{"id":10597,"date":"2026-07-20T06:38:43","date_gmt":"2026-07-20T06:38:43","guid":{"rendered":"https:\/\/ic-vendor.com\/b59840c0120a070\/"},"modified":"2026-07-20T06:38:43","modified_gmt":"2026-07-20T06:38:43","slug":"b59840c0120a070","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/ar\/b59840c0120a070\/","title":{"rendered":"B59840C0120A070"},"content":{"rendered":"

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

The B59840C0120A070 from TDK\/EPCOS is a PTC thermistor (Positive Temperature Coefficient) designed for overcurrent protection and inrush current limiting applications. It features a rated switching temperature of 120\u00b0C and is packaged in a radial leaded disc form factor. The device provides self-resetting protection against overcurrent and overtemperature conditions.<\/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\n
\u0627\u0644\u0646\u0648\u0639<\/td>\nPTC Thermistor (overcurrent protection)<\/td>\n<\/tr>\n
Rated Switching Temperature<\/td>\n120\u00b0C<\/td>\n<\/tr>\n
R25 (Resistance at 25\u00b0C)<\/td>\nRefer to specific part variant<\/td>\n<\/tr>\n
Maximum Operating Voltage<\/td>\nRefer to specific part variant<\/td>\n<\/tr>\n
Maximum Current<\/td>\nRefer to specific part variant<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-25\u00b0C to +85\u00b0C (continuous)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nRadial leaded disc<\/td>\n<\/tr>\n
Lead Material<\/td>\nTinned copper<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Self-resetting overcurrent and overtemperature protection<\/li>\n
  • Rated switching temperature: 120\u00b0C<\/li>\n
  • No mechanical contacts for reliable operation<\/li>\n
  • Radial leaded disc package for through-hole mounting<\/li>\n
  • Low resistance in normal operating condition<\/li>\n
  • Rapid response to overcurrent events<\/li>\n
  • RoHS compliant<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Overcurrent protection in power supplies<\/li>\n
    • Inrush current limiting for capacitive loads<\/li>\n
    • Motor protection circuits<\/li>\n
    • Transformer overtemperature protection<\/li>\n
    • LED lighting driver protection<\/li>\n
    • Heater element temperature control<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The B59840C0120A070 from TDK\/EPCOS is a PTC thermistor (Positive Temperature Coefficient) designed for overcurrent protection and inrush current limiting applications. It features a rated switching temperature of 120\u00b0C and is packaged in a radial leaded disc form factor. The device provides self-resetting protection against overcurrent and overtemperature conditions. Key Specifications Type PTC Thermistor […]<\/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":[1935],"chip_brand":[205],"class_list":["post-10597","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","tag-b59840c0120a070","chip_brand-tdk"],"acf":{"brief_explanation":"PTC thermistor for overcurrent protection, 120\u00b0C switching temp, radial disc","date_code":"","package_case":"Radial leaded disc","in_stock":4567,"datasheet":"https:\/\/www.tdk-electronics.tdk.com\/inf\/55\/db\/PTC\/PTC_OC_Leaded.pdf","price":"$0.35 @ 1ku","product_introduction":"The B59840C0120A070 from TDK\/EPCOS is a PTC (Positive Temperature Coefficient) thermistor designed for overcurrent protection and inrush current limiting. The device operates on the principle that its resistance increases sharply when the temperature exceeds a rated switching threshold (120\u00b0C). In normal operation, the PTC has low resistance, allowing current to pass freely. When an overcurrent condition causes self-heating (or an external overtemperature condition occurs), the PTC resistance increases dramatically, effectively limiting the current to a safe level. Once the fault condition is removed and the device cools, the resistance returns to its low value, automatically resetting the protection without manual intervention. The radial leaded disc package is suitable for through-hole PCB mounting.","working_principle":"The B59840C0120A070 operates through the PTC effect of barium titanate ceramic:\n\n1. Normal Operation (Low Resistance): Below the Curie temperature, the barium titanate ceramic is in its ferroelectric phase with low resistivity. Current flows through the device with minimal voltage drop, allowing normal circuit operation.\n\n2. Fault Condition (High Resistance): When overcurrent causes self-heating (I\u00b2R heating) or external temperature rises above the switching threshold (120\u00b0C), the ceramic undergoes a phase transition from ferroelectric to paraelectric state. The resistance increases by several orders of magnitude (typically 3-5 decades), limiting the current to a small holding current.\n\n3. Self-Resetting: When the fault is removed and the device cools below the switching temperature, the resistance gradually returns to its original low value. This self-resetting characteristic eliminates the need for fuses or manual reset mechanisms.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Lead 1<\/td>Passive<\/td>Terminal 1 (no polarity)<\/td><\/tr>
      2<\/td>Lead 2<\/td>Passive<\/td>Terminal 2 (no polarity)<\/td><\/tr><\/table>","application_scenarios":"
      • Power supply protection: Self-resetting overcurrent protection in AC\/DC power supplies and adapters eliminates fuse replacement after transient faults<\/li>
      • Inrush current limiting: Limits surge current into capacitive loads (e.g., switch-mode power supply input capacitors) during power-on, then returns to low resistance for normal operation<\/li>
      • Motor protection: Protects small DC motors from stall-induced overcurrent conditions by limiting fault current when motor windings heat up<\/li>
      • LED driver protection: Overtemperature protection in LED lighting drivers where the PTC is thermally coupled to the LED board for junction temperature monitoring<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TDK\/EPCOS<\/td>B59840C0080A070<\/td>Radial disc<\/td>80\u00b0C switching temperature<\/td><\/tr>
        TDK\/EPCOS<\/td>B59840C0160A070<\/td>Radial disc<\/td>160\u00b0C switching temperature<\/td><\/tr>
        Murata<\/td>PRG18BB331MB1RB<\/td>SMD 0603<\/td>PTC resettable fuse, SMD<\/td><\/tr>
        Littelfuse<\/td>polyZen<\/td>SMD<\/td>PTC + Zener for LED protection<\/td><\/tr>
        Bourns<\/td>MF-RG700<\/td>Radial<\/td>7A hold current, resettable<\/td><\/tr>
        TE Connectivity<\/td>30R070L<\/td>Radial<\/td>0.7A hold, resettable fuse<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10597","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=10597"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10597\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/media?parent=10597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/categories?post=10597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/tags?post=10597"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=10597"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}