DESCRIPTION The SS351AT and SS451A sensors are small, versatile digital These sensors are available in two package styles. The Hall-effect devices that are operated by the magnetic field from SS351AT is available in the subminiature SOT-23 surface a permanent magnet or an electromagnet. They are designed mount package; the SS451A is available in the leaded, flat TO- to respond to a either a North pole or a South pole. 92-style package. The SS351AT’s small size requires less PC board space, allowing it to be used in smaller assemblies. Its These omnipolar sensors are sensitive and flexible devices 3 Vdc capability allows for use in low voltage applications, designed to meet a wide range of potential applications. The promoting energy efficiency. SS351AT and SS451A have a typical operating point of 85 G at 25 °C [77 °F]. Because they can be operated by a North The SS351AT is available on tape and reel (3000 units per pole or a South pole, they do not require the magnet polarity to reel); the SS451A is available in a bulk package (1000 units be identified, thus making the installation easier and potentially per bag). reducing the system cost. FEATURES POTENTIAL APPLICATIONS Subminiature package size (SS351AT) supplied on tape Commercial: and reel allows for a compact design with automated Speed and RPM (revolutions per minute) sensing in component placement, helping to reduce manufacturing fitness equipment costs Magnetic encoder for building access Simple activation from a North pole or a South pole and Damper or valve position control in HVAC (heating, sensitive magnetics make this omnipolar product suitable ventilation and air conditioning) equipment in a variety of potential motion control, lid closure Flow rate sensing in appliances and water softeners detection, and displacement sensing applications Printer head position sensing Low voltage 3 Vdc capability helps reduce power Industrial: consumption Flow rate sensing in industrial processes Built-in reverse polarity protection protects the device from Robotic control (cylinder position monitoring) potential damage during installation Float-based fluid level sensing Thermally balanced integrated circuit provides for stable Medical: operation over a wide temperature range of -40° to Displacement sensor in hospital beds and medical 150 °C [-40 °F to 302 °F] equipment RoHS-compliant materials meet Directive 2002/95/EC Medication bin monitor on portable drug carts

Table 1. SS351AT/SS451A Specifications (At Vs=3.0 Vdc to 24 Vdc, 20 mA load, TA = -40 °C to 150 °C [-40 °F to 257 °F]) Characteristic Condition Minimum Typical Maximum Unit Supply voltage1: SS451A -40 °C to 150 °C [-40 °F to 302 °F] 3 – 24 Vdc SS351AT -40 °C to 125 °C [-40 °F to 257 °F] 3 – 24 SS351AT 150 °C [302 °F] 3 – 12 Supply current Vsupply = 5 V at 25 °C [77 °F] – 4.5 6 Vsupply = 3 V at 25 °C [77 °F] – 3.5 5 mA – – 9 Output Current – – – 20.0 mA Vsat at 20 mA, gauss > Bop positive – – 0.4 V or gauss < Bop negative Output leakage current gauss > Bop+ or < Bop- – – 10 µA Output switching time: Vsupply = 12 V at 25 °C [77 °F], rise – – 1.5 µs R =1.6 KOhm, C = 20 pF fall L L – – 1.5 Thermal resistance: SS451A – – 233 – °C/W SS351AT – 303 – SS351AT/SS451A: Operate positive – 35 85 135 gauss Operate negative -135 -85 -35 SS351AT/SS451A: Release positive – 10 50 120 gauss Release negative -120 -50 -10 SS351AT/SS451A gauss Differential – 5 35 80 Operating temperature – -40 [-40] – 150 [302] °C [°F] Storage temperature – -40 [-40] – 150 [302] °C [°F] Note 1: See Figure 1. Table 2. SS351AT/SS451A Absolute Maximum Ratings1 Characteristic Minimum Typical Maximum Unit Supply voltage -28.0 – 28.0 V Applied output voltage -0.5 – 28.0 V Output current – – 20 mA Magnetic flux – – 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 characteristics, 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 guaranteed 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 2 www.honeywell.com/sensing

Figure 3. Typical SS351AT/SS451A Magnetic Performance vs Temperature Figure 4. Wiring Diagrams Figure 5. SS351AT Mounting/Tape and Reel Dimensions (For reference only. mm/[in]) Honeywell Sensing and Control 3

Figure 6. SS451A Mounting Dimensions (For reference only. mm/[in]) Order Guide 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-92 package, bulk packaging (1000 units per bag) WARNING WARNING PERSONAL INJURY MISUSE OF DOCUMENTATION DO NOT USE these products as safety or emergency stop The information presented in this product sheet is for devices or in any other application where failure of the reference only. DO NOT USE this document as a product could result in personal injury. product installation guide. Failure to comply with these instructions could result Complete installation, operation, and maintenance in death or serious injury. information is provided in the instructions supplied with each product. Failure to comply with these instructions could result WARRANTY/REMEDY in death or serious injury. 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 SALES AND SERVICE by Honeywell in writing; please refer to your order Honeywell serves its customers through a worldwide network acknowledgement or consult your local sales office for specific of sales offices, representatives and distributors. For warranty details. If warranted goods are returned to Honeywell application assistance, current specifications, pricing or name during the period of coverage, Honeywell will repair or replace, of the nearest Authorized Distributor, contact your local sales at its option, without charge those items it finds defective. The office or: foregoing is buyer’s sole remedy and is in lieu of all other warranties, expressed or implied, including those of E-mail: info.sc@honeywell.com merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, Internet: www.honeywell.com/sensing or indirect damages. Phone and Fax: While we provide application assistance personally, through Asia Pacific +65 6355-2828 our literature and the Honeywell web site, it is up to the +65 6445-3033 Fax customer to determine the suitability of the product in the Europe +44 (0) 1698 481481 application. +44 (0) 1698 481676 Fax Latin America +1-305-805-8188 Specifications may change without notice. The information we +1-305-883-8257 Fax supply is believed to be accurate and reliable as of this USA/Canada +1-800-537-6945 printing. However, we assume no responsibility for its use. +1-815-235-6847 +1-815-235-6545 Fax Sensing and Control Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 005917-1-EN IL50 GLO Printed in USA November 2009 www.honeywell.com/sensing © 2009 Honeywell International Inc. All rights reserved.

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: H oneywell: SS351AT SS451A