Reflective Object Sensor

OPB608A, OPB608B, OPB608R, OPB608V

Obsolete (OPB608C)

© TT electronics plc

General Note

TT Electronics reserves the right to make changes in product specification without

notice or liability. All information is subject to TT Electronics’ own data and is

considered accurate at time of going to print.

TT Electronics | OPTEK Technology

2900 E. Plano Pkwy, Plano, TX 75074 | Ph: +1 972 323 2200

www.ttelectronics.com | sensors@ttelectronics.com

Rev F 05/2022 Page 1

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 and OPB608B 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.

Applications:

• Non-contact reflective object sensor

• Assembly line automation

• Machine automation

• Machine safety

• End of travel sensor

• Door sensor

Features:

• Phototransistor output

• Unfocused for sensing diffuse surface

• Low cost plastic housing

• Enhanced signal to noise ratio

• Reduced ambient light sensitivity

Ordering Information

Part

Number

LED Peak

Wavelength

Sensor

Reflection Distance

Inch (mm)

Lead

Length

OPB608A

890 nm

Rbe Transistor

See Graph

on Page 4

0.18"

(Min)

OPB608B

OPB608C

(Obsolete)

OPB608R

660 nm

OPB608V

850 nm

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 opti-

cal radiance. Operating devices beyond maximum

rating may cause devices to exceed rated classification.