Hallogic Hall-Effect Sensor Assembly OHB900 Features:  Non-contact motion sensing  Operates over a broad range of supply voltages (4.5 V to 25 V)  Excellent temperature stability  Hall element, linear amplifier and Schmitt trigger on a single Hallogic silicon chip  Performs in dirty environments over wide temperature range  0.125” (3.18 mm) wide gap Description: The OHB900 consists of a Hall-effect sensor similar to the OH180U and a rare earth magnet mounted in a low-cost plastic housing. The magnet produces optimum magnetic flux at the Hall-effect sensor location. The sensor has an open collector transistor output, which is activated when the slot is open. When the slot is blocked by a ferrous material that reduces the magnetic flux density at the Hall-effect sensor location, the open collector output transistor switches off. The device provides up to 25 mA of sink current. Output characteristics are constant at switching frequencies from DC to over 200 kHz. The Uni-Polar turns on with a (logic level “0”) after a sufficient magnetic field from the south pole of a magnet approaches the symbolized face of the device (Operating Point) and turns off (logic level “1”) after the magnetic field reached a minimum value. This feature makes these sensors ideal for applications in non-contact switching operations. Applications:  Non-contact slotted magnetic switch  Harsh environment encoder Ordering Information  Assembly line automation  Machine automation Part Number Description  Machine safety OHB900 Slotted Switch  End of travel sensor  Door sensor 1 Vcc Voltage Regulator Output Hall 3 Element [MILLIMETERS] DIMENSIONS ARE IN: INCHES Pin # Description 2 Ground 1 Vcc 2 Ground 3 Output RoHS General Note TT Electronics | Optek Technology, Inc. TT Electronics reserves the right to make changes in product specification without 1645 Wallace Drive, Ste. 130, Carrollton, TX USA 75006 |Ph: +1 972 323 2200 notice or liability. All information is subject to TT Electronics’ own data and is www.ttelectronics.com | sensors@ttelectronics.com considered accurate at time of going to print. Issue B 11/2016 Page 1 © TT electronics plc Hallogic Hall-Effect Sensor Assembly Electrical Specifications Absolute Maximum Ratings (T = 25° C unless otherwise noted) A Supply Voltage, V 25 V CC Storage Temperature Range, T -50°C to +160° C S Operating Temperature Range, T -40°C to +150° C A Lead Soldering Temperature (1/8 in. (3.2 mm) from case for 5 sec. with soldering iron) 260° C Output ON Current, I 25 mA SINK Output OFF Voltage, V 25 V OUT Magnetic Flux Density, B Unlimited Electrical Characteristics (T = 25° C unless otherwise noted) A SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS I Supply Current - 4 7 mA V = 24 V, Output Off CC CC V Output Saturation Voltage - 100 400 mV V = 4.5 V, I = 20 mA, Slot Open OL CC OL V = 4.5 V, V = 24 V, Slot Blocked OUT I Output Leakage Current - 0.1 10 µA (1) OH t Output Rise Time - 0.21 1 µs R = 820 Ω, C = 20 pF r L L t Output Fall Time - 0.1 1 µs R = 820 Ω, C = 20 pF f L L Notes: (1) Slot blocked with a ferrous material to interrupt magnetic flux. (2) See Hall-effect data sheet OH090 through OHS3100 Series for additional information — for reference only. B B OP RP Right Right Left Left Operate Release Release Operate Point Point Point Point Magnetic Field Minimum 0.073" 0.045" -0.045" -0.073" [1,85mm] [1,14mm] [-1,14mm] [-1,85mm] Maximum 0.003" -0.005" 0.005" -0.003" -0.005” 0.005” [0,08mm] [- [-1,27mm] 0.127mm] [[1.27 0.127mm mm] ] [-0,08mm] V OH 90% 90% Measurements are referenced to Center Line. Tf Tr ROP RRP 10% 10% V OL Center Line M S 820 Ohm LOP LRP Vcc 1 Vane - Material = 1018 Cold Rolled Steel - 0.03" [0.76mm] Thick Output Location = 0.50" 0.50” [ [1 12.2 .77m mmm] ] from Bottom of Slot U.U.T. 3 20 pf Ground 2 General Note TT Electronics | Optek Technology, Inc. TT Electronics reserves the right to make changes in product specification without 1645 Wallace Drive, Ste. 130, Carrollton, TX USA 75006 |Ph: +1 972 323 2200 notice or liability. All information is subject to TT Electronics’ own data and is www.ttelectronics.com | sensors@ttelectronics.com considered accurate at time of going to print. Issue B 11/2016 Page 2 © TT electronics plc Hallogic Hall-Effect Sensor Assembly Performance Rise & Fall Time vs Temperature Icc vs Temperature Rise & Fall vs Temperature Icc vs Temperature 350 9 Icc ON Icc OFF 8 300 7 250 6 200 5 4 150 3 100 2 50 Rise 1 Fall 0 0 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 Temperature (°C) Temperature (°C) Saturation Voltage vs Temperature Saturation Voltage vs Temperature 0.4 Sat Voltage 0.35 0.3 0.25 0.2 0.15 0.1 -50 -25 0 25 50 75 100 125 150 Temperature (°C) General Note TT Electronics | Optek Technology, Inc. TT Electronics reserves the right to make changes in product specification without 1645 Wallace Drive, Ste. 130, Carrollton, TX USA 75006 |Ph: +1 972 323 2200 notice or liability. All information is subject to TT Electronics’ own data and is www.ttelectronics.com | sensors@ttelectronics.com considered accurate at time of going to print. Issue B 11/2016 Page 3 © TT electronics plc Typical Time (ns) Typical Saturation Voltage (V) Typical Icc (mA)