{"id":9712,"date":"2026-07-05T09:39:08","date_gmt":"2026-07-05T09:39:08","guid":{"rendered":"https:\/\/materialparts.com\/src1203s-hf\/"},"modified":"2026-07-05T09:39:08","modified_gmt":"2026-07-05T09:39:08","slug":"src1203s-hf","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/src1203s-hf\/","title":{"rendered":"SRC1203S-HF"},"content":{"rendered":"<h2>Productos<\/h2>\n<p>The SRC1203S-HF is a pre-biased NPN digital transistor from Kodenshi AUK in a SOT-23 package. It integrates a 22k ohm base series resistor (R1) and 22k ohm base-emitter parallel resistor (R2), simplifying circuit design by reducing external component count and manufacturing steps.<\/p>\n<h2>Especificaciones<\/h2>\n<ul>\n<li>Type: NPN Pre-Biased Digital Transistor<\/li>\n<li>V_CEO: 50V<\/li>\n<li>I_C: 100mA<\/li>\n<li>P_D: 200mW at TA=25C<\/li>\n<li>h_FE: 120 typical, 70 min<\/li>\n<li>R1 (Base Series Resistor): 22k ohm<\/li>\n<li>R2 (Base-Emitter Resistor): 22k ohm<\/li>\n<li>V_CE(sat): 0.3V at I_C=10mA<\/li>\n<li>V_I(on): 2.1V<\/li>\n<li>V_I(off) max: 1.2V<\/li>\n<li>V_O(on): 100mV<\/li>\n<li>I_CEO: 500nA max<\/li>\n<li>f_T: 200MHz<\/li>\n<li>V_BE: 0.7V<\/li>\n<li>Package: SOT-23-3 (2.9 x 1.65 x 1.10mm)<\/li>\n<li>Marking: RC3<\/li>\n<li>Operating Temperature: -55C to +150C<\/li>\n<li>LCSC Part: C174313<\/li>\n<li>RoHS: Compliant<\/li>\n<li>ECCN: EAR99<\/li>\n<\/ul>\n<h2>Caracter\u00edsticas<\/h2>\n<ul>\n<li>Integrated bias resistors reduce external component count<\/li>\n<li>Simplifies PCB layout and manufacturing<\/li>\n<li>High packing density for compact designs<\/li>\n<li>Standard SOT-23 footprint for automated assembly<\/li>\n<\/ul>\n<h2>Aplicaciones<\/h2>\n<ul>\n<li>Digital signal switching and inversion<\/li>\n<li>Interface and driver circuits<\/li>\n<li>MCU GPIO to relay\/LED drive interface<\/li>\n<li>Consumer electronics backlight control<\/li>\n<li>Industrial PLC I\/O module signal buffering<\/li>\n<li>Communication equipment level translation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Product Overview The SRC1203S-HF is a pre-biased NPN digital transistor from Kodenshi AUK in a SOT-23 package. It integrates a 22k ohm base series resistor (R1) and 22k ohm base-emitter parallel resistor (R2), simplifying circuit design by reducing external component count and manufacturing steps. Key Specifications Type: NPN Pre-Biased Digital Transistor V_CEO: 50V I_C: 100mA [&hellip;]<\/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":[13,56],"tags":[971],"chip_brand":[970],"class_list":["post-9712","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-mosfets","tag-src1203s-hf","chip_brand-kodenshi-auk"],"acf":{"brief_explanation":"NPN pre-biased digital transistor, 50V\/100mA, R1=R2=22k, hFE=120, SOT-23, RC3 mark","date_code":"","package_case":"SOT-23-3 (2.9 x 1.65 x 1.10mm)","in_stock":8328,"datasheet":"https:\/\/www.lcsc.com\/product-detail\/Digital-Transistors_Kodenshi-AUK-SRC1203S-HF_C174313.html","price":"$0.01 @ 3ku","product_introduction":"The SRC1203S-HF from Kodenshi AUK is a pre-biased NPN digital transistor with integrated 22k ohm base resistors in a SOT-23 package, simplifying switching and interface circuit design.","working_principle":"The pre-biased transistor integrates a 22k ohm series resistor (R1) between the input pin and base, and a 22k ohm parallel resistor (R2) between base and emitter. When V_I exceeds V_I(on) of 2.1V, current flows through R1 into the base, turning the transistor on. The integrated resistors eliminate external biasing components.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Function<\/th><\/tr><tr><td>1<\/td><td>B (via R1)<\/td><td>Base input through 22k resistor<\/td><\/tr><tr><td>2<\/td><td>E<\/td><td>Emitter (GND)<\/td><\/tr><tr><td>3<\/td><td>C<\/td><td>Collector (output)<\/td><\/tr><\/table>","application_scenarios":"<ul><li>MCU GPIO to relay\/LED drive<\/li><li>Digital signal level shifting<\/li><li>Logic gate replacement<\/li><li>Consumer electronics backlight control<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Spec1<\/th><th>Spec2<\/th><\/tr><tr><td>DTA114YCA<\/td><td>ROHM<\/td><td>R1=10k PNP<\/td><td>SOT-23<\/td><\/tr><tr><td>PDTD123JT<\/td><td>Nexperia<\/td><td>R1=2.2k NPN<\/td><td>SOT-23<\/td><\/tr><tr><td>BC847CW<\/td><td>Nexperia<\/td><td>No R NPN<\/td><td>SOT-23<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9712","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=9712"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9712\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=9712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=9712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=9712"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=9712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}