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. 165-1493
Mfr. Part No.KRB031
BrandKingbright
TWD31
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. 616-5686
Mfr. Part No.KRB031
BrandKingbright
TWD27
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. 666-6473
Mfr. Part No.GP1A51HRJ00F
BrandSharp
TWD57
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
New
RS Stock No. 178-1533
Mfr. Part No.GP1A51HRJ00F
BrandSharp
TWD54
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 880-1993
Mfr. Part No.OPB829CZ
BrandOptek
TWD156
Each (In a Pack of 2)
units
- 1 - - Screw Mount - 4 24.64 x 6.35 x 10.03mm 10.03mm 24.64mm +80°C -40°C 3.18mm 6.35mm
RS Stock No. 170-0952
Mfr. Part No.OPB829CZ
BrandOptek
TWD174
Each (In a Bag of 100)
units
- 1 - - Screw Mount - 4 24.64 x 6.35 x 10.03mm 10.03mm 24.64mm +80°C -40°C 3.18mm 6.35mm
RS Stock No. 908-7144
Mfr. Part No.OPB815WZ
BrandOptek
TWD170
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. 165-1495
Mfr. Part No.KRB011
BrandKingbright
TWD30
Each (On a Reel of 1500)
units
Phototransistor 1 8000ns 10000ns Surface Mount SMD 4 4 x 5 x 4mm 4mm 4mm +85°C -30°C 2mm 5mm
RS Stock No. 194-4030
Mfr. Part No.OPB815WZ
BrandOptek
TWD185
Each
units
Phototransistor 1 - - Chassis Mount PCB Module - - - - +80°C -40°C 9.53mm 9.53mm
RS Stock No. 616-5670
Mfr. Part No.KRB011
BrandKingbright
TWD34
Each (In a Pack of 5)
units
Phototransistor 1 8000ns 10000ns Surface Mount SMD 4 4 x 5 x 4mm 4mm 4mm +85°C -30°C 2mm 5mm
RS Stock No. 708-5556
Mfr. Part No.TCST2300
BrandVishay
TWD56
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. 919-0177
Mfr. Part No.TCST2300
BrandVishay
TWD34
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. 908-7217
Mfr. Part No.OPB943W51Z
BrandOptek
TWD182
Each
units
Transistor - 70ns 70ns Panel Mount Wire - 23.75 x 12.95 x 10.54mm 10.54mm 23.75mm +70°C -40°C 3.18mm 12.95mm
New
RS Stock No. 178-5045
Mfr. Part No.GP1S52VJ000F
BrandSharp
TWD26
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 453-0836
Mfr. Part No.H21A3
BrandIsocom
TWD57
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. 708-5553
Mfr. Part No.TCST2103
BrandVishay
TWD35
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
TWD30
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. 666-6536
Mfr. Part No.GP1S52VJ000F
BrandSharp
TWD32
Each (In a Pack of 5)
units
Phototransistor 1 3µs 4µs Through Hole - 4 12.2 x 5 x 10mm 10mm 12.2mm +85°C -25°C 3mm 5mm
New
RS Stock No. 178-5082
Mfr. Part No.GP1S092HCPIF
BrandSharp
TWD14
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 666-6511
Mfr. Part No.GP1S092HCPIF
BrandSharp
TWD19
Each (In a Pack of 10)
units
Phototransistor 1 50µs 50µs Surface Mount SMD 4 2.6 x 4.5 x 2.9mm 2.9mm 2.6mm +85°C -25°C 2mm 4.5mm