SM351RT

Magnetoresistive Sensor ICs Standard Power Series: SM351RT, SM451R, SM353RT, SM453R 32304118 Issue C Datasheet SM451R SM453R SM351RT SM353RT DESCRIPTION Honeywell’s Magnetoresistive Sensor ICs (integrated circuits), Standard Power Series, are ultra-sensitive devices designed for manufacturers who need a durable and reliable speed or position sensor for large air gaps or small magnetic fields in standard power (typically 3 Vdc to 24 Vdc) applications. Unlike reed switches and other magnetic sensors, Honeywell’s solid state design offers ultra-high sensitivity of 11 G max., making it the highest sensitivity sensor in its class for standard powered applications. The Magnetoresistive Sensor ICs, Standard Power Series, 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. VALUE TO CUSTOMERS • Durable and reliable due to magnetic solid state, non-contact, no-glass design which enhance switching capability. • Cost-effective and flexible due to the sensor IC’s ultra-high sensitivity—the highest sensitivity sensor in its class for standard powered applications—which lowers the customer’s cost of magnets and simplifies design-in. • Simplifies design-in for wired applications due to its supply voltage range, omnipolar operation, SOT-23 and flat TO-92style package options and wide operating temperature range. DIFFERENTIATION • Ultra-high sensitivity (SM351RT and SM451R) allows for potential use in applications requiring ultra-high magnetic sensitivity (7 G typical operate, 11 G maximum operate). Sensing and Productivity Solutions FEATURES • Magnetic sensitivities: - Ultra-high sensitivity (SM351RT and SM451R): For 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] • SOT-23 supplied on tape and reel (3000 units per reel) • RoHS-compliant materials meet Directive 2002/95/EC POTENTIAL APPLICATIONS Industrial • High frequency flow sensing in HVAC, water, fuel meters, and gas utility meters • Anti-tamper detection in water, electric, and gas utility meters • Liquid level detection • Motor RPM sensing • In-cylinder position sensing Medical • RPM sensing in exercise and rehabilitation equipment • Magnetic interrupt in exercise and rehabilitation equipment • Absence/presence detection in infusion pumps • Position sensing of medication dispensing cabinet drawers • Incline position sensing in hospital beds White Goods • Lid, door and drawer position detection • Fluid flow detection • Liquid level detection PORTFOLIO Honeywell’s Standard Power Series join: • Magnetoresistive sensor ICs, including the Nanopower Series, 2SS52M Series, SS552MT Series • Hall-effect sensor ICs, including the SS351A, SS451A Magnetoresistive 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 Supply voltage (Vcc) Supply current: off on Condition Min. Typ. Max. Unit Vcc reference to ground 3 12 24 V — Vcc = 5 V, T = 25 °C [77 °F] Vcc = 5 V, T = 25 °C [77 °F — — 2.5 4 8 3.5 5 mA Vcc > 3 V — — 10 µs Vcc = 24, off — — 10 µA load current = 20 mA — — 500 mV Vcc = 5 V, R = 2 kOhm, C = 20 pF Vcc = 5 V, R = 2 kOhm, C = 20 pF — — — — 1.5 1.5 µs Start-up time Output leakage current Output saturation voltage Rise time Fall time Table 2. Magnetic Specifications (3 V < Vcc < 24 V, -40 °C < Ta < 85 °C [-40 °F < Ta < 185 °F].) Characteristic Min. Typ. Max. SM351RT, SM451R: operate (positive) release (positive) differential 3 2 — 7 4.8 2.2 11 9 — SM353RT, SM453R: operate (positive) release (positive) differential 6 3 — 14 9.3 5.7 20 18 — Unit Gauss Gauss NOTICE NOTICE 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. These magnetoresistive sensor ICs may have an initial output in either the ON or OFF state if powered up with an applied magnetic field in the differential zone (applied magnetic field >Brp and