OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Reflective Object Sensor
OPB608A, OPB608B, OPB608C, OPB608R, OPB608V
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 B 10/2010
Page 1 of 5
Description:
OPB608 reflective switches consist of an infrared emitting device (LED or VCSEL) and a NPN silicon
phototransistor mounted “side-by-side” on a parallel axis in a black opaque plastic housing. All OPB608’s (except
OPB608R) have an emitting device and a phototransistor that are encapsulated in a visible filtering epoxy. The
phototransistor responds to radiation from the emitter only when a reflective object passes within its field of view.
The phototransistor has enhanced low current roll-off to improve the contrast ratio and immunity to background
irradiance. LED versions are designed for near-field applications. The VCSEL version is designed for longer
distances.
OPB608A, OPB608B and OPB608C devices are designed for applications with reflective distances between
0.050” (1.270 mm) and 0.375” (9.525 mm). OPB608V is designed for applications with reflective distances
between 0.050” (1.270 mm) and 1.200” (30.480 mm). All of these are designed for light patterns not visible to the
human eye. By utilizing the night enhancement function of a camera, the near infrared light pattern can be seen.
This allows a user to see the pattern shining on the reflective object.
OPB608R is designed for applications with reflective distances between 0.050” (1.270 mm) and 0.300” (7.620
mm). It is designed for light patterns visible to the human eye. The efficiency of this sensor is lower for optical
wavelengths in the visible range, thus reducing the distance that can be used.
Reflective distances are dependent upon the drive current for the light emitting device, the wavelength of the light
source, and the type of reflective material; therefore, each application should be checked for the ability to meet
each requirement.
Custom electrical, wire and cabling and connectors are available. Contact your local representative or OPTEK for
more information.
Features:
• Phototransistor output
• Unfocused for sensing diffuse surface
• Low cost plastic housing
• Enhanced signal to noise ratio
• Reduced ambient light sensitivity
Product Photo Here
Additional laser safety information can be found
on the Optek website. See application #221.
Classification is not marked on the device due to
space limitations. See package outline for
centerline of optical radiance. Operating de-
vices beyond maximum rating may cause de-
vices to exceed rated classification
Applications:
• Non-contact reflective object
sensor
• Assembly line automation
• Machine automation
• Machine safety
• End of travel sensor
• Door sensor
Ordering Information
Part
Number LED Peak
Wavelength
Sensor Reflection Distance
Inch (mm) Lead
Length
OPB608A
890 nm
Rbe Transistor See Graph
on Page 4
OPB608B
OPB608C
OPB608R 650 nm
OPB608V 850 nm
0.18"
(Min)
RoHS
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Reflective Object Sensor
OPB608A, OPB608B, OPB608C, OPB608R, OPB608V
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 B 10/2010
Page 2 of 5
Notes:
(1) RMA flux is recommended. Duration can be extended to 10 seconds maximum when flow soldering.
(2) Methanol or isopropanol are recommended as cleaning agents. The plastic housing is soluble in chlorinated hydrocarbons and
keytones.
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Storage Temperature Range -40° C to +85° C
Operating Temperature Range OPB608 A, B, C & R
OPB608V
-40° C to +85° C
0° C to +70° C
Lead Soldering Temperature [1/16 inch (1.6mm) from the case for 5 sec. with soldering iron](1) 260° C
Total Power Dissipation 100 mW
OPB608A, OPB608B, OPB608C (Infrared-LED — 890 nm)
Forward DC Current 50 mA
Peak Forward Current (1 μs pulse width, 300 pps) 3 A
Reverse DC Voltage 2 V
OPB608R (Visible Red-LED — 650 nm)
Forward DC Current 50 mA
Reverse DC Voltage 5 V
OPB608V (Infrared-VCSEL — 850 nm)
Forward DC Current 12 mA
Reverse DC Voltage 5 V
Phototransistor
Collector-Emitter Voltage 30 V
Emitter Reverse Current 10 mA
Collector DC Current 25 mA
4 1
3 2
CONTAINS POLYSULFONE
To avoid stress cracking, we suggest using
ND Industries’ Vibra-Tite for thread-locking.
Vibra-Tite evaporates fast without causing
structural failure in OPTEK’s molded plastics.
DIMENSIONS ARE IN:
INCHES
[ MILLIMETERS]
Pin # LED Pin # Transistor
4 Cathode 1 Collector
3 Anode 2 Emitter
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Reflective Object Sensor
OPB608A, OPB608B, OPB608C, OPB608R, OPB608V
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 B 10/2010
Page 3 of 5
Notes:
(1) Distance from the front of the lens to reflective surface.
(2) Measured using Eastman Kodak gray card. The white side of the card is used as a 90% diffuse reflective surface. Reference
Eastman Kodak catalog #E152 7795
(3) All parameters are tested using pulse techniques.
