{"product_id":"max809reur-microprocessor-monitoring-circuit-antminer-s19kpro","title":"MAX809REUR+T Microprocessor Monitoring Circuit for Antminer S19K Pro Control Board","description":"\u003ch2\u003eMAX809REUR+T Microprocessor Monitoring Circuit | Power Supply Watchdog for Antminer S19K Pro C76 Control Board\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMAX809REUR+T\u003c\/strong\u003e is a \u003cstrong\u003emicroprocessor supply-voltage monitoring circuit\u003c\/strong\u003e used on the \u003cstrong\u003eAntminer S19K Pro C76 A113D control board\u003c\/strong\u003e. Accurately monitors \u003cstrong\u003e+2.5V, +3V, +3.3V, and +5V supply rails\u003c\/strong\u003e, providing precise reset control and protection for the control board's main microprocessor. Requires no external components or adjustments — drop-in replacement when the original fails.\u003c\/p\u003e\n\u003cp\u003eWhen this chip fails or drifts out of spec, the control board can stay locked in reset state, repeatedly reboot on power-up, or fail to come up cleanly after a brief mains glitch. Common symptom: the control board sits with no LED activity even though all rails measure correctly with a multimeter — the watchdog never releases the microprocessor from reset.\u003c\/p\u003e\n\u003ch3\u003eWhen to Replace the MAX809REUR+T\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl board stuck in reset\u003c\/strong\u003e — main processor never starts, no boot activity despite healthy rails.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepeated reboots on power-up\u003c\/strong\u003e — watchdog tripping early.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailure to recover after brief mains glitch\u003c\/strong\u003e — POR pulse not generated correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible damage on the IC package\u003c\/strong\u003e after a fault event.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eMAX809REUR+T Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eMAX809REUR+T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMicroprocessor supply-voltage monitoring circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage Monitoring\u003c\/td\u003e\n\u003ctd\u003e+2.5V, +3V, +3.3V, +5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003eFully specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower-On Reset Pulse Width\u003c\/td\u003e\n\u003ctd\u003e140ms minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Current\u003c\/td\u003e\n\u003ctd\u003e12µA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Validity\u003c\/td\u003e\n\u003ctd\u003eUntil VCC = +1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Transient Immunity\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Components Required\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Control Board\u003c\/td\u003e\n\u003ctd\u003eAntminer S19K Pro C76 A113D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eFAQ — MAX809REUR+T Monitor IC\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm the MAX809REUR+T is the failed part?\u003c\/strong\u003e\u003cbr\u003eA: Measure the RESET pin output with the control board powered on. Healthy chip releases reset (pin goes high) within 140ms of all monitored rails reaching valid levels. Stuck-low reset pin with all rails confirmed healthy on a DMM = monitor chip failed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which Antminer models use this exact monitor variant?\u003c\/strong\u003e\u003cbr\u003eA: Confirmed for the S19K Pro C76 A113D control board. Other Antminer models may use the same chip family but different part-number variants (different reset thresholds). Match the silk marking on the failed chip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Rework profile?\u003c\/strong\u003e\u003cbr\u003eA: Small SOT-23-3 package — hot air at 320°C with flux paste, very short dwell. Easy to overheat the tiny package; preheat the board to 100°C first to reduce thermal shock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Bulk pricing?\u003c\/strong\u003e\u003cbr\u003eA: Yes — email contact@lys-sz.com for tape-and-reel quantities on MAX809REUR+T stock for S19K Pro control-board repair benches.\u003c\/p\u003e\n\u003ch3\u003eRelated products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-s21pro-control-board-a113d\"\u003eAntminer S21pro A113D Control Board\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-s21-control-board-amlogic-c76-a113d\"\u003eAntminer S21 \/ T21 Control Board Amlogic A113D Ctrl_C76\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/bitmain-cvitek-cv1835-control-board-c88-antminer-ks3-x5-s19\"\u003eBitmain CVITEK CV1835 C88 Control Board (KS3 \/ X5 \/ S19)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/fm24c02b-wire-serial-eeprom-cryptominer-repair\"\u003eFM24C02B EEPROM (Antminer S19j Pro+)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eS19K Pro control-board repair benches stocking MAX809REUR+T by the reel? Email \u003ca href=\"mailto:contact@lys-sz.com\"\u003econtact@lys-sz.com\u003c\/a\u003e for bulk pricing. Worldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":43046243696819,"sku":null,"price":0.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/MAX809REUR_T-Microprocessor-Monitoring-Circuit-Antminer-S19KPro.webp?v=1774223697","url":"https:\/\/lys-sz.com\/products\/max809reur-microprocessor-monitoring-circuit-antminer-s19kpro","provider":"LYS Shenzhen","version":"1.0","type":"link"}