CUI INC – Micro Buzzer Product Line Expands to Include Industry’s Smallest Package


CUI’s Components Group has several new additions to its range of micro buzzers. The three newer models are housed in compact, surface mount packages as small as 4 x 4mm. Featuring profile depths as low as 1.9mm and sound pressure levels (SPL) ranging from 65dB up to 80dB at 10cm, these micro buzzers are ideal for a range of portable equipment applications.

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

The CMT-4023S-SMT with its 4 x 4mm package is among the smallest in the industry while carrying an SPL of 70dB and an operating temperature range of -20°C to +70°C.

The 5mm CMT-5023S-SMT features an SPL of 80dB with an operating temperature range of -30°C to +70°C.

For applications where electrical noise is more of a concern, the 9 x 9mm CPT-9019S-SMT features piezoelectric technology and a profile depth of 1.9mm – making it one of the lowest profile piezo buzzers on the market.

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

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


  • Compact
  • Low profile
  • Surface mount package


  • Consumer
  • Industrial
  • Medical portable electronics