3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION FEATURES. ABSOLUTE MAXIMUM RATINGS at T A = +25 C V CC GROUND OUTPUT SUPPLY

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1 3185 THRU 3189 Data Sheet A X V CC These Hall-effect latches are extremely temperature-stable and stressresistant sensors especially suited for operation over extended temperature ranges to +15 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. SUPPLY GROUND OUTPUT Dwg. PH-3A Pinning is shown viewed from branded side. The first character of the part number suffix determines the device operating temperature range. Suffix E is for -4 C to +85 C, and suffix L is for -4 C to +15 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. ABSOLUTE IMUM RATINGS at T A = +25 C Supply Voltage, V CC... 3 V Reverse Battery Voltage, V RCC V Magnetic Flux Density, B... Unlimited Output OFF Voltage, V OUT... 3 V Reverse Output Voltage, V OUT V Continuous Output Current, I OUT ma Operating Temperature Range, T A Suffix E C to +85 C Suffix L C to +15 C Storage Temperature Range, T S C to +17 C FEATURES 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.

2 1 V CC FUNCTIONAL BLOCK DIAGRAM REG. X 3 OUTPUT 2 GROUND Dwg. FH-5-3 ELECTRICAL CHARACTERISTICS over operating temperature range, at V CC = 12 V. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating V Output Saturation Voltage V OUT(SAT) I OUT = 2 ma, B > B OP mv Output Leakage Current I OFF V OUT = 24 V, B < B RP.5 5. µa Supply Current I CC B < B RP (Output OFF) ma B > B OP (Output ON) 5.7 ma Output Rise Time t r R L = 82 Ω, C L = 2 pf 1 ns Output Fall Time t f R L = 82 Ω, C L = 2 pf 1 ns MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range. Part Numbers* A3185 A3187 A3188 A3189 Characteristic Min. Max. Min. Max. Min. Max. Min. Max. B OP at T A = 25 C over operating temp. range B RP at T A = 25 C over operating temp. range B hys at T A = 25 C over operating temp. range NOTES: B OP = operate point (output turns ON); B RP = release point (output turns OFF); B hys = hysteresis (B OP - B RP ). 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 1536 Worcester, Massachusetts (58) Copyright 1995, 1999, Allegro MicroSystems, Inc.

3 TYPICAL OPERATING CHARACTERISTICS 3185 THRU 3189 A3185* SWITCH POINTS A3187* SWITCH POINTS OPERATE POINT 1 OPERATE POINT SWITCH POINT IN GAUSS V CC = 12 V RELEASE POINT SWITCH POINT IN GAUSS V = 12 V CC RELEASE POINT AMBIENT TEMPERATURE IN C Dwg. GH-26 OUTPUT SATURATION VOLTAGE AMBIENT TEMPERATURE IN C SUPPLY CURRENT Dwg. GH-27 I OUT = 2 ma V CC = V V CC = 12 V SATURATION VOLTAGE IN mv 2 1 SUPPLY CURRENT IN ma B B OP B B RP AMBIENT TEMPERATURE IN C SUPPLY CURRENT Dwg. GH-29 2 AMBIENT TEMPERATURE IN C OPERATE POINT Dwg. GH-28 SUPPLY CURRENT IN ma B B OP B B RP T A = +25 C CHANGE IN OPERATE POINT IN GAUSS T A = +25 C SUPPLY VOLTAGE IN VOLTS Dwg. GH-3 SUPPLY VOLTAGE IN VOLTS * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT, U, or UA). Dwg. GH-37

4 SENSOR LOCATIONS (±.5 [.13 mm] die placement) Package Designators LT ACTIVE AREA DEPTH.3".76 mm NOM A.9" 2.27 mm.5" 1.27 mm 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 (B OP ). When the field strength exceeds B OP, 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 (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. Dwg. MH-8-4B Package Designator U 3 V V BB ACTIVE AREA DEPTH.15".38 mm NOM BRANDED SURFACE A.92" 2.33 mm.77" 1.96 mm OUTPUT VOLTAGE IN VOLTS -B B RP B OP V OUT(SAT) +B FLUX DENSITY Dwg. GH-34-4 Dwg. MH-2-7B Package Designators UA and "UA-TL" The simplest form of magnet that will operate these devices is a ring magnet, as shown below. Other methods of operation are possible. ACTIVE AREA DEPTH.18".46 mm NOM.83" 2.1 mm.6" 1.51 mm A BRANDED SURFACE Dwg. A-11,899 Dwg. MH-11-4B 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 Northeast Cutoff, Box 1536 Worcester, Massachusetts (58) 853-5

5 Dimensions in Inches (controlling dimensions) PACKAGE DESIGNATOR U Dimensions in Millimeters (for reference only) SEE NOTE SEE NOTE.1.5 Dwg. MH-3D in Dwg. MH-3D 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.35" (.89 mm). 5. Where no tolerance is specified, dimension is nominal. 6. Minimum lead length was.5" (12.7 mm). If existing product to the original specifications is not acceptable, contact sales office before ordering.

6 PACKAGE DESIGNATOR UA Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) SEE NOTE.16 SEE NOTE.41.5 Dwg. MH-14D in 1.27 Dwg. MH-14D mm Surface-Mount Lead Form (Suffix -TL ).95 ± ± MIN FLAT Dwg. MH-15 in MIN FLAT Dwg. MH-15 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.35" (.89 mm). 5. Where no tolerance is specified, dimension is nominal. 115 Northeast Cutoff, Box 1536 Worcester, Massachusetts (58) 853-5

7 PACKAGE DESIGNATOR LT (SOT-89/TO-243AA) Dimensions in Inches (for reference only) Dwg. MA-9-3 in Dimensions in Millimeters (controlling dimensions) Dwg. MA-9-3 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.

8 HALL-EFFECT SENSORS SELECTION GUIDE Partial Part Avail. Oper. Characteristics at TA = +25 C Number Temp. BOP(max) BRP(min) Bhys(typ) Features Notes HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys 324 E/L chopper stabilized E ±7 ± micropower, chopper stabilized 3361 E * 2-wire, chopper stabilized 3362 E * 2-wire, chopper stabilized 3161 E wire 3141 E/L S * output * output E ma output 1, E/L E/L E/L E/L E/L E/L J +4 to programmable, chopper stabilized 1 & BIPOLAR SWITCHES in order of BOP and Bhys 326 E/L bipolar, chopper stabilized 328 E/L chopper stabilized 3134 E/L bipolar switch 3133 K/L/S bipolar switch 3281 E/L chopper stabilized 3132 K/L/S bipolar switch 3187 E/L * 3177 S S ma outputs 1, 3, S ma outputs 1, 3, E/L , L S E/L * 3283 E/L chopper stabilized 3189 E/L * 3275 S * E/L * Operating Temperature Ranges: S = -2 C to +85 C, E = -4 C to +85 C, J = -4 C to +115 C, K = -4 C to +125 C, L = -4 C to +15 C 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 1536 Worcester, Massachusetts (58) 853-5

HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS

HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS Data Sheet 27621.3A 3161 X This Hall-effect switch is a monolithic integrated circuit designed to operate continuously over extended temperatures to +85 C. The unipolar switching characteristic makes this