The UTC UM66T19LK (also labeled as UM66T19LK-T92) is a melody generator integrated circuit manufactured by Unisonic Technologies. This CMOS-based LSI chip contains an on-chip ROM pre-programmed with musical notes, designed for compact applications like doorbells, toys, and telephone ringtone circuits. It features ultra-low power consumption and a built-in oscillator, allowing you to build a simple melody module with minimal external components.
Key features of the UM66T19LK include a 64-note ROM memory, a wide operating voltage range of approximately 1.5 V to 4.5 V, and low current usage. It supports driving a dynamic speaker through an external NPN transistor and includes special modes like “OSC resistor hold mode” and “level hold mode.” Additionally, the melody starts from the first note upon power-on reset.
This chip is particularly useful in DIY projects requiring sound or melody output. You can use it to create musical doorbells, novelty greeting cards with tunes, toy whistlers, or playful alarm circuits. It's ideal for battery-powered gadgets thanks to its low power needs, and its simple TO-92 package makes it easy to integrate into breadboards or perfboards. If you're building a small musical gadget or want a nostalgic tone generator, the UM66T19LK is a convenient and cost-effective choice.
