{"id":9669,"date":"2026-07-05T09:06:57","date_gmt":"2026-07-05T09:06:57","guid":{"rendered":"https:\/\/materialparts.com\/cmt-8540s-smt-tr\/"},"modified":"2026-07-05T09:06:57","modified_gmt":"2026-07-05T09:06:57","slug":"cmt-8540s-smt-tr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/cmt-8540s-smt-tr\/","title":{"rendered":"CMT-8540S-SMT-TR"},"content":{"rendered":"

Productos<\/h2>\n

The CMT-8540S-SMT-TR from CUI Devices is a surface-mount piezoelectric buzzer with 85dB minimum sound pressure output at its resonant frequency. Operating from a DC supply, it contains a built-in drive circuit that generates a continuous tone without requiring external AC drive. The SMT variant with tape-and-reel packaging enables automated PCB assembly.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n
Min SPL<\/td>\n85 dB @ 10 cm<\/td>\n<\/tr>\n
Resonant Frequency<\/td>\n4 kHz (approx)<\/td>\n<\/tr>\n
Operating Voltage<\/td>\n5 VDC (typ)<\/td>\n<\/tr>\n
Drive Circuit<\/td>\nBuilt-in (self-drive)<\/td>\n<\/tr>\n
Paquete<\/td>\n8.5 x 8.5 x 4.0 mm SMD<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-30C to +70C<\/td>\n<\/tr>\n
Embalaje<\/td>\nTape and Reel (TR)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Self-drive circuitry eliminates need for external AC drive signal<\/li>\n
  • 85dB minimum SPL for clear audible alerts<\/li>\n
  • Compact 8.5mm square SMD package<\/li>\n
  • 5V DC direct operation from logic supply<\/li>\n
  • Tape-and-reel packaging for automated SMT assembly<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Consumer appliance alert and warning indicators<\/li>\n
    • Medical device alarm beeps<\/li>\n
    • Industrial equipment status and fault alerts<\/li>\n
    • Security system audible warnings<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The CMT-8540S-SMT-TR from CUI Devices is a surface-mount piezoelectric buzzer with 85dB minimum sound pressure output at its resonant frequency. Operating from a DC supply, it contains a built-in drive circuit that generates a continuous tone without requiring external AC drive. The SMT variant with tape-and-reel packaging enables automated PCB assembly. Key Specifications […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[947],"chip_brand":[946],"class_list":["post-9669","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-cmt-8540s-smt-tr","chip_brand-cui-device"],"acf":{"brief_explanation":"85dB SMT piezo buzzer, self-drive, 5VDC, 8.5x8.5mm, tape and reel","date_code":"","package_case":"8.5 x 8.5 x 4.0 mm SMD","in_stock":10096,"datasheet":"https:\/\/www.cuidevices.com\/product\/audio-components\/buzzers\/piezo-and-magnetic-buzzers\/cmt-8540s-smt-tr","price":"","product_introduction":"The CUI Devices CMT-8540S-SMT-TR is a surface-mount piezoelectric buzzer with a built-in oscillator circuit that generates a continuous tone when DC power is applied. Unlike external-drive piezo transducers that require an AC drive signal, this self-drive buzzer simply needs a DC supply connection (typically 5V) to operate. The 85dB minimum sound pressure level at 10cm provides clearly audible alert indication in consumer, medical, and industrial environments. The 8.5 x 8.5mm square SMD package is compatible with standard pick-and-place equipment, and the tape-and-reel packaging supports high-volume automated assembly. The low profile of 4.0mm allows use in thin enclosures.","working_principle":"The CMT-8540S contains a piezoelectric ceramic disc bonded to a metal diaphragm, combined with a built-in oscillator circuit. The internal oscillator generates a square-wave drive signal at the resonant frequency of the piezo element (approximately 4kHz), causing the disc to vibrate at maximum amplitude and produce the loudest possible sound output. The built-in oscillator eliminates the need for external drive circuitry on the host PCB, simplifying system design to just a DC power connection and a control signal.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VCC<\/td>Power<\/td>Supply voltage (5V DC)<\/td><\/tr>
      2<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr><\/table>","application_scenarios":"
      • Consumer appliance alert and warning indicators<\/li>
      • Medical device alarm beeps<\/li>
      • Industrial equipment status and fault alerts<\/li>
      • Security system audible warnings<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        CUI<\/td>CMT-8540S-SMT<\/td>8.5mm SMD<\/td>Same, non-TR packaging<\/td><\/tr>
        Murata<\/td>PKM13EPYH4000-A0<\/td>SMD<\/td>Piezo buzzer, similar SPL<\/td><\/tr>
        PUI Audio<\/td>AI-3640-TWT-12V-R<\/td>SMD<\/td>12V buzzer, similar size<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=9669"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9669\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=9669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=9669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=9669"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=9669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}