Reflective Object Sensor
OPB608A, OPB608B, OPB608R, OPB608V
Obsolete (OPB608C)
Features:
• Phototransistor output
• Unfocused for sensing diffuse surface
• Low cost plasꢀc housing
• Enhanced signal to noise raꢀo
• Reduced ambient light sensiꢀvity
Description:
OPB608 reflecꢀve switches consist of an infrared emiꢂng device (LED or VCSEL) and a NPN silicon phototransistor mounted
“side-by-side” on a parallel axis in a black opaque plasꢀc housing. All OPB608’s (except OPB608R) have an emiꢂng device
and a phototransistor that are encapsulated in a visible filtering epoxy. The phototransistor responds to radiaꢀon from the
emiꢁer only when a reflecꢀve object passes within its field of view. The phototransistor has enhanced low current roll-off to
improve the contrast raꢀo and immunity to background irradiance. LED versions are designed for near-field applicaꢀons.
The VCSEL version is designed for longer distances.
OPB608A and OPB608B devices are designed for applicaꢀons with reflecꢀve distances between 0.050” (1.270 mm) and
0.375” (9.525 mm). OPB608V is designed for applicaꢀons with reflecꢀve distances between 0.050” (1.270 mm) and
1.200” (30.480 mm). All of these are designed for light paꢁerns not visible to the human eye. By uꢀlizing the night
enhancement funcꢀon of a camera, the near infrared light paꢁern can be seen. This allows a user to see the paꢁern shining
on the reflecꢀve object.
OPB608R is designed for applicaꢀons with reflecꢀve distances between 0.050” (1.270 mm) and 0.300” (7.620 mm). It is
designed for light paꢁerns visible to the human eye. The efficiency of this sensor is lower for opꢀcal wavelengths in the
visible range, thus reducing the distance that can be used.
Reflecꢀve distances are dependent upon the drive current for the light emiꢂng device, the wavelength of the light source,
and the type of reflecꢀve material; therefore, each applicaꢀon should be checked for the ability to meet each requirement.
Custom electrical, wire and cabling and connectors are available. Contact your local representaꢀve or OPTEK for more
informaꢀon.
Ordering Informaꢀon
Part
Number
LED Peak
Wavelength
Reflecꢀon Distance
Inch (mm)
Lead
Length
Sensor
Applications:
OPB608A
OPB608B
• Non-contact reflecꢀve object sensor
• Assembly line automaꢀon
• Machine automaꢀon
• Machine safety
• End of travel sensor
• Door sensor
890 nm
OPB608C
(Obsolete)
See Graph
on Page 4
0.18"
(Min)
Rbe Transistor
OPB608R
OPB608V
660 nm
850 nm
Addiꢀonal laser safety informaꢀon can be found on the
Optek website. See applicaꢀon #221.
Classificaꢀon is not marked on the device due to space
limitaꢀons. See package outline for centerline of opꢀ-
cal radiance. Operaꢀng devices beyond maximum
raꢀng may cause devices to exceed rated classificaꢀon.
General Note
TT Electronics | OPTEK Technology
2900 E. Plano Pkwy, Plano, TX 75074 | Ph: +1 972 323 2200
www.ꢁelectronics.com | sensors@ꢁelectronics.com
TT Electronics reserves the right to make changes in product specificaꢀon without
noꢀce or liability. All informaꢀon is subject to TT Electronics’ own data and is
considered accurate at ꢀme of going to print.
Rev F 05/2022 Page 1
© TT electronics plc
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