sensing and productivity solutions datasheet magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r description honeywells magnetoresistive sensor ics (integrated circuits), standard power series, are ultra-sensitive devices designed for manufacturers who need a durable and reliable speed or position sensor for large air gaps or small magnetic felds in standard power (typically 3 vdc to 24 vdc) applications. unlike reed switches and other magnetic sensors, honeywells solid state design offers ultra-high sensitivity of 11 g max., making it the highest sensitivity sensor in its class for standard powered applications. the magnetoresistive sensor ics, standard power series, 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 identifed, simplifying installation and potentially reducing system cost. value to customers ? durable and reliable due to magnetic solid state, non-contact, no-glass design which enhance switching capability. ? cost-effective and flexible due to the sensor ics ultra-high sensitivitythe highest sensitivity sensor in its class for standard powered applicationswhich lowers the customers cost of magnets and simplifies design-in. ? simplifies design-in for wired applications due to its supply voltage range, omnipolar operation, sot-23 and flat to-92- style package options and wide operating temperature range. differentiation ? ultra-high sensitivity (sm351rt and sm451r) allows for potential use in applications requiring ultra-high magnetic sensitivity (7 g typical operate, 11 g maximum operate). 323 0 4118 issue b sm351rt SM353RT sm451r sm453r features ? magnetic sensitivities: - ultra-high sensitivity (sm351rt and sm451r): for applications requiring ultra-high magnetic sensitivity (7 g typical operate, 11 g maximum operate) - very high sensitivity (SM353RT and sm453r): for applications requiring very high magnetic sensitivity (14 g typical operate, 20 g maximum operate) ? package styles: - sot-23 (sm351rt, SM353RT) - flat to-92-style (sm451r, sm453r) ? supply voltage range 3 vdc to 24 vdc ? omnipolar sensing activates with either pole from a magnet ? temperature range -40 c to 85 c [-40 f to 185 f] ? sot-23 supplied on tape and reel (3000 units per reel) ? rohs-compliant materials meet directive 2002/95/ec potential applications industrial ? high frequency flow sensing in hvac, water, fuel meters, and gas utility meters ? anti-tamper detection in water, electric, and gas utility meters ? liquid level detection ? motor rpm sensing ? in-cylinder position sensing medical ? rpm sensing in exercise and rehabilitation equipment ? magnetic interrupt in exercise and rehabilitation equipment ? absence/presence detection in infusion pumps ? position sensing of medication dispensing cabinet drawers ? incline position sensing in hospital beds white goods ? lid, door and drawer position detection ? fluid flow detection ? liquid level detection portfolio honeywells standard power series join: ? magnetoresistive sensor ics, including the nanopower series , 2ss52m series , ss552mt series ? hall-effect sensor ics, including the ss351a, ss451a
2 table 1. electrical specifications (3 v < vcc < 24 v, -40 c < ta < 85 c [-40 f < ta < 185 f] unless otherwise specified.) c characteristic condition min. typ. max. unit supply voltage (vcc) vcc reference to ground 3 12 24 v supply current: off on vcc = 5 v, t = 25 c [77 f] vcc = 5 v, t = 25 c [77 f 2.5 4 8 3.5 5 ma start-up time vcc > 3 v 10 s output leakage current vcc = 24, off 10 a output saturation voltage load current = 20 ma 500 mv rise time fall time vcc = 5 v, r = 2 kohm, c = 20 pf vcc = 5 v, r = 2 kohm, c = 20 pf 1.5 1.5 s notice 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. table 3. absolute maximum ratings c characteristic condition min. typ. max. unit operating temperature ambient -40 [-40] 85 [185] c [f] soldering temperature: sm351rt, SM353RT sm451r, sm453r ambient applied for < 10 s ambient applied for < 3 s 245 [473] 260 [500] c [f] supply voltage (vs) -26 26 v load current output sinking (open collector) 40 a notice the magnetic feld strength (gauss) required to cause the switch to change state (operate and release) will be as specifed in the magnetic characteristics. to test the switch against the specifed magnetic characteristics, the switch must be placed in a uniform magnetic feld. notice these magnetoresistive sensor ics may have an initial output in either the on or off state if powered up with an applied magnetic feld in the differential zone (applied magnetic feld >brp and SM353RT, sm453r: operate (positive) release (positive) differential 6 3 14 9.3 5.7 20 18 gauss ca ution electr os tatic sensi tive devices do no t open or handle ex cept at a st at ic free wo rkst at ion esd sensi tivi ty : cla ss 3a sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
3 figure 2. block/electrical diagram figure 1. typical magnetic performance versus temperature sm351rt, sm451r SM353RT, sm453r am r sensor tr igger circuit and ampli er output (o ) vc c (+) gnd (-) magnetic switch point (gauss) 0 1 2 3 4 5 -40 [-40] -20 [-4] 0 [32] 20 [68] 40 [104] 60 [140] 80 [176] 6 7 8 9 10 release gauss operate gauss te mper atur e (c [f]) differential gauss differential gauss magnetic switch point (gauss) 0.0 2.0 4.0 6.0 8.0 10.0 -40 [-40] -20 [-4] 0 [32] 20 [68] 40 [104] 60 [140] 80 [176] 12.0 14.0 16.0 18.0 release gauss operate gauss t emper atur e (c [f]) sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
