datasheet magnetoresistive sensor ics nanopower series
2 magnetoresistive sensor ics honeywells 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. high sensitivity ? nanopower ? high sensitivity: 7 gauss typ., 11 gauss max. (sm351lt); 14 g typ., 20 gauss max. (SM353LT) ? nanopower: average current of 360 na typ. (sm351lt) and 310 na typ. (SM353LT) ? supply voltage range: 1.65 vdc to 5.5 vdc; simplifies design-in ? omnipolar sensing: activates with either pole from a magnet ? temperature range: -40 c to 85 c [-40 f to 185 f] ? push-pull output: does not require external pull-up resistor ? non-chopper stabilized design ? rohs-compliant materials: meets directive 2002/95/ec ? package: sot-23 p otential applications industrial ? mobile equipment (i.e., handheld computing equipment, scanners) ? water, electric and gas utility meters ? building access control; reed switch replacement for battery- operated security systems ? industrial smoke detectors medical ? exercise equipment ? infusion pumps ? drawer position sensing (e.g., medical cabinets) ? hospital beds white goods ? lid, door and drawer position detection ? fluid fow medium-sized consumer electronics ? battery-optimization position sensor sensing.honeywell.com
3 table 1 a . 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. u nit supply voltage (vs) 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 sleep current 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 sleep time 30 100 180 ms average current: sm351lt SM353LT 0.015% duty cycle, typ. 360 310 6640 6350 na output voltage: low (v ol ) high (v oh ) load current = 100 a 0 vs - 0.15 0.03 vs - 0.03 0.15 vs v table 1b. electrical specifications (vs = 1.8 v, ta = 25 c [77 f].) characteristic condition min. typ. max. u nit 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 average current: sm351lt SM353LT 0.015% duty cycle, typ. 350 350 620 600 na sensing.honeywell.com magnetoresistive sensor ics, nanopower series
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. a bsolute maximum ratings characteristic condition min. typ. max. u nit 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 5.5 v output (load) current 100 150 a figure 1. block/electrical d iagram 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 SM353LT: operate (positive) release (positive) hysteresis 6 3 * 14 10 4 20 gauss *at 1.65 v and -40 c, the hysteresis can reach 0.1 gauss. magnetoresistive sensor ics, nanopower series
5 0 2 4 6 8 10 12 -4 0- 20 02 04 06 08 0 release poin t t emper at ur e (c) magnetic s witch p oint (gauss) operate poin t figure 2. sm351lt typical performance characteristics magnetic performance vs temperature (vs = 1.8 v) period vs temperature a verage current vs temperature a ctive mode time vs temperature t emper at ur e (c) time ( ms ) 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y 0 20 40 60 80 100 120 140 160 180 -4 0- 20 02 04 06 08 0 t emper at ur e (c) av er ag e cur re nt ( a ) 0. 0 0. 5 1. 0 1. 5 2. 0 2. 5 3. 0 3. 5 -4 0- 20 02 04 06 08 0 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y t emper at ur e (c) time ( s) 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y 0 5 10 15 20 25 -4 0- 20 02 04 06 08 0 figure 3. SM353LT typical performance characteristics magnetic performance vs temperature (vs = 1.8 v) period vs temperature a verage current vs temperature a ctive mode time vs temperature 0 2 4 6 8 10 12 14 16 18 20 -4 0- 20 02 04 06 08 0 t emper at ur e (c) magnetic s witch p oint (gauss) operat e p oint r elease p oint t emper at ur e (c) time ( ms ) 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y 0 20 40 60 80 100 120 140 160 -4 0- 20 02 04 06 08 0 t emper at ur e (c) av er ag e cur r ent ( a ) 0. 0 0. 5 1. 0 1. 5 2. 0 2. 5 3. 0 3. 5 -4 0- 20 02 04 06 08 0 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y t emper at ur e (c) time ( s ) 1 .80 vdc suppl y 1 .65 vdc suppl y 5.50 vdc suppl y 0 5 10 15 20 25 -4 0- 20 02 04 06 08 0 sensing.honeywell.com magnetoresistive sensor ics, nanopower series
figure 4. mounting and tape/reel d imensions (for reference only. mm/[in].) e 6 sensing.honeywell.com 3 gnd (-) 2,90 [0.114] 1 vcc (+) 2 output 1,45 [0.057] 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 ic sensing surf ac e nominal to ic center 6 1 6 1 or 0,1 3 [0.005] 0,20 [0.008] 1,40 [0.055] 0,061 [0.002] 3,1 5 [0.1 24] 3,20 [0.1 25] 1,50 [0.059] 2,00 [0.079] 4,00 [0.1 57] 4,00 [0.1 57] 8,00 [0.31 5] 1,75 [0.069] 3,50 [0.1 38] 1,00 [0.039] t op co ver t ape 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 magnetoresistive sensor ics, nanopower series
50095501-a-en il50 april 2014 ? 2014 honeywell international inc. all rights reserved. order guide catalog listing d escription 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) add ition a l inform a tion the following associated literature is available at sensing.honeywell.com : ? product line guide ? product range guide ? product installation instructions ? application note w a rr a nty/reme d y 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 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. w arning personal inju ry 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. w arning misuse of document a tion ? the information presented in this product sheet 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. sales and service honeywell serves its customers through a worldwide network of sales offces, representatives and distributors. for application assistance, current specifcations, pricing or name of the nearest authorized distributor, contact your local sales offce or email us at info.sc@honeywell.com . visit us on the web at sensing.honeywell.com phone and fax: asia pacifc +65 6355-2828 +65 6445-3033 fax europe +44 (0) 1698 481481 +44 (0) 1698 481676 fax latin america +1-305-805-8188 +1-305-883-8257 fax usa/canada +1-800-537-6945 +1-815-235-6847 +1-815-235-6545 fax sensing and control honeywell 1985 douglas drive north golden valley, mn 55422 honeywell.com
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