{"id":9662,"date":"2026-07-05T09:06:43","date_gmt":"2026-07-05T09:06:43","guid":{"rendered":"https:\/\/materialparts.com\/hfd42-12-3sr\/"},"modified":"2026-07-05T09:06:43","modified_gmt":"2026-07-05T09:06:43","slug":"hfd42-12-3sr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/hfd42-12-3sr\/","title":{"rendered":"HFD42\/12-3SR"},"content":{"rendered":"

Productos<\/h2>\n

The HFD42\/12-3SR is an ultra-compact signal relay from Xiamen Hongfa, featuring 12VDC coil voltage with DPDT (2 Form C) contact arrangement, 4A maximum switching current, and SMD gull-wing termination. With an ultra-narrow 5.7mm width, it is designed for high-density PCB mounting in communication and industrial equipment.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Coil Voltage<\/td>\n12 VDC<\/td>\n<\/tr>\n
Coil Resistance<\/td>\n1028 Ohms<\/td>\n<\/tr>\n
Contact Form<\/td>\nDPDT (2 Form C)<\/td>\n<\/tr>\n
Max Switching Current<\/td>\n4A (DC), 1A (AC)<\/td>\n<\/tr>\n
Max Switching Voltage<\/td>\n220VDC \/ 250VAC<\/td>\n<\/tr>\n
Max Switching Power<\/td>\n60W (DC) \/ 62.5VA (AC)<\/td>\n<\/tr>\n
Operate Time<\/td>\n3 ms (max)<\/td>\n<\/tr>\n
Release Time<\/td>\n3 ms (max)<\/td>\n<\/tr>\n
Mechanical Life<\/td>\n100,000,000 operations<\/td>\n<\/tr>\n
Electrical Life<\/td>\n100,000 operations<\/td>\n<\/tr>\n
Surge Voltage (coil-contact)<\/td>\n2.5 kV<\/td>\n<\/tr>\n
Paquete<\/td>\n10.6 x 7.4 x 9.7 mm (SMD)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40C to +85C<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Ultra-narrow 5.7mm width for high-density PCB mounting<\/li>\n
  • Coil-contact surge voltage rating of 2.5kV for reinforced insulation<\/li>\n
  • Gold-plated AgNi contacts for reliable low-level signal switching<\/li>\n
  • Sealed plastic housing compatible with reflow soldering<\/li>\n
  • Fast 3ms operate\/release time for high-speed signal routing<\/li>\n
  • 100 million mechanical operations for long service life<\/li>\n
  • Compliant with IEC 62368-1 safety standard<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Program-controlled telephone exchange systems<\/li>\n
    • Industrial automation and ATE signal switching<\/li>\n
    • Office automation and security monitoring<\/li>\n
    • Temperature control and instrumentation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The HFD42\/12-3SR is an ultra-compact signal relay from Xiamen Hongfa, featuring 12VDC coil voltage with DPDT (2 Form C) contact arrangement, 4A maximum switching current, and SMD gull-wing termination. With an ultra-narrow 5.7mm width, it is designed for high-density PCB mounting in communication and industrial equipment. Key Specifications Coil Voltage 12 VDC Coil […]<\/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":[13,20],"tags":[938],"chip_brand":[308],"class_list":["post-9662","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-hfd42-12-3sr","chip_brand-hongfa"],"acf":{"brief_explanation":"12VDC DPDT signal relay, 4A, SMD gull-wing, 10.6x7.4mm, 2.5kV surge, sealed","date_code":"","package_case":"SMD Gull-wing (10.6 x 7.4 x 9.7 mm)","in_stock":3350,"datasheet":"https:\/\/www.hongfa.cn\/Product\/Detail\/HFD42_24-3","price":"$1.35 @ 1ku","product_introduction":"The Hongfa HFD42\/12-3SR is a 4th-generation ultra-compact signal relay featuring a 12VDC coil and DPDT (2 Form C) contact arrangement in a surface-mount gull-wing package. With an ultra-narrow width of just 5.7mm, the HFD42 enables high-density relay packing on PCBs. The 4A maximum switching current with AgNi gold-plated contacts ensures reliable switching for both low-level analog signals and moderate power loads. The coil-to-contact surge voltage rating of 2.5kV provides reinforced insulation. The sealed plastic housing protects contacts from flux and cleaning agent ingress during PCB assembly, and the SMD gull-wing termination is compatible with lead-free reflow soldering profiles.","working_principle":"The HFD42\/12-3SR is a monostable electromagnetic relay. When 12VDC is applied across the coil terminals, the resulting magnetic field pulls the armature toward the core, transferring the contact springs to change NC contacts to open and NO contacts to closed. When coil voltage is removed, the return spring restores the original contact state. The DPDT configuration provides two independent single-pole double-throw switching elements. The AgNi contact material with gold plating provides low and stable contact resistance for both dry-circuit and power switching applications.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Coil+<\/td>Input<\/td>Coil positive terminal (12VDC)<\/td><\/tr>
      2<\/td>Coil-<\/td>Input<\/td>Coil negative terminal<\/td><\/tr>
      3<\/td>COM1<\/td>Contact<\/td>Contact 1 common<\/td><\/tr>
      4<\/td>NO1<\/td>Contact<\/td>Contact 1 normally-open<\/td><\/tr>
      5<\/td>NC1<\/td>Contact<\/td>Contact 1 normally-closed<\/td><\/tr>
      6<\/td>COM2<\/td>Contact<\/td>Contact 2 common<\/td><\/tr>
      7<\/td>NO2<\/td>Contact<\/td>Contact 2 normally-open<\/td><\/tr>
      8<\/td>NC2<\/td>Contact<\/td>Contact 2 normally-closed<\/td><\/tr><\/table>","application_scenarios":"
      • Program-controlled telephone exchange signal routing<\/li>
      • Industrial automation PLC output modules and signal multiplexing<\/li>
      • ATE signal path switching<\/li>
      • Security monitoring system alarm relay contacts<\/li>
      • Temperature control and HVAC relay interfaces<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Hongfa<\/td>HFD42\/5-3SR<\/td>SMD<\/td>5VDC coil variant<\/td><\/tr>
        Hongfa<\/td>HFD42\/24-3SR<\/td>SMD<\/td>24VDC coil variant<\/td><\/tr>
        Omron<\/td>G6K-2F-Y 12VDC<\/td>SMD<\/td>DPDT signal relay, similar size<\/td><\/tr>
        TE<\/td>IM03GR 12VDC<\/td>SMD<\/td>DPDT signal relay, compact<\/td><\/tr>
        Panasonic<\/td>TX2SA-12V<\/td>SMD<\/td>DPDT 2A signal relay<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9662","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=9662"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9662\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=9662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=9662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=9662"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=9662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}