{"id":3343,"date":"2026-06-01T01:58:41","date_gmt":"2026-06-01T01:58:41","guid":{"rendered":"https:\/\/materialparts.com\/bd681g\/"},"modified":"2026-06-01T01:58:41","modified_gmt":"2026-06-01T01:58:41","slug":"bd681g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/bd681g\/","title":{"rendered":"BD681G"},"content":{"rendered":"

Productos<\/h2>\n

The BD681G from STMicroelectronics is a PNP Darlington power transistor in a SOT-32 (TO-126) package. Rated at -80V VCEO and -4A continuous collector current with a minimum DC current gain (hFE) of 750 at IC=2A. Designed for medium-power switching and amplification in industrial and consumer applications.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Polarity<\/td>\nPNP Darlington<\/td>\n<\/tr>\n
VCEO<\/td>\n-80V<\/td>\n<\/tr>\n
IC (Continuous)<\/td>\n-4A<\/td>\n<\/tr>\n
IC (Peak)<\/td>\n-6A<\/td>\n<\/tr>\n
hFE (min) @ IC=2A<\/td>\n750<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n-1.5V max @ IC=2A, IB=8mA<\/td>\n<\/tr>\n
Power Dissipation<\/td>\n40W (TC=25 C)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-65 to 150 C<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-32 (TO-126)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • PNP Darlington configuration<\/li>\n
  • High current gain: hFE > 750 at 2A<\/li>\n
  • 80V collector-emitter voltage<\/li>\n
  • 4A continuous, 6A peak current<\/li>\n
  • 40W power dissipation (with heatsink)<\/li>\n
  • Internal base-emitter resistors for stability<\/li>\n
  • Complementary pair with BD682G (NPN)<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Medium-power switching (relays, solenoids, motors)<\/li>\n
    • Audio output amplifiers<\/li>\n
    • Lamp and LED drivers<\/li>\n
    • Power supply regulators<\/li>\n
    • Heater and actuator control<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BD681G from STMicroelectronics is a PNP Darlington power transistor in a SOT-32 (TO-126) package. Rated at -80V VCEO and -4A continuous collector current with a minimum DC current gain (hFE) of 750 at IC=2A. Designed for medium-power switching and amplification in industrial and consumer applications. Key Specifications Polarity PNP Darlington VCEO -80V […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,56],"tags":[],"chip_brand":[142],"class_list":["post-3343","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-mosfets","chip_brand-st"],"acf":{"brief_explanation":"PNP Darlington, -80V, -4A, hFE>750, SOT-32, complement to BD682G","date_code":"","package_case":"SOT-32 \/ TO-126 (5.4 x 6.2 x 2.3 mm, tab=collector)","in_stock":5400,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/bd681.pdf","price":"$0.52 @ 1ku","product_introduction":"The BD681G from ST is a PNP Darlington power transistor rated at -80V, -4A in SOT-32 (TO-126) package. The Darlington configuration provides hFE > 750 at IC=2A, enabling direct drive from low-current logic. Internal base-emitter resistors ensure thermal stability. Complementary pair with BD682G (NPN). Suitable for medium-power switching, motor control, and audio amplification.","working_principle":"The Darlington configuration cascades two PNP transistors: the first (driver) collector feeds the second (output) base. The combined current gain is the product of both transistor hFE values, yielding >750. Internal base-emitter shunt resistors prevent leakage current from turning on the output transistor and improve switching speed by providing a discharge path for stored base charge. VCE(sat) is higher (~1.5V) than a single transistor due to the two VBE drops.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Base<\/td>Input<\/td>Darlington base input<\/td><\/tr>
      2<\/td>Collector<\/td>Output<\/td>Collector (heatsink tab)<\/td><\/tr>
      3<\/td>Emitter<\/td>Output<\/td>Emitter<\/td><\/tr><\/table>","application_scenarios":"
      • Motor H-bridge high-side PNP switch driven directly from MCU GPIO<\/li>
      • Relay and solenoid driver with high gain<\/li>
      • Audio amplifier output stage (complementary with BD682G)<\/li>
      • LED\/lamp driver for high-current loads<\/li>
      • Linear voltage regulator pass element<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        ST<\/td>BD682G<\/td>SOT-32<\/td>NPN complementary Darlington<\/td><\/tr>
        onsemi<\/td>TIP127<\/td>TO-220<\/td>PNP Darlington, -5A, TO-220<\/td><\/tr>
        ST<\/td>BD681<\/td>TO-126<\/td>Lead version (non-G suffix)<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3343","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=3343"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3343\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=3343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=3343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=3343"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=3343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}