Magnetoresistive Sensor ICs 32304118 Standard Power Series: SM351RT, SM451R, SM353RT, SM453R Issue C Datasheet FEATURES SM351RT Magnetic sensitivities: SM353RT SM451R - Ultra-high sensitivity (SM351RT and SM451R): For SM453R 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 DESCRIPTION SOT-23 supplied on tape and reel (3000 units per reel) Honeywells Magnetoresistive Sensor ICs (integrated circuits), RoHS-compliant materials meet Directive 2002/95/EC Standard Power Series, are ultra-sensitive devices designed for manufacturers who need a durable and reliable speed or POTENTIAL APPLICATIONS position sensor for large air gaps or small magnetic fields in Industrial standard power (typically 3 Vdc to 24 Vdc) applications. Unlike High frequency flow sensing in HVAC, water, fuel meters, reed switches and other magnetic sensors, Honeywells solid and gas utility meters state design offers ultra-high sensitivity of 11 G max., making it Anti-tamper detection in water, electric, and gas utility the highest sensitivity sensor in its class for standard powered meters applications. The Magnetoresistive Sensor ICs, Standard Power Liquid level detection Series, respond to either a North or South pole applied in a Motor RPM sensing direction parallel to the sensor. They do not require the magnet In-cylinder position sensing polarity to be identified, simplifying installation and potentially Medical reducing system cost. RPM sensing in exercise and rehabilitation equipment Magnetic interrupt in exercise and rehabilitation equipment VALUE TO CUSTOMERS Absence/presence detection in infusion pumps Durable and reliable due to magnetic solid state, non-contact, Position sensing of medication dispensing cabinet drawers no-glass design which enhance switching capability. Incline position sensing in hospital beds Cost-effective and flexible due to the sensor ICs ultra-high sensitivitythe highest sensitivity sensor in its class for White Goods standard powered applicationswhich lowers the customers Lid, door and drawer position detection cost of magnets and simplifies design-in. Fluid flow detection Simplifies design-in for wired applications due to its supply Liquid level detection voltage range, omnipolar operation, SOT-23 and flat TO-92- style package options and wide operating temperature range. PORTFOLIO Honeywells Standard Power Series join: DIFFERENTIATION Magnetoresistive sensor ICs, including the Nanopower Ultra-high sensitivity (SM351RT and SM451R) allows for Series, 2SS52M Series, SS552MT Series potential use in applications requiring ultra-high magnetic Hall-effect sensor ICs, including the SS351A, SS451A sensitivity (7 G typical operate, 11 G maximum operate). Sensing and Productivity SolutionsMagnetoresistive Sensor ICs Standard Power Series: SM351RT, SM451R, SM353RT, SM453R Table 1. Electrical Specifications (3 V < Vcc < 24 V, -40 C < Ta < 85 C -40 F < Ta < 185 F unless otherwise specified.) CCharacteristic Condition Min. Typ. Max. Unit Supply voltage (Vcc) Vcc reference to ground 3 12 24 V Supply current: 8 off Vcc = 5 V, T = 25 C 77 F 2.5 3.5 mA on Vcc = 5 V, T = 25 C 77 F 4 5 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 Vcc = 5 V, R = 2 kOhm, C = 20 pF 1.5 s Fall time Vcc = 5 V, R = 2 kOhm, C = 20 pF 1.5 Table 2. Magnetic Specifications (3 V < Vcc < 24 V, -40 C < Ta < 85 C -40 F < Ta < 185 F .) Characteristic Min. Typ. Max. Unit SM351RT, SM451R: operate (positive) 3 7 11 Gauss release (positive) 2 4.8 9 differential 2.2 SM353RT, SM453R: operate (positive) 6 14 20 Gauss release (positive) 3 9.3 18 differential 5.7 NOTICE NOTICE The magnetic field strength (Gauss) required to cause the switch These magnetoresistive sensor ICs may have an initial output in to change state (operate and release) will be as specified in the either the ON or OFF state if powered up with an applied magnetic magnetic characteristics. To test the switch against the specified field in the differential zone (applied magnetic field >Brp and magnetic characteristics, the switch must be placed in a uniform <Bop). Honeywell recommends allowing 10 s for output voltage magnetic field. to stabilize after supply voltage has reached its final rated value. 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 ambient applied for < 10 s 245 473 C F SM451R, SM453R ambient applied for < 3 s 260 500 Supply voltage (Vs) -26 26 V Load current output sinking (open collector) 40 mA CAUTION NOTICE ELECTROSTATIC SENSITIVE Absolute maximum ratings are the extreme limits that the device will withstand without damage to the DEVICES device. However, the electrical and mechanical characteristics are not guaranteed as the maximum limits DO NOT OPEN OR HANDLE EXCEPT AT A STATIC FREE WORKSTATION (above recommended operating conditions) are approached, nor will the device necessarily operate at ESD SENSITIVITY: absolute maximum ratings. CLASS 3A Sensing and Productivity Solutions 2
