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. 700-3996
Mfr. Part No.RPI-579N1
BrandROHM
$1.495
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
RS Stock No. 124-6792
Mfr. Part No.RPI-0352E
BrandROHM
$0.882
Each (In a Pack of 10)
units
Phototransistor 1 10µs 10µs Surface Mount - 4 6.4 x 4.2 x 5.4mm 5.4mm 6.4mm +85°C -30°C 3mm 4.2mm
RS Stock No. 133-3287
Mfr. Part No.RPI-441C1E
BrandROHM
$0.649
Each (In a Pack of 25)
units
Phototransistor 1 10µs 10µs Through Hole - 4 8 x 4.2 x 5.2mm 5.2mm 8mm +85°C -25°C 4mm 4.2mm
RS Stock No. 124-6794
Mfr. Part No.RPI-246
BrandROHM
$0.655
Each (In a Pack of 15)
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. 124-6797
Mfr. Part No.RPI-441C1
BrandROHM
$0.769
Each (In a Pack of 15)
units
Phototransistor 1 10µs 10µs Through Hole - 4 8 x 4.2 x 5.2mm 5.2mm 8mm +85°C -25°C 4mm 4.2mm
RS Stock No. 124-6793
Mfr. Part No.RPI-243
BrandROHM
$1.041
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. 124-6791
Mfr. Part No.RPI-0226
BrandROHM
$0.729
Each (In a Pack of 15)
units
Phototransistor 1 30µs 30µs Surface Mount SMD 4 4.4 x 2.7 x 2.8mm 2.8mm 4.4mm +85°C -30°C 2mm 2.7mm
RS Stock No. 700-3999
Mfr. Part No.RPI-352
BrandROHM
$1.495
Each (In a Pack of 2)
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. 169-0524
Mfr. Part No.RPI-352
BrandROHM
$0.641
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. 169-0523
Mfr. Part No.RPI-579N1
BrandROHM
$0.682
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