{"product_id":"bc327-transistor","title":"BC327 Transistor","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eBC327\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN-GB\"\u003e is a general purpose \u003cstrong\u003ePNP Transistor\u003c\/strong\u003e, the base of which needs to be connected to the ground, to turn on the transistor. This transistor is available in various versions and is manufactured by many different companies, that’s why, the gain of the transistor may vary depending upon the version of the transistor. So, it’s recommended to check out the datasheet of the device before proceeding with the application and the datasheet for this specific transistor can be found on the bottom of the page.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN-GB\"\u003eWhen the transistor is turned off, we can see a \u003cstrong\u003epositive voltage\u003c\/strong\u003e on the transistor’s base, if we measure the voltage between the base and the emitter. Based on the characteristics of the transistor, a minimum amount of current needs to flow out of the base to turn the transistor on and that is when a positive voltage appears on the base, leakage current starts to flow from the base to the ground. The characteristic curve below shows that a minimum of -10mA current needs to flow through the base to flow -300mA of collector current.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN-GB\"\u003eThe below diagram shows the correlation between base current and collector current.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN-GB\"\u003e\u003cimg data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/components101.com\/sites\/default\/files\/inline-images\/BC327-Graph.png?ssl=1\" alt=\"Correlation between Base Current and Collector Current\" data-entity-type=\"file\" data-entity-uuid=\"07570e53-bf54-4b64-9dbe-ca7b5b079c77\" data-src=\"https:\/\/i0.wp.com\/components101.com\/sites\/default\/files\/inline-images\/BC327-Graph.png?ssl=1\" class=\"lazyloaded\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-368024 lazyloaded\" src=\"https:\/\/i0.wp.com\/makerselectronics.com\/wp-content\/uploads\/2016\/08\/BC327-Pinout.jpg?resize=750%2C500\u0026amp;ssl=1\" alt=\"\" width=\"750\" height=\"500\" data-src=\"https:\/\/i0.wp.com\/makerselectronics.com\/wp-content\/uploads\/2016\/08\/BC327-Pinout.jpg?resize=750%2C500\u0026amp;ssl=1\" data-eio-rwidth=\"750\" data-eio-rheight=\"500\"\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eBC327 Pinout Configuration\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003ePin Number\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003ePin Name\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eDescription\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eCollector\u003c\/td\u003e\n\u003ctd\u003eElectrons Emitted from Emitter Collected by the Collector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003ctd\u003eControls the biasing of the transistor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003eEmitter\u003c\/td\u003e\n\u003ctd\u003eElectrons emitted from the emitter into the first PN junction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eBasic Overview and Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBi-Polar, High Voltage PNP Transistor\u003c\/li\u003e\n\u003cli\u003eDC Current Gain (hFE) is 250 ~ 630\u003c\/li\u003e\n\u003cli\u003eContinuous Collector current (IC) is -800mA\u003c\/li\u003e\n\u003cli\u003eBase-Emitter on Voltage -1.2V\u003c\/li\u003e\n\u003cli\u003eMAX Base- Emitter Voltage (VBE) is -5V\u003c\/li\u003e\n\u003cli\u003eCollector-Emitter Voltage (VCE) is -45V\u003c\/li\u003e\n\u003cli\u003eAvailable in To-92 Package\u003c\/li\u003e\n\u003cli\u003eSwitching and Amplifier Applications\u003c\/li\u003e\n\u003cli\u003eSuitable for AF-Driver Stages and Low-Power Output Stage\u003c\/li\u003e\n\u003cli\u003eCompliment to BC337\/BC338\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003eComplete Technical Details can be found at the \u003cstrong\u003eBC327 datasheet \u003c\/strong\u003egiven at the end of this page.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eBasic Working of a Transistor\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eThe BC327 Transistor \u003c\/strong\u003eis a\u003cstrong\u003e general-purpose PNP transistor\u003c\/strong\u003e, in which holes are the primary charge carrier of the device. When the base of the transistor is connected to the ground, leakage current starts to flow out of the base to the ground and the \u003cstrong\u003edepletion region \u003c\/strong\u003eat the base of the transistor starts to shrink and more and more electrons start migrating from the collector to the emitter and into the circuit thus current flows constantly through the circuit.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eHow to use BC327 Transistor\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eUnlike MOSFETs, transistors are current-controlled devices, which means they can be turned on or off by supplying the required base current (for the BC327 transistor it’s -10mA). \u003cstrong\u003eBC327\u003c\/strong\u003e is a PNP transistor that means it will conduct when it’s connected to the ground and it will turn off when the base is connected to 5V.\u003c\/p\u003e\n\u003cp\u003eThe simulated circuit below shows how this transistor behaves when a base current is applied and when no current is provided to the base.\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-recalc-dims=\"1\" decoding=\"async\" class=\"aligncenter lazyloaded\" src=\"https:\/\/i0.wp.com\/components101.com\/sites\/default\/files\/inline-images\/BC327-Circuit.png?ssl=1\" alt=\"BC327 Circuit\" data-entity-type=\"file\" data-entity-uuid=\"0729fc14-cf4b-45db-9fbe-ceb0266dec95\" data-src=\"https:\/\/i0.wp.com\/components101.com\/sites\/default\/files\/inline-images\/BC327-Circuit.png?ssl=1\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhen we turn on the transistor by connecting the base to the ground the transistor will remain on unless the voltage at the base of the transistor reaches more than 1.2V. The base of the transistor cannot be left floating otherwise there could be false triggering to the transistor which may lead to issues in the circuit. To resolve this issue, we need to add pullup resistors, for example, in the above case, a 10K resistor is used to pull up the base of the transistor.\u003c\/p\u003e\n\u003cp\u003eIn the above example, we are using \u003cstrong\u003eBC327 \u003c\/strong\u003eas a\u003cstrong\u003e simple switching device \u003c\/strong\u003eand we have used a small 12V motor as a load. The small button here is for providing the trigger to the transistor and can be removed to leave simple contacts to touch.  The 10KΩ resistor is for limiting the current to base and to avoid breaching maximum voltage allowed at the base and 2.1KΩ resistor is for limiting the current flowing out of base to ground.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003cspan lang=\"EN-GB\"\u003eApplications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSwitching relates and Lad’s\u003c\/li\u003e\n\u003cli\u003ePWM driven application\u003c\/li\u003e\n\u003cli\u003eLED dimmers or flashers\u003c\/li\u003e\n\u003cli\u003eSwitching Applications\u003c\/li\u003e\n\u003cli\u003ePreamplifier for Power Amplifier\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eMicrophone preamplifiers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eRelay drivers\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Robot Pi Shop","offers":[{"title":"Default Title","offer_id":41521105502341,"sku":"TT-000028-DVR","price":0.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0565\/5819\/0725\/files\/BC327-1.png?v=1771341551","url":"https:\/\/robotpishop.com\/products\/bc327-transistor","provider":"Robot Pi Shop","version":"1.0","type":"link"}