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. 880-1993
Mfr. Part No.OPB829CZ
BrandOptek
TWD133.00
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
TWD127.10
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. 194-4030
Mfr. Part No.OPB815WZ
BrandOptek
TWD156.00
Each
units
Phototransistor 1 - - Chassis Mount PCB Module - - - - +80°C -40°C 9.53mm 9.53mm
RS Stock No. 908-7144
Mfr. Part No.OPB815WZ
BrandOptek
TWD156.00
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. 908-7217
Mfr. Part No.OPB943W51Z
BrandOptek
TWD181.00
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
RS Stock No. 908-7223
Mfr. Part No.OPB962N51
BrandOptek
TWD111.00
Each
units
Transistor - 70ns 70ns Through Hole Pin 5 12.32 x 6.35 x 10.8mm 10.8mm 12.32mm +70°C -40°C 3.18mm 6.35mm
RS Stock No. 301-8442
Mfr. Part No.OPB620
BrandOptek
TWD56.00
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. 908-7157
Mfr. Part No.OPB821S5Z
BrandOptek
TWD173.00
Each
units
Transistor - - - Free Hanging Wire - 15.24 x 6.35 x 8.89mm 8.89mm 15.24mm +85°C -40°C 2.03mm 6.35mm
RS Stock No. 455-0868
Mfr. Part No.OPB625
BrandOptek
TWD76.00
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
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. 908-7138
Mfr. Part No.OPB804
BrandOptek
TWD55.60
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. 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. 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. 908-7176
Mfr. Part No.OPB856Z
BrandOptek
TWD1,086.00
Each
units
Transistor - - - Panel Mount Wire - 17.27 (Dia.) x 19.3 Hmm 19.3mm - +85°C -40°C - -
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. 880-2040
Mfr. Part No.OPB992T51Z
BrandOptek
TWD186.00
Each
units
- 1 70ns 70ns Screw Mount - 5 12.32 x 6.35 x 10.8mm 10.8mm 12.32mm +70°C -40°C 3.18mm 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. 908-7201
Mfr. Part No.OPB940W51Z
BrandOptek
TWD188.00
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