Magnetoresistive Sensor ICs Nanopower Series Datasheet Magnetoresistive Sensor ICs Honeywell's Nanopower Series Magnetoresistive (MR) Sensor ICs are ultra-sensitive devices designed to accommodate a wide range of applications with large air gaps, small magnetic fields and low power requirements. The sensor ICs respond to either a North or South pole applied in a direction parallel to the sensor. They do not require the magnet polarity to be identified, simplifying installation and potentially reducing system cost. These sensor ICs use a very low average current consumption and a push-pull output which does not require a pull-up resistor. The sensor ICs can operate from a supply voltage as low as 1.65 V, promoting energy efficiency. The Nanopower Series is available in two magnetic sensitivities to accommodate a variety of application needs: * SM351LT: For applications requiring ultra high magnetic sensitivity (7 G typical operate, 11 G maximum operate) and a very low current draw (360 nA typical). * SM353LT: For applications requiring very high magnetic sensitivity (14 G typical operate, 20 G maximum operate) and a very low current draw (310 nA typical). These Magnetoresistive Sensor ICs, Nanopower Series, are supplied in the subminiature SOT-23 surface mount package on tape and reel (3000 units per reel), for use in automated pick-and-place component installation. Key Features * * * Potential Applications High sensitivity: 7 Gauss typ., 11 Gauss max. (SM351LT); Industrial 14 G typ., 20 Gauss max. (SM353LT) * Nanopower: Average current of 360 nA typ. (SM351LT) and scanners) 310 nA typ. (SM353LT) * Water, electric and gas utility meters Supply voltage range: 1.65 Vdc to 5.5 Vdc; simplifies * Building access control; reed switch replacement for battery- design-in * Mobile equipment (i.e., handheld computing equipment, Omnipolar sensing: Activates with either pole from a operated security systems * Industrial smoke detectors magnet * Temperature range: -40 C to 85 C [-40 F to 185 F] MEDICAL * Push-pull output: Does not require external pull-up resistor * Exercise equipment * Non-chopper stabilized design * Infusion pumps * RoHS-compliant materials: Meets Directive 2002/95/EC * Drawer position sensing (e.g., medical cabinets) * Package: SOT-23 * Hospital beds WHITE GOODS * Lid, door and drawer position detection * Fluid flow MEDIUM-SIZED CONSUMER ELECTRONICS * Battery-optimization position sensor HIGH SENSITIVITy * NANOPOWEr 2 sensing.honeywell.com Magnetoresistive Sensor ICs, Nanopower Series Table 1A. Electrical Specifications (Vs = 1.65 V to 5.5 V, Ta = -40 C to 85 C [-40 F to 185 F], Typ. at 1.8 V, 25 C [77 F] unless otherwise specified.) Characteristic Condition Min. Typ. Max. Unit Vs reference to ground 1.65 1.8 5.5 V Awake current: SM351LT SM353LT -- -- 0.3 1 0.8 5 5 mA Awake time -- -- 15 -- s -- Vs = 1.65 V Vs = 1.8 V Vs = 5.5 Vdc -- -- -- -- 0.2 0.16 0.2 2.6 8 0.8 1 8 A -- 30 100 180 ms Average current: SM351LT SM353LT 0.015% duty cycle, typ. -- -- 360 310 6640 6350 nA Output voltage: low (VOL) high (VOH) load current = 100 A 0 Vs - 0.15 0.03 Vs - 0.03 0.15 Vs V Supply voltage (Vs) Sleep current Sleep time NOTICE These magnetoresistive sensor ICs may have an initial output in either the ON or OFF state if powered up with an applied magnetic field in the differential zone (applied magnetic field >Brp and <Bop). Honeywell recommends allowing 10 s for output voltage to stabilize after supply voltage has reached its final rated value. Table 1B. Electrical Specifications (Vs = 1.8 V, Ta = 25 C [77 F].) Characteristic Condition Min. Typ. Max. Unit Awake current: SM351LT SM353LT -- -- -- 1 0.8 1.12 0.87 mA Awake time -- -- 15 -- s Sleep current -- -- 0.2 0.59 A Sleep time -- 90 100 120 ms 0.015% duty cycle, typ. -- -- 350 350 620 600 nA Average current: SM351LT SM353LT NOTICE The sensor will turn LOW when the magnetic field is present and switch to HIGH when the field