{"id":6417,"date":"2026-06-16T03:11:26","date_gmt":"2026-06-16T03:11:26","guid":{"rendered":"https:\/\/materialparts.com\/2n3904\/"},"modified":"2026-06-16T03:11:26","modified_gmt":"2026-06-16T03:11:26","slug":"2n3904","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/2n3904\/","title":{"rendered":"2N3904"},"content":{"rendered":"

Productos<\/h2>\n

The 2N3904 is a general-purpose NPN bipolar junction transistor (BJT) in a TO-92 package. With 40V VCEO, 200mA IC, and 300MHz fT, it is one of the most widely used small-signal transistors for low-power switching, amplification, and signal processing. It is the complementary NPN partner to the 2N3906 PNP.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Polarity<\/td>\nNPN<\/td>\n<\/tr>\n
VCEO<\/td>\n40V<\/td>\n<\/tr>\n
VCBO<\/td>\n60V<\/td>\n<\/tr>\n
VEBO<\/td>\n6V<\/td>\n<\/tr>\n
IC (Collector Current)<\/td>\n200mA (max)<\/td>\n<\/tr>\n
Power Dissipation<\/td>\n625mW<\/td>\n<\/tr>\n
hFE (DC Gain)<\/td>\n100-300<\/td>\n<\/tr>\n
Transition Frequency<\/td>\n300MHz (typ)<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n0.3V (max at IC=50mA)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-55C to +150C<\/td>\n<\/tr>\n
Paquete<\/td>\nTO-92 \/ SOT-23<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Complementary pair with 2N3906 (PNP)<\/li>\n
  • 300MHz transition frequency<\/li>\n
  • Three hFE classifications<\/li>\n
  • Low saturation voltage<\/li>\n
  • Extremely low cost and wide availability<\/li>\n
  • Industry-standard TO-92 pinout<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • General-purpose low-power switching<\/li>\n
    • Small-signal amplification<\/li>\n
    • Logic level translation<\/li>\n
    • Sensor signal conditioning<\/li>\n
    • LED driving<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 2N3904 is a general-purpose NPN bipolar junction transistor (BJT) in a TO-92 package. With 40V VCEO, 200mA IC, and 300MHz fT, it is one of the most widely used small-signal transistors for low-power switching, amplification, and signal processing. It is the complementary NPN partner to the 2N3906 PNP. Key Specifications Polarity NPN […]<\/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":[30,13],"tags":[],"chip_brand":[286],"class_list":["post-6417","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-generic"],"acf":{"brief_explanation":"NPN BJT, 40V, 200mA, hFE 100-300, 300MHz, TO-92, 2N3906 complement","date_code":"","package_case":"TO-92 \/ SOT-23-3","in_stock":500000,"datasheet":"https:\/\/www.onsemi.com\/pdf\/datasheet\/2n3903-d.pdf","price":"$0.01 @ 1ku","product_introduction":"The 2N3904 is a general-purpose NPN bipolar junction transistor in the industry-standard TO-92 package. With 40V collector-emitter voltage, 200mA collector current, and 300MHz transition frequency, it is suitable for a wide range of low-power switching and small-signal amplification applications. The 2N3904 is the complementary NPN partner to the 2N3906 PNP transistor, enabling push-pull amplifier and complementary switch designs. Three hFE classification grades allow designers to select gain matching. The low saturation voltage of 0.3V at 50mA makes it effective as a low-current switch for LEDs, relays, and logic-level translation. It is one of the most produced and lowest-cost transistors available.","working_principle":"The 2N3904 is an NPN bipolar junction transistor. Current flows from collector to emitter when the base is biased positive relative to the emitter by approximately 0.6-0.7V. A small base current (IB) controls a larger collector current (IC) with the ratio IC\/IB = hFE (100-300). In the active region, the transistor acts as a current amplifier. In saturation, both junctions are forward-biased, and VCE drops to the saturation voltage (0.3V max at 50mA). The 300MHz transition frequency indicates the frequency at which hFE drops to unity, supporting RF and high-frequency analog applications. As an NPN device, current sinks from the load through the collector to ground, making it ideal for low-side switching.","pin_description":"
      Pin (TO-92)<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Emitter<\/td>Power<\/td>Emitter; connects to ground in common-emitter<\/td><\/tr>
      2<\/td>Base<\/td>Input<\/td>Base; drive positive relative to emitter to turn on<\/td><\/tr>
      3<\/td>Collector<\/td>Power<\/td>Collector; connects to load<\/td><\/tr><\/table>","application_scenarios":"
      • Small-Signal Amplifier:<\/b> Amplifies audio and sensor signals in common-emitter configuration with hFE up to 300 and 300MHz bandwidth for clean signal reproduction<\/li>
      • Logic-Level Switch:<\/b> Drives LEDs, relays, and small loads from MCU GPIO with 200mA current capability and 0.3V saturation voltage minimizing power loss<\/li>
      • Push-Pull Output Stage:<\/b> Pairs with 2N3906 PNP in Class AB amplifier for headphone or small speaker drivers with complementary symmetry<\/li><\/ul>","alternative_models":"
        Model<\/th>Polarity<\/th>VCEO<\/th>IC<\/th>Key Difference<\/th><\/tr>
        2N3906<\/td>PNP<\/td>-40V<\/td>-200mA<\/td>Complementary PNP<\/td><\/tr>
        BC547B<\/td>NPN<\/td>45V<\/td>100mA<\/td>Higher voltage, lower current<\/td><\/tr>
        S8050<\/td>NPN<\/td>25V<\/td>1.5A<\/td>Higher current, lower voltage<\/td><\/tr>
        2N2222A<\/td>NPN<\/td>40V<\/td>600mA<\/td>Higher current, TO-92<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6417","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=6417"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6417\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=6417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=6417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=6417"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=6417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}