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. 161-2144
Mfr. Part No.TCUT1600X01
BrandVishay
TWD68.00
Each (In a Pack of 5)
units
Transistor 2 9µs 16µs Surface Mount SMD 6 5.5 x 4 x 5.7mm 5.7mm 5.5mm 105°C -40°C - 4mm
RS Stock No. 183-7473
Mfr. Part No.EESX1340
BrandOmron
TWD42.10
Each (In a Pack of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 708-5538
Mfr. Part No.TCST1103
BrandVishay
TWD51.20
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. 183-7482
Mfr. Part No.EESX3081
BrandOmron
TWD74.00
Each (In a Pack of 200)
units
- - - - - - - - - - - - - -
RS Stock No. 124-6793
Mfr. Part No.RPI-243
BrandROHM
TWD39.70
Each (In a Pack of 10)
units
Phototransistor 1 10µs 10µs Through Hole - 4 5 x 4.2 x 5.2mm 5.2mm 5mm +85°C -25°C 2mm 4.2mm
RS Stock No. 169-0523
Mfr. Part No.RPI-579N1
BrandROHM
TWD18.30
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. 174-2530
Mfr. Part No.TCUT1800X01
BrandVishay
TWD106.80
Each (In a Pack of 5)
units
Phototransistor 4 9µs 16µs Surface Mount SMD 10 5.7 x 5.9 x 7.1mm 7.1mm 5.7mm +105°C -40°C 3mm 5.9mm
RS Stock No. 177-4908
Mfr. Part No.EE-SX1046
BrandOmron
TWD96.40
Each (In a Bag of 250)
units
Phototransistor 1 4µs 4µs Through Hole - 4 - 6.5mm 10mm +85°C -25°C 3mm -
RS Stock No. 908-7264
Mfr. Part No.OPB993T51Z
BrandOptek
TWD176.00
Each
units
Transistor - 70ns 70ns Panel Mount Wire - 24.63 x 6.35 x 15.63mm 15.63mm 24.63mm +70°C -40°C 3.18mm 6.35mm
RS Stock No. 219-2511
Mfr. Part No.EE-SX1070
BrandOmron
TWD88.00
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. 821-0123
Mfr. Part No.EE-SX671P
BrandOmron
TWD810.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 455-0880
Mfr. Part No.OPB830L51
BrandOptek
TWD93.00
Each
units
Phototransistor 1 - - Screw Mount - 4 23.75 x 12.95 x 10.54mm 10.54mm 23.75mm +85°C -40°C 3.18mm 12.95mm
RS Stock No. 880-2025
Mfr. Part No.OPB880P51Z
BrandOptek
TWD155.00
Each
units
- 1 - - Screw Mount - 4 18.47 x 6.35 x 15.75mm 15.75mm 18.47mm +85°C -40°C 3.3mm 6.35mm
RS Stock No. 880-2006
Mfr. Part No.OPB830W11Z
BrandOptek
TWD187.00
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. 177-4907
Mfr. Part No.EE-SX1081
BrandOmron
TWD65.30
Each (In a Box of 200)
units
Phototransistor 1 4µs 4µs Through Hole - 4 13.7 x 5 x 10mm 10mm 13.7mm +85°C -25°C 5mm 5mm
RS Stock No. 908-7258
Mfr. Part No.OPB991P51Z
BrandOptek
TWD175.00
Each
units
Transistor - 70ns 70ns Panel Mount Wire - 18.47 x 6.35 x 15.63mm 15.63mm 18.47mm +70°C -40°C 3.18mm 6.35mm
RS Stock No. 2509036020
Mfr. Part No.EE-SJ3-D
BrandOmron
TWD232.00
Each
units
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RS Stock No. 2508806834
Mfr. Part No.EE-SX1235A-P2
BrandOmron
TWD98.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2508958531
Mfr. Part No.NTE3100
TWD236.00
Each
units
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