is removed. The sensor will latch and hold the state during the sleep "mode". sensing.honeywell.com 3 Magnetoresistive Sensor ICs, Nanopower Series Table 2. Magnetic Specifications (Vs = 1.65 V to 5.5 V, Ta = -40 C to 85 C [-40 F to 185 F].) Characteristic Min. Typ. Max. SM351LT: operate (positive) release (positive) hysteresis 3 2 7 5 2 11 -- -- SM353LT: operate (positive) release (positive) hysteresis 6 3 14 10 4 20 -- -- * * Unit Gauss Gauss *At 1.65 V and -40 C, the hysteresis can reach 0.1 Gauss. NOTICE The magnetic field strength (Gauss) required to cause the switch to change state (operate and release) will be as specified in the magnetic characteristics. To test the switch against the specified magnetic characteristics, the switch must be placed in a uniform magnetic field. Table 3. Absolute Maximum Ratings Condition Min. Typ. Max. Unit Operating temperature ambient -40 [-40] -- 85 [185] C [F] Soldering temperature ambient applied for <10 s -- -- 265 [509] C [F] Supply voltage (Vs) -- -0.5 -- 6 V Output (load) current -- -- -- 5 mA Characteristic NOTICE CAUTION Absolute maximum ratings are the extreme limits that the device will withstand without damage to the device. However, the electrical and mechanical characteristics are not guaranteed as the maximum limits (above recommended operating conditions) are approached, nor will the device necessarily operate at absolute maximum ratings. Figure 1. Block/Electrical Diagram VS+ Clock Counter Decoder Output Flip Q D Flop V AMR 0 Gnd- 4 sensing.honeywell.com Dual Threshold Comparator Out ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN OR HANDLE EXCEPT AT A STATIC FREE WORKSTATION ESD SENSITIVITY: CLASS 2 Magnetoresistive Sensor ICs, Nanopower Series Figure 2. Alignment of the Magnet to the Omnipolar Magnetoresistive Sensor IC Ideal alignment: The magnet is aligned in the same plane as the sensor IC. Figure 2.A The magnetic flux lines stay horizontal as the magnet approaches the sensor IC (see Figure 2.A). SM351LT, SM353LT Sensor IC Magnet Magnet movement Offset alignment: The magnet is not aligned in the same plane as the sensor IC. Parallel magnet approach to the sensor IC may cause dead zones. Figure 2.B Dead zones may occur when the majority of the magnet's magnetic flux lines become vertical as it approaches the sensor IC, turning the sensor IC to ON, then OFF, then ON (see Figure 2.B). Magnet Magnet SM351LT, SM353LT Sensor IC Magnet movement Perpendicular magnet approach to the sensor IC eliminates possible dead zones. The sensor IC detects the approaching magnet's horizontal magnetic flux lines, turning the sensor IC to ON. The sensor IC stays ON as the magnet continues to approach. When the magnet is located directly over the sensor IC, all magnetic flux lines are now horizontal (see Figure 2.C). (Note: This alignment decreases the magnetic flux strength at the sensor IC.) Figure 2.C Magnet SM351LT, SM353LT Sensor IC end view top view Magnet movement sensing.honeywell.com 5 Magnetoresistive Sensor ICs, Nanopower Series Figure 3. SM351LT Typical Performance Characteristics Magnetic Performance vs Temperature (Vs = 1.8 V) Period vs Temperature 180 160 10 140 8 1.65 Vdc Supply 120 Operate Point Time (ms) Magnetic Switch Point (Gauss) 12 6 100 Release Point 4 1.80 Vdc Supply 80 60 5.50 Vdc Supply 40 2 20 0 0 -40 -20 0 20 40 60 80 -40 -20 0 Temperature (C) Average Current vs Temperature 3.5 40 60 80 Active Mode Time vs Temperature 25 5.50 Vdc Supply 3.0 20 1.65 Vdc Supply 2.5 1.80 Vdc Supply 2.0 Time (s) Average Current (A) 20 Temperature (C) 1.5 15 10 5.50 Vdc Supply 1.0 5 0.5 1.80 Vdc Supply 1.65 Vdc Supply 0.0 -40 -20 0 20 0 40 80 60 -40 -20 0 20 40 80 60 Temperature (C) Temperature (C) Figure 4. SM353LT Typical Performance Characteristics Period vs Temperature 20 160 18 140 1.65 Vdc Supply 16 120 Operate Point 14 Time (ms) Magnetic Switch Point (Gauss) Magnetic Performance vs Temperature (Vs = 1.8 V) 12 