{"product_id":"si9945a-fds9945-dual-n-channel-60v-mosfet-so8","title":"SI9945A \/ FDS9945 Dual N-Channel 60V MOSFET – SO-8","description":"\u003cp\u003e\u003cstrong\u003eSI9945A \/ FDS9945 dual N-channel MOSFET\u003c\/strong\u003e combines two 60 V power MOSFET channels in one compact SO‑8 package. It is designed for DC-DC converters, synchronous or conventional switching, load switching, inverter circuits and electronic power-supply repair. The product photograph shows a component marked \u003cstrong\u003e9945A\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDual N-channel enhancement-mode MOSFET configuration\u003c\/li\u003e\n\u003cli\u003e60 V drain-source voltage class per channel\u003c\/li\u003e\n\u003cli\u003eTwo MOSFETs integrated in one SO‑8 \/ SOP‑8 package\u003c\/li\u003e\n\u003cli\u003eLogic-level compatible gate-drive family\u003c\/li\u003e\n\u003cli\u003eLow on-resistance and low gate charge\u003c\/li\u003e\n\u003cli\u003eFast switching for DC-DC converter and PWM applications\u003c\/li\u003e\n\u003cli\u003eSuitable for compact power-management and repair applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplayed marking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9945A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrimary reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSI9945AEY family\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFDS9945 family; compare exact limits and pinout before substitution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual N-channel MOSFET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrain-source voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 V per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSI9945A reference current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 3.7 A under specified datasheet test conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSI9945A reference RDS(on)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80 mΩ maximum at VGS = 10 V; 100 mΩ maximum at VGS = 4.5 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSO‑8 \/ SOP‑8 surface mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum junction temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e175°C reference for SI9945AEY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × 9945A dual N-channel MOSFET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility notice:\u003c\/strong\u003e SI9945A, SI9945AEY, FDS9945 and parts informally sold as “FDS9945A” may have different current, RDS(on), gate charge, thermal limits, production markings or pin assignments. Verify the original component, circuit schematic and official manufacturer datasheet before replacement. Continuous current depends strongly on PCB copper area, airflow and temperature.\u003c\/p\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDC-DC converter switching stages\u003c\/li\u003e\n\u003cli\u003ePower-supply and inverter repair\u003c\/li\u003e\n\u003cli\u003eLCD TV and monitor power boards\u003c\/li\u003e\n\u003cli\u003eDual load-switch circuits\u003c\/li\u003e\n\u003cli\u003eSynchronous rectification and PWM switching\u003c\/li\u003e\n\u003cli\u003eEmbedded and industrial power management\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs the SI9945A a single or dual MOSFET?\u003c\/h3\u003e\n\u003cp\u003eIt contains two N-channel MOSFETs in one SO‑8 package.\u003c\/p\u003e\n\u003ch3\u003eWhat is the voltage rating?\u003c\/h3\u003e\n\u003cp\u003eThe SI9945A and FDS9945 families are 60 V drain-source devices. Confirm the complete part number before installation.\u003c\/p\u003e\n\u003ch3\u003eIs it N-channel or P-channel?\u003c\/h3\u003e\n\u003cp\u003eBoth internal MOSFET channels are N-channel.\u003c\/p\u003e\n\u003ch3\u003eAre SI9945A and FDS9945 exact replacements?\u003c\/h3\u003e\n\u003cp\u003eThey are commonly compared, but their resistance, current and other limits differ. Confirm pinout and all critical ratings for the target circuit.\u003c\/p\u003e\n\u003ch3\u003eWhat package does it use?\u003c\/h3\u003e\n\u003cp\u003eIt uses an eight-lead SO‑8\/SOP‑8 surface-mount package.\u003c\/p\u003e\n\u003ch3\u003eCan it work with a 4.5 V gate drive?\u003c\/h3\u003e\n\u003cp\u003eThe referenced families publish RDS(on) specifications at 4.5 V, but the designer must still verify switching loss and thermal performance.\u003c\/p\u003e\n\u003ch3\u003eCan I use it for power-supply repair?\u003c\/h3\u003e\n\u003cp\u003eYes, when the original part’s pinout and electrical requirements match. Diagnose the surrounding driver and load before installing a replacement.\u003c\/p\u003e\n\u003ch3\u003eCan it be soldered by hand?\u003c\/h3\u003e\n\u003cp\u003eExperienced technicians can replace it using appropriate hot-air or fine-tip equipment, flux, magnification and ESD-safe handling.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAll manufacturer names and part numbers are used for identification and compatibility reference.\u003c\/em\u003e\u003c\/p\u003e","brand":"Embeded Studio","offers":[{"title":"Default Title","offer_id":62249990127986,"sku":"ES-SI9945A-FDS9945-SO8","price":90.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/7935\/3202\/files\/SI9945A.webp?v=1787937640","url":"https:\/\/embededstudio.com\/products\/si9945a-fds9945-dual-n-channel-60v-mosfet-so8","provider":"Embeded Studio","version":"1.0","type":"link"}