3189

A3195X ALLEGRO

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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 SOT89/ TO-243AA transistor package for surface-mount applications; suffix ‘–UA’ is a three-lead ultra-mini-SIP. Data Sheet27609.2B* 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 V CC 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 or UA). VCC X REG. Dwg. FH-005-3 GROUND OUTPUT Copyright © 1995, 2002 Allegro MicroSystems, Inc.

www.allegromicro.com 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 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) Allegro Package Designators “LT” 1 32 Dwg. MH-008-4C 0.0305" 0.775 mm NOM ACTIVE AREA DEPTH 0.050" 1.27 mm 0.090" 2.27 mm A Package Designators “UA” 1 32 Dwg. MH-011-4C 0.0195" 0.50 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 (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 B OP and higher than BRP) will allow an indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP. 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.

www.allegromicro.com Dwg. MA-009-3A in 1 23 0.072 0.064 0.167 0.155 0.059 BSC 0.0189 0.01420.047 0.035 0.102 0.090 0.063 0.055 0.0173 0.0138 0.090 0.0840.0221 0.0173 0.118 BSC 0.181 0.173 Dwg. MA-009-3A mm 1 23 4.60 4.40 1.83 1.62 4.25 3.94 1.50 BSC 0.48 0.361.20 0.89 2.60 2.29 1.60 1.40 0.44 0.35 2.29 2.130.56 0.44 3.00 BSC PACKAGE DESIGNATOR ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. B 0.098 0.031 0.102 0.047 0.181 0.079 Dwg. MA-012-3 in Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.028 TYP 0.031 TYP A 3 13 B 2.5 0.8 2.6 1.2 4.6 2.0 Dwg. MA-012-3 mm Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.7 TYP 0.8 TYP A

Worcester, Massachusetts 01615-0036 (508) 853-5000 Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) PACKAGE DESIGNATOR ‘UA’ 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. Supplied in bulk pack (500 pieces per bag). Dwg. MH-014E in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 BSC 45° 0.640 0.600 0.0189 0.0142 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE Dwg. MH-014E mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 BSC 45° 16.26 15.24 0.48 0.36 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE Radial Lead Form (order A318xxUA-LC) NOTE: Lead-form dimensions are the nominals produced on the forming equipment. No dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag). 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 0.108" (2.74 mm) 123

www.allegromicro.com 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; 5,917,320; 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. How- ever, 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.

Worcester, Massachusetts 01615-0036 (508) 853-5000 HALL-EFFECT SENSORS LATCHING HALL-EFFECT DIGITAL SWITCHES Partial Operate Release Hysteresis Replaces Part Point (G) Point (G) (G) Oper. and Number Over Oper. Voltage & Temp. Range Temp. Packages Comments UGN3175 15 to 180 -180 to -15 >80 (Typ 180) S LT, UA UGN3177 25 to 150 -150 to -25 >50 (Typ 180) S LT, UA A3185x 140 to 300 -300 to -140 280 to 600 E/L LT, UA A3187x 50 to 175 -175 to -50 100 to 350 E/L LT, UA 3077, 3175, 3177 A3188x 80 to 200 -200 to -80 160 to 400 E/L LT, UA A3189x 50 to 250 -250 to -50 100 to 500 E/L LT, UA 3075, 3076 A3280x 5 to 40 -40 to -5 10 to 80 E/L LH, LT, UA chopper stabilized A3281x 15 to 90 -90 to -15 30 to 180 E/L LH, LT, UA chopper stabilized A3283x 100 to 180 -180 to -100 <400 (Typ 300) E/L LH, LT, UA chopper stabilized “PROTECTED” LATCHING HALL-EFFECT DIGITAL SWITCHES Partial Operate Release Hysteresis Part Point (G) Point (G) (G) Oper. Number Over Oper. Voltage & Temp. Range Temp. Packages Comments A3195x 40 to 200 -200 to -40 >110 (Typ 220) E, L U, LT active pulldown A3197x 40 to 200 -200 to -40 >110 (Typ 230) E, L U, LT open-collector output Notes: 1) Typical data is at TA = +25°C and nominal operating voltage. 2) “x” = Operating Temperature Range [suffix letter or (prefix)]: S (UGN) = -20 °C to +85°C, E = -40°C to +85°C, J = -40°C to +115°C, K (UGS) = -40°C to +125°C, L (UGL) = -40°C to +150°C.