{"id":6416,"date":"2026-06-16T03:08:37","date_gmt":"2026-06-16T03:08:37","guid":{"rendered":"https:\/\/materialparts.com\/s8550\/"},"modified":"2026-06-16T03:08:37","modified_gmt":"2026-06-16T03:08:37","slug":"s8550","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/s8550\/","title":{"rendered":"S8550"},"content":{"rendered":"

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

The S8550 is a general-purpose PNP bipolar junction transistor (BJT) in a TO-92 or SOT-23 package. With -25V VCEO, -1.5A IC, and 100MHz fT, it is one of the most widely used PNP transistors for low-power switching, amplification, and complementary push-pull circuits paired with the NPN S8050.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u6781\u6027<\/td>\nPNP<\/td>\n<\/tr>\n
VCEO (Collector-Emitter)<\/td>\n-25V<\/td>\n<\/tr>\n
VCBO (Collector-Base)<\/td>\n-30V<\/td>\n<\/tr>\n
VEBO (Emitter-Base)<\/td>\n-5V<\/td>\n<\/tr>\n
IC\uff08\u96c6\u7535\u6781\u7535\u6d41\uff09<\/td>\n-1.5A (max)<\/td>\n<\/tr>\n
\u529f\u7387\u8017\u6563<\/td>\n1W (TO-92)<\/td>\n<\/tr>\n
hFE (DC Gain)<\/td>\n85-300 (classified by suffix)<\/td>\n<\/tr>\n
Transition Frequency<\/td>\n100MHz (typ)<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n-0.5V (max at IC=-500mA)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55C to +150C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTO-92 \/ SOT-23<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Complementary pair with S8050 (NPN)<\/li>\n
  • High current capability: -1.5A<\/li>\n
  • 100MHz transition frequency<\/li>\n
  • Three hFE classifications (B, C, D)<\/li>\n
  • Low saturation voltage: -0.5V<\/li>\n
  • Low cost and wide availability<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Low-power switching<\/li>\n
    • Audio amplification (push-pull)<\/li>\n
    • Motor drive (low power)<\/li>\n
    • LED driving<\/li>\n
    • General-purpose amplification<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The S8550 is a general-purpose PNP bipolar junction transistor (BJT) in a TO-92 or SOT-23 package. With -25V VCEO, -1.5A IC, and 100MHz fT, it is one of the most widely used PNP transistors for low-power switching, amplification, and complementary push-pull circuits paired with the NPN S8050. Key Specifications Polarity PNP VCEO (Collector-Emitter) […]<\/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-6416","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-generic"],"acf":{"brief_explanation":"PNP BJT, -25V, -1.5A, hFE 85-300, 100MHz, TO-92\/SOT-23, S8050 complement","date_code":"","package_case":"TO-92 \/ SOT-23-3","in_stock":200000,"datasheet":"https:\/\/www.mccsemi.com\/pdf\/Transistor\/S8550(SOT-23).pdf","price":"$0.01 @ 1ku","product_introduction":"The S8550 is a general-purpose PNP bipolar junction transistor commonly available in TO-92 through-hole and SOT-23 surface-mount packages. With a -25V collector-emitter voltage rating, -1.5A continuous collector current, and 100MHz transition frequency, it is suitable for a wide range of low-power switching and amplification applications. The S8550 is the complementary PNP partner to the S8050 NPN transistor, enabling push-pull amplifier and complementary switch designs. Three hFE classification grades (B: 85-160, C: 120-200, D: 160-300) allow designers to select gain matching for specific circuits. The low saturation voltage of -0.5V at 500mA makes it effective as a low-side or high-side switch for LEDs, relays, and small motors.","working_principle":"The S8550 is a PNP bipolar junction transistor. Current flows from emitter to collector when the base is biased negative 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 (DC current gain, 85-300 depending on grade). In the active region, the transistor acts as a current amplifier. In saturation, both the base-emitter and base-collector junctions are forward-biased, and VCE drops to the saturation voltage (-0.5V max at 500mA). The 100MHz transition frequency (fT) indicates the frequency at which hFE drops to unity, supporting audio and moderate-frequency applications. As a PNP device, the S8550 sources current from the positive supply through the load, making it ideal for high-side switching and complementary push-pull output stages.","pin_description":"
      Pin (TO-92)<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Emitter<\/td>Power<\/td>Emitter; connects to positive supply in common-emitter<\/td><\/tr>
      2<\/td>Collector<\/td>Power<\/td>Collector; connects to load<\/td><\/tr>
      3<\/td>Base<\/td>Input<\/td>Base; drive negative relative to emitter to turn on<\/td><\/tr><\/table>","application_scenarios":"
      • Push-Pull Audio Amplifier:<\/b> Pairs with S8050 NPN in Class AB push-pull output stage for small speaker amplifiers with complementary symmetry reducing crossover distortion<\/li>
      • High-Side Load Switch:<\/b> Connects emitter to positive supply, collector to load, and base drive through a resistor from MCU GPIO to control LEDs, buzzers, or small motors sourcing up to 1.5A<\/li>
      • Signal Amplification:<\/b> Amplifies audio and sensor signals in common-emitter or common-base configurations with hFE up to 300 and 100MHz bandwidth<\/li><\/ul>","alternative_models":"
        Model<\/th>Polarity<\/th>VCEO<\/th>IC<\/th>Key Difference<\/th><\/tr>
        S8050<\/td>NPN<\/td>25V<\/td>1.5A<\/td>Complementary NPN pair<\/td><\/tr>
        2N3906<\/td>PNP<\/td>-40V<\/td>-200mA<\/td>Lower current, higher voltage<\/td><\/tr>
        BC557B<\/td>PNP<\/td>-45V<\/td>-100mA<\/td>Higher voltage, lower current<\/td><\/tr>
        BD140<\/td>PNP<\/td>-80V<\/td>-1.5A<\/td>Higher voltage, TO-126<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6416","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=6416"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6416\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6416"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}