{"id":8981,"date":"2026-07-01T09:37:25","date_gmt":"2026-07-01T09:37:25","guid":{"rendered":"https:\/\/materialparts.com\/lr2512-22r025f4\/"},"modified":"2026-07-03T08:01:54","modified_gmt":"2026-07-03T08:01:54","slug":"lr2512-22r025f4","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lr2512-22r025f4\/","title":{"rendered":"LR2512-22R025F4"},"content":{"rendered":"

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

The LR2512-22R025F4 is a 2512-size current sense chip resistor with 25mΩ resistance, 1% tolerance, ±50ppm\/°C TCR, and 2W power rating. Designed for current detection in power supply protection, battery charge\/discharge control, and motor drive circuits. Available from multiple manufacturers including RALEC, SUSUMU, and TT Electronics IRC.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n
Resistance<\/td>\n25 mΩ<\/td>\n<\/tr>\n
Tolerance<\/td>\n±1% (F)<\/td>\n<\/tr>\n
Power Rating<\/td>\n2 W<\/td>\n<\/tr>\n
TCR<\/td>\n±50 ppm\/°C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n2512 (6.35 x 3.2 mm)<\/td>\n<\/tr>\n
Working Voltage<\/td>\nUp to 200 V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55°C to +170°C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 25mΩ low resistance for current sensing<\/li>\n
  • ±1% tight tolerance for accurate measurement<\/li>\n
  • ±50ppm\/°C low TCR for thermal stability<\/li>\n
  • 2W power rating in 2512 footprint<\/li>\n
  • Thick film technology on alumina substrate<\/li>\n
  • RoHS compliant, halogen free<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • DC-DC converter current sensing<\/li>\n
    • Battery pack charge\/discharge monitoring<\/li>\n
    • Motor drive overcurrent protection<\/li>\n
    • Power supply output current regulation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LR2512-22R025F4 is a 2512-size current sense chip resistor with 25mΩ resistance, 1% tolerance, ±50ppm\/°C TCR, and 2W power rating. Designed for current detection in power supply protection, battery charge\/discharge control, and motor drive circuits. Available from multiple manufacturers including RALEC, SUSUMU, and TT Electronics IRC. Key Specifications Resistance 25 mΩ Tolerance ±1% […]<\/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":[57,13],"tags":[610],"chip_brand":[398],"class_list":["post-8981","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","tag-lr2512-22r025f4","chip_brand-ralec"],"acf":{"brief_explanation":"2512 current sense resistor, 25mΩ, 1%, 2W, ±50ppm\/°C","date_code":"","package_case":"2512 (6.35 x 3.20 x 0.79 mm)","in_stock":8500,"datasheet":"https:\/\/www.ttelectronics.com\/products\/passive-components\/resistors\/lr(f)2512\/","price":"$0.08 @ 1ku","product_introduction":"The LR2512-22R025F4 is a 2512-size surface-mount current sense chip resistor rated at 25 milliohm with ±1% tolerance and ±50ppm\/°C temperature coefficient of resistance. The LR series from TT Electronics IRC uses thick film technology on an alumina substrate with wrap-around electrodes, providing AEC-Q200 qualification for automotive applications. The 2W power rating at 70°C ambient enables current sensing in high-power circuits without excessive surface temperature rise. The low 25mΩ resistance minimizes voltage drop and power loss while providing sufficient signal for current detection amplifiers. The ±1% tolerance ensures measurement accuracy across production lots, and the ±50ppm\/°C TCR maintains stable resistance over the -55°C to +170°C operating range. The 2512 package (6.35 x 3.20mm) is widely available from multiple manufacturers including RALEC and SUSUMU, offering supply chain flexibility. The part number decoding follows the pattern: LR2512 = series and size, 22 = 2512 case, R025 = 0.025Ω resistance, F = ±1% tolerance, 4 = TCR code.","working_principle":"Current sense resistors operate on the basic principle of Ohm law: the voltage drop across the resistor is proportional to the current flowing through it (V = I x R). With a 25mΩ resistance, a 10A load current produces a 250mV voltage drop, which can be amplified by a current-sense amplifier or measured directly by an ADC. The low resistance value is critical because power dissipation scales with the square of current (P = I²R): at 10A, only 2.5W is dissipated in the resistor, well within the 2W rating for typical applications. The thick film element is screen-printed onto the alumina substrate and laser-trimmed to achieve the ±1% tolerance. The wrap-around electrode structure provides a robust solder joint and low parasitic inductance, which is essential for high-frequency switching applications. The TCR of ±50ppm\/°C means the resistance changes by only 0.5% over a 100°C temperature swing, ensuring measurement accuracy in thermally varying environments.","pin_description":"
      Terminal<\/th>Description<\/th><\/tr>
      1<\/td>Current sense terminal (Kelvin sense point near resistor element)<\/td><\/tr>
      2<\/td>Current sense terminal (Kelvin sense point near resistor element)<\/td><\/tr><\/table>","application_scenarios":"
      • DC-DC buck converter output current limiting with 25mΩ sense resistor and current-sense amplifier<\/li>\n
      • Li-ion battery pack charge\/discharge current monitoring in BMS systems<\/li>\n
      • BLDC motor drive overcurrent detection with fast comparator trip at 250mV threshold<\/li>\n
      • Server power supply hot-swap current limiting using 25mΩ sense element<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        WSL2512R025FEA<\/td>Vishay Dale<\/td>Metal strip, lower TCR<\/td><\/tr>
        CRL2512-FW-R025ELF<\/td>Bourns<\/td>Similar thick film<\/td><\/tr>
        LR2512-22R025G4<\/td>RALEC<\/td>2% tolerance, lower cost<\/td><\/tr>
        KRL6432E-C-R025-F-T1<\/td>SUSUMU<\/td>Metal foil, AEC-Q200<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8981","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=8981"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8981\/revisions"}],"predecessor-version":[{"id":9058,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8981\/revisions\/9058"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=8981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=8981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=8981"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=8981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}