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OPTEK
OPTEK


OHB900

Hallogic Hall Effect Sensor Assembly



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OHB900 pdf
Hallogic Hall Effect Sensor Assembly
OHB900
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
Performs in high dust and dirt environments over a wide temperature range
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.
The Uni-Polar turns on with a (logic level “O”) with after a sufficient magnetic field from the south pole of a
magnet approached 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.
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Supply Voltage, Vcc
Storage Temperature Range, TS
Operating Temperature Range, TA
Lead Soldering Temperature (1/8 in. (3.2 mm) from case for 5 sec. with soldering iron)
Output ON Current, ISINK
Output OFF Voltage, VOUT
Magnetic Flux Density, B
25 V
-50°C to +160°C
-50°C to +150°C
260°C
25 mA
25 V
Unlimited
Magnet
1 Vcc
Voltage
Regulator
Hall
Element
Output
3
2 Ground
OPTEK Technology Inc.— 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (800) 341-4747 FAX: (972) 323– 2396 sensors@optekinc.com www.optekinc.com
Issue A 02/ 05
Page 1



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OHB900 pdf
Hallogic Hall Effect Sensor Assembly
OHB900
Electrical Characteristics (Vcc = 4.5 V to 24 V, TA = 25° C unless otherwise noted)
Symbol
Parameter
ICC Supply Current
VOL Output Saturation Voltage
IOH Output Leakage Current
tr Output Rise Time
tf Output Fall Time
Min Typ Max Units
Test Conditions
4 7 mA Vcc = 24 V, Output Off
100 400
0.1 10.0
0.21 1.00
0.10 1.00
mV Vcc = 4.5 V, IOL = 20 mA, Slot Open
µA Vcc = 4.5 V, VOUT = 24 V, Slot Blocked(1)
µs
µs RL = 820 , CL = 20 pF
(1) Slot blocked with a ferrous material to interrupt magnetic flux.
B OP
B RP
Rise & Fall Time vs Temperature
350
Magnetic Field
VOH 90%
VOL 10%
Tf
90%
Tr
10%
Minimum
Right
Operate
Point
0.073"
[1,85mm]
Right
Release
Point
Left
Release
Point
Left
Operate
Point
0.045"
-0.045"
-0.073"
[1,14mm] [-1,14mm] [-1,85mm]
Vcc 1
Ground 2
820 Ohm
U.U.T.
Output
3
20 pf
Maximum 0.003"
-0.005"
0.005"
-0.003"
[0,08mm] [-1,27mm] [1.27mm] [-0,08mm]
Measurements are referenced to Center Line.
ROP
RRP
MS
Center Line
LOP
LRP
Vane - Material = 1018 Cold Rolled Steel - 0.03" [0.76mm] Thick
Location = 0.50" [1.27mm] from Bottom of Slot
Icc vs Temperature
9.0
300
250
Rise Time
Fall Time
200
150
100
50
0
-40°C
0°C
40°C
80°C
Temperature (°C)
120°C
Saturation Voltage vs Temperature
0.40
150°C
8.0
0.35
7.0
Icc ON (mA)
RL = 820
Icc OFF (mA)
ohms
6.0 0.30
5.0
0.25
4.0
3.0 0.20
2.0
0.15
1.0
0.0
-40°C
Issue A 02/ 05
Page 2
0°C
40°C
80°C
120°C
150°C
Temperature (°C)
0.10
-40°C
0°C
40°C
80°C
120°C
150°C
Temperature (°C)
OPTEK Technology Inc.— 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (800) 341-4747 FAX: (972) 323– 2396 sensors@optekinc.com www.optekinc.com



Part Number OHB900
Description Hallogic Hall Effect Sensor Assembly
Maker OPTEK - OPTEK
Total Page 2 Pages
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