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3185 THRU 3189
HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION
These Hall-effect latches are extremely temperature-stable and stressresistant sensors especially suited for operation over extended temperature ranges to +150C. 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. 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 -40C to +85C, and suffix `L-' is for -40C to +150C. 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.
Data Sheet 27609.2A
V
X
CC
1
2
3
GROUND
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C 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-' ................... -40C to +85C Suffix `L-' ................. -40C to +150C Storage Temperature Range, TS ............................... -65C to +170C
OUTPUT
SUPPLY
FEATURES
I I I I I I I I I 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 GROUND
2
Dwg. FH-005-3
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Symbol VCC VOUT(SAT) IOFF ICC Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) B > BOP (Output ON) Output Rise Time Output Fall Time tr tf RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF Min. 3.8 -- -- -- -- -- -- Typ. -- 175 0.05 4.75 5.7 100 100 Max. 24 400 5.0 8.0 -- -- -- Units V mV A mA mA ns ns
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers* A3185 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. 170 140 -270 -300 340 280 Max. 270 300 -170 -140 540 600 A3187 Min. 50 50 -150 -175 100 100 Max. 150 175 -50 -50 300 350 A3188 Min. 100 80 -180 -200 200 160 Max. 180 200 -100 -80 360 400 A3189 Min. 50 50 -230 -250 100 100 Max. 230 250 -50 -50 460 500
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 (c) 1995, 1999, Allegro MicroSystems, Inc.
3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION
TYPICAL OPERATING CHARACTERISTICS
A3185* SWITCH POINTS
300
150
A3187* SWITCH POINTS
200
OPERATE POINT
100 OPERATE POINT
SWITCH POINT IN GAUSS
100
SWITCH POINT IN GAUSS
50
0
V CC = 12 V
0
V CC = 12 V
-100
-50 RELEASE POINT -100
RELEASE POINT -200
-300 -50 -25 0 25 50 75 100 125 150
Dwg. GH-026
-150 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
AMBIENT TEMPERATURE IN C
Dwg. GH-027
OUTPUT SATURATION VOLTAGE
300
SUPPLY CURRENT
7.0
I OUT = 20 mA V CC = 4.5-24 V
VCC = 12 V
SATURATION VOLTAGE IN mV
SUPPLY CURRENT IN mA
200
6.0 B B OP
100
5.0
B B RP
0 -50
-25
0
25
50
75
100
125
150
4.0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-029
AMBIENT TEMPERATURE IN C
Dwg. GH-028
SUPPLY CURRENT
10
OPERATE POINT
20
8.0
CHANGE IN OPERATE POINT IN GAUSS
15 T A = +25C 10
SUPPLY CURRENT IN mA
6.0
B B OP
B B RP 4.0
5.0
2.0
T A = +25C
0
0 0 5 10 15 20 25
Dwg. GH-030
-5.0 0 5 10 15 20 25
Dwg. GH-037
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
* 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 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.
Package Designators "LT"
ACTIVE AREA DEPTH 0.030" 0.76 mm NOM 0.090" 2.27 mm 0.050" 1.27 mm
A
1 2 3
Dwg. MH-008-4B
Package Designator "U"
ACTIVE AREA DEPTH 0.015" 0.38 mm NOM 0.092" 2.33 mm
30 V MAX
VBB
0.077" 1.96 mm
OUTPUT VOLTAGE IN VOLTS
B RP
B OP
A
BRANDED SURFACE 1 2 3
VOUT(SAT)
0 -B 0 FLUX DENSITY
Dwg. MH-002-7B
+B
Dwg. GH-034-4
Package Designators "UA" and "UA-TL"
ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.083" 2.10 mm
The simplest form of magnet that will operate these devices is a ring magnet, as shown below. Other methods of operation are possible.
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 0.063 0.059
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. 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 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
Surface-Mount Lead Form (Suffix `-TL')
0.095
0.005
2.41
0.13
0.002
MAX
0.051
MAX
0.004 0-8
MAX
0.020
MIN FLAT
Dwg. MH-015 in
0.10
MAX
0-8 0.51
MIN FLAT
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 0.181 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.
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 3240 3210 3361 3362 3161 3141 3235 5140 3142 3143 3144 3122 3123 3121 3150 Avail. Oper. Characteristics at TA = +25C Temp. BOP(max) BRP(min) Bhys(typ) Features HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys E/L E E E E E/L S 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 chopper stabilized micropower, chopper stabilized 2-wire, chopper stabilized 2-wire, chopper stabilized 2-wire output 1 output 2 300 mA output Notes 1
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 = -20C to +85C, E = -40C to +85C, J = -40C to +115C, K = -40C to +125C, L = -40C to +150C 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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