{"id":8044,"date":"2026-06-28T08:48:07","date_gmt":"2026-06-28T08:48:07","guid":{"rendered":"https:\/\/materialparts.com\/bc556bta\/"},"modified":"2026-06-28T11:35:30","modified_gmt":"2026-06-28T11:35:30","slug":"bc556bta","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/bc556bta\/","title":{"rendered":"BC556BTA"},"content":{"rendered":"<h2>BC556BTA Overview<\/h2>\n<p>The BC556BTA is a general purpose PNP transistor from onsemi with VCEO -80V, IC -100mA, hFE 220-475 (Group B), in a TO-92 through-hole package, suitable for low-power amplification and switching circuits.<\/p>\n<h3>\u4e3b\u8981\u529f\u80fd<\/h3>\n<ul>\n<li>VCEO: -80V<\/li>\n<li>IC: -100mA<\/li>\n<li>hFE: 220-475 (Group B)<\/li>\n<li>Transition frequency: 100MHz<\/li>\n<li>Power dissipation: 625mW<\/li>\n<li>VCE(sat): -0.3V<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>BC556BTA Overview The BC556BTA is a general purpose PNP transistor from onsemi with VCEO -80V, IC -100mA, hFE 220-475 (Group B), in a TO-92 through-hole package, suitable for low-power amplification and switching circuits. Key Features VCEO: -80V IC: -100mA hFE: 220-475 (Group B) Transition frequency: 100MHz Power dissipation: 625mW VCE(sat): -0.3V<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[57,13],"tags":[],"chip_brand":[144],"class_list":["post-8044","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","chip_brand-on"],"acf":{"brief_explanation":"PNP general-purpose transistor, 80V, 100mA, TO-92","date_code":"","package_case":"TO-92 (5.20 x 4.20 mm, through-hole)","in_stock":8570,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/BC556BTA-D.pdf","price":"$0.04 @ 1ku","product_introduction":"The BC556BTA is a PNP epitaxial silicon general-purpose transistor from onsemi in a TO-92 through-hole package, featuring a -65 V collector-emitter voltage rating, -100 mA continuous collector current, and 150 MHz transition frequency. With a DC current gain (hFE) range of 180 to 460 at the B gain group and 500 mW power dissipation, it is suitable for low-power amplification and switching applications. The device is Pb-free, halogen-free, and RoHS compliant, serving as a complement to the NPN BC546\/BC547\/BC548 series for push-pull amplifier stages.","working_principle":"The BC556BTA operates as a bipolar junction transistor (BJT) in common-emitter, common-base, or common-collector configurations. As a PNP device, current flows from emitter to collector when the base is biased negative relative to the emitter. The base-emitter junction is forward-biased by applying a voltage approximately -0.6 V below the emitter, injecting holes from the emitter into the base region. Most of these holes cross the narrow base and are collected by the reverse-biased collector junction, producing a collector current that is the base current multiplied by the DC current gain (hFE). For switching applications, the transistor is driven between cutoff (base-emitter junction reverse-biased or zero) and saturation (base current sufficient to drive collector-emitter voltage to VCE(sat), typically -90 mV at IC=-10 mA). The 150 MHz transition frequency (fT) allows use in medium-frequency amplifier stages and oscillator circuits.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Description<\/th><\/tr><tr><td>1<\/td><td>Collector<\/td><td>Current sink terminal; connects to load or supply rail<\/td><\/tr><tr><td>2<\/td><td>Base<\/td><td>Control terminal; small current flow controls larger collector current<\/td><\/tr><tr><td>3<\/td><td>Emitter<\/td><td>Current source terminal; typically connected to positive supply in common-emitter configuration<\/td><\/tr><\/table><p>Package: TO-92-3 (Case 135AR, formed leads for tape and reel). Pin identification viewed from the flat face with leads pointing down: left=Collector, center=Base, right=Emitter.<\/p>","application_scenarios":"<ul><li><strong>Small-Signal Amplification<\/strong>: Low-noise audio preamplifier stages and microphone input circuits<\/li><li><strong>Push-Pull Output Stages<\/strong>: Complementary pair with BC546\/BC547 for class AB audio output amplifiers<\/li><li><strong>General-Purpose Switching<\/strong>: Driving LEDs, relays, and small loads from microcontroller GPIO pins<\/li><li><strong>Current Mirrors<\/strong>: Precision current source circuits in analog signal processing<\/li><li><strong>Oscillator Circuits<\/strong>: RC and LC oscillators up to several tens of MHz using the 150 MHz fT<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Polarity<\/th><th>VCEO<\/th><th>IC<\/th><th>fT<\/th><th>Package<\/th><\/tr><tr><td>BC557BTA<\/td><td>onsemi<\/td><td>PNP<\/td><td>-45 V<\/td><td>-100 mA<\/td><td>150 MHz<\/td><td>TO-92<\/td><\/tr><tr><td>BC558BTA<\/td><td>onsemi<\/td><td>PNP<\/td><td>-30 V<\/td><td>-100 mA<\/td><td>150 MHz<\/td><td>TO-92<\/td><\/tr><tr><td>BC807-40<\/td><td>Nexperia<\/td><td>PNP<\/td><td>-45 V<\/td><td>-500 mA<\/td><td>100 MHz<\/td><td>SOT-23<\/td><\/tr><tr><td>2N3906<\/td><td>onsemi<\/td><td>PNP<\/td><td>-40 V<\/td><td>-200 mA<\/td><td>250 MHz<\/td><td>TO-92<\/td><\/tr><tr><td>MMBT3906<\/td><td>onsemi<\/td><td>PNP<\/td><td>-40 V<\/td><td>-200 mA<\/td><td>250 MHz<\/td><td>SOT-23<\/td><\/tr><\/table>\n<p>BC556BTA is a -65V\/-100mA PNP general-purpose transistor from onsemi in TO-92-3 with hFE 110-800. The BC557BTA offers lower -45V VCEO for lower-voltage circuits. BC558BTA provides -30V with optimized low-noise performance. The BC327-25 from Infineon offers higher -800mA current in SOT-23 for surface-mount designs. Complementary NPN: BC546BTA through BC550BTA series share the same TO-92 pinout for push-pull amplifier pairs.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8044","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=8044"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8044\/revisions"}],"predecessor-version":[{"id":8087,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8044\/revisions\/8087"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=8044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=8044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=8044"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=8044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}