A3121EUA-TL [ALLEGRO]
Analog Circuit, 1 Func, PSSO3, SMT-3;
| 型号： | A3121EUA-TL |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Analog Circuit, 1 Func, PSSO3, SMT-3 |
| 文件： | 总8页 (文件大小：157K) |
| 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 (A3121, A3122, and A3123) are identical except
for magnetic switch points.
Each device includes a voltage regulator for operation with supply
voltages of 4.5 volts to 24 volts, reverse battery protection diode, qua-
dratic 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 A3121 is an improved replacement for the
UGx3113 and UGx3119.
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 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-mini-SIP.
Dwg. PH-003A
Pinning is shown viewed from branded side.
FEATURES and BENEFITS
■ Superior Temp. Stability for Automotive or Industrial Applications
■ 4.5 V to 24 V Operation … Needs Only An Unregulated Supply
■ Open-Collector 25 mA Output … Compatible with Digital Logic
■ Reverse Battery Protection
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
A
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
■ Activate with Small, Commercially Available Permanent Magnets
■ Solid-State Reliability … No Moving Parts
■ Small Size
■ Resistant to Physical Stress
The A3121xU is last-time buy. Orders accepted
until October 28, 2002.
The A3122xU and A3123xU are discontinued —
Suffix ‘E–’ ................. -40°C to +85°C
Suffix ‘L–’ ............... -40°C to +150°C
Storage Temperature Range,
shown for reference only.
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, 2002 Allegro MicroSystems, Inc.
2
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
OUTPUT SATURATION VOLTAGE
300
400
300
200
I
= 20 mA
OUT
OPERATE POINT
V
= 4.5–24 V
CC
200
RELEASE POINT
100
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).
www.allegromicro.com
3
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
OPERATION
SENSOR LOCATIONS
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.
(±0.005" [0.13 mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.0305"
0.089"
0.775 mm
2.26 mm
NOM
0.043"
1.09 mm
APPLICATIONS INFORMATION
A
Extensive applications information for Hall-effect sensors is
available in:
1
2
3
• Hall-Effect IC Applications Guide, Application Note 27701;
• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and
Lead Forming, Application Note 27703.1;
Dwg. MH-008-2D
Suffix “U”
• Soldering of Through-Hole Hall-Sensor Dervices, Application Note
27703; and
• Soldering of Surface-Mount Hall-Sensor Devices, Application Note
27703.2.
ACTIVE AREA DEPTH
0.0165"
0.42 mm
NOM
0.091"
2.31 mm
All are provided in Allegro Electronic Data Book, AMS-702. or at
0.070"
1.78 mm
www.allegromicro.com
Allegro
A
CHANGE IN OPERATE POINT
BRANDED
SURFACE
1
2
3
20
Dwg. MH-002-2C
15
T
= +25°C
A
Suffix “UA”
ACTIVE AREA DEPTH
0.0195"
10
0.082"
2.07 mm
0.50 mm
NOM
5.0
0.055"
1.38 mm
A
0
BRANDED
SURFACE
1
2
3
-5.0
0
5
10
15
20
25
Dwg. MH-011-2D
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-042
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘LT’
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.181
0.173
0.072
0.064
0.063
0.055
4.60
4.40
1.83
1.62
1.60
1.40
0.0173
0.0138
0.44
0.35
0.102
0.090
0.090
0.084
2.60
2.29
2.29
2.13
0.167
0.155
4.25
3.94
2
3
1
2
3
1
0.0189
0.0142
0.0221
0.0173
0.48
0.36
0.047
1.20
0.035
0.89
0.56
0.44
0.059
1.50
BSC
BSC
0.118
3.00
BSC
BSC
Dwg. MA-009-3A in
Dwg. MA-009-3A mm
2.5
2.0
0.098
0.079
B
0.8
B
0.031
2.6
1.2
0.102
0.181
A
2
A
2
4.6
0.047
3
1
1
3
0.028
TYP
0.031
TYP
0.7
TYP
0.8
TYP
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Dwg. MA-012-3 mm
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.
www.allegromicro.com
5
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
2.18
1
2
3
1
2
3
MAX
MAX
0.0173
0.0138
15.24
14.23
0.44
0.35
0.600
0.560
0.0189
0.0142
0.48
0.36
SEE NOTE
SEE NOTE
0.050
0.100
1.27
2.54
Dwg. MH-003E in
Dwg. MH-003E 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
6
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
Dimensions in Inches
(controlling dimensions)
(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°
0.79
0.031
2.16
MAX
0.085
MAX
1
2
3
1
2
3
16.26
15.24
0.44
0.35
0.640
0.600
0.0173
0.0138
0.48
0.36
SEE NOTE
0.0189
0.0142
SEE NOTE
1.27
BSC
0.050
BSC
Dwg. MH-014E mm
Dwg. MH-014E in
Surface-Mount Lead Form (order A312xxUA-TL)
0.095
±0.005
2.41
±0.13
0.002
MAX
0.051
MAX
0°–8°
0°–8°
0.51
MAX
0.004
MAX
0.10
0.020
MIN
FLAT
MIN
FLAT
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.
6. Supplied in bulk pack (500 pieces per bag).
www.allegromicro.com
7
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
8
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