{"product_id":"pip-ptw40n50-mosfet-psu-repair","title":"PTW40N50 N-Channel MOSFET TO-3P-3 PSU Repair","description":"\u003ch2\u003ePTW40N50 500V 46A N-Channel MOSFET – High-Power Switching for Crypto Miner PSU Repair\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003ePIP PTW40N50\u003c\/strong\u003e is a \u003cstrong\u003e500 V \/ 46 A\u003c\/strong\u003e N-channel power MOSFET in a \u003cstrong\u003eTO-3P-3\u003c\/strong\u003e package, rated for \u003cstrong\u003e540 W\u003c\/strong\u003e dissipation. With an on-resistance of \u003cstrong\u003e100 mΩ at 10 V, 23 A\u003c\/strong\u003e and a gate threshold of \u003cstrong\u003e4 V\u003c\/strong\u003e, it delivers efficient primary-side switching in mining PSUs rated from 1,200 W to 3,600 W. The TO-3P package provides excellent heatsink thermal coupling for continuous high-load mining operation.\u003c\/p\u003e\n\u003ch3\u003eWhy Primary-Side MOSFETs Fail\u003c\/h3\u003e\n\u003cp\u003ePrimary-side MOSFETs carry the full DC bus current at up to 400 V DC while switching at 65–130 kHz. Under 24\/7 load, thermal fatigue degrades the gate oxide and die-to-leadframe bond. Dust accumulation on the PSU heatsink accelerates the process. A failed MOSFET typically blows the input fuse or causes the PSU to cycle on and off. Because these devices work in pairs (half-bridge), a single failure often damages its partner — always replace both together.\u003c\/p\u003e\n\u003ch3\u003eReplacement Procedure\u003c\/h3\u003e\n\u003cp\u003eDisconnect mains and discharge bulk capacitors (\u0026gt;400 V DC). Locate the PTW40N50 bolted to the heatsink near the power transformer. Remove mounting hardware, desolder the three leads and clean pads. Install the new MOSFET with correct pin orientation, apply thermal compound to the TO-3P tab, and torque the mounting screw. Power through a variac under progressive load — a clean, stable output confirms a good repair. The 540 W rating provides generous derating, translating to lower junction temperatures and longer life.\u003c\/p\u003e\n\u003ch4\u003ePTW40N50 MOSFET Specifications\u003c\/h4\u003e\n\u003ctable style=\"width: 100%; height: 190px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003ePart Number\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003ePIP PTW40N50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eChannel Type\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003eN-Channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eDrain-Source Voltage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003e500 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eDrain Current\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003e46 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003e540 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eRds(on)\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003e100 mΩ @ 10 V, 23 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eGate Threshold\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003e4 V @ 250 µA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003ePackage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\u003eTO-3P-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 45.342339%; height: 19px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px; width: 44.243707%; height: 19px;\"\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 500V+ Power MOSFETs for Mining PSU Repair\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/svf20n50f-top-performance-high-power-mosfet-20a-500v-to-220f\"\u003eSVF20N50F 20A 500V MOSFET TO-220F\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mdf5n50f-nchannel-mosfet-500v-avalon-miner-power-supply-repair\"\u003eMDF5N50F 500V N-Channel MOSFET – Avalon PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/si7n65f-650v-mosfet-antminer-apw17-apw12-psu-repair\"\u003eSI7N65F 650V MOSFET – Antminer APW17 \/ APW12 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\u003c\/ul\u003e\n\u003cp\u003eReplacing primary-side MOSFETs in bulk? \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":42525728899251,"sku":null,"price":2.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/PIP-PTW40N50-High-Performance-500V-46A-540W-TO3P3-MOSFET_3.webp?v=1747962178","url":"https:\/\/lys-sz.com\/products\/pip-ptw40n50-mosfet-psu-repair","provider":"LYS Shenzhen","version":"1.0","type":"link"}