A3122ELTTR [ALLEGRO]
Analog Circuit, 1 Func, PSSO3, TO-243AA, SOT-89, 3 PIN;
| 型号： | A3122ELTTR |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Analog Circuit, 1 Func, PSSO3, TO-243AA, SOT-89, 3 PIN 开关 |
| 文件： | 总8页 (文件大小：152K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3121, 3122, AND
3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE OPERATION
These Hall-effect switches are monolithic integrated circuits with
tighter magnetic specifications, designed to operate continuously over
extended temperatures to +150°C, and are more stable with both tem-
perature and supply voltage changes. The unipolar switching character-
istic makes these devices ideal for use with a simple bar or rod magnet.
The three basic devices (3121, 3122, and 3123) are identical except for
magnetic switch points.
Each device includes a voltage regulator for operation with supply
voltages of 4.5 voltas to 24 volts, reverse battery protection diode,
quadratic Hall-voltage generator, temperature compensation circuitry,
small-signal amplifier, Schmitt trigger, and an open-collector output to
sink up to 25 mA. With suitable output pull up, they can be used with
bipolar or CMOS logic circuits. The 3121 is an improved replacement
for the 3113 and 3119.
V
CC
1
2
3
The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for the automotive and
industrial temperature range of -40°C to +85°C. Suffix ‘L–’ is for the
automotive and military temperature range of -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 and BENEFITS
A
I Superior Temp. Stability for Automotive or Industrial Applications
Supply Voltage, VCC ...........................30 V
Reverse Battery Voltage, VRCC ........ -30 V
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, VOUT ................ 28 V
Reverse Output Voltage, VOUT ........ -0.5 V
Continuous Output Current, IOUT ... 25 mA
Operating Temperature Range, TA
I 4.5 V to 24 V Operation … Needs Only An Unregulated Supply
I Open-Collector 25 mA Output … Compatible with Digital Logic
I Reverse Battery Protection
I Activate with Small, Commercially Available Permanent Magnets
I Solid-State Reliability … No Moving Parts
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
TS .............................. -65°C to +170°C
Always order by complete part number, e.g., A3121EU .
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits
Characteristic
Symbol
Test Conditions
Operating
Min.
4.5
—
Typ.
—
Max.
Units
Supply Voltage
VCC
24
V
Output Saturation Voltage
Output Leakage Current
Supply Current
VOUT(SAT)
IOUT = 20 mA, B > BOP
VOUT = 24 V, B < BRP
104m04V0
<1.010
—
IOFF
ICC
tr
—
µA
B < BRP
(Output
OFF)
—
4.6
9.0mA
Output Rise Time
Output Fall Time
RL = 820 Ω, CL = 20 pF
RL = 820 Ω, CL = 20 pF
0.04
0.18
2.0
2.0
µs
µs
tf
—
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers*
A3121
Typ.
A3122
Typ.
440
A3123
Typ.
Characteristic
Min.
Max.
Min.
Max.
Min.
Max
BOP at TA = 25°C
250350450
range
280340040250345
over
operating
temp.
temp.
temp.
220305050 260340430 230345
470
BRP at TA = 25°C
125
245
380
140235
410
330 180240030
over
operating
range
80245
120235
360 160240330
57010 140
Bhys at TA = 25°C
75010 140
range
75010 140
56010 150
75010 140
57010 140
over
operating
NOTES: Typical values are at TA = +25°C and VCC = 12 V.
OP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP).
B
*Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
3
2
OUTPUT
GROUND
X
Dwg. FH-005-2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1992, 1999, Allegro MicroSystems, Inc.
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
OUTPUT SATURATION VOLTAGE
0
400
300
200
I
= 20 mA
OUT
OPERATE POINT
V
= 4.5–24 V
CC
0
RELEASE POINT
0
V
= 12 V
CC
100
0
0
-50
150
100
125
-50
-25
0
25
50
75
100
125
150
-25
0
25
50
75
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
Dwg. GH-040
Dwg. GH-038
SUPPLY CURRENT
SUPPLY CURRENT
7.0
6.0
5.0
4.0
10
8.0
6.0
4.0
V
= 12 V
CC
B ≥ B
OP
B ≥ B
OP
B ≤ B
RP
T
= +25°C
2.0
0
A
B ≤ B
RP
125
150
100
-50
-25
0
25
50
75
0
5
10
15
20
25
AMBIENT TEMPERATURE IN °C
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041
Dwg. GH-039
* Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
OPERATION
SENSOR LOCATIONS
( 0.005" [0.13 mm] die placement)
The output of these devices (pin 3) switches low when the mag-
netic field at the Hall sensor exceeds the operate point threshold (BOP).
At this point, the output voltage is VOUT(SAT). When the magnetic field
is reduced to below the release point threshold (BRP), the device output
goes high. 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 mechani-
cal vibration and electrical noise.
Suffix “LT”
ACTIVE AREA DEPTH
0.030"
0.089"
0.76 mm
2.26 mm
NOM
0.043"
1.09 mm
APPLICATIONS INFORMATION
A
Hall effect applications information is available in the “Hall-Effect
IC Applications Guide”, which can be found in the latest issue of
Allegro MicroSystems Data Book AMS-702.
1
2
3
Dwg. MH-008-2C
Suffix “U”
ACTIVE AREA DEPTH
CHANGE IN OPERATE POINT
0.016"
0.41 mm
NOM
0.091"
2.31 mm
20
0.070"
1.78 mm
15
T
= +25°C
A
A
10
BRANDED
SURFACE
1
2
3
5.0
Dwg. MH-002-2B
0
Suffix “UA”
ACTIVE AREA DEPTH
0.019"
0.48 mm
NOM
-5.0
0.082"
2.07 mm
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-042
0.055"
1.38 mm
A
BRANDED
SURFACE
1
2
3
Dwg. MH-011-2C
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘LT’
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.
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
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
2.18
MAX
1
2
3
1
2
3
15.24
14.23
0.600
0.560
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
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
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
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.
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
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 responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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