{"id":9611,"date":"2026-07-04T10:33:29","date_gmt":"2026-07-04T10:33:29","guid":{"rendered":"https:\/\/materialparts.com\/cme0303s3c\/"},"modified":"2026-07-04T10:33:29","modified_gmt":"2026-07-04T10:33:29","slug":"cme0303s3c","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/cme0303s3c\/","title":{"rendered":"CME0303S3C"},"content":{"rendered":"

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

The CME0303S3C from Murata Power Solutions is a 0.75 W isolated DC-DC converter in a compact SIP-4 package, converting 3.3 V input to 3.3 V output at up to 227 mA. With 3 kVDC galvanic isolation and 73% typical efficiency, it provides reliable isolation for signal conditioning, ground loop elimination, and noise isolation in industrial and consumer applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u8f93\u5165\u7535\u538b<\/td>\n2.97 V to 3.63 V (3.3 V nominal)<\/td>\n<\/tr>\n
Output Voltage<\/td>\n3.3 V (fixed)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n227 mA max<\/td>\n<\/tr>\n
Output Power<\/td>\n0.75 W<\/td>\n<\/tr>\n
\u9694\u79bb\u7535\u538b<\/td>\n3000 VDC<\/td>\n<\/tr>\n
Efficiency<\/td>\n73% typical<\/td>\n<\/tr>\n
Line Regulation<\/td>\n\u00b11.2%<\/td>\n<\/tr>\n
Load Regulation<\/td>\n12%<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n135 kHz typical<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to 85\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSIP-4 Module (11.53 x 6.1 x 7.46 mm)<\/td>\n<\/tr>\n
Safety Approval<\/td>\nUL60950<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 3 kVDC galvanic isolation for safety and noise isolation<\/li>\n
  • Compact SIP-4 through-hole package with minimal PCB footprint<\/li>\n
  • UL60950 safety approval for ITE equipment<\/li>\n
  • Wide operating temperature range from -40\u00b0C to 85\u00b0C<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial process control signal isolation<\/li>\n
    • Ground loop elimination in data acquisition systems<\/li>\n
    • Medical equipment isolated power rails<\/li>\n
    • Telecom interface isolation barriers<\/li>\n
    • Isolated sensor power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The CME0303S3C from Murata Power Solutions is a 0.75 W isolated DC-DC converter in a compact SIP-4 package, converting 3.3 V input to 3.3 V output at up to 227 mA. With 3 kVDC galvanic isolation and 73% typical efficiency, it provides reliable isolation for signal conditioning, ground loop elimination, and noise isolation […]<\/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":[31,13],"tags":[862],"chip_brand":[202],"class_list":["post-9611","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","tag-cme0303s3c","chip_brand-murata"],"acf":{"brief_explanation":"0.75W isolated DC-DC converter, 3.3V to 3.3V, 227mA, 3kVDC isolation, SIP-4","date_code":"","package_case":"SIP-4 Module (11.53 x 6.1 x 7.46 mm)","in_stock":2618,"datasheet":"https:\/\/www.murata.com\/products\/productdata\/8807029342238\/kdc-cme.pdf","price":"$4.80 @ 1+","product_introduction":"The CME0303S3C from Murata Power Solutions is a 0.75 W single-output isolated DC-DC converter in the CME series. It accepts a 3.3 V nominal input (2.97\u20133.63 V range) and provides a regulated 3.3 V output at up to 227 mA. The converter delivers 3000 VDC galvanic isolation between input and output, making it suitable for applications requiring safety isolation, ground loop elimination, or noise barrier separation. The unregulated output topology means load regulation is 12%, which is acceptable for digital logic power rails. The compact SIP-4 through-hole module measures just 11.53 x 6.1 x 7.46 mm, and the device carries UL60950 safety approval.","working_principle":"The CME0303S3C operates as an isolated flyback DC-DC converter: (1) Input Stage \u2014 the 3.3 V DC input is filtered and fed to a self-oscillating switching circuit operating at approximately 135 kHz; (2) Isolation Transformer \u2014 a miniature planar transformer provides galvanic isolation rated at 3000 VDC, with the turns ratio set to achieve the 3.3 V output; (3) Output Rectification \u2014 the secondary winding voltage is rectified by a diode and filtered by an output capacitor, providing the 3.3 V DC output; (4) Regulation \u2014 as an unregulated converter, output voltage varies with load (12% load regulation) and input (\u00b11.2% line regulation), which is sufficient for logic-level power rails with downstream regulation if tighter tolerance is required.","pin_description":"
      Pin<\/th>Function<\/th><\/tr>
      1<\/td>VIN+ \u2014 Positive input voltage (3.3 V)<\/td><\/tr>
      2<\/td>VIN- \u2014 Input ground<\/td><\/tr>
      3<\/td>VOUT+ \u2014 Positive output voltage (3.3 V)<\/td><\/tr>
      4<\/td>VOUT- \u2014 Output ground (isolated from input ground)<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial PLC analog input module providing isolated 3.3 V power to each channel's ADC<\/li>
      • Data acquisition system eliminating ground loops between sensor and MCU by isolating the 3.3 V sensor supply<\/li>
      • Medical patient monitoring equipment requiring 3 kV isolation for patient safety compliance<\/li>
      • Telecom line card generating isolated 3.3 V for SLIC circuit bias from the 3.3 V backplane<\/li>
      • Isolated RS-485 transceiver power supply for noise immunity in industrial networks<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        CME0305S3C<\/td>Murata<\/td>3.3 V input, 5 V output variant<\/td><\/tr>
        CME0503S3C<\/td>Murata<\/td>5 V input, 3.3 V output variant<\/td><\/tr>
        NME0303SC<\/td>Murata<\/td>1 W version in similar SIP package<\/td><\/tr>
        AM1S-0503SIZ<\/td>Aimtec<\/td>1 W isolated, 5 V input, 3.3 V output<\/td><\/tr>
        IB0303LS-1W<\/td>Mornsun<\/td>1 W SIP4 isolated DC-DC, 3.3 V to 3.3 V<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9611","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=9611"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9611\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9611"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}