Slotted Optical Switches

Slotted optical switches (also called opto switches) are devices that provide status indications (on or off) when light beams are interrupted in various types of instruments, systems and equipment.

The switches contain phototransistors, which are illuminated by infrared light from the LEDs. The illumination causes the phototransistors to conduct. If objects are then placed into the slots between the transistors and the LEDs, the interruption of the light beams causes the transistors to switch off.

Optical slotted switches may also house rotating discs with holes around the rims. These holes spin within the light paths of the switches to create on and off pulses and direct the speed of the spinning discs.

What are slotted optical switches used for?

Slotted optical switches are used in assembly line production systems, machine automation and machine safety indicators.

The switches are standard in computer peripherals like printers, where the projection images get interrupted when they reach the end of their travel.

Types of slotted optical switches

Slotted optical switches are classified by their output mechanisms (buffers, inverters, interrupters), mounting types (through hole, panel, surface) and the number of pins located on the switches.


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Description Price Output Device Number of Channels Typical Rise Time Typical Fall Time Mounting Type Package Type Number of Pins Dimensions Height Length Maximum Operating Temperature Minimum Operating Temperature Slot Width Width
RS Stock No. 455-0868
Mfr. Part No.OPB625
BrandOptek
£1.90
Each
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 30ns 30ns Through Hole - 5 5.58 x 10.16 x 9.52mm 9.52mm 5.58mm +100°C -40°C 4.83mm 10.16mm
RS Stock No. 170-0773
Mfr. Part No.OPB625
BrandOptek
£1.78
Each (In a Tube of 100)
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 30ns 30ns Through Hole - 5 5.58 x 10.16 x 9.52mm 9.52mm 5.58mm +100°C -40°C 4.83mm 10.16mm
RS Stock No. 301-8442
Mfr. Part No.OPB620
BrandOptek
£1.21
Each
Units
Phototransistor 1 - - Through Hole - 4 10.16 x 5.59 x 9.52mm 9.52mm 10.16mm +100°C -40°C 4.83mm 5.59mm
RS Stock No. 303-1192
Mfr. Part No.OPB365T55
BrandOptek
£2.73
Each
Units
Phototransistor 1 10µs - Screw Mount - 4 24.61 x 6.35 x 10.8mm 10.8mm 24.61mm +85°C -40°C 3.18mm 6.35mm
RS Stock No. 303-1192A
Mfr. Part No.OPB365T55
BrandOptek
£1.65
Each (In a Pack of 25)
Units
Phototransistor 1 10µs - Screw Mount - 4 24.61 x 6.35 x 10.8mm 10.8mm 24.61mm +85°C -40°C 3.18mm 6.35mm
RS Stock No. 908-7144
Mfr. Part No.OPB815WZ
BrandOptek
£3.36
Each
Units
Transistor - - - Free Hanging Wire - 31.75 x 3.18 x 14.1mm 14.1mm 31.75mm +80°C -40°C 9.53mm 3.18mm
RS Stock No. 194-4030
Mfr. Part No.OPB815WZ
BrandOptek
£3.62
Each
Units
Phototransistor 1 - - Chassis Mount PCB Module - - - - +80°C -40°C 9.53mm 9.53mm
RS Stock No. 219-2527
Mfr. Part No.EE-SX4070
BrandOmron
£1.85
Each
Units
Open Collector 1 - - Through Hole - 5 11 x 8 x 9.7mm 9.7mm 11mm +75°C -40°C 8mm 8mm
RS Stock No. 321-9291
Mfr. Part No.HOA 2005 001
BrandHoneywell
£8.37
Each
Units
Inverter, Open-Collector with 10K Pull-Up Resistor 1 60ns 15ns Screw Mount - 5 23.75 x 12.95 x 15.62mm 15.62mm 23.75mm +70°C -40°C 3.18mm 12.95mm
RS Stock No. 708-5553
Mfr. Part No.TCST2103
BrandVishay
£1.412
Each (In a Pack of 5)
Units
Phototransistor 1 10µs 8µs Through Hole - 4 24.5 x 6.3 x 11.1mm 11.1mm 24.5mm +85°C -55°C 3.1mm 6.3mm
RS Stock No. 919-0174
Mfr. Part No.TCST2103
BrandVishay
£0.941
Each (In a Tube of 85)
Units
Phototransistor 1 10 μ 8µs Through Hole - 4 24.5 x 6.3 x 11.1mm 11.1mm 24.5mm 85°C -55°C 3.1mm 6.3mm
RS Stock No. 170-0776
Mfr. Part No.OPB916BZ
BrandOptek
£3.665
Each (In a Bag of 25)
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 50ns 50ns Screw Mount - 5 30.73 x 6.48 x 19.3mm 19.3mm 30.73mm +80°C -40°C 5.08mm 6.48mm
RS Stock No. 455-0896
Mfr. Part No.OPB916BZ
BrandOptek
£4.03
Each
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 50ns 50ns Screw Mount - 5 30.73 x 6.48 x 19.3mm 19.3mm 30.73mm +80°C -40°C 5.08mm 6.48mm
RS Stock No. 173-0303
Mfr. Part No.OPB917BZ
BrandOptek
£4.997
Each (In a Box of 100)
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 50ns 50ns Through Hole - 5 30.73 x 6.35 x 25.65mm 25.65mm 30.73mm +85°C -40°C 5.08mm 6.35mm
RS Stock No. 455-0919
Mfr. Part No.OPB917BZ
BrandOptek
£7.42
Each
Units
Buffer, Open-Collector with 10K Pull-Up Resistor 1 50ns 50ns Through Hole - 5 30.73 x 6.35 x 25.65mm 25.65mm 30.73mm +85°C -40°C 5.08mm 6.35mm
RS Stock No. 908-7194
Mfr. Part No.OPB917BZ
BrandOptek
£4.19
Each
Units
Transistor - 50ns 50ns Free Hanging Wire - 30.73 x 6.35 x 25.65mm 25.65mm 30.73mm +80°C -40°C 5.08mm 6.35mm
RS Stock No. 124-6797
Mfr. Part No.RPI-441C1
BrandROHM
£0.319
Each (In a Pack of 15)
Units
Phototransistor 1 10µs 10µs Through Hole - 4 8 x 4.2 x 5.2mm 5.2mm 8mm +85°C -25°C 4mm 4.2mm
RS Stock No. 453-0836
Mfr. Part No.H21A3
BrandIsocom
£1.40
Each (In a Pack of 5)
Units
Phototransistor 1 8µs 50µs Screw Mount - 4 25.7 x 6.6 x 11.1mm 11.1mm 25.7mm +85°C -25°C 3mm 6.6mm
RS Stock No. 219-2561
Mfr. Part No.EE-SG3
BrandOmron
£4.65
Each
Units
Phototransistor 1 4000ns 4000ns Through Hole - 4 25.4 x 6.35 x 11.7mm 11.7mm 25.4mm +85°C -25°C 3.6mm 6.35mm
RS Stock No. 170-0765
Mfr. Part No.OPB815L
BrandOptek
£2.088
Each (In a Bag of 25)
Units
Phototransistor 1 - - Screw Mount - 4 32 x 6.6 x 14.35mm 14.35mm 32mm +80°C -40°C 9.53mm 6.6mm
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