This product provides four channels of optical isolation with both a non-inverting output and an inverting output for each channel.
Both the input side and the output side are designed to interface with equipment using logic voltages of anywhere from 3.3V to 24V.
This robust design includes low-side output drivers that provide significant sink current capability. Reverse-polarity
protection on inputs and outputs is also included.
Note that on the output side, the four channels share a commond pull-up rail (VPU) and a common ground reference (GND).
This board includes terminal blocks to provide convenient access to the signals.
Simplified Schematic of OPI104 Click image to enlarge.
An opto-isolator is sometimes referred to as a "photocoupler", "optical coupler", "optocoupler", "opto coupler", or "optical isolator".
Interface between equipment with different grounds
Interface between equipment with different logic levels
Low-side driver for small DC loads (motors, solenoids, bulbs, etc)
The original OPI104 variant (OPI104-DIN, OPI104-FT) utilizes an output stage which includes current limit and thermal limit features, but whose output switching
speeds are slower due to the protection circuitry. Due to present supply chain delays for the protected output stage components, we have introduced a new variant which uses a
standard output stage, and whose switching speeds are much faster. The new part numbers are OPI104-HS-DIN and OPI104-HS-FT.
OPI104: outputs feature protected N-FETs with built-in current limit and thermal limit
OPI104-HS: outputs feature standard N-FETs with lower resistance and faster switching
4-Channel opto-isolator, protected output stage, DIN Mount
4-Channel opto-isolator, standard output stage, DIN Mount
4-Channel opto-isolator, standard output stage, Rubber Feet
OPI104 Selection Guide
Compares the OPI104 Variants
These products are available in two different mounting variants. Product numbers ending with -DIN come
with DIN clips already installed and ready to snap onto 35mm or 32mm DIN rail. Product numbers ending with -FT
have stick-on rubber feet installed on the bottom side, allowing for benchtop use or panel mounting. For panel mounting, we suggest
1/4" nylon standoffs under the mounting holes, and #6 screws.
DIN Rail Mount OPI104-DIN Click image to enlarge. Rail not included
Rubber Feet OPI104-FT Click image to enlarge.
Four channels of optical isolation with open-drain outputs
Non-inverting output and inverting output for each channel
LEDs provide visual indication for each signal and power
Wide operating voltage range (3.3V to 24V)
Suitable for signals from 3.3V logic up to 24V logic
Buffered output stage for higher current sink capability
Includes reverse-polarity protection on inputs and outputs
Redundant power and ground terminal-block connections
On the input side, the 4 channels are completely independent
On the output side, the 4 channels share a commond pull-up rail and GND
All of the above items are normally stocked. Please call us if you need to verify availability for a specific quantity, or for pricing at higher quantities. Please visit our ordering page for our ordering policies and a list of ordering methods.