Electrical Characteristics (TA = 25°C unless otherwise noted)
SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS
Infrared-LED (880 nm) (See OP240 for additional information)
VF Forward Voltage - - 1.7 V IF = 20 mA
IR Reverse Current - - 100 µA VR = 2 V
Infrared-LED (650 nm)
VF Forward Voltage - 1.9 2.5 V IF = 20 mA
VR Reverse Voltage 5 - - V IR = 10 µA
Infrared VCSEL (850 nm) (See OPV330 for additional information)
VF Forward Voltage - - 2.2 V IF = 12 mA
IR Reverse Current - - 30 nA VR = 5 V
ITH Threshold Current 2 - 5.5 mA -
Θ Beam Divergence - 12 - Deg. IF = 12 mA
Phototransistor (See OP705 for additional information)
V (BR)CEO Collector Emitter Breakdown Voltage 30 - - V IC = 100 µA, EE = 0 µW/cm2
V (BR)ECO Emitter Collector Breakdown Voltage 0.4 - - V IE = 100 µA, EE = 0 µW/cm2
VCE(SAT) Saturation Voltage - - .40 V IC = 100 µA, IF = 20 mA, d = 0.053”
ICEO Collector Emitter Dark Current - - 100 nA VCE = 5 V, EE = ≤ .10 µW/cm2, IF = 0
Combined
IC(ON)
On-State Collector Current
OPB608A
OPB608B
OPB608C
OPB608R
2
1
0.5
1
-
-
-
-
-
4
-
6
VCE = 5 V, IF = 20 mA, d = 0.053 inch
(1.35 mm)(1)(2)
OPB608V 5 - - VCE = 5 V, IF = 10 mA, d = 0.053 inch
(1.35 mm)(1)(2)
IC(OFF)
Off-State Collector Current
LED
VCSEL
-
-
-
-
100
100
nA
No reflective surface, VCE = 5 V
IF = 20 mA
IF = 10 mA
mA
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Reflective Object Sensor
OPB608A, OPB608B, OPB608C, OPB608R, OPB608V
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 B 10/2010
Page 4 of 5
Kodak 90% Card Normalized Output vs
O bj ect Di st ance
0.00
0.01
0.10
1.00
10.00
100.00
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Object Distance (inches)
Normalized Output
OPB608
OPB608R
OPB608V
N o rmalized with OPB 608 Kodak 90% at 0.05"
Test ing Condit ion:
VC E = 5 Vo l t s
IF = 20mA ( OPB608
and OPB608R)
IF = 10mA (OPB608V)
Collector Current vs Diode F orward Current
0
1
1
2
2
3
3
4
4
5
5
0 1020304050
I
F
- Forward Current - mA
I
C(ON)
- Typical Collector Current - mA
OPB608R
OPB608V
OPB608
V ce = 5 Vo lt s
St and ard Test Co nd it io ns
Normalized for OPB608 @ 20mA
Col l ector Curre nt vs Am bient Te m p.
0%
20%
40%
60%
80%
100%
120%
140%
-40-30-20-100 102030405060708090
Ta - Ambient Temperatu re - °C
Normalized Collector Current (%)
OPB608R
OPB608
OPB608V
No r malized at 2 5°C f o r each
product type
V ce = 5 Vo lt s
I
F
= 20 mA (OPB608
and OPB 6 0 8 R)
I
F
= 10 mA (OPB608V)
Distance = 0.053"
Ri se an d Fal l vs L oad Resi stance
0
20
40
60
80
100
120
140
160
180
0 1000 2000 3000 4000 5000
RL - Load resistance - Ohms
Tr,Tf - Switching Speed - µsec
OPB 6 0 8R - Tr
OPB 6 0 8R - Tf
OPB 6 0 8 - Tr
OPB 6 0 8 - Tf
OPB608V - Tr
OPB608V - Tf
10% Duty Cycle
1 ms Pulse Widt h
Vce = 5 Volt s
I
F
= 20 mA ( OPB608 and
OPB608R)
I
F
= 10 mA ( OPB608V)
Dist ance = 0.057"
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Reflective Object Sensor
OPB608A, OPB608B, OPB608C, OPB608R, OPB608V
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 B 10/2010
Page 5 of 5
OPB608 OPB608R
Black Thermal Pape r
Thermal Paper
0
200
400
600
800
1000
1200
Reflective Response
OPB608V OPB608 OPB608R
White Plastic
Silver Tape
0
500
1000
1500
2000
2500
3000
Reflective Response
Reflective Response
OPB608V OPB608 OPB608R
Copier 20% Black
Laser 20% Black
Laserjet 20% Black
Inkjet 20% Black
0
1000
2000
3000
4000
5000
6000
OPB608V OPB608 OPB608R
Inkjet Magenta
Inkjet Cyan
Inkjet Yellow
Inkjet Green
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Reflective Response
OPB608V OPB608 OPB608R
Gray 18%
White 90%
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Relative Response
OPB608V OPB608 OPB608R
Copier Black
Inkjet Black
Laserjet Black
0
10
20
30
40
50
60
70
80
90
100
Reflective Response
