{"product_id":"a40-bc549c-npn-low-noise-transistor-30v-100ma-to-92-package-high-current-gain-hfe-for-audio-preamps","title":"A40 BC549C NPN Low Noise Transistor, 30V 100mA, TO-92 Package, High Current Gain (hFE) for Audio Preamps","description":"\u003cp data-path-to-node=\"7\"\u003eThe \u003cb data-path-to-node=\"7\" data-index-in-node=\"4\"\u003eBC549C\u003c\/b\u003e is a premium small-signal NPN transistor designed for use in low-noise stage amplifiers. While it shares a similar footprint with the standard BC548, the BC549C is specifically screened for its \u003cb data-path-to-node=\"7\" data-index-in-node=\"205\"\u003eLow Noise Figure\u003c\/b\u003e, making it the ideal choice for processing weak analog signals. The \"C\" suffix denotes the highest gain classification (\u003cspan class=\"math-inline\" data-math=\"h_{FE}\" data-index-in-node=\"342\"\u003e$h_{FE}$\u003c\/span\u003e), ensuring maximum sensitivity and amplification for your circuit.\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"8\"\u003e\u003cb data-path-to-node=\"8\" data-index-in-node=\"0\"\u003eKey Technical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"9\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,0,0\"\u003e\u003cb data-path-to-node=\"9,0,0\" data-index-in-node=\"0\"\u003eTransistor Type:\u003c\/b\u003e NPN\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,1,0\"\u003e\u003cb data-path-to-node=\"9,1,0\" data-index-in-node=\"0\"\u003eCollector-Emitter Voltage (\u003cspan class=\"math-inline\" data-math=\"V_{CEO}\" data-index-in-node=\"27\"\u003e$V_{CEO}$\u003c\/span\u003e):\u003c\/b\u003e 30V\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,2,0\"\u003e\u003cb data-path-to-node=\"9,2,0\" data-index-in-node=\"0\"\u003eCollector Current (\u003cspan class=\"math-inline\" data-math=\"I_C\" data-index-in-node=\"19\"\u003e$I_C$\u003c\/span\u003e):\u003c\/b\u003e 100mA (Continuous)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,3,0\"\u003e\u003cb data-path-to-node=\"9,3,0\" data-index-in-node=\"0\"\u003eCurrent Gain (\u003cspan class=\"math-inline\" data-math=\"h_{FE}\" data-index-in-node=\"14\"\u003e$h_{FE}$\u003c\/span\u003e):\u003c\/b\u003e 420 to 800 (Category C - High Gain)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,4,0\"\u003e\u003cb data-path-to-node=\"9,4,0\" data-index-in-node=\"0\"\u003eNoise Figure:\u003c\/b\u003e Extremely low (typically 1.2 dB to 4 dB)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,5,0\"\u003e\u003cb data-path-to-node=\"9,5,0\" data-index-in-node=\"0\"\u003ePackage Type:\u003c\/b\u003e TO-92 (Through-hole)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,6,0\"\u003e\u003cb data-path-to-node=\"9,6,0\" data-index-in-node=\"0\"\u003eTransition Frequency (\u003cspan class=\"math-inline\" data-math=\"f_T\" data-index-in-node=\"22\"\u003e$f_T$\u003c\/span\u003e):\u003c\/b\u003e 300MHz (Typical)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eApplications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"11\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,0,0\"\u003e\u003cb data-path-to-node=\"11,0,0\" data-index-in-node=\"0\"\u003eHi-Fi Audio Preamplifiers:\u003c\/b\u003e Essential for the input stages of phono preamps, microphone mixers, and guitar pedals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e\u003cb data-path-to-node=\"11,1,0\" data-index-in-node=\"0\"\u003eLow-Level Signal Processing:\u003c\/b\u003e Amplifying weak sensor outputs without adding background \"hiss\" or distortion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,2,0\"\u003e\u003cb data-path-to-node=\"11,2,0\" data-index-in-node=\"0\"\u003eInstrumentation:\u003c\/b\u003e Precision measurement circuits requiring stable, high-gain amplification.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,3,0\"\u003e\u003cb data-path-to-node=\"11,3,0\" data-index-in-node=\"0\"\u003eTape Head Amplifiers:\u003c\/b\u003e Classic component for vintage audio restoration and repair.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"12\"\u003e\u003cb data-path-to-node=\"12\" data-index-in-node=\"0\"\u003eWhy Choose the BC549C?\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003eSuperior Audio Fidelity:\u003c\/b\u003e Specifically designed to minimize electronic noise, ensuring a crystal-clear signal path.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003eMaximum Gain:\u003c\/b\u003e The \"C\" grade classification provides a significantly higher gain than \"A\" or \"B\" versions, allowing for fewer amplification stages in a design.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,2,0\"\u003e\u003cb data-path-to-node=\"13,2,0\" data-index-in-node=\"0\"\u003eStandard Pinout:\u003c\/b\u003e Drop-in compatibility with other BC5xx series transistors (C-B-E configuration).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SLVSALES","offers":[{"title":"Default Title","offer_id":45763770155194,"sku":null,"price":4.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/6377\/9258\/files\/Screenshot2026-04-09121401.png?v=1775717090","url":"https:\/\/www.slvsales.in\/products\/a40-bc549c-npn-low-noise-transistor-30v-100ma-to-92-package-high-current-gain-hfe-for-audio-preamps","provider":"SLVSALES","version":"1.0","type":"link"}