{"id":10979,"date":"2026-07-21T12:18:17","date_gmt":"2026-07-21T12:18:17","guid":{"rendered":"https:\/\/ic-vendor.com\/pwr12jtfa4r70\/"},"modified":"2026-07-21T12:18:17","modified_gmt":"2026-07-21T12:18:17","slug":"pwr12jtfa4r70","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/ar\/pwr12jtfa4r70\/","title":{"rendered":"PWR12JTFA4R70"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The PWR12JTFA4R70 from Bourns is a 4.7\u03a9 \u00b15% wirewound power resistor rated at 12W, designed for high-power dissipation in industrial power supplies, motor drives, and power electronics. The cement-coated wirewound construction provides excellent pulse withstanding and reliable operation in harsh environments.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n
Resistance<\/td>\n4.7\u03a9<\/td>\n<\/tr>\n
Tolerance<\/td>\n\u00b15% (J)<\/td>\n<\/tr>\n
Power Rating<\/td>\n12W<\/td>\n<\/tr>\n
Temperature Coefficient<\/td>\n\u00b1200ppm\/\u00b0C<\/td>\n<\/tr>\n
Mounting<\/td>\nThrough-Hole (Axial)<\/td>\n<\/tr>\n
Technology<\/td>\nWirewound (Cement Coated)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-55\u00b0C to +250\u00b0C (at rated load derating)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 12W power rating for high-power dissipation applications<\/li>\n
  • Wirewound construction for excellent pulse withstanding capability<\/li>\n
  • Cement coating for high-temperature operation and flame retardancy<\/li>\n
  • 4.7\u03a9 low resistance for current limiting and load bank applications<\/li>\n
  • Axial through-hole mounting for easy heatsink integration<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Power supply inrush current limiting<\/li>\n
    • Motor drive braking resistor<\/li>\n
    • Capacitor discharge and snubber network<\/li>\n
    • Load testing and dummy load<\/li>\n
    • Industrial heater and power resistor bank<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The PWR12JTFA4R70 from Bourns is a 4.7\u03a9 \u00b15% wirewound power resistor rated at 12W, designed for high-power dissipation in industrial power supplies, motor drives, and power electronics. The cement-coated wirewound construction provides excellent pulse withstanding and reliable operation in harsh environments. Key Specifications Resistance 4.7\u03a9 Tolerance \u00b15% (J) Power Rating 12W Temperature Coefficient […]<\/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":[2304],"chip_brand":[220],"class_list":["post-10979","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","tag-pwr12jtfa4r70","chip_brand-bourns"],"acf":{"brief_explanation":"4.7\u03a9 5% 12W wirewound power resistor, axial, cement coated","date_code":"","package_case":"Axial Leaded Wirewound - 37 x 9.5mm body","in_stock":4435,"datasheet":"https:\/\/www.bourns.com\/products\/resistors\/power-resistors\/pwr-series","price":"$0.50 @ 1ku","product_introduction":"The PWR12JTFA4R70 from Bourns is a 4.7\u03a9 \u00b15% wirewound power resistor rated at 12W, part of the PWR series. The wirewound construction uses a resistance wire wound on a ceramic core, providing excellent pulse withstanding capability and high-temperature operation. The cement coating provides mechanical protection and flame retardancy (UL 94V-0). The 4.7\u03a9 low resistance at 12W power rating makes this device suitable for inrush current limiting, motor braking, capacitor discharge, and other high-power applications. The axial through-hole package allows mounting on heatsinks or in airflow for improved thermal management.","working_principle":"The PWR12JTFA4R70 uses a wirewound resistive element consisting of a resistance alloy wire (typically NiCr or CuNi) wound on a ceramic core. The wire gauge and number of turns are selected to achieve the target 4.7\u03a9 resistance. The wirewound construction inherently provides high energy handling capability, as the resistive element has a large thermal mass compared to thin film or thick film technologies. The cement coating provides electrical insulation, mechanical protection, and thermal conduction from the wire element to the external surface. The device can withstand short-duration power pulses far exceeding the 12W continuous rating due to the thermal mass of the wirewound element.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>Lead 1<\/td>Passive<\/td>Axial lead; solder to PCB or terminal block<\/td><\/tr>\n
      2<\/td>Lead 2<\/td>Passive<\/td>Axial lead; solder to PCB or terminal block<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Switch-mode power supply NTC bypass relay-delay resistor for inrush current limiting<\/li>\n
      • Servo motor dynamic braking resistor for deceleration energy absorption<\/li>\n
      • Capacitor bank discharge resistor for high-voltage power supply safety<\/li>\n
      • Load bank and dummy load for power supply testing<\/li>\n
      • Industrial heater element current limiting resistor<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        Bourns<\/td>PWR263S-35-4R70F<\/td>SMD D2PAK<\/td>4.7\u03a9 35W SMD power<\/td><\/tr>\n
        Vishay<\/td>RH0504R700FE02<\/td>Axial<\/td>4.7\u03a9 50W wirewound<\/td><\/tr>\n
        Ohmite<\/td>HS25-4R7F<\/td>Axial<\/td>4.7\u03a9 25W wirewound<\/td><\/tr>\n
        TE Connectivity<\/td>HS50-4R7-F<\/td>Axial<\/td>4.7\u03a9 50W aluminum housed<\/td><\/tr>\n
        YAGEO<\/td>SQP500JB-4R7<\/td>Axial<\/td>4.7\u03a9 5W ceramic<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10979","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/comments?post=10979"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10979\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/media?parent=10979"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/categories?post=10979"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/tags?post=10979"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=10979"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}