The CPC1601M, an innovative 60 V, 2 A typically open (1-Form-A) solid-state latching relay from Littelfuse, is intended to solve important integration and power efficiency issues in thermostats, HVAC systems, and building automation.
The Solid-State Latching Relay, CPC1601M is the first solid-state relay installed on a PCB that combines a latching architecture with load-powered operation in a 3 × 3 mm DFN device.
Zero-power operation, which significantly increases battery life or eliminates the need for batteries, is made possible by its capacity to harvest operational power directly from the load or take less than 1 ?A from the system supply.
Features and Benefits
- Latching relay architecture requires only a single pulse to change states, minimizing energy draw.
- Harvest mode enables operation using only the open-circuit load—no system power required.
- Power output pin provides up to 10 mW to external circuits, supporting additional low-power functions.
- Compact 3 × 3 mm DFN package reduces PCB footprint and enables ultra-thin device profiles.
- Zero-cross switching reduces electrical noise and improves reliability in AC loads.
- TTL/CMOS-compatible inputs ensure easy integration with microcontrollers or logic circuits.
Markets and Applications
- Smart thermostats
- Fire alarm panels
- Security and access control systems
- Building and HVAC automation
- Industrial control systems
- Utility metering and instrumentation
Leadership Comments
“With the launch of the Solid-State Latching Relay 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 Dr. 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. It’s a natural extension of our solid-state relay portfolio, reinforcing our commitment to solving real-world design challenges with compact, reliable, and forward-thinking solutions.”
Solving Real-World Challenges
The CPC1601M simplifies installations, particularly in older buildings, by eliminating the need for a common (C) wire for engineers creating smart thermostats and two-wire control systems. In addition to eliminating moving parts and clicking sounds, its solid-state functioning provides a durable and silent substitute for mechanical relays.
While installers save time and money by removing extra wiring or external power supplies, end users gain from thinner, quieter, and maintenance-free devices.
The Littelfuse solid-state relay portfolio has significantly expanded with the CPC1601M, solidifying the company’s leadership in cutting-edge switching solutions for next-generation control systems.
Availability
These solid-state relays are available in quantities of 2,000 per reel. Sample requests are accepted through authorized Littelfuse distributors worldwide.
For a listing of Littelfuse distributors, CLICK HERE.
