{"id":9555,"date":"2026-07-03T08:47:45","date_gmt":"2026-07-03T08:47:45","guid":{"rendered":"https:\/\/materialparts.com\/inmp621acez-r7\/"},"modified":"2026-07-03T08:47:45","modified_gmt":"2026-07-03T08:47:45","slug":"inmp621acez-r7","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/inmp621acez-r7\/","title":{"rendered":"INMP621ACEZ-R7"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The INMP621ACEZ-R7 from InvenSense (TDK) is a wide dynamic range MEMS microphone with PDM digital output, achieving 133 dB SPL acoustic overload point and 65 dBA SNR. In a 4 x 3 x 1 mm LGA package, it delivers studio-quality audio capture for voice recognition, conferencing, and high-SPL recording applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nMEMS Microphone (bottom port)<\/td>\n<\/tr>\n
Directivity<\/td>\nOmnidirectional<\/td>\n<\/tr>\n
Acoustic Overload Point<\/td>\n133 dB SPL (THD=10%)<\/td>\n<\/tr>\n
SNR<\/td>\n65 dBA<\/td>\n<\/tr>\n
Sensitivity<\/td>\n-46 dBFS @ 94 dB SPL<\/td>\n<\/tr>\n
Frequency Response<\/td>\n45 Hz – >20 kHz<\/td>\n<\/tr>\n
\u8f93\u51fa<\/td>\nPDM digital (single bit)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n1.62 – 3.63 V<\/td>\n<\/tr>\n
Current<\/td>\n1.2 mA (typical)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nLGA (4 x 3 x 1 mm)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u81f3+85\u6444\u6c0f\u5ea6<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • 133 dB SPL acoustic overload for high-SPL environments<\/li>\n
  • 65 dBA SNR for low-noise audio capture<\/li>\n
  • PDM digital output eliminates external ADC requirement<\/li>\n
  • Ultra-compact 4 x 3 x 1 mm bottom-port LGA package<\/li>\n
  • 45 Hz to >20 kHz wideband frequency response<\/li>\n
  • 1.2 mA low operating current<\/li>\n
  • Stereo capability via L\/R select pin<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Voice recognition and smart speaker arrays<\/li>\n
    • Video conferencing and telepresence audio<\/li>\n
    • High-SPL music recording and live events<\/li>\n
    • Automotive hands-free communication<\/li>\n
    • Industrial acoustic monitoring and machine diagnostics<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The INMP621ACEZ-R7 from InvenSense (TDK) is a wide dynamic range MEMS microphone with PDM digital output, achieving 133 dB SPL acoustic overload point and 65 dBA SNR. In a 4 x 3 x 1 mm LGA package, it delivers studio-quality audio capture for voice recognition, conferencing, and high-SPL recording applications. Key Specifications Type […]<\/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":[13,42],"tags":[797],"chip_brand":[165],"class_list":["post-9555","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","tag-inmp621acez-r7","chip_brand-adi"],"acf":{"brief_explanation":"MEMS microphone, 133dB SPL AOP, PDM, InvenSense","date_code":"","package_case":"LGA (4 x 3 x 1 mm)","in_stock":10509,"datasheet":"https:\/\/invensense.tdk.com\/products\/digital\/inmp621\/","price":"$1.14 @ 1ku","product_introduction":"The INMP621ACEZ-R7 from InvenSense (TDK) is a wide dynamic range MEMS microphone with PDM digital output in a 4 x 3 x 1 mm LGA package. With 133 dB SPL acoustic overload point and 65 dBA SNR, it captures audio from whisper-quiet to extreme SPL environments without clipping. The fourth-order sigma-delta modulator outputs a 1-bit PDM signal, eliminating the need for an external ADC. The 1.2 mA operating current and 45 Hz to >20 kHz frequency response suit battery-powered voice recognition, conferencing, and high-fidelity recording applications. Note: This product is EOL; InvenSense recommends T5838 as the replacement for new designs.","working_principle":"The INMP621 uses a capacitive MEMS transducer where a thin polysilicon diaphragm is suspended above a perforated backplate, forming a variable capacitor. Sound pressure deflects the diaphragm, changing the capacitance. A CMOS ASIC integrates a charge amplifier, anti-aliasing filter, and fourth-order sigma-delta modulator on the same die as the MEMS structure. The modulator converts the analog capacitance change into a 1-bit PDM (Pulse Density Modulation) stream at the clock frequency (typically 2.4-4.8 MHz). The host codec or DSP decimates the PDM stream to produce a multi-bit PCM audio signal. The L\/R select pin enables two INMP621 devices to share a single data line, with left and right channels time-multiplexed on alternate clock edges for stereo capture.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>SCK<\/td>Input<\/td>PDM clock input from host codec\/DSP<\/td><\/tr>\n
      2<\/td>L\/R SELECT<\/td>Input<\/td>Left\/Right channel select (GND=Right, VDD=Left)<\/td><\/tr>\n
      3<\/td>DOUT<\/td>Output<\/td>PDM data output to host<\/td><\/tr>\n
      4<\/td>VDD<\/td>Power<\/td>Power supply 1.62-3.63V (0.1uF decoupling required)<\/td><\/tr>\n
      5<\/td>GND<\/td>Ground<\/td>Ground reference<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Voice recognition and smart speaker arrays<\/li>\n
      • Video conferencing and telepresence audio<\/li>\n
      • High-SPL music recording and live events<\/li>\n
      • Automotive hands-free communication<\/li>\n
      • Industrial acoustic monitoring and machine diagnostics<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        InvenSense<\/td>INMP441<\/td>LGA<\/td>Lower cost, 120dB SPL AOP alternative<\/td><\/tr>\n
        InvenSense<\/td>T5838<\/td>LGA<\/td>Recommended replacement for new designs<\/td><\/tr>\n
        TDK<\/td>ICS-43434<\/td>LGA<\/td>32-bit I2S output alternative<\/td><\/tr>\n
        Knowles<\/td>SPH0645LM4H<\/td>LGA<\/td>65dB SNR I2S alternative<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=9555"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9555\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9555"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}