Diodes API772x Raises Reinforced Digital Isolation for Power and Industrial Designs

Digital control loops inside modern power supplies face far tougher electrical environments than they did even a few years ago. High frequency switching, wide bandgap devices and dense PCB layouts all increase the chance that noise finds its way into logic domains. That makes the isolators sitting between high side power stages and low voltage controllers critical to the overall stability of the system. Diodes Incorporated’s API772x family is built around that need, offering reinforced isolation ratings, strong transient immunity and channel flexibility for applications that have to operate reliably over long service lives.

At its core, the API772x line provides two galvanically isolated digital channels with insulation levels that meet reinforced isolation requirements. Rather than treating isolation as a single rating, the devices are designed to withstand fast transients, common mode disturbances and long term electrical stress. This is especially relevant in new energy power systems, industrial automation platforms and high density server supplies where isolation devices may be exposed to repeated switching events and temperature cycling.

Why High CMTI and Reinforced Insulation Matter in Power Designs

When switching devices transition, ground potentials can move abruptly. In converters using MOSFETs or SiC switches, these edges can exceed hundreds of kilovolts per microsecond. Any isolator placed between the primary and secondary sides has to preserve signal timing despite these disturbances. The API772x family specifies a high minimum common mode transient immunity, which helps maintain output stability even when the surrounding circuitry experiences rapid voltage swings. Low emissions and strong electromagnetic immunity further support reliable communication in environments where noise paths are unpredictable.

The portfolio covers common signalling patterns. Some designs need both channels to move in the same direction, while others rely on a return signal or fault indication path back to the controller. The API7720 provides two channels in one direction, while the API7721 and API7722 split them. Default output levels can be selected as high or low depending on startup behaviour requirements. These small options matter in systems that must reach a safe initial state before full operation.

Electrical and Packaging Details That Influence Reliability

A supply voltage range of 2.5 to 5.5 volts allows these isolators to pair cleanly with a wide set of microcontrollers and communication transceivers. Support for data rates up to 100 Mbps covers a broad range of digital interfaces found in power and industrial systems. Housing the devices in a wide body SO 8W package increases creepage and clearance spacing, which is often a limiting factor in meeting reinforced isolation rules.

Another detail worth noting is the predicted isolation barrier lifetime. The devices are rated for lifetimes that suit long duration installations such as data centers, grid connected hardware and industrial machinery. In these settings, the cost of replacing isolation components far exceeds the component price. Stability over decades becomes a selection criterion, not a convenience.

How Isolation Shapes Next Generation Power and Automation Equipment

Isolation devices tend to be overlooked when system designers focus on semiconductors that switch faster or run cooler. Yet as architectures become more compact and switching behaviour becomes more aggressive, the isolator often ends up defining the boundaries of system reliability. The API772x family fits into this shift by combining reinforced insulation, high CMTI, flexible channel direction and low power consumption. It offers a predictable interface for digital signals that need to cross noisy domains without compromising timing or safety.

As new energy systems, robotics and data center supplies continue to push electrical and thermal boundaries, isolation reliability will only grow in importance. Families like API772x help ensure that logic and control layers stay protected even as the power stages become more demanding.

Learn more and read the original announcement at www.diodes.com