description the ss345 p t/ss4 45 p sensors are small, versatile digital hall - effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet, designed to respond to a single north pole (ss345pt) or south pole (SS445P). these uni polar s ensors are designed to meet the requirements of a wide range of potential applications . the internal pull - up resistor often eliminates the need for external components, further helping to reduce the system cost. these economical unipolar sensors are well suited for simple , high - volume , cost - sensitive position and motion sensing applications. the 2.7 vdc to 7 vdc supply voltage range a llows this device to be use d in low voltage applications . the ss345 pts very small size requires less pcb ( printe d circuit board ) space, allowing it to be used in smaller assemblies. these sensors are available in two package styles : the ss345pt in the sub m iniature sot - 23 surface mount package ; the SS445P is available in the leaded, flat to - 92 - style package. the ss 345pt is available on tape and reel (3000 units per reel) ; the SS445P is available in a bulk package (1000 units per bag) . featu res subminiature package size ( ss345pt ) uses less space on the pcb than standard hall - effect sensor packages such as t o - 92 or sot - 89, allowing for use in smaller assemblies t ape and reel packaging (ss345pt ) allows for automated component placement, helping to reduce manufacturing costs small , flat to - 92 - style package ( SS445P ) is also available simple activation from a n orth pole (ss345pt) or a s outh pole (SS445P) make s these products suitable in a variety of potential applications such as motion control, lid closure detection, and displacement sensing built - in pull - up resistor can easily interface with common electronic circuits without adding external components, helping to reduce total system cost rohs - compliant materials meet directive 2 002/95/ec potential applications commercial: door or lid closure detection in appliances speed and rpm sensing in fitness equipment flow rat e sensing in appliances and water softeners damper or valve position control in hvac equipment printer head position sensing industrial flow rate sensing in industrial processes robotic control ( cylinder position monitoring ) float - based fluid level sensin g medical displacement sensor in hospital bed s and medical equipment medication bin monitor on portable drug carts
2 www.honeywell.com/sensing table 1. ss345pt / SS445P specifications ( at 2.7 to 7 vdc supply , 4 ma load , t a = - 40 o c to 1 50 o c [ - 40 o f to 302 o f] characteristic conditio n minimum typical maximum unit supply v oltage - 40 c to 150 c [ - 40 f to 302 f] 2.7 5.0 7.0 v dc supply current g < 25 , vs = 5 v, 25 c [77f] - 40 c to 150 c [ - 40 f to 302 f] C C 5.5 C C 14 ma output c urrent C C C 4.0 ma vsat g > 260 C C 0.4 v dc output leakage current g < 25 C C 10 a output r ise t ime output f all t ime 25 c [77 f] C C C C 1.5 1. 5 s thermal resistance: ss345pt SS445P C C C 303 233 C C c/w operate - 40 c to 150 c [ - 40 f to 302 f] 55 1 80 2 80 g release - 40 c to 150 c [ - 40 f to 302 f] 25 1 05 2 40 g differential - 40 c to 150 c [ - 40 f to 302 f] 10 75 140 g operating t emperature C - 40 [ - 40] C 150 [302] c [ f] storage t emperature C - 55 [ - 67] C 165 [329] c [ f] notice the magnetic field strength required t o 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 . ta ble 2 . ss345pt / s s445p absolute maximum ratings 1 characteristic minimum typical maximum unit supply voltage - 0.5 C 7 .0 v applied output voltage - 0.5 C 7 .0 v output current C C 8.0 ma magnetic flux C C no limit g note 1 : 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. ss345pt/SS445P current sinking output block diagram figure 2. typical ss345pt/SS445P magnetic performance vs temperature
honeywell sensing and control 3 f igure 3 . ss345pt mounting /t ape and reel dimensions (for reference only. mm/[in]) figure 4 . SS445P mounting dimensions (for reference only. mm/[in])
sensing and control honeywell 1 985 douglas drive north golden valley, mn 55422 www.honeywell.com/sensing 005921 - 1 - en il50 glo printed in usa december 2009 ? 2009 honeywell international inc. all rights reserved. o rder g uide catalog listing description ss345pt unipolar , hall - effect digital position sensor with built - in pull - up resistor , sot - 23 package , tape and reel packag ing (3000 units per reel) SS445P unipolar , hall - effect digital position sensor with built - in pull - up resistor , flat to - 92 package , bulk packag ing (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 these instructions could result in death or serious injury. w arranty/remedy honeywell warrants goods of its manufacture as being free of defect ive 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 warrante d 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 impli ed, 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 respo nsibility for its use. warning misuse of documentat ion the information presented in this product sheet is for reference only. d o 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 distributor, 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 - 8188 +1 - 305 - 883 - 8257 fax usa/canada +1 - 800 - 537 - 6945 +1 - 815 - 235 - 6847 +1 - 815 - 235 - 6545 fax
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