CUI INC – Launch of compact surface-mount buzzers with high-volume audio output



CUI Inc.’s Components Group has extended its range of micro-buzzers with three new models housed in compact, surface-mount packages, of which the smallest has a footprint of just 4mm x 4mm.

Offering audio outputs at Sound Pressure Levels (SPL) ranging from 65dB to 80dB at a distance of 10cm, these micro-buzzers are ideal for use in portable equipment.

The CMT-4023S-SMT and CMT- 5023S-SMT are magnetic transducer buzzers with a compact footprint of 4mm x 4mm and 5mm x 5mm respectively. Both buzzers have a low profile of 2mm, a rated voltage of 3V and a frequency of 4kHz.

The CMT-4023S-SMT is among the smallest buzzers in the industry, and offers an SPL of 70dB while operating over a temperature range of -20°C to 70°C.

The CMT-5023S-SMT features an SPL of 80dB with an operating temperature range of -30°C to 70°C.

For applications in which electrical noise needs to be kept to a minimum, the 9mm x 9mm CPT-9019S-SMT features piezoelectric technology. With a profile of 1.9mm, it is one of the lowest-profile piezo buzzers on the market.

The CPT-9019S-SMT features a maximum peak-to-peak voltage of 25V, a frequency of 4kHz and an SPL of 65dB. The operating- temperature range for the CPT-9019S-SMT is -30°C to 70°C.

All three models are externally driven and suitable for use in designs requiring reflow solder assembly for high-volume production.


  • Compact footprint
  • Low-profile surface-mount packages
  • Externally driven
  • Reflow solder-compatible


  • Consumer devices
  • Industrial equipment
  • Portable medical devices