A3185, A3187, A3188, and A3189 Protected Quad Driver with Fault Detection and Sleep Mode Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: October 31, 2005 Recommended Substitutions: For existing customer transition, and for new customers or new applications: • For the A3185, refer to the A1225 • For the A3187, refer to the A1227 • For the A3188, refer to the A1229 • For the A3189, refer to the A1229 NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. 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. Data Sheet 27609.2c * 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION X These Hall-effect latches are extremely temperature-stable and stressresistant devices 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. SUPPLY 1 2 3 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. OUTPUT CC GROUND V 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. Dwg. PH-003A Pinning is shown viewed from branded side. 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 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 . 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION FUNCTIONAL BLOCK DIAGRAM 1 VCC REG. X 3 OUTPUT 2 GROUND Dwg. FH-005-3 ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. Limits Characteristic Symbol Supply Voltage VCC Min. Typ. Max. Units Operating 3.8 — 24 V VOUT(SAT) IOUT = 20 mA, B > BOP — 175 400 mV Output Leakage Current IOFF VOUT = 24 V, B < BRP — 0.05 5.0 µA Supply Current ICC B < BRP (Output OFF) — 4.75 8.0 mA B > BOP (Output ON) — 5.7 — mA Output Saturation Voltage Test Conditions Output Rise Time tr RL = 820 Ω, CL = 20 pF — 100 — ns Output Fall Time tf RL = 820 Ω, CL = 20 pF — 100 — 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. BOP at TA = 25°C 170 270 50 150 100 180 50 230 140 300 50 175 80 200 50 250 -270 -170 -150 -50 -180 -100 -230 -50 -300 -140 -175 -50 -200 -80 -250 -50 340 540 100 300 200 360 100 460 280 600 100 350 160 400 100 500 over operating temp. range BRP at TA = 25°C over operating temp. range Bhys at TA = 25°C over operating temp. range 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 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 A3187* SWITCH POINTS 150 300 200 100 OPERATE POINT SWITCH POINT IN GAUSS SWITCH POINT IN GAUSS OPERATE POINT 100 V CC = 12 V 0 -100 50 V CC = 12 V 0 -50 RELEASE POINT RELEASE POINT -100 -200 -150 -50 -300 -50 0 -25 50 25 100 75 150 125 -25 0 25 75 50 SUPPLY CURRENT OUTPUT SATURATION VOLTAGE 7.0 I OUT = 20 mA VCC = 12 V SUPPLY CURRENT IN mA V CC = 4.5–24 V 200 100 6.0 B ≥ B OP 5.0 B ≤ B RP 0 -50 -25 0 25 50 100 75 125 4.0 -50 150 -25 0 AMBIENT TEMPERATURE IN °C 25 50 125 100 75 AMBIENT TEMPERATURE IN ° C 150 Dwg. GH-028 Dwg. GH-029 OPERATE POINT SUPPLY CURRENT 10 CHANGE IN OPERATE POINT IN GAUSS 20 8.0 SUPPLY CURRENT IN mA 150 Dwg. GH-027 Dwg. GH-026 300 SATURATION VOLTAGE IN mV 125 100 AMBIENT TEMPERATURE IN ° C AMBIENT TEMPERATURE IN °C B ≥ B OP 6.0 B ≤ B RP 4.0 T A = +25°C 2.0 0 15 T A = +25°C 10 5.0 0 -5.0 0 5 10 15 SUPPLY VOLTAGE IN VOLTS 20 25 Dwg. GH-030 0 5 10 15 SUPPLY VOLTAGE IN VOLTS 20 25 Dwg. GH-037 * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT or UA). www.allegromicro.com 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION ELEMENT LOCATIONS (±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 A 1 2 3 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. Dwg. MH-008-4C Package Designators “UA” 0.083" 2.10 mm 0.060" 1.51 mm A BRANDED SURFACE 1 2 OUTPUT VOLTAGE IN VOLTS ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 30 V MAX VBB B RP B OP 3 VOUT(SAT) 0 Dwg. MH-011-4C Although element location is accurate to three sigma for a particular design, product improvements may result in small changes to element location. -B 0 FLUX DENSITY +B Dwg. GH-034-4 The simplest form of magnet that will operate these devices is a ring magnet, as shown below. Other methods of operation are possible. Allegro Dwg. A-11,899 APPLICATIONS INFORMATION Extensive applications information on magnets and Hall-effect devices 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 ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 0.063 0.055 2 1 3 Dimensions in Millimeters (controlling dimensions) 0.090 0.084 0.102 0.090 4.25 3.94 0.0189 0.0142 0.0221 0.0173 0.047 0.035 0.059 BSC 4.60 4.40 1.83 1.62 0.0173 0.0138 2 1 BSC 3.00 BSC Dwg. MA-009-3A in Dwg. MA-009-3A mm 2.5 2.0 0.098 0.079 B B 0.031 0.102 A 0.8 2.6 A 0.181 1 2 2.29 2.13 0.56 0.44 1.50 BSC 2.60 2.29 3 0.44 0.35 0.48 0.36 1.20 0.89 0.118 1.60 1.40 4.6 3 0.047 0.028 0.031 TYP TYP 1 2 3 1.2 0.7 0.8 TYP TYP 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 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 Dwg. MA-012-3 in Dwg. MA-012-3 mm 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. www.allegromicro.com 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION PACKAGE DESIGNATOR ‘UA’ Dimensions in Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 0.164 0.159 4.17 4.04 0.062 0.058 45° 1.57 1.47 45° 0.122 0.117 3.10 2.97 45° 45° 0.085 1 2 3 0.031 2.16 1 2 0.79 3 MAX MAX 0.640 0.600 16.26 15.24 0.0173 0.0138 0.0189 0.0142 SEE NOTE 0.44 0.35 0.48 0.36 SEE NOTE 1.27 0.050 BSC BSC Dwg. MH-014E in Dwg. MH-014E mm Radial Lead Form (order A318xxUA-LC) 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). 1 2 3 0.108" (2.74 mm) 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 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). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION 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; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 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. However, 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. www.allegromicro.com