{"product_id":"400uh-20a-toroidal-pfc-inductor-bitmain-apw17-psu-repair","title":"400uH 20A Toroidal PFC Inductor – Bitmain APW17 PSU Repair","description":"\u003ch2\u003e400uH 20A Toroidal PFC Power Inductor – Bitmain Antminer APW17 (1215A \/ 1215B \/ 1215C) PSU Repair for S21 \/ S21XP \/ S19jXP \/ KS5 \/ L9\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e400 µH, 20 A toroidal PFC power inductor\u003c\/strong\u003e is developed specifically for the \u003cstrong\u003erepair and replacement of Antminer APW17-series power supplies\u003c\/strong\u003e — \u003cstrong\u003eAPW17 1215A, 1215B and 1215C\u003c\/strong\u003e. It uses \u003cstrong\u003eflat copper enamelled wire wound on a toroidal core\u003c\/strong\u003e and sits in the \u003cstrong\u003ePFC (Power Factor Correction) circuit\u003c\/strong\u003e of the PSU. It fits the APW17 that powers \u003cstrong\u003eAntminer S21, S21 Pro, S21XP, S21++, S19jXP, KS5, KS5 Pro, L9 and L11\u003c\/strong\u003e miners, and resolves the standard PFC-inductor failure family: \u003cstrong\u003einductor overheating, magnetic saturation under load, coil burnout, and PSU that refuses to start up\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eBuilt with \u003cstrong\u003eindustrial-grade components\u003c\/strong\u003e and \u003cstrong\u003edrop-in fit to the original APW17 mounting dimensions\u003c\/strong\u003e, so it swaps directly into the board with no PCB modification — the standard bench repair when the OEM inductor has failed.\u003c\/p\u003e\n\n\u003ch3\u003e5 Core Features\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat enamelled copper strip winding\u003c\/strong\u003e — stronger current-carrying capacity and lower DC internal resistance than a round-wire winding. Less heat generation under high-current operation, and lower risk of tripping the PSU's high-temperature protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToroidal low-loss magnetic core\u003c\/strong\u003e — excellent saturation characteristics under high-frequency PFC switching, prevents magnetic saturation at full load, keeps power factor stable across the miner's load range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil bottom reinforced with black epoxy resin\u003c\/strong\u003e — prevents the coil from fraying or detaching under the high-frequency vibration of a running mining rig chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide operating temperature: -40 °C to +125 °C\u003c\/strong\u003e — designed for the high-temperature environment inside a PSU running 24\/7 at full load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-developed for the APW17 PFC circuit\u003c\/strong\u003e — a core replacement component for APW17 PSU repair, not a generic industrial part retrofitted to fit.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eWhen to Replace the APW17 PFC Inductor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInductor overheating\u003c\/strong\u003e — visible discoloration around the coil, PSU throttling on temperature protection under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetic saturation\u003c\/strong\u003e — PSU output collapses under full miner load even though secondary-side components test fine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil burnout\u003c\/strong\u003e — open circuit on the winding, blackened epoxy, visible damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePSU won't start\u003c\/strong\u003e — no boost stage output, PFC front-end reports fault, miner cannot power on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreventive replacement during a full PSU rebuild\u003c\/strong\u003e — when other primary-side components (SiC MOSFETs, PFC controller) are already being swapped.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplication Scenarios\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepair and replacement of Antminer APW17 1215A \/ 1215B \/ 1215C PSUs\u003c\/strong\u003e — the primary use case, drop-in fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePFC circuit fault repair for S21, S21 Pro, S19jXP, KS5, KS5 Pro and L9 miner PSUs\u003c\/strong\u003e that use the APW17 platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePFC power factor correction circuits\u003c\/strong\u003e in industrial switching power supplies of comparable rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-current filtering and boost circuits\u003c\/strong\u003e in high-power AC-DC supplies where the 400 µH \/ 20 A footprint matches.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDisconnect mains and discharge the PSU capacitors before opening the enclosure\u003c\/strong\u003e — an APW17 carries lethal stored energy. Locate the failed inductor on the primary side of the PSU (in the PFC boost stage between the input rectifier and the main switching MOSFETs). Desolder the PCB pins carefully — the epoxy-potted base means the part sits firmly on the board, so use a proper desoldering pump or braid rather than yanking the housing. Clean the pads, drop in the new 400 µH \/ 20 A inductor with the pin orientation matching the original, and reflow. Verify no cold joints under magnification, close the PSU, and re-energise via a variac under progressive load — confirming the PFC stage boosts to spec and the main output holds under full miner load before returning the PSU to service.\u003c\/p\u003e\n\n\u003ch4\u003e400uH 20A Toroidal PFC Inductor 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;\"\u003eSpecifications\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;\"\u003eInductance\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003e400 µH ±20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eRated Temperature-Rise Current\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003e20 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eCore Structure\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eToroidal core, wound with flat copper enamelled wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eDC Resistance (DCR)\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eLow internal resistance — reduced heat loss under high current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003ePCB pin base, epoxy-reinforced potting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003e-40 °C to +125 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eCompatible PSU Models\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eAntminer APW17 1215A \/ 1215B \/ 1215C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eCompatible Miner Models\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eAntminer S21, S21 Pro, S21XP, S21++, S19jXP, KS5, KS5 Pro, L9, L11 (via APW17 PSU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003ePFC power factor correction circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eProcess Features\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eCoil reinforced with black epoxy — vibration-resistant, stable under harsh mining conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eFit\u003c\/td\u003e\n\u003ctd style=\"text-align:left;padding:6px 12px;\"\u003eMatches original APW17 mounting dimensions — direct replacement, no PCB modification\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;\"\u003eBrand new\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRelated Bitmain APW17 PSU Repair Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/es\/products\/uj4c075044k4s-750v-sic-mosfet-antminer-apw17\"\u003eUJ4C075044K4S 750V SiC MOSFET – APW17 (Sister PFC-Path Semi)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/es\/products\/nsi8100n-isolator-chip-bitmain-apw17-power-supply-unit\"\u003eNSi8100N Isolator Chip – APW17 PSU (Control-Loop Isolation)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/es\/products\/ltv-817c-optocoupler-isolator-5kv-bitmain-apw8-apw9-apw17-psu\"\u003eLTV-817C Optocoupler 5 kV – APW8 \/ APW9 \/ APW17 PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/es\/products\/p14-power-socket-connector-bitmain-antminer-apw17-psu\"\u003eP14 Power Socket Connector – APW17 PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eRepairing APW17 PSUs in volume or building out a bench spares kit? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for tray-quantity pricing on the 400 µH \/ 20 A toroidal PFC inductor and matched APW17 repair-kit bundles.\u003c\/p\u003e\n\u003cp\u003eWorldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":45948206940339,"sku":null,"price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/400uh-20a-toroidal-pfc-inductor-apw17-front.webp?v=1788481264","url":"https:\/\/lys-sz.com\/es\/products\/400uh-20a-toroidal-pfc-inductor-bitmain-apw17-psu-repair","provider":"LYS Shenzhen","version":"1.0","type":"link"}