{"id":6418,"date":"2026-06-16T03:11:27","date_gmt":"2026-06-16T03:11:27","guid":{"rendered":"https:\/\/materialparts.com\/bc547b\/"},"modified":"2026-06-16T03:11:27","modified_gmt":"2026-06-16T03:11:27","slug":"bc547b","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/bc547b\/","title":{"rendered":"BC547B"},"content":{"rendered":"

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

The BC547B is a general-purpose NPN bipolar junction transistor in a TO-92 package. With 45V VCEO, 100mA IC, and 300MHz fT, it is widely used in European and international designs for small-signal amplification and low-power switching. The B suffix indicates hFE classification of 200-450.<\/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\n\n\n\n
\u0627\u0644\u0642\u0637\u0628\u064a\u0629<\/td>\nNPN<\/td>\n<\/tr>\n
VCEO<\/td>\n45V<\/td>\n<\/tr>\n
VCBO<\/td>\n50V<\/td>\n<\/tr>\n
VEBO<\/td>\n6V<\/td>\n<\/tr>\n
IC (\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062c\u0645\u0639)<\/td>\n100mA (max)<\/td>\n<\/tr>\n
\u062a\u0628\u062f\u064a\u062f \u0627\u0644\u0637\u0627\u0642\u0629<\/td>\n500mW<\/td>\n<\/tr>\n
hFE (DC Gain)<\/td>\n200-450 (B suffix)<\/td>\n<\/tr>\n
Transition Frequency<\/td>\n300MHz (typ)<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n0.6V (max at IC=100mA)<\/td>\n<\/tr>\n
Noise Figure<\/td>\n10dB (typ at 1kHz)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-65C to +150C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTO-92<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Complementary pair with BC557B (PNP)<\/li>\n
  • Three hFE grades: A (110-220), B (200-450), C (420-800)<\/li>\n
  • 300MHz transition frequency<\/li>\n
  • Low noise variant (BC549B) available<\/li>\n
  • Industry-standard TO-92 (E-line) pinout<\/li>\n
  • Wide operating temperature range<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Small-signal audio amplification<\/li>\n
    • General-purpose switching<\/li>\n
    • Sensor signal conditioning<\/li>\n
    • Logic interface circuits<\/li>\n
    • Oscillator circuits<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BC547B is a general-purpose NPN bipolar junction transistor in a TO-92 package. With 45V VCEO, 100mA IC, and 300MHz fT, it is widely used in European and international designs for small-signal amplification and low-power switching. The B suffix indicates hFE classification of 200-450. Key Specifications Polarity NPN VCEO 45V VCBO 50V VEBO […]<\/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-6418","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-generic"],"acf":{"brief_explanation":"NPN BJT, 45V, 100mA, hFE 200-450 (B grade), 300MHz, TO-92","date_code":"","package_case":"TO-92 (5.20 x 4.20 x 5.30 mm, E-line)","in_stock":300000,"datasheet":"https:\/\/www.onsemi.com\/pdf\/datasheet\/bc546b-d.pdf","price":"$0.01 @ 1ku","product_introduction":"The BC547B is a general-purpose NPN bipolar junction transistor in the industry-standard TO-92 E-line package. With 45V collector-emitter voltage, 100mA collector current, and 300MHz transition frequency, it is a versatile small-signal transistor. The B suffix indicates a medium hFE range of 200-450, offering good gain for amplification while maintaining stability. It is the complementary NPN partner to the BC557B PNP transistor. The BC547 series offers three gain grades (A, B, C) for design flexibility. A low-noise variant (BC549B) is available for audio preamplifier applications. The BC547B is one of the most commonly used transistors in European electronics design.","working_principle":"The BC547B is an NPN bipolar junction transistor. Current flows from collector to emitter when the base-emitter junction is forward-biased at approximately 0.6-0.7V. The base current IB controls a larger collector current IC with IC\/IB = hFE (200-450 for B grade). In the active region, it acts as a current amplifier. In saturation, VCE drops to 0.6V max at 100mA. The 300MHz transition frequency supports moderate-frequency and audio applications. The TO-92 E-line package has the collector connected to the center pin and metal tab, providing slightly better thermal dissipation than standard TO-92 configurations.","pin_description":"
      Pin (TO-92)<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Collector<\/td>Power<\/td>Collector; connects to load<\/td><\/tr>
      2<\/td>Base<\/td>Input<\/td>Base; drive positive relative to emitter to turn on<\/td><\/tr>
      3<\/td>Emitter<\/td>Power<\/td>Emitter; connects to ground in common-emitter<\/td><\/tr><\/table>","application_scenarios":"
      • Audio Preamp:<\/b> Amplifies microphone and instrument signals with hFE of 200-450 providing sufficient gain for line-level output in preamplifier stages<\/li>
      • Sensor Signal Buffer:<\/b> Conditions sensor outputs in common-collector (emitter follower) configuration providing impedance transformation without voltage gain<\/li>
      • Logic Interface:<\/b> Translates 3.3V logic to 5V or drives small loads from MCU GPIO with 100mA sink capability and 45V voltage headroom<\/li><\/ul>","alternative_models":"
        Model<\/th>Polarity<\/th>VCEO<\/th>IC<\/th>Key Difference<\/th><\/tr>
        BC557B<\/td>PNP<\/td>-45V<\/td>-100mA<\/td>Complementary PNP<\/td><\/tr>
        BC549B<\/td>NPN<\/td>30V<\/td>100mA<\/td>Lower noise version<\/td><\/tr>
        2N3904<\/td>NPN<\/td>40V<\/td>200mA<\/td>Higher current, US standard<\/td><\/tr>
        BC847B<\/td>NPN<\/td>45V<\/td>100mA<\/td>SOT-23 surface-mount<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6418","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6418"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6418\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6418"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6418"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}