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

Long Distance Reflective Switch

OPB720A and OPB720B Series

OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.

Issue F.1

01/08

Page 1 of 5

Description:

The OPB720A and OPB720B Series reflective switches detects objects as far away as 12” (305 mm) using

standard 90% reflective material, and can detect objects as small as 0.08” (2 mm). The OPB720 series consist of

three standard reflective switching distances -06Z for typically 6” (152 mm), -12Z for typically 12” (305 mm) and

-30VZ for typically 30” (762 mm). The power supply voltage range of the OPB720A series is 10 to 30 volts while

the power supply voltage range for the OPB720B is 4 to 7 volts.

The OPA720A and OPB720B sensors are NOT affected by ambient light in most conditions. Ambient light

conditions are compensated by using a synchronous driver detection scheme.

This sensor has a logical output that switches from a high level with reflective target to a low level with no reflective

target. With the addition of hysteresis, the OPB720 series minimizes output switching oscillations. The type of

material used for the target is very dependent on the distance that can be achieved for the sensor. Taking this into

consideration, the OPB720 series can be used in either a reflective or interruptive mode. As an example, the

OPB720A-12Z can easily be used in a reflective mode for distances around 12” (305 mm) while when reflecting off

a retro-reflective target similar to 3M 3870 or Nippon Crystallite at distances around 85” (216 mm) the device

works well in the interruptive mode. See the included charts for typical distances with different reflective material

for other versions of the OPB720 series devices.

The OPB720 series has an open collector output transistor and power requirements are compatible with most

PLCs and TTL gates.

Features:

(Typical Maximum detection distance to be set at factory)

RoHS

Applications:

Electronics

Vcc

Output

Ground

Ordering Information

Part Number

Description

OPB720A-06Z

OPB720B-06Z

Maximum detection of 0.04” to 6” (1.0 mm to 152 mm)

39” (991 mm) lead length with 28 AWG wire, using white 90%

reflective paper

OPB720A-12Z

OPB720B-12Z

Maximum detection of 0.04” to 12” (1.0 mm to 305 mm)

39” (991 mm) lead length with 28 AWG wire, using white 90%

reflective paper

OPB720A-30VZ

OPB720B-30VZ

Maximum detection of 0.04” to 30” (1.0 mm to 762 mm)

39” (991 mm) lead length with 28 AWG wire, using white 90%

reflective paper

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

OPB720A-30VZ & OPB720B-30VZ ONLY