3185 ALLEGRO
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Technical content
FOR HIGH-TEMPERATURE OPERATION These Hall-effect latches are extremely temperature-stable and stress- resistant 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 ele- ment. 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, qua- dratic 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 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 Sheet27609.2A ABSOLUTE MAXIMUM RATINGS at TA = +25°C Operating Temperature Range, TA Storage Temperature Range,
FEATURES
I Symmetrical Switch Points I Superior Temperature Stability I Operation From Unregulated Supply I Open-Collector 25 mA Output I Reverse Battery Protection I Activate With Small, Commercially Available Permanent Magnets I Solid-State Reliability I Small Size I Resistant to Physical Stress Pinning is shown viewed from branded side. 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
Dwg. PH-003A 1SUPPLY VCC GROUND OUTPUT X
3185 THRU 3189
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000 ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating 3.8 — 24 V Output Saturation Voltage V OUT(SAT) IOUT = 20 mA, B > BOP — 175 400 mV Output Leakage Current I OFF VOUT = 24 V, B < BRP — 0.05 5.0 µA Supply Current I CC B < BRP (Output OFF) — 4.75 8.0 mA B > BOP (Output ON) — 5.7 — mA Output Rise Time t r RL = 820 Ω, CL = 20 pF — 100 — ns Output Fall Time t f RL = 820 Ω, CL = 20 pF — 100 — ns MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range. Part Numbers* A3185 A3187 A3188 A3189 B OP at TA = 25°C 170 270 50 150 100 180 50 230 over operating temp. range 140 300 50 175 80 200 50 250 BRP at TA = 25°C -270 -170 -150 -50 -180 -100 -230 -50 over operating temp. range -300 -140 -175 -50 -200 -80 -250 -50 Bhys at TA = 25°C 340 540 100 300 200 360 100 460 over operating temp. range 280 600 100 350 160 400 100 500 FUNCTIONAL BLOCK DIAGRAM NOTES: BOP = operate point (output turns ON); B RP = release point (output turns OFF); B hys = 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). VCC X REG. Dwg. FH-005-3 GROUND OUTPUT Copyright © 1995, 1999, Allegro MicroSystems, Inc.
TYPICAL OPERATING CHARACTERISTICS A3185* SWITCH POINTS A3187* SWITCH POINTS * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT, U, or UA). OUTPUT SATURATION VOLTAGE SUPPLY CURRENT SUPPLY CURRENT OPERATE POINT 0 50 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-027 SWITCH POINT IN GAUSS 100 -50 -100 OPERATE POINT RELEASE POINT V = 12 V CC 150 150 -150 -25 25 75 125 0 25 50 75 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-028 125-25 V = 12 VCC B ≤ B RP SUPPLY CURRENT IN mA 7.0 6.0 5.0 4.0 B ≥ B OP 15002 5 5 07 5 100 300 AMBIENT TEMPERATURE IN °C 200 100 -50 Dwg. GH-029 SATURATION VOLTAGE IN mV 150-25 125 I = 20 mA V = 4.5–24 V OUT CC 10 15 20 25 SUPPLY VOLTAGE IN VOLTS Dwg. GH-037 CHANGE IN OPERATE POINT IN GAUSS -5.0 5.0 T = +25°CA 0 50 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-026 SWITCH POINT IN GAUSS 100 200 -100 -200 OPERATE POINT RELEASE POINT V = 12 V CC 150 300 -300 -25 25 75 125 10 15 20 25 SUPPLY VOLTAGE IN VOLTS Dwg. GH-030 SUPPLY CURRENT IN mA 2.0 4.0 6.0 8.0 B ≥ B OP B ≤ B RP T = +25°CA
Worcester, Massachusetts 01615-0036 (508) 853-5000 SENSOR LOCATIONS (±0.005” [0.13 mm] die placement) Package Designators “LT” 1 32 Dwg. MH-008-4B 0.030" 0.76 mm NOM ACTIVE AREA DEPTH 0.050" 1.27 mm 0.090" 2.27 mm A Package Designator “U” 1 32 Dwg. MH-002-7B 0.015" 0.38 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.077" 1.96 mm 0.092" 2.33 mm A Package Designators “UA” and "UA-TL" 1 32 Dwg. MH-011-4B 0.018" 0.46 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.083" 2.10 mm 0.060" 1.51 mm A The simplest form of magnet that will operate these devices is a ring magnet, as shown below. Other methods of operation are possible. Dwg. A-11,899 OPERATION In operation, the output transistor is OFF until the strength of the mag- netic field perpendicular to the surface of the chip exceeds the threshold or operate point (B OP). When the field strength exceeds BOP, the output transis- tor 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 (B RP). 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. 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. 30 V MAX 0+ B OUTPUT VOLTAGE IN VOLTS FLUX DENSITY Dwg. GH-034-4 RPB VOUT(SAT) BBV OPB Although sensor location is accurate to three sigma for a particular design, product improve- ments may result in small changes to sensor location.
