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Part: A3185LUA
Category:
Description: Hall-effect Latch For High-temperature Operation
Company: Allegro Micro Systems, Inc.
Datasheet: Download A3185LUA datasheet File size : 607 kB
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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 +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 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 -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 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.
OUTPUT
SUPPLY
Devices in the `U' package are LAST-TIME BUY Orders accepted only until April 18, 2002 FEATURES
s s s s s s s s s 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
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C 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' .......... -40°C to +85°C Suffix `L' ........ -40°C to +150°C Storage Temperature Range, TS ....... -65°C to +170°C
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 VC C VO U T ( S A T ) I OFF I CC Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, 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 µA mA mA ns ns
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers* A3185 Characteristic BOP at TA = 25°C over operating temp. range BRP at TA = 25°C over operating temp. range Bhys at TA = 25°C 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 © 1995, 2002 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 = 4.524 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 = +25°C 10
SUPPLY CURRENT IN mA
6.0
B B OP
B B RP 4.0
5.0
2.0
T A = +25°C
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).
www.allegromicro.com
3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION
(±0.005" [0.13 mm] die placement) Package Designators "LT"
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.090" 2.27 mm 0.050" 1.27 mm
SENSOR LOCATIONS
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. Powering up in the absence of a magnetic field (less than BOP and higher than BRP) will allow an indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP.
A
1 2 3
Dwg. MH-008-4C
Package Designator "U"
0.092" 2.33 mm
0.077" 1.96 mm
OUTPUT VOLTAGE IN VOLTS
ACTIVE AREA DEPTH 0.0165" 0.42 mm NOM
30 V MAX
VBB
B RP
B OP
A
BRANDED SURFACE 1 2 3
VOUT(SAT)
0 -B
Dwg. MH-002-7C
0 FLUX DENSITY
+B
Dwg. GH-034-4
Package Designators "UA" and "UA-TL"
ACTIVE AREA DEPTH 0.0195" 0.50 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
Allegro
A
BRANDED SURFACE 1 2 3
Dwg. A-11,899
Dwg. MH-011-4C
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 0.0189 0.0142
SEE NOTE
0.0173 0.0138
15.24 14.23 0.48 0.36
SEE NOTE
0.44 0.35
0.050 0.100
Dwg. MH-003E in
1.27 2.54
Dwg. MH-003E mm
Devices in the `U' package are LAST-TIME BUY Orders accepted only until April 18, 2002
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.
www.allegromicro.com
Others parts begin by a3
A3-1 A3-2 A3-3 A3-4
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