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. 170-0773
Mfr. Part No.OPB625
BrandOptek
TWD72.60
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. 169-0524
Mfr. Part No.RPI-352
BrandROHM
TWD13.60
Each (In a Bag of 1000)
units
Phototransistor 1 10µs 10µs Through Hole - 4 6.4 x 4.2 x 5.4mm 5.4mm 6.4mm +85°C -25°C 3mm 4.2mm
RS Stock No. 136-0653
Mfr. Part No.TCPT1300X01
BrandVishay
TWD23.00
Each (On a Reel of 2000)
units
Transistor 2 20µs 30µs Surface Mount - 6 5.5 x 4 x 4mm 4mm 5.5mm +105°C -40°C 3mm 4mm
RS Stock No. 818-1497
Mfr. Part No.EE-SX673A
BrandOmron
TWD765.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 788-4962
Mfr. Part No.EE-SX4009-P1
BrandOmron
TWD151.00
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. 908-7150
Mfr. Part No.OPB821Z
BrandOptek
TWD173.00
Each
units
Transistor - - - Through Hole Wire - 15.24 x 6.35 x 8.89mm 8.89mm 15.24mm +85°C -40°C 2.03mm 6.35mm
RS Stock No. 219-2555
Mfr. Part No.EE-SX1042
BrandOmron
TWD110.00
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. 170-0959
Mfr. Part No.OPB840W51Z
BrandOptek
TWD200.30
Each (In a Bag of 100)
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. 908-7154
Mfr. Part No.OPB825
BrandOptek
TWD61.80
Each (In a Pack of 10)
units
Transistor - - - Through Hole Pin 4 10.67 x 6.35 x 11.43mm 11.43mm 10.67mm +85°C -40°C 4.06mm 6.35mm
RS Stock No. 170-0955
Mfr. Part No.OPB830W11Z
BrandOptek
TWD179.50
Each (In a Bag of 100)
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. 170-0960
Mfr. Part No.OPB866T55
BrandOptek
TWD89.70
Each (In a Bag of 100)
units
Transistor 1 - - Screw Mount - 4 24.61 x 6.35 x 10.8mm 10.8mm 24.61mm +85°C -40°C 3.3mm 6.35mm
RS Stock No. 908-7179
Mfr. Part No.OPB850A
BrandOptek
TWD89.00
Each
units
Transistor - - - Snap-In - - 21.16 x 11.6 x 14mm 14mm 21.16mm +75°C -20°C - 11.6mm
RS Stock No. 146-0775
Mfr. Part No.GP1A173LCS3F
BrandSharp
TWD32.10
Each (In a Pack of 10)
units
Photointerrupter 1 166 (Minimum)µs 166 (Minimum)µs Snap-In - 5 27.1 x 9.8 x 16.2mm 16.2mm 27.1mm -30°C +95°C 4.3mm 9.8mm
RS Stock No. 908-7245
Mfr. Part No.OPB990T55Z
BrandOptek
TWD165.00
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. 818-7537
Mfr. Part No.TCUT1350X01
BrandVishay
TWD41.20
Each (In a Pack of 10)
units
Phototransistor 2 9µs 16µs Surface Mount - 6 5.5 x 4 x 4mm 4mm 5.5mm +125°C -40°C 3mm 4mm
RS Stock No. 183-7467
Mfr. Part No.EESX4340
BrandOmron
TWD38.60
Each (In a Pack of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 146-0771
Mfr. Part No.GP1S50J000F
BrandSharp
TWD37.00
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 908-7188
Mfr. Part No.OPB865T51
BrandOptek
TWD99.90
Each (In a Pack of 10)
units
Transistor - - - Through Hole Pin 4 24.63 x 6.35 x 10.8mm 10.8mm 24.63mm +85°C -40°C 3.12mm 6.35mm
RS Stock No. 908-7172
Mfr. Part No.OPB854A3
BrandOptek
TWD95.80
Each (In a Pack of 10)
units
Transistor - - - Through Hole Pin 4 25.4 x 6.35 x 10.8mm 10.8mm 25.4mm +85°C -40°C 5.08mm 6.35mm
RS Stock No. 908-7182
Mfr. Part No.OPB890L55Z
BrandOptek
TWD137.00
Each
units
Transistor - - - Panel Mount Wire - 18.47 x 6.35 x 15.75mm 15.75mm 18.47mm +85°C -40°C 3.3mm 6.35mm