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. PACKAGE DESIGNATOR ‘U’ Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) Dwg. MH-003D in 0.063 0.059 0.018 0.015 0.016 0.050 1 2 3 0.100 45° SEE NOTE 0.183 0.178 0.181 0.176 0.600 0.560 0.086 MAX Dwg. MH-003D mm 1.60 1.50 0.46 0.38 0.41 1.27 1 2 3 2.54 45° SEE NOTE 4.65 4.52 4.60 4.47 15.24 14.23 2.18 MAX Devices in the ‘U’ package are NOT RECOMMENDED FOR NEW DESIGN
Worcester, Massachusetts 01615-0036 (508) 853-5000 Surface-Mount Lead Form (Suffix ‘-TL’) 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. Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) PACKAGE DESIGNATOR ‘UA’ 0.095 ±0.005 0.020 MIN FLAT Dwg. MH-015 in 0.004 MAX 0.002 MAX 0°–8° 2.41 ±0.13 0.51 MIN FLAT Dwg. MH-015 mm 0.10 MAX 0.051 MAX 0°–8° Dwg. MH-014D mm 4.17 4.04 1.57 1.47 0.38 1.27 BSC 45° 16.26 15.24 0.41 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE Dwg. MH-014D in 0.164 0.159 0.062 0.058 0.015 0.050 BSC 45° 0.640 0.600 0.016 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE
NOTE: Exact body and lead configuration at vendor’s option within limits shown. PACKAGE DESIGNATOR ‘LT’ (SOT-89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) Dwg. MA-009-3 in 1 23 0.064 0.072 0.155 0.167 0.059 BSC 0.014 0.0190.035 0.047 0.090 0.102 0.055 0.063 0.014 0.017 0.084 0.0900.017 0.022 0.118 BSC 0.173 0.181 Dwg. MA-009-3 mm 1 23 4.40 4.60 1.62 1.83 3.94 4.25 1.50 BSC 0.36 0.480.89 1.20 2.29 2.60 1.40 1.60 0.35 0.44 2.13 2.290.44 0.56 3.00 BSC 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 responsi- bility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
Worcester, Massachusetts 01615-0036 (508) 853-5000 HALL-EFFECT SENSORS SELECTION GUIDE Partial Part Avail. Oper. Characteristics at T A = +25°C Number Temp. B OP(max) BRP(min) Bhys(typ) Features Notes HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys 3240 E/L +50 +5.0 10 chopper stabilized 1 3210 E ±70 ±5.0 7.7 micropower, chopper stabilized 3361 E +120 +50 5.0* 2-wire, chopper stabilized 3362 E +120 +50 5.0* 2-wire, chopper stabilized
3161 E +160 +30 20 2-wire
3141 E/L +160 +10 55
3235 S +175 +25 15* output 1 2
-25 -175 15* output 2 2
5140 E +200 +50 55 300 mA output 1, 3
3142 E/L +230 +75 55
3143 E/L +340 +165 55
3144 E/L +350 +50 55
3122 E/L +400 +140 105
3123 E/L +440 +180 105
3121 E/L +450 +125 105
3150 J +40 to +850 – 20 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: 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.