Product Bulletin OHB900 January 1996 (SP OPTEK Hallogic Hall Effect Sensor Assembly Type OHB900 +130 (3.30) 810 (20.57) +790 (20.07) "120 (2.05) 7 PLACES M g +260 (6.60) 240 (6.10) -550 (13.97) +530 (13.48) 1.03 (26.16) 260 (6.60) 1.01 (25.65) | -240 (6.10} HALL ELEMENT { .112 (2.84) 11S (2.92) -130 (3.30) > 39) NOM [120 (3.05) 135 (3.43) 110 (2.79) 1S (2.92) ] PT [| NC feo J-HALL ELEMENT 355 (3.02) = | t ws (1.08) PEE (1) Veo 1335 (8.51) JT ee Co -41S (10.543 | .250 MIN ye (2) GND rm | - (3) OUTPUT MAGNETIC .105 (2.87) se) 60 ORTENTAT ION SSS 015 (0,38) -183 (4.65) TYP 055 (1.40) 2045 (1.14) PL DIMENSIONS ARE IN INCHES (MILLIMETERS) Features Non-contact motion sensing Operates over a broad range of supply voltages Excellent temperature stability Hall element, linear amplifier, and Schmitt trigger on a single Hallogic silicon chip e Performs in high dust and dirt environments 0.125" (3.18mm) 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, reducing 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. Absolute Maximum Ratings (Ta = 25 C unless otherwise noted) Supply Voltage, Voc... cece cece eee nen tence evecnenee. 25V Storage Temperature Range, Ts............. 00 cece eee. -50 C to +160 C Operating Temperature Range, Ta .... 0... c cece eee e cece ee -50 C to +150C Lead Soldering Temperature [1/8 inch (3.2 mm) from case for 5 sec. with soldering oe) 260 C Output ON Current, ISINK .. 2... 6c cece ce cece cece eceececccccce. 25 mA Output OFF Voltage, VOUT... 0. e cece eee eneneeeccesecs 25V Magnetic Flux Density, B... 6... ccc cece cece ee ceeeees Unlimited Sensor Functional Block Diagram MAGNET Voc 7 REG. OUTPUT GROUND b Optek Technology, Inc. 1215 W. Crosby Road Carrollton, Texas 75006 10-10 (972) 323-2200 Fax (972) 323-2396Type OHB900 Electrical Characteristics (Vcc = 4.5 V to 24 V, TA= 25 C unless otherwise noted) Symbol Parameter Min | Typ | Max | Units Test Conditions lec Supply Current 4 7 mA |Vcc = 24 V, Output Off VoL Output Saturation Voltage 100 | 400 mV {Vcc = 4.5 V, lo. = 20 mA, Slot Open loH | Output Leakage Current 0.1 | 10.0] pA |Vco=4.5V, Vout = 24 V, Slot Blocked! tr Output Rise Time 0.21 | 1.00 ps : Ri = 820 Q, CL = 20 pF tt Output Fall Time 0.25 | 1.00 us (1) Slot blocked with a ferrous material to interrupt magnetic flux. Typical Performance Curves Optek reserves the right to make changes at any time in order to improve design and to supply the best product possible. Optek Technology, Inc. 1215 W. Crosby Road Carrollton, Texas 75006 10-11 (972)323-2200 Fax (972)323-2396 kK oO we i. 1s ive] - a 4 x _ SENSORS