{"product_id":"2sc945-c945-to92-npn-bipolar-transistor-50v-50pcs","title":"2SC945 \/ C945 TO-92 NPN Bipolar Transistor 50V (50pcs)","description":"\u003ch2\u003e2SC945 \/ C945 — TO-92 NPN Bipolar Transistor (50pcs)\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003e2SC945\u003c\/strong\u003e (commonly marked \u003cstrong\u003eC945\u003c\/strong\u003e) is a classic Japanese-designed \u003cstrong\u003eNPN small-signal transistor\u003c\/strong\u003e in TO-92 package, rated at \u003cstrong\u003e50V \/ 150mA\u003c\/strong\u003e. Widely used in audio preamplifier stages, signal switching, and general-purpose electronics. This listing provides a \u003cstrong\u003e50-piece pack\u003c\/strong\u003e — new and original parts.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Numbers\u003c\/td\u003e\n\u003ctd\u003e2SC945 \/ C945\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eNPN Bipolar Junction Transistor (BJT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eTO-92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector-Emitter Voltage (Vceo)\u003c\/td\u003e\n\u003ctd\u003e50V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector Current (Ic)\u003c\/td\u003e\n\u003ctd\u003e150mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation (Pd)\u003c\/td\u003e\n\u003ctd\u003e250mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ehFE Groups\u003c\/td\u003e\n\u003ctd\u003eO: 70–140 \/ Y: 120–240 \/ GR: 200–400 \/ BL: 350–700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransition Frequency (ft)\u003c\/td\u003e\n\u003ctd\u003e150MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise Figure\u003c\/td\u003e\n\u003ctd\u003e≤4 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-55°C to +150°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e50 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eWhy Choose 2SC945?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eLow noise figure\u003c\/strong\u003e — ≤4 dB NF, ideal for audio preamp input stages\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eHigh hFE range\u003c\/strong\u003e — up to 700 (BL grade) for high-gain amplifier stages\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e150MHz ft\u003c\/strong\u003e — suitable for RF and IF amplifier stages up to VHF\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eTO-92 package\u003c\/strong\u003e — breadboard and PCB compatible\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e50-piece value pack\u003c\/strong\u003e — sufficient for production runs and repair stock\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eCompatible With \/ Works With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eArduino UNO\/Nano GPIO switching (5V logic to 50V load)\u003c\/li\u003e\n\u003cli\u003eNE555 timer output stage buffering\u003c\/li\u003e\n\u003cli\u003eLM386 audio amplifier input stage\u003c\/li\u003e\n\u003cli\u003eJapanese audio equipment repair (Sony, Panasonic, Pioneer)\u003c\/li\u003e\n\u003cli\u003eComplementary pair with 2SA733 (PNP) for push-pull audio stages\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Preamplifier\u003c\/strong\u003e — low-noise input stage for microphone and phono preamps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Switching\u003c\/strong\u003e — relay driver, LED driver from microcontroller GPIO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRF\/IF Amplifier\u003c\/strong\u003e — VHF signal amplification up to 150MHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOscillator Circuits\u003c\/strong\u003e — Colpitts, Hartley oscillators for RF applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJapanese Equipment Repair\u003c\/strong\u003e — direct replacement in Sony\/Panasonic audio boards\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What do the hFE suffix letters mean (O, Y, GR, BL)?\u003c\/strong\u003e\u003cbr\u003eA: These indicate the DC current gain group: O (70–140), Y (120–240), GR (200–400), BL (350–700). For audio circuits, GR or BL grade provides the most consistent gain. Check the marking on the flat face of the TO-92 package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is 2SC945 equivalent to BC547 or 2N3904?\u003c\/strong\u003e\u003cbr\u003eA: Functionally similar for general-purpose NPN switching. 2SC945 has lower noise figure (≤4 dB) and higher ft (150MHz vs 300MHz for BC547), making it preferred for audio and RF applications. Pinout differs — verify EBC orientation before substituting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the complementary PNP pair for 2SC945?\u003c\/strong\u003e\u003cbr\u003eA: The complementary PNP is \u003cstrong\u003e2SA733\u003c\/strong\u003e (C733). Together they form a matched NPN\/PNP pair for push-pull audio output stages.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e50× 2SC945 \/ C945 TO-92 NPN Bipolar Transistor\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991479767275,"sku":"\u003cnone\u003e","price":9.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/2sc945-to92-npn-bipolar-transistor-c945-50v-original.webp?v=1761547568","url":"https:\/\/keszoox.com\/products\/2sc945-c945-to92-npn-bipolar-transistor-50v-50pcs","provider":"Keszoox","version":"1.0","type":"link"}