Release Point 10 80 8 60 6 40 4 1.80 Vdc Supply 100 5.50 Vdc Supply 20 2 0 0 -40 -20 0 20 40 60 -40 80 -20 0 20 40 80 60 Temperature (C) Temperature (C) Average Current vs Temperature Active Mode Time vs Temperature 3.5 25 5.50 Vdc Supply 20 2.5 1.65 Vdc Supply 1.80 Vdc Supply 2.0 Time (s) Average Current (A) 3.0 1.5 10 5.50 Vdc Supply 1.0 0.5 5 1.80 Vdc Supply 1.65 Vdc Supply 0.0 -40 -20 0 20 Temperature (C) 6 15 sensing.honeywell.com 40 60 80 0 -40 -20 0 20 Temperature (C) 40 60 80 Magnetoresistive Sensor ICs, Nanopower Series Figure 5. Mounting and Tape/Reel Dimensions (For reference only. mm/[in].) e Sensor Sensor Showing Polarity 2,90 [0.114] 3 GND (-) 2,80 [0.110] Nominal to IC center 16 or 1,60 [0.063] 61 1 VCC (+) 2 OUTPUT 3X 0,40 TYP. [0.016] 0,95 [0.037] 1,90 [0.075] 0,13 [0.005] Nominal to IC sensing surface 0,413 [0.016] 0,77 [0.030] 1,40 Max. 1,20 [0.047] [0.055] 0,60 [0.024] Tape 0,787 [0.031] 4,00 [0.157] 4,00 [0.157] 2,00 [0.079] 0,20 [0.008] 1,50 [0.059] 1,75 [0.069] 8,00 [0.315] 3,50 [0.138] 3,20 [0.125] 0,061 Top [0.002] cover tape 1,40 [0.055] Reel 1,00 [0.039] 3,15 [0.124] 10,9 [0.429] Measured at outer edge 4,00 [0.157] 40,0 [1.57] 10 [0.394] 14,4 [0.567] Measured at hub 60,0 [2.362] 2,0 [0.079] 178 Max. [7.000] 13,0 [0.512] 7 sensing.honeywell.com 20,2 Min. [0.795] 8,40 Measured at [0.331] hub sensing.honeywell.com 7 Table 4. Order Guide Catalog Listing Description SM351LT Magnetoresistive sensor IC, high sensitivity (7 G typ.), nanopower, SOT-23 package, tape and reel packaging (3000 units per reel) SM353LT Magnetoresistive sensor IC, high sensitivity (14 G typ.), nanopower, SOT-23 package, tape and reel packaging (3000 units per reel) ADDITIONAL INFORMATION The following associated literature is available at sensing.honeywell.com: * Product line guide * Product range guide * Product installation instructions * Application note WARNING PERSONAL INJURY DO NOT USE these products as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Failure to comply with these instructions could result in death or serious injury. WARNING MISUSE OF DOCUMENTATION * * The information presented in this datasheet is for reference only. Do not use this document as a product installation guide. Complete installation, operation, and maintenance information is provided in the instructions supplied with each product. Failure to comply with these instructions could result in death or serious injury. WARRANTY/REMEDY Find out more Honeywell serves its customers through a worldwide network of sales offices, representatives and distributors. For application assistance, current specifications, pricing or name of the nearest Authorized Distributor, contact your local sales office. To learn more about Honeywell's sensing and control products, call +1-815-235-6847 or 1-800-537-6945, visit sensing.honeywell.com, or e-mail inquiries to info.sc@honeywell.com Sensing and Control Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 honeywell.com Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship. Honeywell's standard product warranty applies unless agreed to otherwise by Honeywell in writing; please refer to your order acknowledgement or consult your local sales office for specific warranty details. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace, at its option, without charge those items it finds defective. The foregoing is buyer's sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, or indirect damages. While we provide application assistance personally, through our literature and the Honeywell website, it is up to the customer to determine the suitability of the product in the application. Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this printing. However, we assume no responsibility for its use. 50095501-C-EN IL50 April 2015 (c) 2015 Honeywell International Inc. All rights reserved. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Honeywell: SM351LT SM353LT