{"id":7955,"date":"2026-06-28T06:10:18","date_gmt":"2026-06-28T06:10:18","guid":{"rendered":"https:\/\/materialparts.com\/ss8050\/"},"modified":"2026-06-28T11:37:43","modified_gmt":"2026-06-28T11:37:43","slug":"ss8050","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ss8050\/","title":{"rendered":"SS8050"},"content":{"rendered":"

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

The SS8050 from onsemi is a medium-power NPN transistor with 25V collector-emitter voltage, 1.5A collector current, and 1W power dissipation in a TO-92 package \u2014 widely used in consumer electronics for driver and output stages.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nNPN Bipolar Junction Transistor<\/td>\n<\/tr>\n
\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u7535\u538b (VCEO)<\/td>\n25V<\/td>\n<\/tr>\n
\u96c6\u7535\u6781-\u57fa\u6781\u7535\u538b (VCBO)<\/td>\n40V<\/td>\n<\/tr>\n
\u53d1\u5c04\u6781-\u57fa\u6781\u7535\u538b (VEBO)<\/td>\n6V<\/td>\n<\/tr>\n
Collector Current (IC)<\/td>\n1.5A continuous<\/td>\n<\/tr>\n
DC Current Gain (hFE)<\/td>\n85-300 @ IC=100mA, VCE=1V (Grade B\/C\/D)<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n0.5V max @ IC=800mA, IB=80mA<\/td>\n<\/tr>\n
VBE(sat)<\/td>\n1.2V max @ IC=800mA, IB=80mA<\/td>\n<\/tr>\n
\u8f6c\u6362\u9891\u7387 (fT)<\/td>\n100MHz minimum<\/td>\n<\/tr>\n
Output Capacitance (Cob)<\/td>\n9pF typical<\/td>\n<\/tr>\n
\u529f\u7387\u8017\u6563<\/td>\n1W @ TA=25\u00b0C (TO-92)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-65\u00b0C to +150\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTO-92-3 (4.83 x 4.76mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 1.5A collector current in compact TO-92<\/li>\n
  • Complementary PNP: SS8550<\/li>\n
  • Class B push-pull amplifier capable<\/li>\n
  • Three hFE grades: B (85-160), C (120-200), D (160-300)<\/li>\n
  • Low saturation voltage: 0.5V @ 800mA<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Audio output stage (class B push-pull)<\/li>\n
    • LED driver<\/li>\n
    • Low-voltage switching<\/li>\n
    • Motor driver (small DC motors)<\/li>\n
    • Signal amplification<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SS8050 from onsemi is a medium-power NPN transistor with 25V collector-emitter voltage, 1.5A collector current, and 1W power dissipation in a TO-92 package \u2014 widely used in consumer electronics for driver and output stages. Key Specifications Type NPN Bipolar Junction Transistor Collector-Emitter Voltage (VCEO) 25V Collector-Base Voltage (VCBO) 40V Emitter-Base Voltage (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":[19,13],"tags":[],"chip_brand":[144],"class_list":["post-7955","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-on"],"acf":{"brief_explanation":"NPN BJT, 25V 1.5A, TO-92, audio\/driver transistor","date_code":"","package_case":"TO-92-3 (4.83 x 4.76 x 4.19mm, 2.54mm pitch, through-hole)","in_stock":44000,"datasheet":"https:\/\/www.onsemi.com\/download\/data-sheet\/pdf\/ss8050-d.pdf","price":"$0.04 @ 1ku","product_introduction":"The SS8050 from onsemi (formerly Fairchild) is a medium-power NPN transistor in a TO-92 package, offering 1.5A collector current \u2014 significantly higher than typical small-signal transistors like BC547 (100mA) or 2N3904 (200mA). The 25V VCEO limits it to low-voltage applications (3.3V to 12V systems), but within that range, the 1.5A capability makes it suitable for driving LEDs, small motors, and audio output stages. The complementary PNP device is the SS8550, enabling push-pull amplifier configurations. The three hFE grades (B, C, D) allow designers to select the gain range appropriate for their application: Grade B for switching (lower gain, faster), Grade D for amplification (higher gain, more consistent). The 100MHz fT is lower than the 2N2222A's 300MHz but sufficient for audio and moderate-frequency switching. The 1W power dissipation in TO-92 requires careful thermal management; at IC=500mA and VCE=1V, dissipation is 500mW, which is manageable. At IC=1A and VCE=2V, dissipation is 2W, exceeding the TO-92 rating.","working_principle":"The SS8050 is a standard NPN bipolar junction transistor. When base current IB flows into the base terminal, collector current IC = hFE \u00d7 IB flows from collector to emitter. For switching, the transistor is driven into saturation by providing IB \u2265 IC\/hFE(min). For a 500mA load with Grade C (hFE min = 120): IB \u2265 500mA\/120 = 4.2mA; with 2\u00d7 overdrive, IB = 8.4mA. Base resistor: RB = (Vdrive \u2212 VBE) \/ IB = (3.3V \u2212 0.7V) \/ 8.4mA \u2248 310\u03a9. In saturation, VCE(sat) \u2264 0.5V at IC=800mA. For audio amplification in Class B push-pull, two SS8050 (NPN) and SS8550 (PNP) transistors are connected in complementary push-pull: each conducts on alternate half-cycles, driving the speaker through a coupling capacitor. The 1.5A rating and low VCE(sat) make the SS8050 well-suited for this application at supply voltages up to 12V.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>Emitter<\/td>Output<\/td>Emitter terminal. In common-emitter configuration, this pin connects to ground (for NPN). Maximum continuous emitter current is 1.5A. The emitter is the reference terminal for both base-emitter voltage (VBE \u2248 0.7V) and collector-emitter voltage ratings.<\/td><\/tr>\n
      2<\/td>Base<\/td>Input<\/td>Base terminal controls collector current flow. Base current IB drives the transistor into active or saturation region. DC current gain hFE ranges from 85 to 300 depending on grade. Drive IB > IC\/hFE(min) to ensure saturation. Maximum base current is 500mA (pulsed).<\/td><\/tr>\n
      3<\/td>Collector<\/td>Power Output<\/td>Collector terminal connects to the load through the power supply. Rated for 25V VCEO and 1.5A continuous collector current. Power dissipation 1W at TA=25\u00b0C or 2.5W at TC=25\u00b0C. Minimum VCE(sat) is 0.5V at IC=800mA, IB=80mA for efficient switching.<\/td><\/tr>\n<\/table>\n

