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BT66/UM66 Musical IC

SKU: UTZ1AA5E10
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4.9 (140 reviews)
The BT66/UM66 Musical IC is a compact CMOS melody generator integrated circuit designed to generate pre-programmed musical tunes for electronic devices. It contains an internal ROM that stores a fixed melody consisting of 64 musical notes, eliminating the need for external programming or memory. When powered, the IC automatically begins playing the stored melody through a piezo buzzer or a...
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The BT66/UM66 Musical IC is a compact CMOS melody generator integrated circuit designed to generate pre-programmed musical tunes for electronic devices. It contains an internal ROM that stores a fixed melody consisting of 64 musical notes, eliminating the need for external programming or memory. When powered, the IC automatically begins playing the stored melody through a piezo buzzer or a speaker (using an external transistor for higher sound output).

The BT66/UM66 operates at very low voltage and consumes extremely little current, making it ideal for battery-powered applications. It is widely used in musical greeting cards, electronic toys, doorbells, alarm systems, timers, novelty gadgets, and DIY electronics projects.

Available in a compact TO-92 package, the BT66/UM66 is easy to integrate into Arduino-compatible projects, embedded systems, and educational electronics where simple musical notifications are required.

Key Features

  • Pre-programmed melody generator IC
  • Built-in 64-note ROM memory
  • Low power CMOS technology
  • Ultra-low current consumption
  • Operates from a low supply voltage
  • Automatic melody playback on power-up
  • Can directly drive a piezo buzzer
  • Supports external transistor for speaker drive
  • Compact TO-92 package
  • No external programming required
  • Stable and reliable operation
  • Simple three-pin connection
  • Ideal for battery-powered devices
  • Suitable for DIY and educational electronics projects

Shipping & Returns

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Specifications

Specifications:

IC Type: Musical Melody Generator IC
Part Number: BT66 / UM66
Technology: CMOS
Package Type: TO-92 Through-Hole
Function: Pre-Programmed Melody Generator
Melody Storage: Internal 64-Note ROM
Number of Melodies: Single Melody (Variant Dependent)
Operating Voltage: 0.3V to 3.5V DC
Typical Operating Voltage: 1.5V to 3.3V DC
Standby Current: Approximately 1µA
Operating Current: Approximately 60µA to 100µA
Output Type: Audio Output
Output Drive: Piezo Buzzer Directly or Dynamic Speaker via External NPN Transistor
Reset Function: Automatic Power-On Reset
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +85°C
Mounting Type: Through-Hole
Package Dimensions: Standard TO-92
Compatibility: Piezo Buzzers, BC547/2N2222 Driver Circuits, Arduino Projects, DIY Electronics

Additional Resources

BT66/UM66.PDF

FAQ

1. What is the BT66/UM66 Musical IC used for?

The BT66/UM66 Musical IC is used to generate pre-programmed melodies in applications such as greeting cards, electronic toys, doorbells, alarms, timers, and notification devices.

2. Does the BT66/UM66 require programming?

No. The IC contains an internal ROM with a pre-programmed melody, so it automatically plays the stored tune when power is applied.

3. Can the BT66/UM66 drive a speaker directly?

The IC can directly drive a piezo buzzer. To drive an 8Ω speaker or achieve higher sound output, an external NPN transistor such as a BC547 is typically used.

4. What is the operating voltage of the BT66/UM66 Musical IC?

The IC operates over a supply voltage range of approximately 0.3V to 3.5V DC, with typical operation at 1.5V to 3.3V.

5. Can different BT66/UM66 ICs play different melodies?

Yes. Different versions of the BT66/UM66 are available with different pre-programmed melodies. The melody depends on the specific part number or manufacturer variant.