg. MH-008-4B
V
Package Designator “U”
BB
30 V
MAX
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.092"
2.33 mm
0.077"
1.96 mm
B
B
OP
RP
A
V
OUT(SAT)
BRANDED
SURFACE
0
1
2
3
-B
0
+B
FLUX DENSITY
Dwg. GH-034-4
Dwg. MH-002-7B
The simplest form of magnet that will operate these devices is a ring
magnet, as shown below. Other methods of operation are possible.
Package Designators “UA” and "UA-TL"
ACTIVE AREA DEPTH
0.018"
0.083"
0.46 mm
2.10 mm
NOM
0.060"
1.51 mm
A
BRANDED
SURFACE
1
2
3
Dwg. A-11,899
Dwg. MH-011-4B
APPLICATIONS INFORMATION
Although sensor location is accurate to three
sigma for a particular design, product improve-
ments may result in small changes to sensor
location.
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°
45°
0.018
0.46
0.086
MAX
1
2
3
2.18
MAX
1
2
3
0.600
0.560
15.24
14.23
0.015
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
1.57
1.47
45°
45°
0.122
0.117
3.10
2.97
45°
45°
0.031
0.79
0.085
MAX
2.16
MAX
1
2
3
1
2
3
0.640
0.600
16.26
15.24
0.015
0.38
SEE NOTE
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’)
0.095
0.005
2.41
0.13
0.002
0.051
MAX
MAX
0°–8°
0°–8°
0.004
0.10
0.020
MIN
FLAT
0.51
MIN
FLAT
MAX
MAX
Dwg. MH-015 in
Dwg. MH-015 mm
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
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
0.055
0.063
0.181
0.014
0.017
0.064
0.072
0.090
0.102
0.084
0.090
0.155
0.167
2
3
1
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
1.40
1.60
0.35
0.44
2.29
2.60
2.13
2.29
3.94
4.25
2
3
1
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 responsi-
bility 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 Avail. Oper.
Number
Characteristics at T = +25°C
A
Temp.
B
B
B
Features
Notes
OP(max)
RP(min)
hys(typ)
HALL-EFFECT UNIPOLAR SWITCHES in order of B and B
OP
hys
3240
3210
3361
3362
3161
3141
3235
E/L
E
E
E
E
+50
70
+5.0
5.0
10
7.7
5.0*
5.0*
20
chopper stabilized
1
micropower, chopper stabilized
2-wire, chopper stabilized
2-wire, chopper stabilized
2-wire
+120
+120
+160
+160
+175
-25
+50
+50
+30
+10
+25
-175
+50
+75
+165
+50
+140
+180
+125
–
E/L
S
55
15*
15*
55
55
55
output 1
output 2
300 mA output
2
2
1, 3
5140
3142
3143
3144
3122
3123
3121
3150
E
+200
+230
+340
+350
+400
+440
+450
+40 to +850
E/L
E/L
E/L
E/L
E/L
E/L
J
55
105
105
105
20
programmable, chopper stabilized
1
†
HALL-EFFECT LATCHES & BIPOLAR SWITCHES in order of B
and B
hys
OP
3260
3280
3134
3133
3281
3132
3187
3177
3625
3626
3195
3197
3175
3188
3283
3189
3275
3185
E/L
E/L
E/L
K/L/S
E/L
K/L/S
E/L
S
S
S
E/L
L
S
+30
+40
+50
+75
+90
+95
+150
+150
+150
+150
+160
+160
+170
+180
+180
+230
+250
+270
-30
-40
-50
-75
-90
-95
-150
-150
-150
-150
-160
-160
-170
-180
-180
-230
-250
-270
20
45
27
52
100
52
100*
200
200
200
220
230
200
200*
300
100*
100*
340*
bipolar, chopper stabilized
chopper stabilized
bipolar switch
bipolar switch
chopper stabilized
bipolar switch
900 mA outputs
400 mA outputs
1, 3, 5
1, 3, 5
1, 4
1
E/L
E/L
E/L
S
chopper stabilized
5
E/L
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
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