4 figure 3. alignment of the magnet to the sot-23 package (sm351rt, SM353RT) omnipolar magnetoresistive sensor ic ideal alignment: the magnet is aligned in the same plane as the sensor ic. offset alignment: the magnet is not aligned in the same plane as the sensor ic. sm351r t, sm353r t sensor ic magnet magnet mo v ement magnet sm351r t, sm353r t sensor ic magnet mo v ement magnet the sensor ic detects the approaching magnets horizontal magnetic fux 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 fux lines are now horizontal (see figure 3.c). (note: this alignment decreases the magnetic fux strength at the sensor ic.) the magnetic fux lines stay horizontal as the magnet approaches the sensor ic (see figure 3.a) . dead zones may occur when the majority of the magnets magnetic fux lines become vertical as it approaches the sensor ic, turning the sensor ic on, then off, then on (see figure 3.b). perpendicular magnet approach to the sensor ic eliminates possible dead zones. parallel magnet approach to the sensor ic may cause dead zones. figure 3.a figure 3.b figure 3.c magnet sm351r t, sm353r t sensor ic magnet mo v ement end vie w t op vie w sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
5 figure 4. alignment of the magnet to the to-92-style package (sm451r, sm453r) omnipolar magnetoresistive sensor ic ideal alignment: the magnet is aligned in the same plane as the sensor ic. offset alignment: the magnet is not aligned in the same plane as the sensor ic . magnet magnet mo v ement sm451r, sm453r sensor ic end vie w t op vie w magnet mo v ement magnet sm451r, sm453r sensor ic sm451r, sm453r sensor ic magnet mo v ement magnet the sensor ic detects the approaching magnets horizontal magnetic fux 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 fux lines are now horizontal (see figure 4.c). (note: this alignment decreases the magnetic fux strength at the sensor ic.) the magnetic fux lines stay horizontal as the magnet approaches the sensor ic (see figure 4.a) . dead zones may occur when the majority of the magnets magnetic fux lines become vertical as it approaches the sensor ic, turning the sensor ic on, then off, then on (see figure 4.b). perpendicular magnet approach to the sensor ic eliminates possible dead zones. parallel magnet approach to the sensor ic may cause dead zones. figure 4.a figure 4.b figure 4.c sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
6 figure 5. sm351rt and SM353RT sensor ic, tape and reel mounting dimensions (for reference only. mm/[in].) e 0,20 [0.008] 1,40 [0.055] 0,061 [0.002] 3,1 5 [0.1 24] 3,20 [0.1 25] 1,5 [0.059] 2,00 [0.079] 4,00 [0.1 57] 4,00 [0.1 57] 8,0 [0.31 5] 1,75 [0.069] 3,50 [0.1 38] 1,00 min. [0.039] t op co ver t ape section a- a a a 60,0 [2.362] 1 0,9 [0.429] 1 4,4 [0.567] 8,40 [0.331] 40,0 [1 .57] 4,00 [0.1 57] 10 [0.394] 20,2 [0.795] 2,0 [0.079] 1 3,0 [0.51 2] 17 8 [7 .000] mea sured at hub mea sured at hub mea sured at outer edge min. max. reel tape sensor sensor showing polarity 3 gnd (-) 2,90 [0.114] 1 vcc (+) 2 output 1,20 [0.047] 0,77 [0.030] 0,60 [0.024] 0,787 [0.031] 0,41 3 [0.0 16 ] 1,90 [0.075] 0,95 [0.037] 3x 0,40 typ . [0.0 16 ] 2,80 [0.1 10 ] 1,60 [0.063] nominal to amr effect sensing surf ac e 6 1 6 1 or 0,1 5 [0.006] to centerline of aml element 0,1 5 [0.006] nominal to ic center 1,40 max. [0.1 10 ] sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
7 table 4. order guide catalog listing description sm351rt magnetoresistive sensor ic, ultra-high sensitivity (7 g typ.), standard power, sot-23 package, pocket tape and reel packaging (3000 units per reel) SM353RT magnetoresistive sensor ic, very high sensitivity (14 g typ.), standard power, sot-23 package, pocket tape and reel packaging (3000 units per reel) sm451r magnetoresistive sensor ic, ultra-high sensitivity (7 g typ.), standard power, flat to-92-style package, bulk packaging (1000 units per bag) sm453r magnetoresistive sensor ic, very high sensitivity (14 g typ.), standard power, flat to-92-style package, bulk packaging (1000 units per bag) 3x 0,38 [0.0 15 ] 3 gnd (-) 1 vcc (+) 2 output 1,89 [0.07 4] ic sensing surf ac e 4,00 [0.0 16 ] 3x 0,38 [0.0 15 ] 0,75 [0.003] 1,52 [0.06] 2,50 [0.1 0] 3x 0,56 max. [0.02] 2x 1,27 max. [0.02] 3,00 [0.1 2] 1 4,5 [0.57] 6 1 6 1 or figure 6. sm451r and sm453r mounting dimensions (for reference only. mm/[in].) sensor showing polarity sensor sensing and productivity solutions magnetoresistive sensor ics standard power series: sm351rt, sm451r, SM353RT, sm453r
warranty/remedy honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship. honeywells 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 buyers 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 web site, 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. 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. 32304118-b-en il50 november 2015 ? 2015 honeywell international inc. all rights reserved. additional information the following associated literature is available on the honeywell web site at sensing.honeywell.com: ? product installation instructions ? product aplication note ? magnetic sensors line guide ? position sensors range guide ? magnetic sensors selection chart ? magnetic sensors line card 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 sensing and productivity solutions 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 productivity solutions honeywell 1985 douglas drive north golden valley, mn 55422 honeywell.com
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