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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 +150C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic 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. 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 -40C to +85C. Suffix `L-' is for the automotive and military temperature range of -40C to +150C. 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.
Data Sheet 27621.4B
V
X
CC
1
2
3
GROUND
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
OUTPUT
SUPPLY
at TA = +25C
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 Suffix `E-' ................. -40C to +85C Suffix `L-' ............... -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
FEATURES and BENEFITS
I Superior Temp. Stability for Automotive or Industrial Applications 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 I Resistant to Physical Stress
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 Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF Min. 4.5 -- -- -- -- -- Typ. -- 140 <1.0 4.6 0.04 0.18 Max. 24 400 10 9.0 2.0 2.0 Units V mV A mA s s
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers* A3121 Characteristic BOP at TA = 25C over operating temp. range BRP at TA = 25C over operating temp. range Bhys at TA = 25C over operating temp. range Min. 250 220 125 80 70 60 Typ. 350 350 245 245 105 105 Max. 450 500 380 410 140 150 Min. 280 260 140 120 70 70 A3122 Typ. 340 340 235 235 105 105 Max. 400 430 330 360 140 140 Min. 250 230 180 160 70 70 A3123 Typ. 345 345 240 240 105 105 Max 440 470 300 330 140 140
NOTES: Typical values are at TA = +25C and VCC = 12 V. BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). *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
VCC
REG.
X
3
OUTPUT GROUND
2
Dwg. FH-005-2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1992, 1999, Allegro MicroSystems, Inc.
3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
400
OUTPUT SATURATION VOLTAGE
0
OPERATE POINT 300
I OUT = 20 mA V CC = 4.5-24 V
SWITCH POINT IN GAUSS
0
RELEASE POINT 200
V CC = 12 V 100
0
0 -50 -25 0 25 50 75 100 125 150
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-038
AMBIENT TEMPERATURE IN C
Dwg. GH-040
SUPPLY CURRENT
7.0
SUPPLY CURRENT
10
VCC = 12 V
8.0
SUPPLY CURRENT IN mA
6.0
B B OP
SUPPLY CURRENT IN mA
B B OP 6.0
5.0
4.0
B B RP
4.0
B B RP
2.0
T A = +25C
-50
-25
0
25
50
75
100
125
150
0 0 5 10 15 20 25
Dwg. GH-041
AMBIENT TEMPERATURE IN C
Dwg. GH-039
SUPPLY VOLTAGE IN VOLTS
* 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
SENSOR LOCATIONS
(0.005" [0.13 mm] die placement) Suffix "LT"
ACTIVE AREA DEPTH 0.030" 0.76 mm NOM 0.089" 2.26 mm
OPERATION
The output of these devices (pin 3) switches low when the magnetic 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 mechanical vibration and electrical noise.
0.043" 1.09 mm
A
1 2 3
APPLICATIONS INFORMATION
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.
Dwg. MH-008-2C
Suffix "U"
ACTIVE AREA DEPTH 0.016" 0.41 mm NOM
CHANGE IN OPERATE POINT
0.091" 2.31 mm
20
CHANGE IN OPERATE POINT IN GAUSS
0.070" 1.78 mm
15 T A = +25C 10
A
BRANDED SURFACE 1 2 3
5.0
Dwg. MH-002-2B
0
Suffix "UA"
ACTIVE AREA DEPTH 0.019" 0.48 mm NOM 0.082" 2.07 mm
-5.0 0 5 10 15 20 25
Dwg. GH-042
SUPPLY VOLTAGE IN VOLTS
A
BRANDED SURFACE 1 2 3
0.055" 1.38 mm
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 0.181 0.064 0.072 0.155 0.167 0.090 0.102
0.055 0.063
0.014 0.017
1
2
3
0.084 0.090
0.035 0.047 0.059
BSC
0.014 0.019 0.017 0.022 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 2.29 2.60
1.40 1.60
0.35 0.44
1
2
3
2.13 2.29
0.89 1.20 1.50
BSC
0.36 0.48 0.44 0.56 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)
0.183 0.178 0.063 0.059
Dimensions in Millimeters (for reference only)
4.65 4.52 1.60 1.50
0.181 0.176 45 0.086
MAX
4.60 4.47 45 2.18
MAX
1
2
3
0.018
1
2
3
0.46
0.600 0.560 0.016
SEE NOTE
0.015
15.24 14.23 0.41
SEE NOTE
0.38
0.050 0.100
Dwg. MH-003D in
1.27 2.54
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)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.015
16.26 15.24
0.38
SEE NOTE
0.016
SEE NOTE
0.41
0.050
BSC
Dwg. MH-014D in
1.27
BSC
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 responsibility 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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