Littelfuse announced the release of the CPC2501M, a normally closed solid-state relay designed for chime bypass in video doorbell systems. The CPC2501M is the first application-specific integrated circuit (ASIC) in Littelfuse’s portfolio for this purpose, replacing discrete relay circuitry. It integrates self-protection, fault timing, and solid-state switching in a 6x6 mm QFN package, aiming to simplify integration and enhance reliability for video doorbell systems.
The IC features self-actuating logic, eliminating the need for external microcontrollers or software. It includes a fault protection timer of approximately 17 seconds to reset during prolonged button presses or chime failures. The device supports 60 VP bidirectional voltage, 1.84 ARMS continuous load current, and a peak current of 5 A for start-up and surge conditions. Its 6x6 mm QFN-16 package is thermally optimized to save PCB space, and it is compatible with standard 8–24 VAC doorbell transformers.
The CPC2501M addresses the challenge of powering video doorbells using legacy home wiring and mechanical chimes by creating a power bypass path when the chime is inactive and disabling it during doorbell operation, ensuring continuous camera power and chime functionality without extensive retrofitting.
Beyond video doorbells, the CPC2501M is suitable for building automation controls, IoT devices with voltage-controlled actuation, security systems requiring compact solid-state switching, and general-purpose voltage-controlled relay designs.
The CPC2501M is available in tape and reel format in quantities of 3,000 through authorized Littelfuse distributors worldwide. Additional details can be found on the CPC2501M product page at Littelfuse.com.
