description the ss351at and SS451A sensors are small, versatile digital hall - effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet . they are designed to r espond to a either a north pole or a south pole . these o mn ipolar s ensors are sensitive and flexible devices designed to meet a wide range of potential applications. the ss351at and SS451A have a typical operating point of 85 g at 25 c [77 f]. because they can be operated by a north pole or a south pole, the y do not require the magnet polarity to be identified, thus making the installation easier and potentially reducing the system cost. these sensors are available in two package styles. the ss351at is available in the sub m iniature sot - 23 surface mount pac kage; the SS451A is available in the leaded, flat to - 92 - style package. the ss351ats small size requires less pc board space, allowing it to be used in smaller assemblies. its 3 v dc capability allows for use in low voltage applications, promoting energy ef ficiency. the ss351at is available on tape and reel (3000 units per reel); the SS451A is available in a bulk package (1000 units per bag). featu res subminiature package size (ss351at) supplied on tape and reel allows for a compact design with automat ed component placement, helping to reduce manufacturing costs simple activation from a north pole or a south pole and sensitive magnetics make this omnipolar product suitable in a variety of potential motion control, lid closure detection, and displacement sensing applications low voltage 3 v dc capability helps reduce power consumption built - in reverse polarity protection protects the device from potential damage during installation thermally balanced integrated circuit provides for stable operation over a wide temperature range of - 40 to 150 c [ - 40 f to 302 f] rohs - compliant materials meet directive 2002/95/ec potential applications commercial: speed and rpm (revolutions per minute) sensing in fitness equipment magnetic encoder for building access damper or valve position control in hvac (heating, ventilation and air conditioning) equipment flow rate sensing in appliances and water softeners printer head position sensing industrial: flow rate sensing in industrial processes robotic control (cylinder position monitoring) float - based fluid level sensing medical: displacement sensor in hospital beds and medical equipment medication bin monitor on portable drug carts
2 www.honeywell.co m/sensing table 1. ss351at/SS451A specifications ( at vs=3.0 vdc to 24 vdc, 20 ma load, t a = - 40 c to 150 c [ - 40 f to 257 f]) characteristic condition minimum typical maximum unit supply voltage 1 : v dc SS451A - 40 c to 150 c [ - 40 f to 302 f] 3 C 24 ss351at - 40 c to 125 c [ - 40 f to 257 f] 3 C 24 ss351at 150 c [302 f] 3 C 1 2 supply current vsupply = 5 v at 25 c [77 f] vsupply = 3 v at 25 c [77 f] C C C 4.5 3.5 C 6 5 9 ma output current C C C 20.0 ma vsat at 20 ma, gauss > bop p ositive or gauss < bop negative C C 0.4 v output leakage current gauss > bop+ or < bop - C C 10 a output switching time: rise fall vsupply = 12 v at 25 c [77 f], r l =1.6 kohm, c l = 20 pf C C C C 1.5 1.5 s thermal resistance: C c/w SS451A C 233 C ss351at C 303 C ss351at/SS451A: C gauss operate positive 35 85 135 operate negative - 135 - 85 - 35 ss351at/SS451A: C gauss release positive 10 50 120 release negative - 120 - 50 - 10 ss351at/SS451A gauss differential C 5 35 80 operating temperature C - 40 [ - 40] C 150 [302] c [ f] stora ge temperature C - 40 [ - 40] C 150 [302] c [ f] note 1 : see figure 1. table 2. ss351at/SS451A absolute maximum ratings 1 characteristic minimum typical maximum unit supply voltage - 28.0 C 28.0 v applied output voltage - 0.5 C 28.0 v output current C C 20 ma magnetic flux C C no limit gauss note 1 : 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 ch aracteristics, the switch must be placed in a uniform magnetic field. 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 guaran teed as the maximum limits (above recommended operating conditions) are approached, nor will the device necessarily operate at absolute maximum ratings. figure 1. ss351at rated supply voltage figure 2. current sinking output block diagram
honeywell sensing and control 3 figur e 3. typical ss351at/SS451A magnetic performance vs temperature figure 4 . wiring diagrams f igure 5 . ss3 5 1 a t mounting /t ape and reel dimensions (for reference only. mm/[in])
sensing and control honeywell 1 985 douglas drive north golden valley, mn 55422 www.honeywell.com/sensing 00 5 917 - 1 - en il50 glo printed in usa november 2009 ? 2009 honeywell international inc . all rights reserved. figure 6. SS451A mounting dimensions (f or reference only. mm/[in]) o rder g uide catalog listing description ss351at omnipolar, hall - effect digital position sensor, sot - 23 package, tape and reel packaging (3000 units per reel) SS451A omnipolar, hall - effect digital position sensor, flat to - 9 2 package, bulk packaging (1000 units per bag) 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 t hese instructions could result in death or serious injury. w arranty/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 b y 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 liab le 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. specificatio ns 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 misuse of documentat ion the information presented in this product sheet is f or 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 offices, representatives and distributors. for application assistance, current specifications, pricing or name of the nearest authorized dist ributor, contact your local sales office or: e - mail : info.sc@honeywell.com internet: www.honeywell.com/sensing phone and fax: asia pacific +65 6355 - 2828 +65 6445 - 3033 fax europe +44 (0) 1698 481 481 +44 (0) 1698 481676 fax latin america +1 - 305 - 805 - 818 8 +1 - 305 - 883 - 8257 fax usa/canada +1 - 800 - 537 - 6945 +1 - 815 - 235 - 6847 +1 - 815 - 235 - 6545 fax
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