{"id":6825,"date":"2026-06-21T12:48:56","date_gmt":"2026-06-21T12:48:56","guid":{"rendered":"https:\/\/materialparts.com\/mcp3421a0t-e-ch\/"},"modified":"2026-06-21T12:48:56","modified_gmt":"2026-06-21T12:48:56","slug":"mcp3421a0t-e-ch","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/mcp3421a0t-e-ch\/","title":{"rendered":"MCP3421A0T-E\/CH"},"content":{"rendered":"

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

The MCP3421A0T-E\/CH from Microchip Technology is an 18-bit delta-sigma ADC with I2C interface, onboard 2.048V reference, and programmable gain amplifier (PGA) in a tiny SOT-23-6 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\n18-Bit Delta-Sigma ADC with I2C Interface<\/td>\n<\/tr>\n
Resolution<\/td>\n18 \/ 16 \/ 14 \/ 12 bits (selectable)<\/td>\n<\/tr>\n
Sample Rate<\/td>\n3.75 \/ 15 \/ 60 \/ 240 SPS<\/td>\n<\/tr>\n
\u8f93\u5165\u7c7b\u578b<\/td>\n1 differential<\/td>\n<\/tr>\n
Reference Voltage<\/td>\n2.048V internal (+\/-0.05%, 5 ppm\/C)<\/td>\n<\/tr>\n
PGA Gain<\/td>\n1x, 2x, 4x, 8x<\/td>\n<\/tr>\n
INL<\/td>\n10 ppm of FSR (max)<\/td>\n<\/tr>\n
Interface<\/td>\nI2C (Standard\/Fast\/High-Speed)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n2.7 V to 5.5 V<\/td>\n<\/tr>\n
Supply Current<\/td>\n145 uA (continuous), 39 uA (1 SPS one-shot)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-23-6<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +125C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 18-bit resolution in tiny SOT-23-6 package<\/li>\n
  • Onboard 2.048V reference with 5 ppm\/C drift<\/li>\n
  • Programmable gain amplifier (1x to 8x)<\/li>\n
  • Self-calibration of offset and gain per conversion<\/li>\n
  • One-shot and continuous conversion modes<\/li>\n
  • I2C interface with standard\/fast\/high-speed modes<\/li>\n
  • Ultra-low 39 uA in one-shot mode at 1 SPS<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Precision weigh scales and strain gauges<\/li>\n
    • Temperature sensing with RTD\/thermocouple<\/li>\n
    • Battery fuel gauging<\/li>\n
    • Portable instrumentation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MCP3421A0T-E\/CH from Microchip Technology is an 18-bit delta-sigma ADC with I2C interface, onboard 2.048V reference, and programmable gain amplifier (PGA) in a tiny SOT-23-6 package. Key Specifications Type 18-Bit Delta-Sigma ADC with I2C Interface Resolution 18 \/ 16 \/ 14 \/ 12 bits (selectable) Sample Rate 3.75 \/ 15 \/ 60 \/ […]<\/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":[19,13],"tags":[],"chip_brand":[134],"class_list":["post-6825","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-microchip"],"acf":{"brief_explanation":"18-Bit Delta-Sigma ADC, I2C, PGA 1-8x, 2.048V Ref, SOT-23-6","date_code":"","package_case":"SOT-23-6 (2.9 x 1.6 x 1.1 mm)","in_stock":16299,"datasheet":"https:\/\/ww1.microchip.com\/downloads\/en\/DeviceDoc\/22003e.pdf","price":"$1.80 @ 1ku","product_introduction":"The MCP3421A0T-E\/CH from Microchip Technology is a single-channel 18-bit delta-sigma ADC in a tiny SOT-23-6 package. The device integrates a precision 2.048V reference (+\/-0.05%, 5 ppm\/C drift), programmable gain amplifier (1x\/2x\/4x\/8x), and an internal oscillator. Resolution and sample rate are programmable: 18-bit at 3.75 SPS, 16-bit at 15 SPS, 14-bit at 60 SPS, or 12-bit at 240 SPS. The onboard PGA allows direct measurement of small signals like thermocouple outputs and strain gauge bridges without external amplification. Self-calibration of offset and gain is performed automatically on each conversion. The one-shot mode reduces supply current to just 39 uA for battery-powered applications.","working_principle":"The MCP3421A0T-E\/CH uses a third-order delta-sigma modulator followed by a digital decimation filter. The modulator oversamples the input at a high frequency (approximately 3.072 MHz internal clock) and converts the analog signal into a 1-bit data stream. The decimation filter reduces the data rate to the selected output rate (3.75 to 240 SPS) while increasing effective resolution. Higher oversampling ratios (lower output rates) provide more resolution: 18 bits at 3.75 SPS requires 2^17 = 131072 oversampling ratio. The PGA before the modulator amplifies small input signals up to 8x, improving the signal-to-noise ratio for low-level inputs. The onboard 2.048V reference sets the full-scale range at +\/-2.048V \/ PGA. Each conversion includes automatic offset and gain calibration, where the modulator measures internal zero and full-scale references and applies digital correction to the output code. The I2C interface provides read access to conversion results and write access to configuration bits (PGA gain, sample rate, conversion mode).","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>SCL<\/td>Input<\/td>I2C clock<\/td><\/tr>
      2<\/td>SDA<\/td>I\/O<\/td>I2C data<\/td><\/tr>
      3<\/td>VSS<\/td>Ground<\/td>Ground<\/td><\/tr>
      4<\/td>VIN+<\/td>Input<\/td>Differential non-inverting input<\/td><\/tr>
      5<\/td>VIN-<\/td>Input<\/td>Differential inverting input<\/td><\/tr>
      6<\/td>VDD<\/td>Power<\/td>Supply voltage (2.7-5.5V)<\/td><\/tr><\/table>","application_scenarios":"
      • 24-bit effective weigh scale using 18-bit ADC with PGA x8 for load cell<\/li>
      • K-type thermocouple temperature measurement with cold junction compensation<\/li>
      • 4-20mA current loop receiver with 250 Ohm shunt and 18-bit ADC<\/li>
      • Portable battery fuel gauge with one-shot mode for power saving<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Microchip<\/td>MCP3422A0-E\/SN<\/td>SOIC-8<\/td>2-channel version<\/td><\/tr>
        Microchip<\/td>MCP3424SL<\/td>SOIC-14<\/td>4-channel version<\/td><\/tr>
        TI<\/td>ADS1115IDGSR<\/td>VSSOP-10<\/td>16-bit, 4-ch, similar class<\/td><\/tr>
        ADI<\/td>AD7124-4BCPZ<\/td>LFCSP-24<\/td>24-bit, 4-ch, higher performance<\/td><\/tr>
        Microchip<\/td>MCP3561R<\/td>TSSOP-20<\/td>24-bit, SPI, upgrade path<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6825","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=6825"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6825\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6825"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}