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. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue C 08/2011
Page 1 of 3
Long Distance Reflective Switch
OPB732, OPB732WZ
3
4
2
1
OPB732
Description:
OPB732 uses an Infrared LED and Phototransistor in a reflective switch configuration. The assembly is offered
with either PCBoard through hole pins (OPB732) or 24” (610 mm), 26 AWG wires (OPB732WZ), and uses an
opaque housing to reduce the sensor’s ambient light sensitivity. The emitter and sensor are protected by a clear
window, providing a device that can operate in a dusty environment. The phototransistor can be configured as a
Common Collector or Common Emitter device.
While an object is in the reflective path of the device, light from the LED will be reflected back to the housing
irradiating the surface (base) of the phototransistor. When Infrared light strikes the phototransistor, the transistor
becomes forward biased and is considered to be in the “ON” state, providing an IC(ON) current proportional to the
light striking the phototransistor. With the Infrared light from the LED not being reflected to the phototransistor, the
phototransistor turns “OFF,” minimizing the IC(ON) current.
Custom electrical, wire and cabling and connectors are available. Contact your local representative or OPTEK for
more information.
Features:
• PC board mounting (OPB732)
• 24” (610 mm) 26 AWG wired with mounting tabs (OPB732WZ)
• Non-contact infrared switch
• Up to 1” or more reflective distance depending on circuitry
OPB732WZ
OPB732
Ordering Information
Part
Number LED Peak
Wavelength Lead Length / Spacing
OPB732 850 nm 0.150”/ see diagram
OPB732WZ 24" / 26 AWG Wire
Applications:
• Non-contact reflective object sensor
• Assembly line automation
• Machine automation
• Equipment security
• Door sensor
• Machine safety
• End of travel sensor
DIMENSIONS ARE IN:
INCHES
[ MILLIMETERS]
OPB732WZ
Pin # LED
Green-1 Emitter
White-2 Collector
Red-3 Anode
Black-4 Cathode
RoHS
[7.62]
.300
MIN.
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. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue C 08/2011
Page 2 of 3
Long Distance Reflective Switch
OPB732, OPB732WZ
Electrical Characteristics (TA = 25°C unless otherwise noted)
Notes:
(1) All parameters tested using pulse technique.
(2) RMA flux is recommended. Duration can be extended to 10 seconds maximum when flow soldering.
(3) Methanol or isopropanol are recommended as cleaning agents. The plastic housing is soluble in
chlorinated hydrocarbons and keytones.
(4) Distance = 1” (from front of package to a 90% diffuse reflective white card)
Absolute Maximum Ratings (TA = 25o C unless otherwise noted)
Storage Temperature -40° C to +100° C
Lead Soldering Temperature (1/16” (1.6mm) from case for 5 seconds with soldering iron)(2) 260° C
Operating Temperature -40° C to +85° C
SYMBOL PARAMETER MIN TYP MAX UNITS CONDITIONS
Input LED (See OP265 for additional information, reference only)
VF Forward Voltage - - 1.8 V IF = 20 mA
IR Reverse Current - - 100 μA VR = 2 V
Output Phototransistor (See OP505 for additional information, reference only)
V(BR)CEO Collector-Emitter Breakdown Voltage 30 - - V IC = 100 µA, EE = 0 mw/cm2
ICEO Collector-Emitter Dark Current - - 100 nA VCE = 10 V, EE = 0 mw/cm2
Coupled
VCE(SAT) Collector-Emitter Saturation Voltage(4) - - 0.4 V IC = 250 µA, IF = 30 mA , (4)
IC(ON) On-State Collector Current(4) 0.25 - - mA VCE = 1 V, IF = 30 mA, (4)
ICX Cross Talk - - 50 µA
VCE = 5 V, IF = 30 mA,
No reflective surface
Collector-Emitter Voltage 30 V
Collector DC Current 50 mA
Power Dissipation 100 mW
LED
Output Photo Transistor
Forward Current 50 mA
Power Dissipation 100 mW
Reverse DC Voltage 3 V
Peak Forward current (2 μs pulse width, 0.1% Duty Cycle) 1 A
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. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue C 08/2011
Page 3 of 3
Long Distance Reflective Switch
OPB732, OPB732WZ
Inverted
Output
Light
Drive
Ckt. Drive
Ckt.
Light
Output
R
Light
D
Output
RL
Light
Output
Inverted
RL
D
R
D
RR
LRD
RL
DD
I
CC
RV
=LED
- V
L
LI
CC
RV
=CE
- V
L
RCECC
=L
I
- VVLEDCC
R=
DD
I
V- V - V
CE
VCC CC
V
CC
V
CC
V
EE
V(GND) EE
V(GND)
EE
V(GND)
EE
V(GND)
I
LL
R- VV
=CC CE
ID
D- V
RV
=CC LED
L
RI
=L
- V
CC
VCE
- V
I
D=
R
D
CC
V- V
LED CE
Pulsed - Driver Circuits for LED & Phototransistor
DC—Drive Circuit for LED & Phototr ansistor
Pulsed—Drive Circuit for LED & Phototransistor
I
C(ON)
vs Distance (I
F
=30mA)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Distance (inches)
Norm alized I
C(ON)
Normalized at 1.00 inches
IC(ON) vs Distance (IF=30mA)
