3185

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 ‘–UA’ is a three-lead ultra-mini-SIP. Data Sheet 27609.2B* V X CC 1 2 3 GROUND 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 OUTPUT SUPPLY 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 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 VCC VOUT(SAT) IOFF ICC Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) B > BOP (Output ON) Output Rise Time Output Fall Time tr tf RL = 820 Ω, CL = 20 pF RL = 820 Ω, 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 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 = 4.5–24 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 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 Designators “UA” 0.083" 2.10 mm OUTPUT VOLTAGE IN VOLTS 30 V MAX VBB ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.060" 1.51 mm A BRANDED SURFACE 1 2 3 B RP B OP VOUT(SAT) 0 -B Dwg. MH-011-4C 0 FLUX DENSITY +B Dwg. GH-034-4 Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location. 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 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 ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) 0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090 0.063 0.055 0.0173 0.0138 4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29 1.60 1.40 0.44 0.35 1 2 3 0.090 0.084 1 2 3 2.29 2.13 0.047 0.035 0.059 BSC 0.0189 0.0142 0.0221 0.0173 0.118 BSC Dwg. MA-009-3A in 1.20 0.89 1.50 BSC 0.48 0.36 0.56 0.44 3.00 BSC Dwg. MA-009-3A mm 0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031 TYP 2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8 TYP 1 0.028 TYP 2 1 0.7 TYP 2 3 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 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 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 Inches (controlling dimensions) 0.164 0.159 Dimensions in Millimeters (for reference only) 4.17 4.04 45° 0.062 0.058 45° 1.57 1.47 0.122 0.117 45° 0.031 3.10 2.97 45° 0.79 0.085 MAX 1 2 3 2.16 MAX 1 2 3 0.640 0.600 0.0173 0.0138 16.26 15.24 0.44 0.35 SEE NOTE 0.0189 0.0142 SEE NOTE 0.48 0.36 0.050 BSC Dwg. MH-014E in 1.27 BSC 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 0.620" 0.500" (15.7 mm 12.7 mm) 0.108" (2.74 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 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION HALL-EFFECT SENSORS LATCHING HALL-EFFECT DIGITAL SWITCHES Partial Part Number UGN3175 UGN3177 A3185x A3187x A3188x A3189x A3280x A3281x A3283x Partial Part Number A3195x A3197x Operate Release Hysteresis Point (G) Point (G) (G) Over Oper. Voltage & Temp. Range 15 to 180 25 to 150 140 to 300 50 to 175 80 to 200 50 to 250 5 to 40 15 to 90 100 to 180 -180 to -15 -150 to -25 -300 to -140 -175 to -50 -200 to -80 -250 to -50 -40 to -5 -90 to -15 -180 to -100 >80 (Typ 180) >50 (Typ 180) 280 to 600 100 to 350 160 to 400 100 to 500 10 to 80 30 to 180 110 (Typ 220) >110 (Typ 230) Oper. Temp. E, L E, L Packages U, LT U, LT Comments active pulldown 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000