{"id":3383,"date":"2026-06-03T06:42:15","date_gmt":"2026-06-03T06:42:15","guid":{"rendered":"https:\/\/materialparts.com\/rt9728bhgqw\/"},"modified":"2026-06-03T06:42:15","modified_gmt":"2026-06-03T06:42:15","slug":"rt9728bhgqw","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/rt9728bhgqw\/","title":{"rendered":"RT9728BHGQW"},"content":{"rendered":"

Productos<\/h2>\n

The RT9728BHGQW from Richtek is a 120m\u03a9 P-MOSFET high-side power switch with adjustable current limit in a WDFN-6 (2x2mm) package. Designed for USB power distribution, it supports 75mA to 1.8A programmable current limiting with \u00b110% accuracy, built-in soft-start, and fault flag output.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Switch Type<\/td>\nP-Channel MOSFET (high-side)<\/td>\n<\/tr>\n
RDS(on) Typical<\/td>\n120 m\u03a9<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n1.8 A<\/td>\n<\/tr>\n
Adjustable Current Limit Range<\/td>\n75 mA to 1.8 A (via RILIM resistor)<\/td>\n<\/tr>\n
Current Limit Accuracy<\/td>\n\u00b110%<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n2.5V to 5.5V<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n120 \u00b5A typical<\/td>\n<\/tr>\n
Shutdown Current<\/td>\n1 \u00b5A max<\/td>\n<\/tr>\n
Fault Flag Output<\/td>\nYes (active low, open-drain)<\/td>\n<\/tr>\n
Soft-Start<\/td>\nBuilt-in<\/td>\n<\/tr>\n
ESD Protection<\/td>\n15 kV IEC 61000-4-2 (with ext. cap)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40 to +125\u00b0C (TJ)<\/td>\n<\/tr>\n
Paquete<\/td>\nWDFN-6L (2x2mm, exposed pad)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 120m\u03a9 low on-resistance P-MOSFET switch<\/li>\n
  • Adjustable current limit: 75mA to 1.8A via external resistor<\/li>\n
  • \u00b110% current limit accuracy<\/li>\n
  • Meets USB current limiting requirements<\/li>\n
  • Built-in soft-start to limit inrush current<\/li>\n
  • Active-high enable input<\/li>\n
  • Fault flag output (open-drain)<\/li>\n
  • Reverse input-output voltage protection<\/li>\n
  • Under-voltage lockout (UVLO)<\/li>\n
  • Thermal shutdown protection<\/li>\n
  • 15kV ESD protection (IEC 61000-4-2)<\/li>\n
  • Nemko IEC 62368-1 approved<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • USB bus\/self-powered hub ports<\/li>\n
    • USB peripheral power distribution<\/li>\n
    • ACPI power distribution<\/li>\n
    • Battery-powered equipment<\/li>\n
    • Set-top boxes and 3G data cards<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The RT9728BHGQW from Richtek is a 120m\u03a9 P-MOSFET high-side power switch with adjustable current limit in a WDFN-6 (2x2mm) package. Designed for USB power distribution, it supports 75mA to 1.8A programmable current limiting with \u00b110% accuracy, built-in soft-start, and fault flag output. Key Specifications Switch Type P-Channel MOSFET (high-side) RDS(on) Typical 120 m\u03a9 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[36,13],"tags":[],"chip_brand":[203],"class_list":["post-3383","post","type-post","status-publish","format-standard","hentry","category-gate-driver-ics","category-integrated-circuits-ics","chip_brand-richtek"],"acf":{"brief_explanation":"120mOhm USB power switch, adj 75mA-1.8A OCP, WDFN-6 (2x2mm)","date_code":"","package_case":"WDFN-6L \/ HGQW-6 (2.0 x 2.0 x 0.75mm, 0.65mm pitch, exposed pad)","in_stock":1846,"datasheet":"https:\/\/www.richtek.com\/assets\/product_file\/RT9728B\/DS9728B-05.pdf","price":"$0.28 @ 1ku","product_introduction":"The RT9728BHGQW from Richtek is a 120m\u03a9 P-MOSFET high-side power switch with adjustable current limiting in WDFN-6 (2x2mm). Supports 75mA to 1.8A programmable current limit via external RILIM resistor with \u00b110% accuracy. 2.5-5.5V input range, 120\u00b5A quiescent current, built-in soft-start, fault flag output, and 15kV ESD protection. HGQW suffix denotes WDFN-6 2x2mm tape-and-reel. Ideal for USB port power distribution and hot-plug applications.","working_principle":"The RT9728B uses an internal P-channel MOSFET as the high-side switch between VIN and VOUT. The current limit is set by connecting an external resistor (RILIM) from the ILIM pin to ground. The internal current sense circuit mirrors a fraction of the load current and compares it against the ILIM reference. When the load current exceeds the set threshold, the switch enters constant-current mode, limiting the output current and asserting the FAULT flag (open-drain, active low). The built-in soft-start circuit ramps the output voltage gradually to limit inrush current into capacitive loads. UVLO disables the switch when VIN drops below 2.2V. Thermal shutdown protects the device at approximately 140\u00b0C junction temperature.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>OUT<\/td>Output<\/td>Switch output (to load)<\/td><\/tr>
      2<\/td>GND<\/td>Ground<\/td>Ground<\/td><\/tr>
      3<\/td>EN<\/td>Input<\/td>Enable (active high)<\/td><\/tr>
      4<\/td>ILIM<\/td>Input<\/td>Current limit set (resistor to GND, or connect to VIN for 75mA)<\/td><\/tr>
      5<\/td>FAULT#<\/td>Output<\/td>Fault flag (open-drain, active low)<\/td><\/tr>
      6<\/td>IN<\/td>Power<\/td>Input supply (2.5-5.5V)<\/td><\/tr><\/table>","application_scenarios":"
      • USB 2.0 port power switch with 500mA current limit<\/li>
      • USB 3.0 port with 900mA current limit<\/li>
      • Hot-plug power distribution for PC peripheral bays<\/li>
      • Battery-powered device load switch with current protection<\/li>
      • Set-top box USB port with adjustable current limit<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Richtek<\/td>RT9728BHGE<\/td>SOT-23-6<\/td>SOT-23-6 package version<\/td><\/tr>
        TI<\/td>TPS2041BDRB<\/td>SOT-23-5<\/td>Similar USB power switch<\/td><\/tr>
        onsemi<\/td>NCP380LSNAJAAT1G<\/td>WDFN-6<\/td>Adjustable OCP, similar package<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3383","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=3383"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3383\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=3383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=3383"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=3383"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=3383"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}