A new solid-state relay with a 0.5 mA trigger current and high isolation is designed for dense, low-noise systems across security, industrial, medical, and EV-charging applications.
Littelfuse has introduced a new solid-state relay aimed at designers pushing for faster, quieter, and more energy-efficient switching in next-gen electronics. The CPC1056N is a 60 V, 75 mA 1-Form-A SSR built around an ultra-low 0.5 mA LED trigger current allowing direct TTL/CMOS drive without the support components often required in low-power systems. With switching times of about 3 ms and a 1500 VRMS isolation rating, it targets the surge in compact, electrically quiet systems across security, industrial automation, medical devices, and EV charging infrastructure.
The key features are:
- 0.5 mA LED trigger current for direct TTL/CMOS and microcontroller drive
- 3 ms switching speed enabling low-latency control paths
- 1500 VRMS isolation for safety in sensitive mixed-signal designs
- Solid-state architecture with silent, EMI-free operation
- Compact SOP-4 package optimized for space-constrained PCBs
The relay’s solid-state architecture eliminates the mechanical wear, audible clicks, and EMI/RFI issues seen in electromechanical relays. Packaged in a space-saving 4-pin SOP, it slots directly into high-density designs such as smart meters, sensor nodes, compact controllers, and portable medical equipment where every millimeter of PCB counts. By trimming both input power and design complexity, the device aligns with the broader industry shift toward energy-sensitive systems that demand predictable, maintenance-free switching.
Beyond its electrical specs,it arrives certified to EN50130-4, UL 1577, and EN 62368-1 standards, making it particularly relevant for alarm panels, PIR detectors, and other security gear where robust isolation and noise immunity matter. In industry and test environments, its combination of fast actuation and silent operation serves multiplexer boards, factory controls, and automated fixtures where mechanical relays struggle with endurance or switching noise.
The EV ecosystem is another key target. As chargers adopt increasingly granular signal-level control/feedback loops, pilot signal conditioning, low-power relay logic the need for compact SSRs capable of running directly from microcontroller GPIO is expanding. The relay fits that niche, pairing efficiently with Littelfuse’s existing circuit protection portfolio for charger control paths.
Smart utilities and building automation are set to benefit as well. In smart meters, the low trigger current helps reduce system power budgets, while the SSR’s isolation rating supports safe interfacing between measurement circuits and communication modules. In home and commercial automation, the silent switching suits noise-sensitive environments and compact appliance control boards.
