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. 194-4024
Mfr. Part No.OPB815L
BrandOptek
£2.30
Each
Units
Phototransistor 1 - - Screw Mount - 4 32 x 6.6 x 14.35mm 14.35mm 32mm +80°C -40°C 9.53mm 6.6mm
RS Stock No. 219-2511
Mfr. Part No.EE-SX1070
BrandOmron
£2.02
Each
Units
Phototransistor 1 4000ns 4000ns Through Hole - 4 17.7 x 6 x 10.7mm 10.7mm 17.7mm +95°C -25°C 8mm 6mm
RS Stock No. 219-2555
Mfr. Part No.EE-SX1042
BrandOmron
£2.10
Each
Units
Transistor 1 4000ns 4000ns Through Hole - 4 14 x 5 x 14.5mm 14.5mm 14mm +85°C -25°C 5mm 5mm
RS Stock No. 788-4962
Mfr. Part No.EE-SX4009-P1
BrandOmron
£3.87
Each (In a Pack of 2)
Units
Phototransistor 1 - - Screw Mount - 3 7 x 11 x 34mm 34mm 7mm +75°C -25°C 5mm 11mm
RS Stock No. 177-4905
Mfr. Part No.EE-SX4009-P1
BrandOmron
£2.095
Each (In a Box of 100)
Units
Phototransistor 1 - - Screw Mount - 3 7 x 11 x 34mm 34mm 7mm +75°C -25°C 5mm 11mm
RS Stock No. 666-6473
Mfr. Part No.GP1A51HRJ00F
BrandSharp
£1.598
Each (In a Pack of 5)
Units
Photologic, Pull Up 1 0.1µs 0.05µs Screw Mount - 5 18 x 12.2 x 10mm 10mm 18mm +85°C -25°C 3mm 12.2mm
RS Stock No. 178-1533
Mfr. Part No.GP1A51HRJ00F
BrandSharp
£0.831
Each (In a Bag of 100)
Units
Photologic, Pull Up 1 0.1µs 0.05µs Screw Mount - 5 18 x 12.2 x 10mm 10mm 18mm +85°C -25°C 3mm 12.2mm
RS Stock No. 171-3808
Mfr. Part No.OPB680
BrandOptek
£3.05
Each
Units
Phototransistor 1 - - Through Hole - 4 12.19 x 10.92 x 8.89mm 8.89mm 12.19mm +100°C -40°C - 10.92mm
RS Stock No. 908-7148
Mfr. Part No.OPB816Z
BrandOptek
£2.94
Each
Units
Transistor - - - Panel Mount Wire - 30.73 x 6.35 x 19.3mm 19.3mm 30.73mm +85°C -40°C 5.1mm 6.35mm
RS Stock No. 708-5538
Mfr. Part No.TCST1103
BrandVishay
£1.176
Each (In a Pack of 5)
Units
Phototransistor 1 10µs 8µs Through Hole - 4 11.9 x 6.3 x 11.1mm 11.1mm 11.9mm +85°C -55°C 3.1mm 6.3mm
RS Stock No. 908-7138
Mfr. Part No.OPB804
BrandOptek
£1.258
Each (In a Pack of 10)
Units
Transistor - - - Through Hole Pin 4 12.57 x 6.35 x 11.68mm 11.68mm 12.57mm +85°C -40°C 3.94mm 6.35mm
RS Stock No. 919-0165
Mfr. Part No.TCST1103
BrandVishay
£0.683
Each (In a Tube of 85)
Units
Phototransistor 1 10 μ 8µs Through Hole - 4 11.9 x 6.3 x 11.1mm 11.1mm 11.9mm 85°C -55°C 3.1mm 6.3mm
RS Stock No. 616-5686
Mfr. Part No.KRB031
BrandKingbright
£0.95
Each (In a Pack of 5)
Units
Phototransistor 1 8000ns 10000ns Surface Mount SMD 4 4 x 6 x 5mm 5mm 4mm +85°C -40°C 3mm 6mm
RS Stock No. 165-1493
Mfr. Part No.KRB031
BrandKingbright
£0.651
Each (On a Reel of 1000)
Units
Phototransistor 1 8000ns 10000ns Surface Mount SMD 4 4 x 6 x 5mm 5mm 4mm +85°C -40°C 3mm 6mm
RS Stock No. 455-0925
Mfr. Part No.SG211
BrandKodenshi
£1.756
Each (In a Pack of 5)
Units
Phototransistor 1 50µs 50µs Through Hole - 4 5 x 4 x 5.2mm 5.2mm 5mm +85°C -20°C 2mm 4mm
RS Stock No. 880-2003
Mfr. Part No.OPB830W55Z
BrandOptek
£3.53
Each
Units
Transistor 1 - - Screw Mount - 4 23.75 x 6.35 x 10.54mm 10.54mm 23.75mm +80°C -40°C 3.18mm 6.35mm
RS Stock No. 666-6530
Mfr. Part No.GP1S53J000F
BrandSharp
£1.01
Each (In a Pack of 5)
Units
Phototransistor 1 3µs 4µs Through Hole - 4 13.7 x 5.2 x 10mm 10mm 13.7mm +85°C -25°C 5mm 5.2mm
RS Stock No. 908-7132
Mfr. Part No.OPB810W51Z
BrandOptek
£2.81
Each
Units
Transistor - - - Panel Mount Wire - 30.99 x 6.35 x 15.63mm 15.63mm 30.99mm +80°C -40°C 9.53mm 6.35mm
RS Stock No. 169-0523
Mfr. Part No.RPI-579N1
BrandROHM
£0.399
Each (In a Bag of 1000)
Units
Phototransistor 1 10000ns 10000ns Through Hole - 4 13.8 x 6 x 10mm 10mm 13.8mm +85°C -25°C 5mm 6mm
RS Stock No. 700-3996
Mfr. Part No.RPI-579N1
BrandROHM
£0.695
Each (In a Pack of 2)
Units
Phototransistor 1 10000ns 10000ns Through Hole - 4 13.8 x 6 x 10mm 10mm 13.8mm +85°C -25°C 5mm 6mm
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