Magnetoresistive Sensor ICs Nanopower Series Datasheet
Magnetoresistive Sensor ICs Honeywell’s Nanopower Series Magnetoresistive (MR) Sensor ICs are ultra-sensitive devices designed to accommodate a wide range of applications with large air gaps, small magnetic fields and low power requirements. The sensor ICs 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.
Magnetoresistive Sensor ICs, Nanopower Series Table 1A. Electrical Specifications (Vs = 1.65 V to 5.5 V, Ta = -40 °C to 85 °C [-40 °F to 185 °F], Typ. at 1.8 V, 25 °C [77 °F] unless otherwise specified.) Characteristic Condition Min. Typ. Max. Unit Vs reference to ground 1.65 1.8 5.5 V Awake current: SM351LT SM353LT — — 0.3 1 0.8 5 5 mA Awake time — — 15 — µs — Vs = 1.65 V Vs = 1.8 V Vs = 5.5 Vdc — — — — 0.2 0.16 0.2 2.6 8 0.
Magnetoresistive Sensor ICs, Nanopower Series Table 2. Magnetic Specifications (Vs = 1.65 V to 5.5 V, Ta = -40 °C to 85 °C [-40 °F to 185 °F].) Characteristic Min. Typ. Max. SM351LT: operate (positive) release (positive) hysteresis 3 2 7 5 2 11 — — SM353LT: operate (positive) release (positive) hysteresis 6 3 14 10 4 20 — — * * Unit Gauss Gauss *At 1.65 V and -40 °C, the hysteresis can reach 0.1 Gauss.
Magnetoresistive Sensor ICs, Nanopower Series Figure 2. Alignment of the Magnet to the Omnipolar Magnetoresistive Sensor IC Ideal alignment: The magnet is aligned in the same plane as the sensor IC. Figure 2.A The magnetic flux lines stay horizontal as the magnet approaches the sensor IC (see Figure 2.A). SM351LT, SM353LT Sensor IC Magnet Magnet movement Offset alignment: The magnet is not aligned in the same plane as the sensor IC. Parallel magnet approach to the sensor IC may cause dead zones.
Magnetoresistive Sensor ICs, Nanopower Series Figure 3. SM351LT Typical Performance Characteristics Magnetic Performance vs Temperature (Vs = 1.8 V) Period vs Temperature 180 160 10 140 8 1.65 Vdc Supply 120 Operate Point Time (ms) Magnetic Switch Point (Gauss) 12 6 100 Release Point 4 1.80 Vdc Supply 80 60 5.50 Vdc Supply 40 2 20 0 0 -40 -20 0 20 40 60 80 -40 -20 0 Temperature (°C) Average Current vs Temperature 3.5 40 60 80 Active Mode Time vs Temperature 25 5.
Magnetoresistive Sensor ICs, Nanopower Series Figure 5. Mounting and Tape/Reel Dimensions (For reference only. mm/[in].) e Sensor Sensor Showing Polarity 2,90 [0.114] 3 GND (-) 2,80 [0.110] Nominal to IC center 16 or 1,60 [0.063] 61 1 VCC (+) 2 OUTPUT 3X 0,40 TYP. [0.016] 0,95 [0.037] 1,90 [0.075] 0,13 [0.005] Nominal to IC sensing surface 0,413 [0.016] 0,77 [0.030] 1,40 Max. 1,20 [0.047] [0.055] 0,60 [0.024] Tape 0,787 [0.031] 4,00 [0.157] 4,00 [0.157] 2,00 [0.079] 0,20 [0.
Table 4. Order Guide Catalog Listing Description SM351LT Magnetoresistive sensor IC, high sensitivity (7 G typ.), nanopower, SOT-23 package, tape and reel packaging (3000 units per reel) SM353LT Magnetoresistive sensor IC, high sensitivity (14 G typ.), nanopower, SOT-23 package, tape and reel packaging (3000 units per reel) ADDITIONAL INFORMATION The following associated literature is available at sensing.honeywell.
