{"product_id":"svf20n50f-power-mosfet-psu-repair","title":"SVF20N50F Power MOSFET 20A 500V TO-220F Power Supply repair","description":"\u003ch2\u003eSVF20N50F 20A 500V N-Channel MOSFET – High-Power Switching for Mining PSU Repair\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSVF20N50F\u003c\/strong\u003e is a \u003cstrong\u003e20 A \/ 500 V\u003c\/strong\u003e N-channel power MOSFET in a \u003cstrong\u003eTO-220F\u003c\/strong\u003e fully-insulated package, built on Silan Microelectronics' \u003cstrong\u003eF-Cell VDMOS\u003c\/strong\u003e process. With a typical on-resistance of just \u003cstrong\u003e0.20 Ω\u003c\/strong\u003e, it minimises conduction losses in the primary-side switching stage of crypto miner power supplies. The TO-220F package provides full electrical insulation between the drain tab and the heatsink, eliminating the need for a mica washer and simplifying thermal management in dense PSU layouts.\u003c\/p\u003e\n\u003ch3\u003eWhy This MOSFET Fails in Mining Power Supplies\u003c\/h3\u003e\n\u003cp\u003ePrimary-side MOSFETs in mining PSUs switch the full DC bus voltage at frequencies typically between 65 kHz and 130 kHz, generating substantial switching and conduction losses. Under continuous 24\/7 load, cumulative thermal stress degrades the gate oxide and the die-to-lead solder joint. Voltage spikes from transformer leakage inductance or mains transients can also exceed the drain-source breakdown rating if the snubber circuit has deteriorated. A failed MOSFET typically results in a blown input fuse, no output from the PSU, or in partial-failure cases, intermittent shutdowns under load as the damaged device oscillates between conduction and blocking states.\u003c\/p\u003e\n\u003ch3\u003eReplacement Procedure\u003c\/h3\u003e\n\u003cp\u003eDisconnect the PSU from mains and discharge the bulk capacitors — primary-side voltages can exceed 400 V DC and remain lethal for minutes after power-off. Locate the SVF20N50F on the primary switching board, typically bolted to a heatsink near the main transformer. Remove the mounting screw, desolder the three leads (gate, drain, source), and clean the pads. Install the new MOSFET with the correct pin orientation per the board silkscreen, apply thermal compound between the TO-220F tab and the heatsink, and torque the mounting screw to specification. After reassembly, power the PSU through a variac and monitor the output voltage under progressive load — a stable, ripple-free output confirms a good repair.\u003c\/p\u003e\n\u003cp\u003eThe SVF20N50F's low gate charge and fast switching characteristics make it suitable for both hard-switched and resonant (LLC) topologies commonly found in mining PSUs rated from 1,200 W to 3,600 W. If you are replacing multiple MOSFETs on the same half-bridge, always replace both devices as a matched pair to ensure balanced switching.\u003c\/p\u003e\n\u003ch4\u003eSVF20N50F MOSFET Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eType Designator\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eSVF20N50F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTransistor Type\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eN-Channel MOSFET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eDrain-Source Voltage (Vds)\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e500V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eDrain Current (Id)\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRds(on)\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e0.20Ω (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTechnology\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eSilan F-Cell VDMOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePackage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTO-220F (fully insulated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eRelated Power MOSFETs for Mining PSU Repair\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mdf5n50f-nchannel-mosfet-500v-avalon-miner-power-supply-repair\"\u003eMDF5N50F 500V N-Channel MOSFET – Avalon PSU Repair\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pip-ptw40n50-performance-500v-46a-540w-nchannel-mosfet-cryptominer-repair\"\u003ePTW40N50 500V 46A MOSFET – Crypto Miner PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/gpt13n50dg-high-voltage-mosfet-whatsminer-power-supply-repair\"\u003eGPT13N50DG High-Voltage MOSFET – Whatsminer PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/nce65tf130d-650v-28a-n-channel-super-junction-power-mosfet-for-psu-repair\"\u003eNCE65TF130D 650V 28A Super Junction MOSFET – PSU Repair\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReplacing MOSFETs across a fleet of mining PSUs? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for matched pairs and volume pricing.\u003c\/p\u003e\n\u003cp\u003eWorldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":42549788442803,"sku":null,"price":0.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/SVF20N50F-High-Power-MOSFET-20A-500V-TO-220F.webp?v=1768723812","url":"https:\/\/lys-sz.com\/products\/svf20n50f-power-mosfet-psu-repair","provider":"LYS Shenzhen","version":"1.0","type":"link"}