{"id":10574,"date":"2026-07-20T05:50:59","date_gmt":"2026-07-20T05:50:59","guid":{"rendered":"https:\/\/ic-vendor.com\/bss138-3\/"},"modified":"2026-07-20T05:50:59","modified_gmt":"2026-07-20T05:50:59","slug":"bss138-3","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/bss138-3\/","title":{"rendered":"BSS138"},"content":{"rendered":"

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

The onsemi BSS138 is an N-channel logic-level enhancement mode MOSFET in a SOT-23-3 package. With 50V drain-source voltage, 220mA continuous drain current, and low on-resistance of 3.5\u03a9 (max at VGS=10V), it is designed for low-voltage, low-current switching applications such as small servo motor control, power MOSFET gate drivers, and level shifting.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Channel Type<\/td>\nN-Channel (Enhancement Mode)<\/td>\n<\/tr>\n
Drain-Source Voltage (VDSS)<\/td>\n50 V<\/td>\n<\/tr>\n
Continuous Drain Current (ID)<\/td>\n220 mA (at TA=25\u00b0C)<\/td>\n<\/tr>\n
Pulsed Drain Current<\/td>\n880 mA<\/td>\n<\/tr>\n
RDS(on) at VGS=10V<\/td>\n3.5 \u03a9 (max), 0.7 \u03a9 (typ)<\/td>\n<\/tr>\n
RDS(on) at VGS=4.5V<\/td>\n6.0 \u03a9 (max), 1.0 \u03a9 (typ)<\/td>\n<\/tr>\n
Gate Threshold Voltage<\/td>\n0.8V to 1.5V (at ID=1mA)<\/td>\n<\/tr>\n
Gate-Source Voltage (VGSS)<\/td>\n\u00b120 V<\/td>\n<\/tr>\n
Total Gate Charge (Qg)<\/td>\n1.7 nC (typ at VGS=10V)<\/td>\n<\/tr>\n
Input Capacitance (Ciss)<\/td>\n27 pF (typ at VDS=25V)<\/td>\n<\/tr>\n
\u529f\u7387\u8017\u6563<\/td>\n360 mW (at TA=25\u00b0C)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55\u00b0C \u81f3 +150\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-23-3 (TO-236AB)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Logic-level gate drive: fully enhanced at VGS=4.5V<\/li>\n
  • Low threshold voltage (0.8V min) for direct MCU interfacing<\/li>\n
  • High density cell design for low RDS(on)<\/li>\n
  • Compact industry-standard SOT-23 surface mount package<\/li>\n
  • Fast switching: turn-on delay 2.5ns, turn-off delay 20ns<\/li>\n
  • Pb-free and halogen free<\/li>\n
  • ESD protection on gate (internal)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Logic-level translation and level shifting (I2C, SPI)<\/li>\n
    • Small servo motor control<\/li>\n
    • Power MOSFET gate drivers<\/li>\n
    • Low-side load switches<\/li>\n
    • Relay and solenoid drivers<\/li>\n
    • General-purpose switching circuits<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The onsemi BSS138 is an N-channel logic-level enhancement mode MOSFET in a SOT-23-3 package. With 50V drain-source voltage, 220mA continuous drain current, and low on-resistance of 3.5\u03a9 (max at VGS=10V), it is designed for low-voltage, low-current switching applications such as small servo motor control, power MOSFET gate drivers, and level shifting. Key Specifications […]<\/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":[13],"tags":[1907,1910,473,1909,1908],"chip_brand":[182],"class_list":["post-10574","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","tag-bss138","tag-logic-level","tag-mosfet","tag-n-channel","tag-onsemi","chip_brand-onsemi"],"acf":{"brief_explanation":"N-channel logic-level MOSFET, 50V 220mA, 3.5\u03a9 RDS(on), SOT-23-3, onsemi","date_code":"","package_case":"SOT-23-3 (TO-236AB) 2.9\u00d72.8\u00d71.1mm","in_stock":500000,"datasheet":"https:\/\/www.onsemi.com\/pdf\/datasheet\/bss138-d.pdf","price":"$0.027 @ 3000+","product_introduction":"The onsemi BSS138 is an N-channel enhancement mode logic-level MOSFET in the industry-standard SOT-23-3 package. It features a 50V drain-source voltage rating, 220mA continuous drain current, and low on-resistance of 3.5\u03a9 (max at VGS=10V). The logic-level gate drive capability (fully enhanced at 4.5V) and low gate threshold (0.8V-1.5V) make it ideal for direct microcontroller interfacing in level shifting, small load switching, and gate driver applications. The high-density cell design minimizes RDS(on) while the compact SOT-23 package enables high-density PCB layouts.","working_principle":"The BSS138 is an enhancement-mode N-channel MOSFET. The device consists of a P-type silicon substrate with N+ source and drain regions. When a positive voltage is applied to the gate (above threshold VGS(th) of 0.8-1.5V), the electric field through the thin gate oxide inverts the P-type channel region to N-type, creating a conductive path between drain and source. The on-resistance (RDS(on)) depends on VGS: at 10V, RDS(on) is typically 0.7\u03a9; at 4.5V, it increases to 1.0\u03a9 typ (6.0\u03a9 max). The MOSFET is voltage-controlled \u2014 negligible DC gate current flows after the gate capacitance (Ciss=27pF) is charged. Total gate charge is only 1.7nC, enabling fast switching. The body diode (drain-source diode) can conduct reverse current with a forward voltage of 0.8V (typ), useful in flyback\/catch diode applications.","pin_description":"Pin Description(Output pin definitions in table format only; return pure content without derivation or extra elaboration)","application_scenarios":"Application Scenarios (Output pin definitions in table format only; return pure content without derivation or extra elaboration)","alternative_models":"2N7002 (onsemi\/Fairchild, 60V 300mA, similar); BSS138W (onsemi, SOT-323\/SC-70, smaller); DMN3133L (Diodes Inc, 30V, lower RDS(on)); SI2302 (Vishay, 20V 2.2A, much higher current); AO3400 (Alpha & Omega, 30V 5A, much higher current)"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10574"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10574\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10574"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}