Illinois-based electronic components maker Littelfuse says its latest load-powered latching relay can simplify smart HVAC and building control designs.

The CPC1601M compact relay enables battery-less or low-power operation for thermostats, building automation, HVAC and security systems.

The 60V, 2A normally open (1-Form-A) solid-state latching relay addresses critical integration and power efficiency problems in thermostats, HVAC systems and building automation.

This PCB-mounted solid-state relay combines load-powered operation with a latching architecture in a 3 by 3mm DFN package. Its ability to harvest operating power directly from the load or draw less than 1μA from the system supply enables zero-power operation, extending battery life or eliminating the need for batteries.

“With the launch of the CPC1601M, we’re giving our customers a powerful new tool to design smarter, more efficient control systems, especially in space-constrained and energy-sensitive applications like building automation,” said Hugo Guzman, product marketing manager at Littelfuse. “This innovative SSR relay reduces system power consumption through its unique load-powered operation and simplifies integration into both modern and legacy installations.”

For engineers designing smart thermostats and two-wire control systems, the relay removes the need for a common wire, simplifying installations, especially in older buildings. Its solid-state operation also eliminates clicking sounds and moving parts, offering a silent and long-lasting alternative to mechanical relays.

End-users benefit from slimmer, quieter and maintenance-free devices, while installers save time and cost by avoiding additional wiring or external power kits.

The latching relay architecture requires only a single pulse to change states, reducing energy draw. Harvest mode enables operation using only the open-circuit load, so no system power is required. The power output pin provides up to 10mW to external circuits, supporting additional low-power functions. Zero-cross switching reduces electrical noise and improves reliability in AC loads. TTL and CMOS-compatible inputs ensure easy integration with microcontrollers or logic circuits.

These solid-state relays are available in quantities of 2000 per reel. Sample requests are accepted through authorised Littelfuse distributors worldwide.

Littelfuse (www.littelfuse.com) is a diversified, industrial technology manufacturing company operating across more than 20 countries with around 16,000 global associates. Serving over 100,000 end customers, its products are found in various industrial, transportation and electronics end markets.

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