Efficient & compact isolated digital inputs
Replace your optocoupler and simplify your PLC, grid or motor drive design
Isolated digital inputs provide galvanic isolation between a sensor input, or other input type, and a logic output for a host controller interface. Compared to traditional optocoupler solutions, our isolated digital input devices provide a simple, low-power alternative with an accurate current limit. This alternative to optocouplers enables the design of compact and high-density I/O modules for PLC, AC and servo drives, and protection relay or substation automation grid applications.
ISO121x family of isolated digital input receivers
The ISO1211 and ISO1212 devices are isolated, 24-V to 60-V digital input receivers that improve on traditional optocoupler designs for high-density I/O modules.
Find out how isolated digital inputs differ from digital isolators and why they are designed specifically for programmable logic control (PLC), motor control and grid applications.
Evaluate our isolated digital inputs
Each of our isolated digital inputs has an evaluation module (EVM) that you can use the test the performance of our devices.
Learn more about isolated digital inputs
Reference designs featuring our isolated digital inputs
This reference design implements 16 isolated digital input channels, split into two groups of eight channels each. Broken wire detection can be executed using only one additional optical switch per channel or two optical switches and one additional capacitor for each group, with no secondary side supply needed.
This reference design shows a compact implementation of 16 isolated digital input channels where all channels consume less than 1 W of input power combined, enabling a compact layout with minimal heat dissipation.
This reference design features 96 isolated digital input channels with better thermal performance than traditional optocoupler solutions. This design makes a digital input board with multiple channels more compact and decreases board temperature (less than 50°C).