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) Product Photo Here 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: Ordering Information Non-contact slotted magnetic switch Part Number Description Harsh environment encoder OHB900 Slotted Switch Assembly line automation Machine automation Machine safety End of travel sensor Door sensor 1Vcc Voltage Regulator Output Hall 3 Element MILLIMETERS DIMENSIONS ARE IN: INCHES Pin Description 2 Ground 1 Vcc 2 Ground 3 Output OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible. RoHS OPTEK Technology Inc. 1645 Wallace Drive, Carrollton, Texas 75006 Issue B 03/2014 Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors optekinc.com www.optekinc.com Page 1 of 3 Hallogic Hall-effect Sensor Assembly OHB900 Absolute Maximum Ratings (TA = 25 C unless otherwise noted) Supply Voltage, V 25 V CC Storage Temperature Range, T -50C to +160 C S Operating Temperature Range, T -40C 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 (2) Electrical Characteristics (V = 4.5 V to 24 V, T = 25 C unless otherwise noted) CC 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 (1) I Output Leakage Current - 0.1 10 A V = 4.5 V, V = 24 V, Slot Blocked OH OUT t Output Rise Time - 0.21 1 s R = 820 , C = 20 pF r L L t Output Fall Time - 0.1 1 s R = 820 , 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 -0.127mm 0,08mm -1,27mm 0.12 1.27mm 7mm -0,08mm V OH Measurements are referenced to Center Line. 90% 90% 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 1.212.7m7mmm from Bottom of Slot U.U.T. 3 20 pf Ground 2 OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible. Issue B 03/2014 OPTEK Technology Inc. 1645 Wallace Drive, Carrollton, Texas 75006 Page 2 of 3 Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors optekinc.com www.optekinc.com