      SS8050 pin assignment (TO-92-3, flat face toward you, pins down): Pin 1 (left) = Emitter, Pin 2 (center) = Base, Pin 3 (right) = Collector. WARNING: TO-92 pinout varies by manufacturer. Some SS8050 variants use ECB (Emitter-Collector-Base) order. Always verify pinout with the specific manufacturer's datasheet. Complementary PNP: SS8550 (25V\/-1.5A). SMD equivalent: S8050 (SOT-23) for compact PCB layouts.<\/p>","application_scenarios":"

        \n
      • LED Driver:<\/strong> MCU GPIO \u2192 470\u03a9 \u2192 base; collector to LED array (up to 1A); emitter GND; switches 12V LED strips<\/li>\n
      • Push-Pull Audio:<\/strong> SS8050 (NPN) + SS8550 (PNP) in complementary push-pull; 9V supply; 8\u03a9 speaker via 470\u00b5F coupling cap; ~500mW output<\/li>\n
      • Motor Driver:<\/strong> 6V DC motor (500mA); base from MCU PWM through 330\u03a9; collector to motor; emitter GND; flyback diode<\/li>\n
      • Relay Driver:<\/strong> 5V relay coil (100mA); base from MCU through 1k\u03a9; collector to relay; emitter GND; flyback diode<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        SS8550<\/td>onsemi<\/td>PNP complementary, same specs, TO-92<\/td>-<\/td>-<\/td><\/tr>\n
        S8050 (SOT-23)<\/td>Various<\/td>SMD version, 350mW dissipation, SOT-23<\/td>-<\/td>-<\/td><\/tr>\n
        2N2222A<\/td>onsemi<\/td>40V\/600mA, higher voltage, TO-92<\/td>-<\/td>-<\/td><\/tr>\n
        BC547B<\/td>Various<\/td>45V\/100mA, lower current, low noise, TO-92<\/td>-<\/td>-<\/td><\/tr>\n
        S9013<\/td>Various<\/td>30V\/500mA, similar range, TO-92<\/td>-<\/td>-<\/td><\/tr>\n<\/table>\n

        SS8050 is an NPN 25V\/1.5A general-purpose transistor in TO-92 from multiple manufacturers. The complementary PNP is SS8550 (-25V\/-1.5A). The S8050 is the SMD equivalent in SOT-23 with lower 500mA rating. The 2N5551 provides higher 160V VCEO at 600mA for high-voltage switching. The BC547B offers lower current (100mA) with higher gain (200-450 hFE) for small-signal amplification. The MPS2222A from onsemi provides 75V\/600mA in SOT-23 for surface-mount. For Darlington gain, TIP122 offers 1000x hFE at 5A in TO-220.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7955","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=7955"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7955\/revisions"}],"predecessor-version":[{"id":8220,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7955\/revisions\/8220"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7955"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}